{"id":21336,"date":"2026-10-08T13:30:26","date_gmt":"2026-10-08T05:30:26","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=21336"},"modified":"2026-10-08T13:30:26","modified_gmt":"2026-10-08T05:30:26","slug":"magnetic-particle-inspection-of-tool-steel","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/es\/magnetic-particle-inspection-of-tool-steel\/","title":{"rendered":"Inspecci\u00f3n por part\u00edculas magn\u00e9ticas del acero para herramientas"},"content":{"rendered":"\n<style>\n\n:root{\n    --aobo-accent:#2563eb; --aobo-accent-dark:#1e1e2e; --aobo-blue:#0c56d0; --aobo-blue-dark:#073b91;\n    --aobo-text:#333; --aobo-muted:#888; --aobo-border:#e5e7eb; --aobo-border-dark:#ddd;\n    --aobo-stripe:#f7f7f9; --aobo-hover:#e8f0fe; --aobo-radius:8px; --aobo-radius-sm:6px;\n    --aobo-orange:#f59e0b; --aobo-fill:#e9ecef;\n  }\n  *{box-sizing:border-box;}\n  html{-webkit-text-size-adjust:100%;}\n  body{margin:0;background:#fff;color:var(--aobo-text);\n    font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,\"Helvetica Neue\",Arial,sans-serif;\n    font-size:15px;line-height:1.6;}\n\n  \/* Root scope \u2014 WordPress theme guard *\/\n  .ts-props{color:var(--aobo-text);background:transparent;padding:0;box-sizing:border-box;line-height:1.6;}\n  .ts-props *{box-sizing:border-box;}\n  .ts-props button,.ts-props input[type=\"text\"]{\n    background:none !important;border:none !important;border-radius:0 !important;padding:0 !important;\n    margin:0 !important;font-size:inherit !important;font-weight:inherit !important;\n    letter-spacing:normal !important;text-transform:none !important;box-shadow:none !important;\n    line-height:inherit !important;text-decoration:none !important;}\n\n  .aobo-wrap{max-width:1160px;margin:0 auto;}\n\n  \/* Hero *\/\n  .ts-hero{background:#fff;border:1px solid var(--aobo-border);border-radius:var(--aobo-radius);overflow:hidden;}\n  .ts-hero-top{padding:1.5em;background:var(--aobo-stripe);border-bottom:1px solid var(--aobo-border);}\n  .ts-kicker{display:inline-flex;align-items:center;gap:6px;color:var(--aobo-accent);background:var(--aobo-hover);\n    border:1px solid var(--aobo-border);border-radius:var(--aobo-radius-sm);padding:4px 8px;\n    font-size:.85em;font-weight:600;margin-bottom:.8em;}\n  .ts-kicker span{width:6px;height:6px;background:var(--aobo-orange);border-radius:50%;display:inline-block;}\n  .ts-hero h1{margin:0;font-size:2rem;line-height:1.3;color:var(--aobo-text);text-align:center;}\n  .ts-hero-top p{margin:.6em auto 0;max-width:820px;font-size:.9em;line-height:1.6;color:var(--aobo-muted);text-align:center;}\n\n  \/* Tool area *\/\n  .ts-tool-area{padding:1.5em;}\n\n  \/* Legend *\/\n  .ts-legend{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:1em;}\n  .ts-legend > span{display:inline-flex;align-items:center;gap:5px;font-size:.8em;color:var(--aobo-muted);\n    background:var(--aobo-stripe);border:1px solid var(--aobo-border);border-radius:var(--aobo-radius-sm);\n    padding:3px 8px;}\n  .ts-legend b{color:var(--aobo-text);font-weight:600;}\n  .ts-legend .ts-dot{width:9px;height:9px;border-radius:50%;background:var(--aobo-accent);display:inline-block;\n    padding:0;border:0;gap:0;}\n\n  \/* Controls *\/\n  .ts-controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center;background:var(--aobo-stripe);\n    border:1px solid var(--aobo-border);border-radius:var(--aobo-radius);padding:1em;margin-bottom:1.2em;}\n  .ts-search{flex:1 1 220px;max-width:340px;position:relative;}\n  .ts-props .ts-search input{width:100% !important;border:1px solid var(--aobo-border-dark) !important;\n    border-radius:var(--aobo-radius-sm) !important;padding:.5em .6em .5em 2em !important;\n    font-size:.92em !important;color:var(--aobo-text) !important;background:#fff !important;\n    outline:none !important;box-shadow:none !important;}\n  .ts-props .ts-search input:focus{border-color:var(--aobo-accent) !important;\n    box-shadow:0 0 0 2px rgba(37,99,235,.12) !important;}\n  .ts-search::before{content:\"\";position:absolute;left:.7em;top:50%;transform:translateY(-50%);\n    width:13px;height:13px;background:var(--aobo-muted);\n    -webkit-mask:url(\"data:image\/svg+xml;utf8,<svg xmlns='http:\/\/www.w3.org\/2000\/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'><circle cx='11' cy='11' r='8'\/><path d='m21 21-4.3-4.3'\/><\/svg>\") center\/contain no-repeat;\n    mask:url(\"data:image\/svg+xml;utf8,<svg xmlns='http:\/\/www.w3.org\/2000\/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'><circle cx='11' cy='11' r='8'\/><path d='m21 21-4.3-4.3'\/><\/svg>\") center\/contain no-repeat;}\n  .ts-chips{display:flex;flex-wrap:wrap;gap:6px;}\n  .ts-props .ts-chip{border:1px solid var(--aobo-border-dark) !important;background:#fff !important;\n    color:var(--aobo-text) !important;border-radius:999px !important;padding:.4em .9em !important;\n    font-size:.8em !important;font-weight:600 !important;cursor:pointer !important;transition:all .15s !important;}\n  .ts-props .ts-chip:hover{background:var(--aobo-hover) !important;border-color:var(--aobo-accent) !important;}\n  .ts-props .ts-chip.on{background:var(--aobo-accent) !important;border-color:var(--aobo-accent) !important;color:#fff !important;}\n  .ts-count{font-size:.8em;color:var(--aobo-muted);margin-left:auto;white-space:nowrap;}\n\n  \/* Table *\/\n  .ts-table-wrap{overflow-x:auto;border:1px solid var(--aobo-border);border-radius:var(--aobo-radius);\n    background:#fff;box-shadow:0 1px 2px rgba(16,24,40,.04);}\n  table.ts-table{border-collapse:collapse;width:100%;min-width:880px;font-size:.88em;}\n  .ts-table thead th{position:sticky;top:0;z-index:2;background:var(--aobo-accent-dark);color:#fff;\n    border-bottom:0;border-right:1px solid rgba(255,255,255,.1);text-align:center;padding:.6em .7em;\n    font-size:.82em;font-weight:600;text-transform:none;letter-spacing:.02em;cursor:pointer;\n    white-space:nowrap;user-select:none;}\n  .ts-table thead th:last-child{border-right:0;}\n  .ts-table thead th .ts-arr{color:#ffd166;font-weight:700;margin-left:3px;}\n  .ts-table tbody td{padding:.55em .7em;border-bottom:1px solid var(--aobo-border);text-align:center;\n    vertical-align:middle;white-space:nowrap;}\n  .ts-table tbody tr:nth-child(even){background:var(--aobo-stripe);}\n  .ts-table tbody tr:hover{background:var(--aobo-hover);}\n  .ts-table tbody tr.ts-group td{background:#e8ecf1;font-weight:700;font-size:.78em;letter-spacing:.05em;\n    text-transform:uppercase;color:#3c4043;padding:.55em .7em;border-bottom:1px solid var(--aobo-border);\n    text-align:left;}\n  .ts-table tbody tr:not(.ts-group).ts-hide{display:none;}\n  td.ts-grade{font-weight:700;font-size:.95em;text-align:left;white-space:nowrap;color:var(--aobo-text);}\n  .ts-meter{display:inline-flex;align-items:center;gap:7px;}\n  .ts-meter i{display:inline-block;width:44px;height:6px;border-radius:3px;background:var(--aobo-fill);overflow:hidden;}\n  .ts-meter i b{display:block;height:100%;border-radius:3px;background:linear-gradient(90deg,#4d94ff,var(--aobo-accent));}\n  .ts-meter span{font-size:.9em;font-weight:600;min-width:14px;}\n  .ts-hr{font-variant-numeric:tabular-nums;font-weight:500;}\n  .ts-num{font-variant-numeric:tabular-nums;}\n  .ts-sup{font-size:9px;color:var(--aobo-accent);vertical-align:super;line-height:0;}\n\n  \/* Footnotes *\/\n  .ts-notes-list{margin:1.2em 0 0;background:#fff;border:1px solid var(--aobo-border);\n    border-left:3px solid var(--aobo-accent);border-radius:0 var(--aobo-radius) var(--aobo-radius) 0;\n    padding:1em 1.2em 1em 2.2em;font-size:.82em;color:var(--aobo-muted);line-height:1.7;}\n  .ts-notes-list li{margin-bottom:.3em;}\n  .ts-notes-list sup{color:var(--aobo-accent);font-size:10px;}\n\n  \/* Figure *\/\n  .ts-fig{margin:1.2em 0 0;background:#fff;border:1px solid var(--aobo-border);border-radius:var(--aobo-radius);padding:1em;}\n  .ts-fig img{display:block;width:100%;height:auto;border-radius:6px;}\n  .ts-fig figcaption{font-size:.8em;color:var(--aobo-muted);margin-top:.6em;line-height:1.6;}\n  .ts-fig figcaption b{color:var(--aobo-text);}\n\n  \/* Info cards *\/\n  .ts-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px;margin-top:1.2em;}\n  .ts-grid .ts-card{background:#fff;border:1px solid var(--aobo-border);border-left:3px solid var(--aobo-accent);\n    border-radius:0 var(--aobo-radius) var(--aobo-radius) 0;padding:1em 1.2em;}\n  .ts-grid h2{font-size:1em;margin:0 0 .4em;color:var(--aobo-text);}\n  .ts-grid p{font-size:.82em;color:var(--aobo-muted);margin:0;line-height:1.7;}\n  .ts-grid p b{color:var(--aobo-text);font-weight:600;}\n\n  \/* Disclaimer *\/\n  .ts-disclaimer{margin-top:1.2em;background:#fff;border:1px solid var(--aobo-border);\n    border-left:3px solid var(--aobo-accent);border-radius:0 var(--aobo-radius) var(--aobo-radius) 0;\n    padding:1em 1.2em;}\n  .ts-disclaimer h3{margin:0 0 .5em;font-size:.95em;color:var(--aobo-text);display:flex;align-items:center;gap:6px;}\n  .ts-disclaimer h3::before{content:\"\\2139\";font-size:1em;color:var(--aobo-accent);}\n  .ts-disclaimer p{margin:0 0 .5em;max-width:none;color:var(--aobo-muted);line-height:1.7;}\n  .ts-disclaimer p:last-child{margin-bottom:0;}\n\n  \/* Empty \/ source *\/\n  .ts-empty{display:none;text-align:center;color:var(--aobo-muted);padding:2em 1em;font-size:.9em;}\n  .ts-empty.show{display:block;}\n  .ts-source{margin-top:.8em;color:var(--aobo-muted);font-size:.82em;line-height:1.58;}\n\n  @media (max-width:860px){\n    .ts-hero-top,.ts-tool-area{padding:1em;}\n    .ts-controls{flex-direction:column;align-items:stretch;}\n    .ts-search{max-width:none;}\n    .ts-count{margin-left:0;}\n    .ts-hero h1{font-size:1.5rem;}\n  }\n  @media (max-width:520px){\n    .ts-hero-top,.ts-tool-area{padding:.8em;}\n    table.ts-table{font-size:.82em;}\n    .ts-table thead th,.ts-table tbody td{padding:.4em .4em;}\n  }\n  table.ts-table thead th{cursor:default;}\n  table.ts-table td.ts-grade{font-weight:700;}\n  table.ts-table td.ts-type{white-space:normal;text-align:left;font-size:.92em;color:#555;min-width:150px;}\n  table.ts-table td.ts-long{white-space:normal;text-align:left;vertical-align:top;font-size:.92em;color:#444;\n    min-width:260px;line-height:1.55;}\n  table.ts-table td.ts-safe{white-space:normal;text-align:left;vertical-align:top;}\n  table.ts-table tbody tr:hover{background:var(--aobo-hover);}\n  table.ts-table tbody tr.ts-group:hover td{background:#e8ecf1;}\n  .ts-sec{margin:1.8em 0 .5em;font-size:1.02em;color:var(--aobo-text);font-weight:700;}\n  .ts-sec span{display:block;font-size:.8em;font-weight:400;color:var(--aobo-muted);margin-top:.15em;line-height:1.6;}\n  .ts-table-wrap{margin-top:.6em;}\n  .ts-tcap{margin:.5em 0 0;font-size:.78em;color:var(--aobo-muted);line-height:1.6;}\n  .ts-props a{color:var(--aobo-blue) !important;text-decoration:none !important;}\n  .ts-props a:hover{text-decoration:underline !important;}\n  .ts-rel{margin-top:1.2em;background:#fff;border:1px solid var(--aobo-border);\n    border-left:3px solid var(--aobo-blue);border-radius:0 var(--aobo-radius) var(--aobo-radius) 0;padding:1em 1.2em;}\n  .ts-rel h3{margin:0 0 .5em;font-size:.95em;color:var(--aobo-text);}\n  .ts-rel p{margin:0;font-size:.85em;line-height:1.9;color:var(--aobo-muted);}\n  .ts-rel p a{font-weight:600;}\n\n  .aobo-ht-ref.ts-props table.ts-table.wraphead thead th{white-space:normal;line-height:1.25;}\n  .aobo-ht-ref.ts-props table.ts-table.wraphead tbody td{white-space:nowrap !important;}\n<\/style>\n\n<style id=\"aobo-dl-css\">\n.aobo-ht-ref.ts-props .ts-dl{display:flex !important;flex-wrap:wrap;align-items:center;gap:1em;\n  background:var(--aobo-stripe) !important;border:1px solid var(--aobo-border) !important;\n  border-radius:var(--aobo-radius) !important;padding:1.1em 1.3em !important;margin:1.5em 0 !important;}\n.aobo-ht-ref.ts-props .ts-dl-txt{flex:1 1 340px;font-size:.95em;color:var(--aobo-text) !important;line-height:1.55;}\n.aobo-ht-ref.ts-props .ts-dl-txt strong{display:block;font-weight:700 !important;margin-bottom:.2em;color:var(--aobo-text) !important;}\n.aobo-ht-ref.ts-props a.ts-dl-btn{display:inline-flex !important;align-items:center;gap:.5em;\n  background:var(--aobo-blue) !important;color:#fff !important;border:1px solid var(--aobo-blue) !important;\n  border-radius:var(--aobo-radius-sm) !important;padding:.75em 1.35em !important;font-size:.95em !important;\n  font-weight:600 !important;text-decoration:none !important;white-space:nowrap;box-shadow:none !important;\n  line-height:1.3 !important;text-transform:none !important;}\n.aobo-ht-ref.ts-props a.ts-dl-btn:hover,.aobo-ht-ref.ts-props a.ts-dl-btn:focus{background:var(--aobo-blue-dark) !important;\n  border-color:var(--aobo-blue-dark) !important;color:#fff !important;}\n.aobo-ht-ref.ts-props a.ts-dl-btn svg{width:1.05em;height:1.05em;fill:none;stroke:currentColor;stroke-width:2;flex:0 0 auto;}\n@media (max-width:640px){.aobo-ht-ref.ts-props a.ts-dl-btn{width:100%;justify-content:center;}}\n<\/style>\n\n<style id=\"aobo-ds\">\n.entry-content[class]{--ds-font-body: Lora,serif;--ds-font-head: Lato,sans-serif;--ds-blue: #0c56d0;--ds-blue-deep: #082d6f;--ds-blue-dark: #073b91;--ds-blue-soft: #eaf2ff;--ds-blue-pale: #f7fbff;--ds-border: #d7e5fb;--ds-border-soft: #e8eef8;--ds-text: #203044;--ds-muted: #617087;--ds-orange: #f59b23;--ds-shadow: 0 18px 45px rgba(12,86,208,0.10);--ds-shadow-sm: 0 12px 32px rgba(12,86,208,0.07);font-family: var(--ds-font-body);line-height: 1.7;-webkit-text-size-adjust: 100%;box-sizing: border-box}.entry-content[class] *,.entry-content[class] *::before,.entry-content[class] *::after{box-sizing: border-box}.entry-content[class] h1{font-family: var(--ds-font-head) !important;font-size: clamp(24px,4vw,min(50px,var(--h1-max,50px))) !important;line-height: 1.08 !important;letter-spacing: 0 !important;font-weight: 400 !important;margin: 0 0 16px !important}.entry-content[class] h2{font-family: var(--ds-font-head) !important;font-size: 30px !important;line-height: 1.25 !important;letter-spacing: 0 !important;font-weight: 400 !important;margin: 44px 0 16px !important}.entry-content[class] h3{font-family: var(--ds-font-head) !important;font-size: 23px !important;line-height: 1.3 !important;letter-spacing: 0 !important;font-weight: 400 !important;margin: 30px 0 12px !important}.entry-content[class] h4{font-family: var(--ds-font-head) !important;font-size: 19px !important;line-height: 1.35 !important;letter-spacing: 0 !important;font-weight: 700 !important;margin: 24px 0 10px !important}.entry-content[class] p,.entry-content[class] li,.entry-content[class] dd,.entry-content[class] dt{font-family: var(--ds-font-body) !important;font-size: 17px !important;line-height: 1.7 !important}.entry-content[class] figcaption,.entry-content[class] small,.entry-content[class] .aobo-figure figcaption{font-size: 15px !important;line-height: 1.6 !important}.entry-content[class] table{width: 100%;border-collapse: collapse;background: #ffffff}.entry-content[class] table th,.entry-content[class] table thead th,.entry-content[class] table thead td{background: var(--ds-blue-soft) !important;color: var(--ds-blue-deep) !important;font-family: var(--ds-font-head) !important;font-size: 15px !important;font-weight: 700 !important;line-height: 1.45 !important;text-align: center !important;text-transform: none !important;letter-spacing: 0 !important;padding: 14px 16px !important;border: 0 !important;border-bottom: 1px solid var(--ds-border) !important;vertical-align: top !important;position: static !important}.entry-content[class] table td{font-family: var(--ds-font-body) !important;font-size: 15px !important;line-height: 1.55 !important;padding: 14px 16px !important;border: 0;border-bottom: 1px solid var(--ds-border-soft) !important;vertical-align: top !important;white-space: normal !important;text-align: center !important}.entry-content[class] table tbody tr:last-child td{border-bottom: 0 !important}.entry-content[class] table th.ds-text,.entry-content[class] table td.ds-text{text-align: left !important}.entry-content[class] table tbody tr:nth-child(even){background: #fafcff !important}.entry-content[class] table tbody tr:hover{background: #f2f7ff !important}.entry-content[class] table tbody td:first-child{color: var(--ds-blue-deep);font-weight: 700}.entry-content[class] .aobo-table-wrap,.entry-content[class] .ts-table-wrap{overflow-x: auto;margin: 22px 0 28px;border: 1px solid var(--ds-border);border-radius: 18px;box-shadow: var(--ds-shadow-sm);background: #ffffff}.entry-content[class] h1,.entry-content[class] h2,.entry-content[class] h3,.entry-content[class] h4{color: var(--ds-blue-deep)}.entry-content[class] p,.entry-content[class] li{color: var(--ds-text)}.entry-content[class] a{color: var(--ds-blue);font-weight: 700;text-decoration: none}.entry-content[class] a:hover,.entry-content[class] a:focus{color: var(--ds-orange)}.entry-content[class] .aobo-final-cta h1,.entry-content[class] .aobo-final-cta h2,.entry-content[class] .aobo-final-cta h3,.entry-content[class] .aobo-final-cta p,.entry-content[class] .aobo-cta h1,.entry-content[class] .aobo-cta h2,.entry-content[class] .aobo-cta h3,.entry-content[class] .aobo-cta p,.entry-content[class] .aobo-cta-buttons,.entry-content[class] .aobo-cta-buttons *,.entry-content[class] .aobo-esr .stat-band h2,.entry-content[class] .aobo-esr .stat-band h3,.entry-content[class] .aobo-esr .stat-band p,.entry-content[class] .aobo-esr .closing h2,.entry-content[class] .aobo-esr .closing h3,.entry-content[class] .aobo-esr .closing p,.entry-content[class] .footcta h2,.entry-content[class] .footcta h3,.entry-content[class] .footcta p,.entry-content[class] .bg-dark h2,.entry-content[class] .bg-dark h3,.entry-content[class] .bg-dark p,.entry-content[class] .ht-header h2,.entry-content[class] .ht-header h3,.entry-content[class] .ts-cta h2,.entry-content[class] .ts-cta h3,.entry-content[class] .aobo-sup .stats h2,.entry-content[class] .aobo-sup .stats h3,.entry-content[class] .aobo-sup .stats p,.entry-content[class] .aobo-sup .cta h2,.entry-content[class] .aobo-sup .cta h3,.entry-content[class] .aobo-sup .cta p{color: inherit}.entry-content[class] .aobo-final-cta p,.entry-content[class] .aobo-cta p,.entry-content[class] .aobo-sup .cta p{color: rgba(255,255,255,0.92)}.entry-content[class] .has-ast-global-color-0-background-color,.entry-content[class] .has-ast-global-color-0-background-color *,.entry-content[class] .contact-container,.entry-content[class] .contact-container *{color: #ffffff !important}.entry-content[class] .has-ast-global-color-0-background-color .label-text,.entry-content[class] .has-ast-global-color-0-background-color .label-text *,.entry-content[class] .contact-container .label-text{color: rgba(255,255,255,0.72) !important}.entry-content[class] .aobo-cta h1,.entry-content[class] .aobo-cta h2,.entry-content[class] .aobo-cta h3,.entry-content[class] .aobo-cta h4,.entry-content[class] .cta h1,.entry-content[class] .cta h2,.entry-content[class] .cta h3,.entry-content[class] .cta h4,.entry-content[class] .aobo-final-cta h1,.entry-content[class] .aobo-final-cta h2,.entry-content[class] .aobo-final-cta h3,.entry-content[class] .aobo-final-cta h4{color: #ffffff !important}.entry-content[class] .aobo-cta p,.entry-content[class] .aobo-cta li,.entry-content[class] .cta p,.entry-content[class] .cta li,.entry-content[class] .aobo-final-cta p,.entry-content[class] .aobo-final-cta li{color: rgba(255,255,255,0.93) !important}.entry-content[class] .aobo-cta p a,.entry-content[class] .aobo-cta li a,.entry-content[class] .cta p a,.entry-content[class] .cta li a,.entry-content[class] .aobo-final-cta p a,.entry-content[class] .aobo-final-cta li a{color: #ffffff !important;text-decoration: underline}.entry-content[class] .aobo-btn-inquiry{color: #ffffff !important}.entry-content[class] .aobo-cta .aobo-btn-inquiry,.entry-content[class] .aobo-final-cta .aobo-btn-inquiry{color: var(--ds-blue) !important}.entry-content[class] .aobo-wrap,.entry-content[class] .aobo-article{max-width: 1180px;margin: 0 auto;padding: 0}.entry-content[class] img{max-width: 100%;height: auto}.entry-content[class] figure{margin: 26px auto 34px;max-width: 860px}.entry-content[class] figure img{display: block;width: 100%;border: 1px solid var(--ds-border);border-radius: 18px;box-shadow: var(--ds-shadow-sm);background: #ffffff}.entry-content[class] .aobo-hero{background: linear-gradient(135deg,#ffffff 0%,#f7fbff 56%,#eaf2ff 100%);border: 1px solid var(--ds-border);border-radius: 28px;padding: 42px 38px;margin-bottom: 24px;box-shadow: var(--ds-shadow);overflow: hidden;position: relative}.entry-content[class] .aobo-hero::after{content: \"\";position: absolute;right: -90px;top: -90px;width: 260px;height: 260px;border-radius: 50%;background: rgba(12,86,208,0.08)}.entry-content[class] .aobo-hero h1,.entry-content[class] .aobo-hero p{position: relative;z-index: 2}.entry-content[class] .aobo-note-box{margin: 34px 0;padding: 22px 24px;border: 1px solid var(--ds-border);border-left: 5px solid var(--ds-orange);border-radius: 16px;background: #fbfdff}.entry-content[class] .aobo-note-box p{margin: 0 0 14px;color: var(--ds-muted) !important;font-style: italic}.entry-content[class] .aobo-note-box p:last-child{margin-bottom: 0}.entry-content[class] .aobo-btn{display: inline-flex;align-items: center;justify-content: center;min-height: 42px;padding: 10px 16px;border-radius: 999px;text-align: center;text-decoration: none;font-family: var(--ds-font-head) !important;font-weight: 700;font-size: 14px !important;line-height: 1.2;transition: all 0.2s ease;cursor: pointer;white-space: nowrap}.entry-content[class] .aobo-btn-primary{background: var(--ds-blue);border: 1px solid var(--ds-blue);color: #ffffff !important}.entry-content[class] .aobo-btn-secondary{background: #ffffff;border: 1px solid var(--ds-border);color: var(--ds-blue) !important}.entry-content[class] .aobo-btn:hover{transform: translateY(-1px)}.entry-content[class] .aobo-supply-actions{display: flex;flex-wrap: wrap;gap: 12px;margin-top: 18px}.entry-content[class] .aobo-supply-actions .aobo-btn{min-width: 190px}.entry-content[class] .aobo-final-cta{margin-top: 34px;padding: 34px;border-radius: 28px;background: linear-gradient(135deg,#073b91 0%,#0c56d0 100%);box-shadow: 0 18px 45px rgba(12,86,208,0.20);display: flex;align-items: center;justify-content: space-between;gap: 20px;flex-wrap: wrap}.entry-content[class] .aobo-final-cta h2{margin: 0 0 12px !important;font-size: 26px !important;color: #ffffff !important}.entry-content[class] .aobo-final-cta p{margin: 0}.entry-content[class] .aobo-final-cta .aobo-btn-primary{background: #ffffff;border-color: #ffffff;color: var(--ds-blue) !important}.entry-content[class] .aobo-final-cta .aobo-btn-secondary{background: transparent;border-color: rgba(255,255,255,0.75);color: #ffffff !important}.entry-content[class] .ts-hero{background: transparent !important;border: 0 !important;border-radius: 0 !important;box-shadow: none !important}.entry-content[class] .ts-hero-top{background: linear-gradient(135deg,#ffffff 0%,#f7fbff 56%,#eaf2ff 100%) !important;border: 1px solid var(--ds-border) !important;border-radius: 28px !important;padding: 42px 38px !important;margin: 0 0 24px !important;box-shadow: var(--ds-shadow) !important;position: relative;overflow: hidden;text-align: left !important}.entry-content[class] .ts-hero-top h1,.entry-content[class] .ts-hero-top p,.entry-content[class] .ts-hero h1{text-align: left !important}.entry-content[class] .ts-hero-top p{max-width: none !important;margin: 0 0 12px !important}.entry-content[class] .ts-tool-area{padding: 0 !important}.entry-content[class] .ts-sec{font-family: var(--ds-font-head) !important;font-size: 30px !important;line-height: 1.25 !important;font-weight: 400 !important;color: var(--ds-blue-deep) !important;margin: 44px 0 16px !important}.entry-content[class] .ts-sec > span{display: block !important;font-family: var(--ds-font-body) !important;font-size: 17px !important;line-height: 1.7 !important;font-weight: 400 !important;color: var(--ds-text) !important;margin: 0 0 16px !important}.entry-content[class] .ts-kicker{display: inline-flex !important;align-items: center;gap: 7px;margin: 0 0 14px !important;padding: 6px 14px !important;border: 1px solid var(--ds-border) !important;border-radius: 999px !important;background: #ffffff !important;color: var(--ds-blue) !important;font-family: var(--ds-font-head) !important;font-size: 13px !important;font-weight: 700 !important;letter-spacing: 0 !important;text-transform: none !important}.entry-content[class] .ts-p,.entry-content[class] .card-desc,.entry-content[class] .aobo-strip-intro,.entry-content[class] .schema-faq-answer{font-family: var(--ds-font-body) !important;font-size: 17px !important;line-height: 1.7 !important;font-weight: 400 !important}.entry-content[class] .lead,.entry-content[class] .fund-lead{font-family: var(--ds-font-body) !important;font-size: 19px !important;line-height: 1.65 !important;font-weight: 400 !important}.entry-content[class] .ts-h2{font-family: var(--ds-font-head) !important;font-size: 30px !important;line-height: 1.25 !important;font-weight: 400 !important;color: var(--ds-blue-deep) !important;margin: 44px 0 16px !important}.entry-content[class] .ts-h3{font-family: var(--ds-font-head) !important;font-size: 23px !important;line-height: 1.3 !important;font-weight: 400 !important;color: var(--ds-blue-deep) !important;margin: 30px 0 12px !important}.entry-content[class] .card-grade{font-family: var(--ds-font-head) !important;font-size: 23px !important;line-height: 1.25 !important;font-weight: 700 !important}.entry-content[class] .schema-faq-question{font-family: var(--ds-font-head) !important;font-size: 19px !important;line-height: 1.4 !important;font-weight: 700 !important;color: var(--ds-blue-deep) !important}.entry-content[class] .ts-source,.entry-content[class] .ts-hint,.entry-content[class] .ts-placeholder,.entry-content[class] .ht-spec-label,.entry-content[class] .ht-spec-value,.entry-content[class] .ht-step-indicator,.entry-content[class] .ht-badge,.entry-content[class] .idx,.entry-content[class] .xlink,.entry-content[class] .cat-note,.entry-content[class] .aobo-card-note,.entry-content[class] .card-desig,.entry-content[class] .k,.entry-content[class] .v,.entry-content[class] .note,.entry-content[class] .aobo-note{font-family: var(--ds-font-head) !important;font-size: 15px !important;line-height: 1.6 !important;font-weight: 400 !important}.entry-content[class] .ht-spec-label,.entry-content[class] .idx,.entry-content[class] .k{font-weight: 700 !important}.entry-content[class] .aobo-note,.entry-content[class] .note{font-family: var(--ds-font-body) !important;color: var(--ds-muted) !important}.entry-content[class] .chip{font-family: var(--ds-font-head) !important;font-size: 13px !important;font-weight: 700 !important}.entry-content[class] .kicker,.entry-content[class] .eyebrow,.entry-content[class] .aobo-eyebrow{display: inline-flex !important;align-items: center;gap: 7px;margin: 0 0 14px !important;padding: 6px 14px !important;border: 1px solid var(--ds-border) !important;border-radius: 999px !important;background: #ffffff !important;color: var(--ds-blue) !important;font-family: var(--ds-font-head) !important;font-size: 13px !important;font-weight: 700 !important;letter-spacing: 0 !important;text-transform: none !important}@media (max-width: 760px){.entry-content[class] h1{font-size: clamp(22px,6.4vw,min(34px,var(--h1-max,34px))) !important}.entry-content[class] h2{font-size: 25px !important}.entry-content[class] h3{font-size: 20px !important}.entry-content[class] h4{font-size: 17px !important}.entry-content[class] p,.entry-content[class] li{font-size: 16px !important}.entry-content[class] table th,.entry-content[class] table td{font-size: 14px !important;padding: 11px 12px !important}.entry-content[class] .aobo-hero{padding: 30px 22px}.entry-content[class] .aobo-final-cta{padding: 26px 22px}.entry-content[class] .aobo-final-cta .aobo-btn{width: 100%}}\n<\/style>\n<section class=\"aobo-ht-ref ts-props\">\n<div class=\"aobo-wrap\">\n\n<div class=\"ts-hero\">\n<div class=\"ts-hero-top\">\n<div class=\"ts-kicker\"><span><\/span>Tool Steel | Magnetic Particle | Surface Cracks<\/div>\n<h1 style=\"--h1-max:38px\">Magnetic Particle Inspection of Tool Steel<\/h1>\n<p>A cracked die, a cracked insert or a cracked bar usually fails at a surface that no chemical test can reach and no radiograph resolves. Magnetic particle inspection is the method that finds those cracks, and it is the one inspection a tool steel user is most likely to witness at a supplier. This page sets out what the method finds, how deep it reaches, and the current levels that the published tool steel test showed are needed to get there.<\/p>\n<\/div>\n<\/div>\n\n<div class=\"ts-tool-area\">\n\n<h2 class=\"ts-h2\">What it finds, and how far it reaches<\/h2>\n<p class=\"ts-p\">The method magnetizes the part and lets a discontinuity leak flux at the surface, where iron powder settles onto the leak and outlines it. The largest and most important group of discontinuities is the one exposed to the surface, and surface cracks matter most because they do more harm to service life than a buried flaw of the same size. On tool steel the method locates seams, laps, quenching cracks and grinding cracks, and it detects fatigue cracks that open up in service.<\/p>\n<p class=\"ts-p\">A discontinuity is easiest to find when the field runs across it rather than along it, when its depth runs at right angles to the surface, when its opening at the surface is narrow, and when its length is large against its width. Many incipient fatigue cracks and fine grinding cracks are less than 0.025 mm deep with surface openings of perhaps a tenth of that, and those are readily found by the wet method. As a general rule a surface discontinuity whose depth is at least five times its opening at the surface will be detectable, and the gain from a deeper crack fades beyond about 6.4 mm.<\/p>\n<p class=\"ts-p\">Two features of real cracks work against the method and are worth knowing when a report comes back clean. A crack whose faces are pressed together by compressive stress leaves almost no air gap, so it leaks almost no flux and can produce no indication at all, which is common in shallow cracks left by grinding or heat treating. A forging or rolling lap that emerges at an acute angle also leaks weakly, and laps of that kind call for high sensitivity, usually direct current magnetizing with wet fluorescent particles.<\/p>\n\n<h2 class=\"ts-h2\">Wet particles for cracks, dry particles for rough and buried flaws<\/h2>\n<p class=\"ts-p\">Wet particles are the choice for fine discontinuities such as fatigue cracks, and dry particles are the choice for very rough surfaces and for flaws below the surface, where they are usually applied with portable equipment and carried in an air stream. Colour is a practical matter rather than a technical one. Black stands out on light surfaces, red on bright polished surfaces, and fluorescent particles under ultraviolet light give the highest contrast of all.<\/p>\n<p class=\"ts-p\">The fluorescent route has its own numbers. The peak of the useful black light band sits at about 365 nm, and the light at that wavelength is not the harmful short wave ultraviolet that damages skin and eyes. For aircraft-quality fluorescent inspection the minimum intensity at the workpiece surface is 1000 microwatts per square centimetre, and a high-intensity 125 W bulb reaches up to 5000 microwatts per square centimetre at 380 mm. Bath strength matters as much as the lamp, since a weak bath can miss a fine indication entirely and a heavy one buries it in background, and the settling test on 100 mL of agitated bath is the usual way to hold it steady.<\/p>\n\n<h2 class=\"ts-h2\">Alternating current stops at the surface<\/h2>\n<p class=\"ts-p\">Alternating current at 50 or 60 Hz is confined near the surface by the skin effect, so it detects discontinuities that are open to the surface or only a few thousandths of an inch below it. At lower frequencies the skin effect weakens and the lines of force reach deeper. Direct current magnetizes the whole cross section more uniformly, with a straight-line gradient from a maximum at the surface to zero at the centre under circular magnetization. In practice direct current is used on finished parts such as machined and ground shafts, cams and gears, while alternating current is used for fine cracks that actually break the surface and direct current is better for very fine nonmetallic stringers lying just below it.<\/p>\n<p class=\"ts-p\">One further consequence of alternating current is easy to overlook when reading a current setting. The strength of magnetization follows the peak of the sine wave, which is 1.41 times the value shown on an alternating current meter, so an alternating current meter reading is not directly comparable with a direct current one.<\/p>\n\n<h2 class=\"ts-h2\">The tool steel test that set the depth limit<\/h2>\n<p class=\"ts-p\">The clearest published measurement of how deep the method reaches was made on tool steel itself. A ring of unhardened O1 tool steel holding 0.40 percent carbon was made 127 mm outside diameter, 32 mm inside diameter and 22 mm thick, and twelve holes 1.8 mm in diameter were drilled through it parallel to the cylindrical surface at increasing depths below that surface. The centreline depths of the holes ran from 1.8 to 21.3 mm in steps of 1.8 mm. A central conductor, dry particles and continuous magnetization were used, and the current was raised until each hole gave a readable indication.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:38%\">Drilled hole and depth below the surface<\/th>\n<th style=\"width:30%\">Current type<\/th>\n<th>Current needed<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-grade\">Hole 1, 1.8 mm (0.07 in.)<\/td><td class=\"ts-num\">60 Hz alternating current<\/td><td class=\"ts-num\">about 475 A<\/td><\/tr>\n<tr><td class=\"ts-grade\">Hole 2, 3.56 mm (0.14 in.)<\/td><td class=\"ts-num\">60 Hz alternating current<\/td><td class=\"ts-num\">over 1000 A<\/td><\/tr>\n<tr><td class=\"ts-grade\">Hole 2, 3.56 mm (0.14 in.)<\/td><td class=\"ts-num\">Straight direct current<\/td><td class=\"ts-num\">450 A<\/td><\/tr>\n<tr><td class=\"ts-grade\">Hole 2, 3.56 mm (0.14 in.)<\/td><td class=\"ts-num\">Direct current with a surge<\/td><td class=\"ts-num\">320 A<\/td><\/tr>\n<tr><td class=\"ts-grade\">Hole 2, 3.56 mm (0.14 in.)<\/td><td class=\"ts-num\">Half-wave direct current<\/td><td class=\"ts-num\">250 A<\/td><\/tr>\n<tr><td class=\"ts-grade\">Hole 3, 5.33 mm (0.21 in.)<\/td><td class=\"ts-num\">60 Hz alternating current<\/td><td class=\"ts-num\">not reachable at any available level<\/td><\/tr>\n<tr><td class=\"ts-grade\">Hole 10, 17.8 mm (0.70 in.)<\/td><td class=\"ts-num\">Straight direct current<\/td><td class=\"ts-num\">975 A<\/td><\/tr>\n<tr><td class=\"ts-grade\">Hole 12, 21.3 mm (0.84 in.)<\/td><td class=\"ts-num\">Half-wave direct current<\/td><td class=\"ts-num\">750 A<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>Threshold currents at which drilled holes in an O1 tool steel ring gave readable magnetic particle indications, with dry particles, a central conductor and continuous magnetization, reproduced from Magnetic Particle Inspection in ASM Handbook, Volume 17. The alternating current column is the one to read first, because it shows the method failing at a depth of 5.33 mm no matter how much current is applied. With wet particles the levels are higher again, and the source gives about 440 A of direct current for hole 1 and about 910 A for hole 3.<\/em><\/p>\n<p class=\"ts-p\">The same ring was hardened to 63 HRC and the test repeated, and the cost of that hardness is visible in the current levels. Raising the current does not recover the deep holes, since the limit is set by the current type rather than by the amperage.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:34%\">Drilled hole and depth below the surface<\/th>\n<th style=\"width:22%\">Half-wave direct current<\/th>\n<th style=\"width:22%\">Direct current with a surge<\/th>\n<th>Straight direct current<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-grade\">Hole 1, 1.8 mm (0.07 in.)<\/td><td class=\"ts-num\">about 200 A<\/td><td class=\"ts-num\">about 300 A<\/td><td class=\"ts-num\">about 450 A<\/td><\/tr>\n<tr><td class=\"ts-grade\">Hole 3, 5.33 mm (0.21 in.)<\/td><td class=\"ts-num\">about 1300 A<\/td><td class=\"ts-num\">about 1875 A<\/td><td class=\"ts-num\">about 2700 A<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>Current needed to indicate two depths of drilled hole in the same O1 tool steel ring after hardening to 63 HRC, reproduced from Magnetic Particle Inspection in ASM Handbook, Volume 17. A hard part needs more current still than an annealed one, and at hole 3 the straight direct current figure is about 2700 A.<\/em><\/p>\n\n<h2 class=\"ts-h2\">How the part is magnetized<\/h2>\n<p class=\"ts-p\">The current has to be passed in a direction parallel to the discontinuity, so that the field it sets up runs across the crack. A current sent down the length of the part gives a circumferential field that finds longitudinal flaws, and a coil or solenoid around the part gives a longitudinal field that finds transverse flaws. Where the direction of the flaw is not known, both magnetization directions have to be used in turn, and the prods or yoke are repositioned at 90 degrees between the two shots. The published methods and their boundaries are as follows.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:16%\">Magnetization method<\/th>\n<th style=\"width:26%\">Where it is used<\/th>\n<th style=\"width:28%\">Advantages<\/th>\n<th>Limitations<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-grade\">Coils, single or multiple loop<\/td><td class=\"ts-safe\">Medium-size parts whose length predominates, such as a shaft or a crankshaft, and large castings, forgings or shafts<\/td><td class=\"ts-safe\">A longitudinal field over the whole surface, or easily wrapped with a flexible cable<\/td><td class=\"ts-safe\">The part should be centred in the coil, length may need more than one shot, and sensitivity falls at the ends<\/td><\/tr>\n<tr><td class=\"ts-grade\">Yokes<\/td><td class=\"ts-safe\">Large surface areas, and localized areas on miscellaneous parts<\/td><td class=\"ts-safe\">No electrical contact, highly portable, finds a discontinuity in any direction with the yoke turned across it<\/td><td class=\"ts-safe\">Time consuming, the yoke has to be repositioned systematically, and sensitivity to subsurface flaws is poor<\/td><\/tr>\n<tr><td class=\"ts-grade\">Central conductors<\/td><td class=\"ts-safe\">Short parts with a hole, such as rings, hollow cylinders, gears and couplings, and long tubular parts<\/td><td class=\"ts-safe\">No electrical contact so no risk of burning, a circumferential field on every surface around the conductor<\/td><td class=\"ts-safe\">The conductor must be central and large enough to carry the current, and large parts need several setups<\/td><\/tr>\n<tr><td class=\"ts-grade\">Direct contact, head shot<\/td><td class=\"ts-safe\">Solid, relatively small cast, forged or machined parts on a horizontal wet-method unit<\/td><td class=\"ts-safe\">Fast, easy, a complete circular field around the current path and good sensitivity to surface and near-surface flaws<\/td><td class=\"ts-safe\">Burning is possible if contact is poor, and long parts are inspected in sections<\/td><\/tr>\n<tr><td class=\"ts-grade\">Direct contact, clamps and cables<\/td><td class=\"ts-safe\">Large castings and forgings, long tubular parts and long solid parts such as billets, bars and shafts<\/td><td class=\"ts-safe\">The whole length is circularly magnetized end to end and the amperage is independent of length<\/td><td class=\"ts-safe\">High amperage, 8000 to 20 000 A, needs a special power pack, and the ends must carry the current<\/td><\/tr>\n<tr><td class=\"ts-grade\">Prod contacts<\/td><td class=\"ts-safe\">Welds, for cracks, inclusions, open roots or incomplete penetration, and large castings or forgings<\/td><td class=\"ts-safe\">The circular field can be aimed at the weld, and with half-wave current and dry powder subsurface sensitivity is excellent<\/td><td class=\"ts-safe\">Only a small area per shot, arc burn from poor contact, and large areas take many shots<\/td><\/tr>\n<tr><td class=\"ts-grade\">Induced current<\/td><td class=\"ts-num\">Ring-shaped parts, balls, disks and gears<\/td><td class=\"ts-safe\">No electrical contact, full coverage in one magnetization, and the process can be automated<\/td><td class=\"ts-safe\">A laminated core is needed through the ring, and the current type must suit the magnetic hardness of the metal<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>General applications, advantages and limitations of the ways a part is magnetized for magnetic particle inspection, condensed from Table 1 of Magnetic Particle Inspection in ASM Handbook, Volume 17. On a long solid part such as a bar or a billet, contacting the ends circularly magnetizes the whole length at once, and on a coil the part should be centred so that the length effectively magnetized in one shot is as large as possible.<\/em><\/p>\n\n<h2 class=\"ts-h2\">Current, and turning the magnetism off again<\/h2>\n<p class=\"ts-p\">For circular magnetization the current is set from the diameter of the part. For longitudinal magnetization in a coil it is set from the ampere turn figure, which grows with the length to diameter ratio because the poles at the ends of a short part fight the applied field, an effect that is considerable below a ratio of 10 to 1 and very significant below 3 to 1. A coil around a part magnetizes about 150 to 230 mm either side of itself, so a part longer than roughly 305 to 460 mm has to be moved through the coil or the coil moved along the part.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:34%\">Magnetization<\/th>\n<th>Current rule<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-grade\">Circular, current passed through the part<\/td><td class=\"ts-safe\">12 to 31 A per mm (300 to 800 A per in.) of the part diameter, and normally 20 A per mm (500 A per in.) or less<\/td><\/tr>\n<tr><td class=\"ts-grade\">Circular, at the top of the band<\/td><td class=\"ts-safe\">Up to 31 A per mm (800 A per in.), used for inclusions or for precipitation-hardened alloys<\/td><\/tr>\n<tr><td class=\"ts-grade\">Prod contacts<\/td><td class=\"ts-safe\">4 to 4.92 A per mm (100 to 125 A per in.) of the prod spacing, with the spacing kept between 50 and 203 mm<\/td><\/tr>\n<tr><td class=\"ts-grade\">Coil, longitudinal<\/td><td class=\"ts-safe\">From the ampere turn figure of 45 000 times the length to diameter ratio of the part<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>Current rules for magnetizing a part, reproduced from Magnetic Particle Inspection in ASM Handbook, Volume 17. The diameter is the largest distance between any two points on the outside circumference of the part.<\/em><\/p>\n<p class=\"ts-p\">A finished part has to be demagnetized afterwards, or chips will cling to it during later machining. The choice of demagnetizing method turns on the size of the part, its hardness and the rate at which it has to be produced, and an alternating current yoke can serve as the demagnetizer in some cases. The published applicability is as below, where A means applicable and N means not applicable.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th rowspan=\"2\" style=\"width:34%\">Method<\/th>\n<th colspan=\"3\">Part size<\/th>\n<th colspan=\"3\">Metal hardness<\/th>\n<th colspan=\"3\">Production rate<\/th>\n<\/tr>\n<tr><th>Small<\/th><th>Medium<\/th><th>Large<\/th><th>Soft<\/th><th>Medium<\/th><th>Hard<\/th><th>Low<\/th><th>Medium<\/th><th>High<\/th><\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-grade\">Coil, 60 Hz ac<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><\/tr>\n<tr><td class=\"ts-grade\">Coil, dc, 30 point reversing step down<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">N<\/td><\/tr>\n<tr><td class=\"ts-grade\">Through current, ac, 30 point step down<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><\/tr>\n<tr><td class=\"ts-grade\">Through current, ac, reactor decay<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><\/tr>\n<tr><td class=\"ts-grade\">Through current, dc, 30 point reversing step down<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">N<\/td><\/tr>\n<tr><td class=\"ts-grade\">Yoke, ac<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">Used for local areas only<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><\/tr>\n<tr><td class=\"ts-grade\">Yoke, reversing dc<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">Used for local areas only<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">N<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>Applicability of demagnetizing methods on the basis of part size, metal hardness and production rate, reproduced from Table 2 of Magnetic Particle Inspection in ASM Handbook, Volume 17. A is applicable and N is not applicable. Where the entry reads that a yoke is used for local areas only, the source limits a yoke on a medium-size part to local work.<\/em><\/p>\n<p class=\"ts-p\">The part is either held magnetized only while the particles are applied, which is the continuous method, or left with enough residual magnetism to attract the particles afterwards, which is the residual method. Only a metal with sufficient retentivity can be left to the residual method, and the residual field is reliable for surface discontinuities only. The continuous method works on any magnetizable metal and is mandatory for low-carbon steel or iron with little retentivity. Maximum sensitivity on a very fine discontinuity comes from immersing the part in a wet bath, passing the current for a short time during immersion, and leaving the current on while the part is withdrawn and the bath drains.<\/p>\n<div class=\"ts-dl\"><div class=\"ts-dl-txt\"><strong>Magnetic particle inspection of tool steel, printable PDF<\/strong> What the method finds and how deep, wet and dry particles, the alternating and direct current split, the current levels measured on an O1 tool steel ring, the magnetization methods and the demagnetizing table, in one PDF with our contact details.<\/div> <a class=\"ts-dl-btn\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-Magnetic-Particle-Inspection-Tool-Steel.pdf\" download> <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m0 0 4.5-4.5M12 15l-4.5-4.5M4 20h16\"\/><\/svg> Download PDF <\/a><\/div>\n\n<h2 class=\"ts-h2\">Grades and stock<\/h2>\n<p class=\"ts-p\">Magnetic particle is one method in the set a tool steel order is checked with, and the others sit beside it on <a href=\"https:\/\/aobosteel.com\/nondestructive-testing-methods-for-steel\/\">the page on choosing a nondestructive test method<\/a>. How the same methods are applied to bar and billet, including the seam depth a permeability system reaches, is set out on <a href=\"https:\/\/aobosteel.com\/steel-bar-and-billet-inspection\/\">the bar and billet inspection page<\/a>.<\/p>\n<p class=\"ts-p\">The cracks this method looks for are also the end of a failure sequence that started earlier, and the changes that precede them are described on <a href=\"https:\/\/aobosteel.com\/decarburization-and-stock-removal-tool-steel\/\">the decarburization and stock removal page<\/a>. Where a part has already broken, the marks the crack left on the fracture face are read with the help of <a href=\"https:\/\/aobosteel.com\/fracture-surface-features-chart\/\">the fracture surface features chart<\/a>, and the wider failure investigation is set out on <a href=\"https:\/\/aobosteel.com\/tool-and-die-failure-analysis\/\">the tool and die failure analysis page<\/a>.<\/p>\n\n<div class=\"ts-dl\"><div class=\"ts-dl-txt\"><strong>Magnetic particle inspection of tool steel, printable PDF<\/strong> What the method finds and how deep, wet and dry particles, the alternating and direct current split, the current levels measured on an O1 tool steel ring, the magnetization methods and the demagnetizing table, in one PDF with our contact details.<\/div> <a class=\"ts-dl-btn\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-Magnetic-Particle-Inspection-Tool-Steel.pdf\" download> <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m0 0 4.5-4.5M12 15l-4.5-4.5M4 20h16\"\/><\/svg> Download PDF <\/a><\/div>\n\n<div class=\"ts-disclaimer\">\n<h3>Before you use these values<\/h3>\n<p>This page is a reference summary of published practice and it is not an Aobo Steel specification. The current levels were measured on one geometry of one grade and they scale with part shape, hardness and the discontinuity being sought. The settings for a given part are established on that part with a known defect before a lot is released.<\/p>\n<\/div>\n\n<p class=\"ts-source\">Source: ASM Handbook, Volume 17, Nondestructive Evaluation and Quality Control, ASM International, 1989.<\/p>\n\n<\/div><\/div><\/section>\n\n","protected":false},"excerpt":{"rendered":"<p>Tool Steel | Magnetic Particle | Surface Cracks Magnetic Particle Inspection of Tool Steel A cracked die, a cracked insert or a cracked bar usually fails at a surface that no chemical test can reach and no radiograph resolves. Magnetic particle inspection is the method that finds those cracks, and it is the one inspection [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-21336","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.6 (Yoast SEO v28.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Magnetic Particle Inspection of Tool Steel<\/title>\n<meta name=\"description\" content=\"Magnetic particle inspection of tool steel: what it finds, how deep it reaches, wet and dry particles, and the current levels measured on an O1 steel ring.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aobosteel.com\/es\/magnetic-particle-inspection-of-tool-steel\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Magnetic Particle Inspection of Tool Steel\" \/>\n<meta property=\"og:description\" content=\"Magnetic particle inspection of tool steel: what it finds, how deep it reaches, wet and dry particles, and the current levels measured on an O1 steel ring.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/aobosteel.com\/es\/magnetic-particle-inspection-of-tool-steel\/\" \/>\n<meta property=\"og:site_name\" content=\"AoboSteel\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/profile.php?id=61565368220197\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data1\" content=\"12 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"TechArticle\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/magnetic-particle-inspection-of-tool-steel\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/magnetic-particle-inspection-of-tool-steel\\\/\"},\"author\":{\"name\":\"Evan\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#\\\/schema\\\/person\\\/96118415c30ca6bb52eaf1127b052ef7\"},\"headline\":\"Magnetic Particle Inspection of Tool Steel\",\"datePublished\":\"2026-10-08T05:30:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/magnetic-particle-inspection-of-tool-steel\\\/\"},\"wordCount\":2598,\"publisher\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#organization\"},\"inLanguage\":\"es\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/magnetic-particle-inspection-of-tool-steel\\\/\",\"url\":\"https:\\\/\\\/aobosteel.com\\\/magnetic-particle-inspection-of-tool-steel\\\/\",\"name\":\"Magnetic Particle Inspection of Tool Steel\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#website\"},\"datePublished\":\"2026-10-08T05:30:26+00:00\",\"description\":\"Magnetic particle inspection of tool steel: what it finds, how deep it reaches, wet and dry particles, and the current levels measured on an O1 steel ring.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/magnetic-particle-inspection-of-tool-steel\\\/#breadcrumb\"},\"inLanguage\":\"es\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/aobosteel.com\\\/magnetic-particle-inspection-of-tool-steel\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/magnetic-particle-inspection-of-tool-steel\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\\\/\\\/aobosteel.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Magnetic Particle Inspection of Tool Steel\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#website\",\"url\":\"https:\\\/\\\/aobosteel.com\\\/\",\"name\":\"AoboSteel\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/aobosteel.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"es\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#organization\",\"name\":\"AoboSteel\",\"url\":\"https:\\\/\\\/aobosteel.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"es\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/aobosteel.com\\\/wp-content\\\/uploads\\\/2025\\\/01\\\/cropped-aobo-steel-1.avif\",\"contentUrl\":\"https:\\\/\\\/aobosteel.com\\\/wp-content\\\/uploads\\\/2025\\\/01\\\/cropped-aobo-steel-1.avif\",\"width\":1052,\"height\":592,\"caption\":\"AoboSteel\"},\"image\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/profile.php?id=61565368220197\",\"https:\\\/\\\/www.linkedin.com\\\/in\\\/aobosteel-evan\\\/\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#\\\/schema\\\/person\\\/96118415c30ca6bb52eaf1127b052ef7\",\"name\":\"Evan\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"es\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8e402f2e6f36093f0bf1855dbf79269cde23cd659c44eefdd7ecf7ff9c05786f?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8e402f2e6f36093f0bf1855dbf79269cde23cd659c44eefdd7ecf7ff9c05786f?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8e402f2e6f36093f0bf1855dbf79269cde23cd659c44eefdd7ecf7ff9c05786f?s=96&d=mm&r=g\",\"caption\":\"Evan\"},\"sameAs\":[\"http:\\\/\\\/www.aobosteel.com\",\"https:\\\/\\\/www.facebook.com\\\/profile.php?id=61565368220197\",\"https:\\\/\\\/www.instagram.com\\\/aobosteel\\\/\",\"https:\\\/\\\/www.linkedin.com\\\/in\\\/aobosteel-evan\\\/\",\"https:\\\/\\\/x.com\\\/AobosteelEvan\",\"https:\\\/\\\/www.youtube.com\\\/@aobosteel\"],\"url\":\"https:\\\/\\\/aobosteel.com\\\/es\\\/blog\\\/author\\\/admin\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Inspecci\u00f3n por part\u00edculas magn\u00e9ticas del acero para herramientas","description":"Magnetic particle inspection of tool steel: what it finds, how deep it reaches, wet and dry particles, and the current levels measured on an O1 steel ring.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/aobosteel.com\/es\/magnetic-particle-inspection-of-tool-steel\/","og_locale":"es_ES","og_type":"article","og_title":"Magnetic Particle Inspection of Tool Steel","og_description":"Magnetic particle inspection of tool steel: what it finds, how deep it reaches, wet and dry particles, and the current levels measured on an O1 steel ring.","og_url":"https:\/\/aobosteel.com\/es\/magnetic-particle-inspection-of-tool-steel\/","og_site_name":"AoboSteel","article_publisher":"https:\/\/www.facebook.com\/profile.php?id=61565368220197","twitter_card":"summary_large_image","twitter_misc":{"Tiempo de lectura":"12 minutos"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"TechArticle","@id":"https:\/\/aobosteel.com\/magnetic-particle-inspection-of-tool-steel\/#article","isPartOf":{"@id":"https:\/\/aobosteel.com\/magnetic-particle-inspection-of-tool-steel\/"},"author":{"name":"Evan","@id":"https:\/\/aobosteel.com\/#\/schema\/person\/96118415c30ca6bb52eaf1127b052ef7"},"headline":"Magnetic Particle Inspection of Tool Steel","datePublished":"2026-10-08T05:30:26+00:00","mainEntityOfPage":{"@id":"https:\/\/aobosteel.com\/magnetic-particle-inspection-of-tool-steel\/"},"wordCount":2598,"publisher":{"@id":"https:\/\/aobosteel.com\/#organization"},"inLanguage":"es"},{"@type":"WebPage","@id":"https:\/\/aobosteel.com\/magnetic-particle-inspection-of-tool-steel\/","url":"https:\/\/aobosteel.com\/magnetic-particle-inspection-of-tool-steel\/","name":"Inspecci\u00f3n por part\u00edculas magn\u00e9ticas del acero para herramientas","isPartOf":{"@id":"https:\/\/aobosteel.com\/#website"},"datePublished":"2026-10-08T05:30:26+00:00","description":"Magnetic particle inspection of tool steel: what it finds, how deep it reaches, wet and dry particles, and the current levels measured on an O1 steel ring.","breadcrumb":{"@id":"https:\/\/aobosteel.com\/magnetic-particle-inspection-of-tool-steel\/#breadcrumb"},"inLanguage":"es","potentialAction":[{"@type":"ReadAction","target":["https:\/\/aobosteel.com\/magnetic-particle-inspection-of-tool-steel\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/aobosteel.com\/magnetic-particle-inspection-of-tool-steel\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/aobosteel.com\/"},{"@type":"ListItem","position":2,"name":"Magnetic Particle Inspection of Tool Steel"}]},{"@type":"WebSite","@id":"https:\/\/aobosteel.com\/#website","url":"https:\/\/aobosteel.com\/","name":"AoboSteel","description":"","publisher":{"@id":"https:\/\/aobosteel.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/aobosteel.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"es"},{"@type":"Organization","@id":"https:\/\/aobosteel.com\/#organization","name":"AoboSteel","url":"https:\/\/aobosteel.com\/","logo":{"@type":"ImageObject","inLanguage":"es","@id":"https:\/\/aobosteel.com\/#\/schema\/logo\/image\/","url":"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/01\/cropped-aobo-steel-1.avif","contentUrl":"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/01\/cropped-aobo-steel-1.avif","width":1052,"height":592,"caption":"AoboSteel"},"image":{"@id":"https:\/\/aobosteel.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/profile.php?id=61565368220197","https:\/\/www.linkedin.com\/in\/aobosteel-evan\/"]},{"@type":"Person","@id":"https:\/\/aobosteel.com\/#\/schema\/person\/96118415c30ca6bb52eaf1127b052ef7","name":"Evan","image":{"@type":"ImageObject","inLanguage":"es","@id":"https:\/\/secure.gravatar.com\/avatar\/8e402f2e6f36093f0bf1855dbf79269cde23cd659c44eefdd7ecf7ff9c05786f?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/8e402f2e6f36093f0bf1855dbf79269cde23cd659c44eefdd7ecf7ff9c05786f?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/8e402f2e6f36093f0bf1855dbf79269cde23cd659c44eefdd7ecf7ff9c05786f?s=96&d=mm&r=g","caption":"Evan"},"sameAs":["http:\/\/www.aobosteel.com","https:\/\/www.facebook.com\/profile.php?id=61565368220197","https:\/\/www.instagram.com\/aobosteel\/","https:\/\/www.linkedin.com\/in\/aobosteel-evan\/","https:\/\/x.com\/AobosteelEvan","https:\/\/www.youtube.com\/@aobosteel"],"url":"https:\/\/aobosteel.com\/es\/blog\/author\/admin\/"}]}},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/es\/blog\/author\/admin\/"},"uagb_comment_info":0,"uagb_excerpt":"Tool Steel | Magnetic Particle | Surface Cracks Magnetic Particle Inspection of Tool Steel A cracked die, a cracked insert or a cracked bar usually fails at a surface that no chemical test can reach and no radiograph resolves. Magnetic particle inspection is the method that finds those cracks, and it is the one inspection&hellip;","rttpg_featured_image_url":null,"rttpg_author":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/es\/blog\/author\/admin\/"},"rttpg_comment":0,"rttpg_category":null,"rttpg_excerpt":"Tool Steel | Magnetic Particle | Surface Cracks Magnetic Particle Inspection of Tool Steel A cracked die, a cracked insert or a cracked bar usually fails at a surface that no chemical test can reach and no radiograph resolves. Magnetic particle inspection is the method that finds those cracks, and it is the one inspection&hellip;","_links":{"self":[{"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/pages\/21336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/comments?post=21336"}],"version-history":[{"count":1,"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/pages\/21336\/revisions"}],"predecessor-version":[{"id":21337,"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/pages\/21336\/revisions\/21337"}],"wp:attachment":[{"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/media?parent=21336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}