Hardness Testing Methods – Animated Demonstration<\/title>\n<style>\n \/* ===== AoboSteel Brand Palette =====\n Primary blue: #0056C7\n Secondary cyan: #00B4E6\n Accent orange: #E85A24\n Dark navy: #003A8C\n Light blue bg: #EAF3FC\n *\/\n\n * { margin: 0; padding: 0; box-sizing: border-box; }\n body {\n background: transparent;\n color: inherit;\n padding: 0;\n }\n .ht-container { max-width: 1200px; margin: 0 auto; }\n .ht-header { text-align: center; margin-bottom: 24px; }\n .ht-header h1 {\n font-size: 28px;\n font-weight: 700;\n margin-bottom: 6px;\n color: #003A8C;\n letter-spacing: 0.3px;\n }\n .ht-header p { color: #5a7ba8; font-size: 14px; }\n .ht-header .ht-accent {\n display: inline-block;\n width: 64px; height: 3px;\n background: linear-gradient(90deg, #E85A24, #00B4E6, #0056C7);\n border-radius: 2px;\n margin-top: 10px;\n }\n .ht-tabs {\n display: flex; gap: 8px; margin-bottom: 20px;\n background: #fff; padding: 8px; border-radius: 12px;\n box-shadow: 0 2px 10px rgba(0, 86, 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justify-content: center;\n box-shadow: 0 2px 6px rgba(0, 86, 199, 0.3);\n }\n .ht-steps strong { color: #003A8C; }\n\n \/* ===== SVG text styles (brand colors) ===== *\/\n .svg-label { font-size: 12px; fill: #4a5f7f; }\n .svg-label-bold { font-size: 13px; fill: #003A8C; font-weight: 600; }\n .svg-dim { font-size: 11px; fill: #0056C7; font-weight: 600; }\n .svg-accent { font-size: 11px; fill: #E85A24; font-weight: 600; }\n .brinell-step-label { font-size: 13px; fill: #0056C7; font-weight: 700; opacity: 0; }\n\n \/* ========== FILE TESTING animations \u2014 always playing ========== *\/\n .file-group { transform-origin: center; animation: fileMove 3.2s ease-in-out infinite; }\n @keyframes fileMove {\n 0% { transform: translateX(-70px); }\n 45% { transform: translateX(70px); }\n 50% { transform: translateX(70px); }\n 55% { transform: translateX(70px); }\n 100% { transform: translateX(-70px); }\n }\n .file-spark { opacity: 0; animation: sparkBlink 0.3s ease-out infinite; animation-delay: 0.4s; }\n @keyframes sparkBlink {\n 0%, 100% { opacity: 0; }\n 50% { opacity: 1; }\n }\n .file-bite-mark { stroke-dasharray: 0 200; animation: drawBite 3.2s ease-out infinite; }\n @keyframes drawBite {\n 0%, 40% { stroke-dasharray: 0 200; }\n 50%, 100% { stroke-dasharray: 200 0; }\n }\n\n \/* ========== ROCKWELL animations \u2014 always playing ========== *\/\n .rockwell-indenter { transform: translateY(0); animation: rockwellPress 3.6s ease-in-out infinite; }\n @keyframes rockwellPress {\n 0% { transform: translateY(0); }\n 30% { transform: translateY(56px); }\n 55% { transform: translateY(60px); }\n 75% { transform: translateY(56px); }\n 100% { transform: translateY(0); }\n }\n .rockwell-indent { opacity: 0; animation: showIndent 3.6s ease-out infinite; }\n @keyframes showIndent {\n 0%, 30% { opacity: 0; }\n 40%, 75% { opacity: 1; }\n 85%, 100% { opacity: 0; }\n }\n .load-arrow { opacity: 0; animation: showLoad 3.6s ease-in-out infinite; }\n @keyframes showLoad {\n 0%, 25% { opacity: 0; }\n 30%, 75% { opacity: 1; }\n 80%, 100% { opacity: 0; }\n }\n\n \/* ========== BRINELL animations \u2014 always playing ========== *\/\n .brinell-ball { transform: translateY(0); animation: brinellPress 6s ease-in-out infinite; }\n @keyframes brinellPress {\n 0% { transform: translateY(0); }\n 15% { transform: translateY(48px); }\n 40% { transform: translateY(48px); }\n 55% { transform: translateY(0); }\n 100% { transform: translateY(0); }\n }\n .brinell-indent { opacity: 0; animation: brinellShowIndent 6s ease-out infinite; }\n @keyframes brinellShowIndent {\n 0%, 40% { opacity: 0; }\n 50%, 100% { opacity: 1; }\n }\n .brinell-microscope { opacity: 0; animation: brinellMeasure 6s ease-in-out infinite; }\n @keyframes brinellMeasure {\n 0%, 55% { opacity: 0; }\n 65%, 95% { opacity: 1; }\n 100% { opacity: 0; }\n }\n .brinell-step-label.s1 { animation: step1show 6s ease-in-out infinite; }\n .brinell-step-label.s2 { animation: step2show 6s ease-in-out infinite; }\n .brinell-step-label.s3 { animation: step3show 6s ease-in-out infinite; }\n .brinell-step-label.s4 { animation: step4show 6s ease-in-out infinite; }\n @keyframes step1show { 0%,15%{opacity:1;} 20%,100%{opacity:0;} }\n @keyframes step2show { 15%,40%{opacity:1;} 45%,100%{opacity:0;} }\n @keyframes step3show { 40%,55%{opacity:1;} 60%,100%{opacity:0;} }\n @keyframes step4show { 55%,95%{opacity:1;} 100%,0%{opacity:0;} }\n .brinell-load { opacity: 0; animation: brinellShowLoad 6s ease-in-out infinite; }\n @keyframes brinellShowLoad {\n 0%, 15% { opacity: 0; }\n 20%, 40% { opacity: 1; }\n 45%, 100% { opacity: 0; }\n }\n<\/style>\n<\/head>\n<body>\n<div class=\"ht-container\">\n <div class=\"ht-header\">\n <h1>Hardness Testing Methods<\/h1>\n <p>Animated demonstration of three workshop hardness tests<\/p>\n <span class=\"ht-accent\"><\/span>\n <\/div>\n\n <div class=\"ht-tabs\">\n <button class=\"ht-tab active\" onclick=\"showPanel('file', this)\">FILE TESTING<\/button>\n <button class=\"ht-tab\" onclick=\"showPanel('rockwell', this)\">ROCKWELL TESTING<\/button>\n <button class=\"ht-tab\" onclick=\"showPanel('brinell', this)\">BRINELL TESTING<\/button>\n <\/div>\n\n \n <div class=\"ht-panel active\" id=\"panel-file\">\n <div class=\"ht-stage file-stage\" id=\"file-stage\">\n <svg viewBox=\"0 0 680 420\" width=\"680\" height=\"420\">\n \n <rect x=\"60\" y=\"290\" width=\"560\" height=\"18\" fill=\"#8b9cb8\"\/>\n <rect x=\"60\" y=\"308\" width=\"560\" height=\"45\" fill=\"#5a7ba8\"\/>\n\n \n <rect x=\"200\" y=\"252\" width=\"280\" height=\"38\" fill=\"#b8c9dd\" stroke=\"#5a7ba8\" stroke-width=\"2\"\/>\n <rect x=\"200\" y=\"252\" width=\"280\" height=\"5\" fill=\"#dce6f2\"\/>\n\n \n <g class=\"file-bite-marks\">\n <line class=\"file-bite-mark\" x1=\"230\" y1=\"252\" x2=\"240\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"250\" y1=\"252\" x2=\"260\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"270\" y1=\"252\" x2=\"280\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"290\" y1=\"252\" x2=\"300\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"310\" y1=\"252\" x2=\"320\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"330\" y1=\"252\" x2=\"340\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"350\" y1=\"252\" x2=\"360\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"370\" y1=\"252\" x2=\"380\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"390\" y1=\"252\" x2=\"400\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"410\" y1=\"252\" x2=\"420\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"430\" y1=\"252\" x2=\"440\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <\/g>\n\n \n <text x=\"170\" y=\"150\" class=\"svg-label-bold\">Hardened File (known HRC)<\/text>\n <line x1=\"170\" y1=\"156\" x2=\"150\" y2=\"216\" stroke=\"#5a7ba8\" stroke-width=\"0.8\" stroke-dasharray=\"2 2\"\/>\n\n \n <g opacity=\"0.8\">\n <line x1=\"380\" y1=\"144\" x2=\"460\" y2=\"144\" stroke=\"#0056C7\" stroke-width=\"2\" stroke-dasharray=\"4 3\"\/>\n <polygon points=\"460,144 452,139 452,149\" fill=\"#0056C7\"\/>\n <text x=\"420\" y=\"136\" class=\"svg-dim\" text-anchor=\"middle\">forward motion<\/text>\n <\/g>\n\n \n <g transform=\"translate(0, 30)\">\n <g class=\"file-group\" id=\"file-group\">\n <rect x=\"40\" y=\"190\" width=\"60\" height=\"22\" rx=\"4\" fill=\"#E85A24\" stroke=\"#c74a1c\" stroke-width=\"1.5\"\/>\n <rect x=\"42\" y=\"193\" width=\"56\" height=\"4\" fill=\"#ff7a45\"\/>\n <polygon points=\"100,191 280,180 280,222 100,212\" fill=\"#dce6f2\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n <g stroke=\"#5a7ba8\" stroke-width=\"0.6\">\n <line x1=\"110\" y1=\"194\" x2=\"115\" y2=\"202\"\/><line x1=\"118\" y1=\"193\" x2=\"123\" y2=\"201\"\/>\n <line x1=\"126\" y1=\"193\" x2=\"131\" y2=\"201\"\/><line x1=\"134\" y1=\"192\" x2=\"139\" y2=\"200\"\/>\n <line x1=\"142\" y1=\"192\" x2=\"147\" y2=\"200\"\/><line x1=\"150\" y1=\"191\" x2=\"155\" y2=\"199\"\/>\n <line x1=\"158\" y1=\"191\" x2=\"163\" y2=\"199\"\/><line x1=\"166\" y1=\"190\" x2=\"171\" y2=\"198\"\/>\n <line x1=\"174\" y1=\"190\" x2=\"179\" y2=\"198\"\/><line x1=\"182\" y1=\"189\" x2=\"187\" y2=\"197\"\/>\n <line x1=\"190\" y1=\"189\" x2=\"195\" y2=\"197\"\/><line x1=\"198\" y1=\"188\" x2=\"203\" y2=\"196\"\/>\n <line x1=\"206\" y1=\"188\" x2=\"211\" y2=\"196\"\/><line x1=\"214\" y1=\"187\" x2=\"219\" y2=\"195\"\/>\n <line x1=\"222\" y1=\"187\" x2=\"227\" y2=\"195\"\/><line x1=\"230\" y1=\"186\" x2=\"235\" y2=\"194\"\/>\n <line x1=\"238\" y1=\"186\" x2=\"243\" y2=\"194\"\/><line x1=\"246\" y1=\"185\" x2=\"251\" y2=\"193\"\/>\n <line x1=\"254\" y1=\"185\" x2=\"259\" y2=\"193\"\/><line x1=\"262\" y1=\"184\" x2=\"267\" y2=\"192\"\/>\n <line x1=\"110\" y1=\"204\" x2=\"115\" y2=\"212\"\/><line x1=\"118\" y1=\"203\" x2=\"123\" y2=\"211\"\/>\n <line x1=\"126\" y1=\"203\" x2=\"131\" y2=\"211\"\/><line x1=\"134\" y1=\"202\" x2=\"139\" y2=\"210\"\/>\n <line x1=\"142\" y1=\"202\" x2=\"147\" y2=\"210\"\/><line x1=\"150\" y1=\"201\" x2=\"155\" y2=\"209\"\/>\n <line x1=\"158\" y1=\"201\" x2=\"163\" y2=\"209\"\/><line x1=\"166\" y1=\"200\" x2=\"171\" y2=\"208\"\/>\n <line x1=\"174\" y1=\"200\" x2=\"179\" y2=\"208\"\/><line x1=\"182\" y1=\"199\" x2=\"187\" y2=\"207\"\/>\n <line x1=\"190\" y1=\"199\" x2=\"195\" y2=\"207\"\/><line x1=\"198\" y1=\"198\" x2=\"203\" y2=\"206\"\/>\n <line x1=\"206\" y1=\"198\" x2=\"210\" y2=\"206\"\/><line x1=\"214\" y1=\"197\" x2=\"219\" y2=\"205\"\/>\n <line x1=\"222\" y1=\"197\" x2=\"227\" y2=\"205\"\/><line x1=\"230\" y1=\"196\" x2=\"235\" y2=\"204\"\/>\n <line x1=\"238\" y1=\"196\" x2=\"243\" y2=\"204\"\/><line x1=\"246\" y1=\"195\" x2=\"251\" y2=\"203\"\/>\n <line x1=\"254\" y1=\"195\" x2=\"259\" y2=\"203\"\/><line x1=\"262\" y1=\"194\" x2=\"267\" y2=\"202\"\/>\n <\/g>\n <polygon points=\"280,180 295,188 295,214 280,222\" fill=\"#b8c9dd\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n <g class=\"file-spark\">\n <circle cx=\"295\" cy=\"210\" r=\"2\" fill=\"#E85A24\"\/>\n <circle cx=\"305\" cy=\"208\" r=\"1.5\" fill=\"#ff7a45\"\/>\n <circle cx=\"312\" cy=\"214\" r=\"1.2\" fill=\"#ffb380\"\/>\n <line x1=\"295\" y1=\"210\" x2=\"315\" y2=\"202\" stroke=\"#E85A24\" stroke-width=\"0.8\"\/>\n <\/g>\n <\/g>\n <\/g>\n\n \n <g opacity=\"0.7\">\n <text x=\"30\" y=\"262\" class=\"svg-accent\">\u2193 gentle<\/text>\n <text x=\"30\" y=\"275\" class=\"svg-accent\">pressure<\/text>\n <\/g>\n\n \n <text x=\"492\" y=\"275\" class=\"svg-label-bold\">Workpiece (steel)<\/text>\n\n \n <text x=\"340\" y=\"390\" class=\"svg-label\" text-anchor=\"middle\">File Testing \u2014 bite vs. slip comparison<\/text>\n <\/svg>\n <\/div>\n <div class=\"ht-controls\">\n <div class=\"ht-step-indicator\" id=\"step-file\">Pressing file against workpiece…<\/div>\n <\/div>\n <div class=\"ht-info\">\n <h2>File Testing <span class=\"ht-badge\">Method 1<\/span><\/h2>\n <p>\n A hardened file of standardized hardness is lightly pressed against the part and pushed with a\n <strong>slow forward motion<\/strong> over the surface. The tester feels the “bite” or “slip” of the\n file through the fingers. If the file does not bite, the part is considered <em>“file hard”<\/em> \u2014\n as hard as, or harder than, the file itself.\n <\/p>\n <p>\n By using a set of files hardened in five-point increments from <strong>40\u201365 HRC<\/strong>, the operator\n works from a hard file (which bites) down to softer files until one slips. The workpiece hardness lies\n between the file that marks and the file that slips.\n <\/p>\n <div class=\"ht-specs\">\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">File Hardness Range<\/div><div class=\"ht-spec-value\">40 \u2013 65 HRC (5-pt steps)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Motion<\/div><div class=\"ht-spec-value\">Slow, forward, gentle pressure<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Best For<\/div><div class=\"ht-spec-value\">Decarb \/ soft-spot checks, large tools<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Result Type<\/div><div class=\"ht-spec-value\">Comparative (approximate HRC)<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"ht-panel\" id=\"panel-rockwell\">\n <div class=\"ht-stage rockwell-stage\" id=\"rockwell-stage\">\n <svg viewBox=\"0 0 680 420\" width=\"680\" height=\"420\">\n \n <g class=\"load-arrow\">\n <text x=\"352\" y=\"30\" class=\"svg-accent\" text-anchor=\"start\">150 kgf load<\/text>\n <line x1=\"340\" y1=\"26\" x2=\"340\" y2=\"58\" stroke=\"#E85A24\" stroke-width=\"2.5\"\/>\n <polygon points=\"340,66 333,56 347,56\" fill=\"#E85A24\"\/>\n <\/g>\n\n \n <rect x=\"270\" y=\"70\" width=\"140\" height=\"35\" fill=\"#0056C7\" rx=\"4\"\/>\n <rect x=\"330\" y=\"105\" width=\"20\" height=\"28\" fill=\"#003A8C\"\/>\n\n \n <g class=\"rockwell-indenter\" id=\"rockwell-indenter\">\n <rect x=\"322\" y=\"133\" width=\"36\" height=\"42\" fill=\"#8b9cb8\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n <rect x=\"326\" y=\"138\" width=\"28\" height=\"5\" fill=\"#b8c9dd\"\/>\n <polygon points=\"322,175 358,175 345,205 335,205\" fill=\"#dce6f2\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n <polygon points=\"335,205 345,205 340,215\" fill=\"#fff\" stroke=\"#5a7ba8\" stroke-width=\"1.2\"\/>\n <line x1=\"328\" y1=\"177\" x2=\"340\" y2=\"205\" stroke=\"#fff\" stroke-width=\"1\" opacity=\"0.7\"\/>\n <\/g>\n\n \n <text x=\"314\" y=\"163\" class=\"svg-label-bold\" text-anchor=\"end\">Diamond<\/text>\n <text x=\"314\" y=\"176\" class=\"svg-label\" text-anchor=\"end\">Penetrator<\/text>\n <line x1=\"316\" y1=\"170\" x2=\"321\" y2=\"172\" stroke=\"#5a7ba8\" stroke-width=\"0.8\" stroke-dasharray=\"2 2\"\/>\n\n \n <rect x=\"240\" y=\"240\" width=\"200\" height=\"38\" fill=\"#b8c9dd\" stroke=\"#5a7ba8\" stroke-width=\"2\"\/>\n <rect x=\"240\" y=\"240\" width=\"200\" height=\"5\" fill=\"#dce6f2\"\/>\n\n \n <g class=\"rockwell-indent\">\n <polygon points=\"335,240 345,240 340,252\" fill=\"#003A8C\"\/>\n <text x=\"368\" y=\"234\" class=\"svg-accent\">indent<\/text>\n <\/g>\n\n \n <rect x=\"220\" y=\"278\" width=\"240\" height=\"18\" fill=\"#8b9cb8\"\/>\n <rect x=\"220\" y=\"296\" width=\"240\" height=\"42\" fill=\"#5a7ba8\"\/>\n <rect x=\"200\" y=\"338\" width=\"280\" height=\"10\" fill=\"#0056C7\" rx=\"2\"\/>\n\n \n <rect x=\"195\" y=\"105\" width=\"14\" height=\"245\" fill=\"#5a7ba8\"\/>\n <rect x=\"471\" y=\"105\" width=\"14\" height=\"245\" fill=\"#5a7ba8\"\/>\n\n \n <text x=\"340\" y=\"365\" class=\"svg-label-bold\" text-anchor=\"middle\">Anvil<\/text>\n <text x=\"340\" y=\"395\" class=\"svg-label\" text-anchor=\"middle\">Rockwell C Hardness Tester<\/text>\n\n \n <g transform=\"translate(530, 133)\">\n <line x1=\"0\" y1=\"0\" x2=\"0\" y2=\"105\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"-4\" y1=\"0\" x2=\"4\" y2=\"0\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"-4\" y1=\"105\" x2=\"4\" y2=\"105\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"-3\" y1=\"52\" x2=\"3\" y2=\"52\" stroke=\"#0056C7\" stroke-width=\"1\"\/>\n <text x=\"10\" y=\"6\" class=\"svg-dim\">0<\/text>\n <text x=\"10\" y=\"57\" class=\"svg-dim\">depth<\/text>\n <text x=\"10\" y=\"110\" class=\"svg-dim\">max<\/text>\n <text x=\"0\" y=\"128\" class=\"svg-label\" text-anchor=\"middle\">HRC =<\/text>\n <text x=\"0\" y=\"141\" class=\"svg-label\" text-anchor=\"middle\">f(depth)<\/text>\n <\/g>\n <\/svg>\n <\/div>\n <div class=\"ht-controls\">\n <div class=\"ht-step-indicator\" id=\"step-rockwell\">Lowering diamond penetrator<\/div>\n <\/div>\n <div class=\"ht-info\">\n <h2>Rockwell Testing (C Scale) <span class=\"ht-badge\">Method 2<\/span><\/h2>\n <p>\n The Rockwell C scale is the most common hardness test for heat-treated tooling over\n <strong>40 HRC<\/strong>. A <strong>330-lbf (150-kgf) load<\/strong> is pressed into the workpiece\n through a <strong>spheroconical diamond penetrator<\/strong>. The depth of indentation \u2014 not the\n diameter \u2014 is the basis for the Rockwell hardness number.\n <\/p>\n <p>\n Always take at least <strong>four readings<\/strong>; omit the first (seating). If three are within\n \u00b11 HRC, the result can be averaged. Never retest in the same indentation.\n <\/p>\n <div class=\"ht-specs\">\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Load<\/div><div class=\"ht-spec-value\">330 lbf (150 kgf)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Penetrator<\/div><div class=\"ht-spec-value\">Spheroconical diamond (Brale)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Measurement<\/div><div class=\"ht-spec-value\">Depth of indentation \u2192 HRC<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Range<\/div><div class=\"ht-spec-value\">Over 40 HRC (heat-treated tooling)<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"ht-panel\" id=\"panel-brinell\">\n <div class=\"ht-stage brinell-stage\" id=\"brinell-stage\">\n <svg viewBox=\"0 0 680 420\" width=\"680\" height=\"420\">\n \n <text class=\"brinell-step-label s1\" x=\"70\" y=\"32\">\u2460 Apply load<\/text>\n <text class=\"brinell-step-label s2\" x=\"70\" y=\"32\">\u2461 Hold (dwell)<\/text>\n <text class=\"brinell-step-label s3\" x=\"70\" y=\"32\">\u2462 Remove load<\/text>\n <text class=\"brinell-step-label s4\" x=\"70\" y=\"32\">\u2463 Measure diameter<\/text>\n\n \n <g class=\"brinell-load\">\n <text x=\"352\" y=\"40\" class=\"svg-accent\" text-anchor=\"start\">3000 kgf<\/text>\n <line x1=\"340\" y1=\"36\" x2=\"340\" y2=\"68\" stroke=\"#E85A24\" stroke-width=\"2.5\"\/>\n <polygon points=\"340,76 333,66 347,66\" fill=\"#E85A24\"\/>\n <\/g>\n\n \n <rect x=\"270\" y=\"80\" width=\"140\" height=\"35\" fill=\"#0056C7\" rx=\"4\"\/>\n <rect x=\"330\" y=\"115\" width=\"20\" height=\"26\" fill=\"#003A8C\"\/>\n\n \n <rect x=\"322\" y=\"141\" width=\"36\" height=\"36\" fill=\"#8b9cb8\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n\n \n <g class=\"brinell-ball\" id=\"brinell-ball\">\n <circle cx=\"340\" cy=\"191\" r=\"14\" fill=\"#0056C7\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <circle cx=\"336\" cy=\"187\" r=\"4\" fill=\"#00B4E6\" opacity=\"0.7\"\/>\n <\/g>\n \n <text x=\"368\" y=\"186\" class=\"svg-label\">10 mm<\/text>\n <text x=\"368\" y=\"199\" class=\"svg-label\">ball<\/text>\n\n \n <rect x=\"220\" y=\"245\" width=\"240\" height=\"38\" fill=\"#b8c9dd\" stroke=\"#5a7ba8\" stroke-width=\"2\"\/>\n <rect x=\"220\" y=\"245\" width=\"240\" height=\"5\" fill=\"#dce6f2\"\/>\n\n \n <g class=\"brinell-indent\">\n <ellipse cx=\"340\" cy=\"245\" rx=\"18\" ry=\"5\" fill=\"#003A8C\" opacity=\"0.85\"\/>\n <ellipse cx=\"340\" cy=\"245\" rx=\"18\" ry=\"5\" fill=\"none\" stroke=\"#E85A24\" stroke-width=\"1.2\"\/>\n <line x1=\"322\" y1=\"235\" x2=\"358\" y2=\"235\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"322\" y1=\"231\" x2=\"322\" y2=\"239\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"358\" y1=\"231\" x2=\"358\" y2=\"239\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <text x=\"340\" y=\"227\" class=\"svg-dim\" text-anchor=\"middle\">d (diameter)<\/text>\n <\/g>\n\n \n <g class=\"brinell-microscope\" id=\"brinell-microscope\">\n <rect x=\"270\" y=\"160\" width=\"18\" height=\"50\" fill=\"#0056C7\" rx=\"2\"\/>\n <rect x=\"266\" y=\"210\" width=\"26\" height=\"8\" fill=\"#5a7ba8\"\/>\n <polygon points=\"279,218 287,245 271,245\" fill=\"#003A8C\"\/>\n <rect x=\"275\" y=\"140\" width=\"8\" height=\"20\" fill=\"#8b9cb8\"\/>\n <ellipse cx=\"279\" cy=\"140\" rx=\"7\" ry=\"3\" fill=\"#0056C7\"\/>\n <text x=\"262\" y=\"165\" class=\"svg-label\" text-anchor=\"end\">Measuring<\/text>\n <text x=\"262\" y=\"178\" class=\"svg-label\" text-anchor=\"end\">Microscope<\/text>\n <text x=\"262\" y=\"191\" class=\"svg-dim\" text-anchor=\"end\">\u00b10.005 mm<\/text>\n <\/g>\n\n \n <rect x=\"200\" y=\"283\" width=\"280\" height=\"18\" fill=\"#8b9cb8\"\/>\n <rect x=\"200\" y=\"301\" width=\"280\" height=\"42\" fill=\"#5a7ba8\"\/>\n <rect x=\"180\" y=\"343\" width=\"320\" height=\"10\" fill=\"#0056C7\" rx=\"2\"\/>\n\n \n <text x=\"340\" y=\"370\" class=\"svg-label-bold\" text-anchor=\"middle\">Anvil<\/text>\n <text x=\"340\" y=\"395\" class=\"svg-label\" text-anchor=\"middle\">Brinell Hardness Tester \u2014 4-step process<\/text>\n <\/svg>\n <\/div>\n <div class=\"ht-controls\">\n <div class=\"ht-step-indicator\" id=\"step-brinell\">\u2460 Ball pressing into surface (3000 kgf)<\/div>\n <\/div>\n <div class=\"ht-info\">\n <h2>Brinell Testing <span class=\"ht-badge\">Method 3<\/span><\/h2>\n <p>\n The Brinell test forces a <strong>hard ball<\/strong> (10-mm \/ 0.39-in. diameter) under a specified load\n \u2014 typically <strong>6,600 lbf (3,000 kgf)<\/strong> \u2014 into the surface of the material. After the load\n is removed, the <strong>diameter of the impression<\/strong> is measured with a measuring microscope\n (graduated to 0.005 mm) and converted into a Brinell hardness number (HB).\n <\/p>\n <p>\n Best suited for material in the <strong>annealed or low-hardness range (\u2264 375 HB)<\/strong>. Material\n over 375 HB (\u2248 40 HRC) should be tested with Rockwell C instead.\n <\/p>\n <ol class=\"ht-steps\">\n <li><strong>Apply load:<\/strong> Ball is pressed into the surface under 3,000 kgf.<\/li>\n <li><strong>Hold (dwell):<\/strong> Load is maintained to form a full impression.<\/li>\n <li><strong>Remove load:<\/strong> Ball is retracted, leaving a spherical indentation.<\/li>\n <li><strong>Measure:<\/strong> Diameter of impression is read with a microscope \u2192 converted to HB.<\/li>\n <\/ol>\n <div class=\"ht-specs\">\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Ball Diameter<\/div><div class=\"ht-spec-value\">10 mm (0.39 in.)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Standard Load<\/div><div class=\"ht-spec-value\">6,600 lbf (3,000 kgf)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Ball Material<\/div><div class=\"ht-spec-value\">Steel (\u2264450 HB) \/ Tungsten-Carbide (harder)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Measurement<\/div><div class=\"ht-spec-value\">Diameter of impression \u2192 HB number<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n<script>\n var stepRefs = {\n file: { stepEl: 'step-file', cycle: 3200 },\n rockwell: { stepEl: 'step-rockwell', cycle: 3600 },\n brinell: { stepEl: 'step-brinell', cycle: 6000 }\n };\n var messages = {\n file: [\n 'Pressing file against workpiece...',\n 'Forward stroke \u2014 feeling the bite',\n 'File marks the surface',\n 'Returning \u2014 try softer file next'\n ],\n rockwell: [\n 'Lowering diamond penetrator',\n 'Applying 150 kgf load',\n 'Measuring indentation depth',\n 'Retracting \u2014 reading HRC value'\n ],\n brinell: [\n '\u2460 Ball pressing into surface (3000 kgf)',\n '\u2461 Holding load \u2014 dwelling',\n '\u2462 Removing load \u2014 impression left',\n '\u2463 Measuring diameter with microscope'\n ]\n };\n\n function showPanel(name, btn) {\n var panels = document.querySelectorAll('.ht-panel');\n for (var i = 0; i < panels.length; i++) panels[i].classList.remove('active');\n var tabs = document.querySelectorAll('.ht-tab');\n for (var j = 0; j < tabs.length; j++) tabs[j].classList.remove('active');\n document.getElementById('panel-' + name).classList.add('active');\n if (btn) btn.classList.add('active');\n }\n\n function startStepCycle(name) {\n var ref = stepRefs[name];\n var stepEl = document.getElementById(ref.stepEl);\n if (!stepEl) return;\n var msgs = messages[name];\n var i = 0;\n stepEl.textContent = msgs[0];\n i = 1;\n setInterval(function() {\n stepEl.textContent = msgs[i % msgs.length];\n i++;\n }, ref.cycle \/ msgs.length);\n }\n\n \/\/ Start step cycles for all panels on load\n function init() {\n for (var name in stepRefs) {\n startStepCycle(name);\n }\n }\n\n if (document.readyState === 'loading') {\n document.addEventListener('DOMContentLoaded', init);\n } else {\n init();\n }\n<\/script>\n<\/body>\n<\/html>\n\n\n\n\n<ul class=\"wp-block-yoast-seo-related-links yoast-seo-related-links\">\n<li><a href=\"https:\/\/aobosteel.com\/tool-steel-hardness-conversion-calculator\/\">Tool Steel Hardness Conversion Calculator (HRC, HV, HBW, HRB)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/tool-steel-quality-verification\/\">How to Verify Tool Steel Quality Before Bulk Purchase<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/tool-steel-equivalent-grades\/\">Equivalent grades finder<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Hardness Testing Methods – Animated Demonstration Hardness Testing Methods Animated demonstration of three workshop hardness tests FILE TESTING ROCKWELL TESTING BRINELL TESTING Hardened File (known HRC) forward motion \u2193 gentle pressure Workpiece (steel) File Testing \u2014 bite vs. slip comparison Pressing file against workpiece… File Testing Method 1 A hardened file of standardized hardness is […]<\/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":"normal-width-container","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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& Brinell Explained - AoboSteel<\/title>\n<meta name=\"description\" content=\"Compare file, Rockwell C, and Brinell hardness testing methods for tool steel, covering equipment, load specs, and when to use each test.\" \/>\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\/ko\/hardness-testing-methods\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hardness Testing Methods: File, Rockwell & Brinell Explained\" \/>\n<meta property=\"og:description\" content=\"Compare file, Rockwell C, and Brinell hardness testing methods for tool steel, covering equipment, load specs, and when to use each test.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/aobosteel.com\/ko\/hardness-testing-methods\/\" \/>\n<meta property=\"og:site_name\" content=\"AoboSteel\" \/>\n<meta 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Testing Methods – Animated Demonstration Hardness Testing Methods Animated demonstration of three workshop hardness tests FILE TESTING ROCKWELL TESTING BRINELL TESTING Hardened File (known HRC) forward motion \u2193 gentle pressure Workpiece (steel) File Testing \u2014 bite vs. slip comparison Pressing file against workpiece… File Testing Method 1 A hardened file of standardized hardness is…","rttpg_featured_image_url":null,"rttpg_author":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/ko\/blog\/author\/admin\/"},"rttpg_comment":0,"rttpg_category":null,"rttpg_excerpt":"Hardness Testing Methods – Animated Demonstration Hardness Testing Methods Animated demonstration of three workshop hardness tests FILE TESTING ROCKWELL TESTING BRINELL TESTING Hardened File (known HRC) forward motion \u2193 gentle pressure Workpiece (steel) File Testing \u2014 bite vs. slip comparison Pressing file against workpiece… File Testing Method 1 A hardened file of standardized hardness 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{"id":16793,"date":"2026-07-21T10:04:41","date_gmt":"2026-07-21T02:04:41","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=16793"},"modified":"2026-07-21T10:04:42","modified_gmt":"2026-07-21T02:04:42","slug":"hardness-testing-methods","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/hardness-testing-methods\/","title":{"rendered":"Hardness Testing Methods: File, Rockwell & Brinell Explained"},"content":{"rendered":"\n\n\n\n\nHardness Testing Methods – Animated Demonstration<\/title>\n<style>\n \/* ===== AoboSteel Brand Palette =====\n Primary blue: #0056C7\n Secondary cyan: #00B4E6\n Accent orange: #E85A24\n Dark navy: #003A8C\n Light blue bg: #EAF3FC\n *\/\n\n * { margin: 0; padding: 0; box-sizing: border-box; }\n body {\n background: transparent;\n color: inherit;\n padding: 0;\n }\n .ht-container { max-width: 1200px; margin: 0 auto; }\n .ht-header { text-align: center; margin-bottom: 24px; }\n .ht-header h1 {\n font-size: 28px;\n font-weight: 700;\n 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TESTING animations \u2014 always playing ========== *\/\n .file-group { transform-origin: center; animation: fileMove 3.2s ease-in-out infinite; }\n @keyframes fileMove {\n 0% { transform: translateX(-70px); }\n 45% { transform: translateX(70px); }\n 50% { transform: translateX(70px); }\n 55% { transform: translateX(70px); }\n 100% { transform: translateX(-70px); }\n }\n .file-spark { opacity: 0; animation: sparkBlink 0.3s ease-out infinite; animation-delay: 0.4s; }\n @keyframes sparkBlink {\n 0%, 100% { opacity: 0; }\n 50% { opacity: 1; }\n }\n .file-bite-mark { stroke-dasharray: 0 200; animation: drawBite 3.2s ease-out infinite; }\n @keyframes drawBite {\n 0%, 40% { stroke-dasharray: 0 200; }\n 50%, 100% { stroke-dasharray: 200 0; }\n }\n\n \/* ========== ROCKWELL animations \u2014 always playing ========== *\/\n .rockwell-indenter { transform: translateY(0); animation: rockwellPress 3.6s ease-in-out infinite; }\n @keyframes rockwellPress {\n 0% { transform: translateY(0); }\n 30% { 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}\n @keyframes brinellShowIndent {\n 0%, 40% { opacity: 0; }\n 50%, 100% { opacity: 1; }\n }\n .brinell-microscope { opacity: 0; animation: brinellMeasure 6s ease-in-out infinite; }\n @keyframes brinellMeasure {\n 0%, 55% { opacity: 0; }\n 65%, 95% { opacity: 1; }\n 100% { opacity: 0; }\n }\n .brinell-step-label.s1 { animation: step1show 6s ease-in-out infinite; }\n .brinell-step-label.s2 { animation: step2show 6s ease-in-out infinite; }\n .brinell-step-label.s3 { animation: step3show 6s ease-in-out infinite; }\n .brinell-step-label.s4 { animation: step4show 6s ease-in-out infinite; }\n @keyframes step1show { 0%,15%{opacity:1;} 20%,100%{opacity:0;} }\n @keyframes step2show { 15%,40%{opacity:1;} 45%,100%{opacity:0;} }\n @keyframes step3show { 40%,55%{opacity:1;} 60%,100%{opacity:0;} }\n @keyframes step4show { 55%,95%{opacity:1;} 100%,0%{opacity:0;} }\n .brinell-load { opacity: 0; animation: brinellShowLoad 6s ease-in-out infinite; }\n @keyframes brinellShowLoad {\n 0%, 15% { opacity: 0; }\n 20%, 40% { opacity: 1; }\n 45%, 100% { opacity: 0; }\n }\n<\/style>\n<\/head>\n<body>\n<div class=\"ht-container\">\n <div class=\"ht-header\">\n <h1>Hardness Testing Methods<\/h1>\n <p>Animated demonstration of three workshop hardness tests<\/p>\n <span class=\"ht-accent\"><\/span>\n <\/div>\n\n <div class=\"ht-tabs\">\n <button class=\"ht-tab active\" onclick=\"showPanel('file', this)\">FILE TESTING<\/button>\n <button class=\"ht-tab\" onclick=\"showPanel('rockwell', this)\">ROCKWELL TESTING<\/button>\n <button class=\"ht-tab\" onclick=\"showPanel('brinell', this)\">BRINELL TESTING<\/button>\n <\/div>\n\n \n <div class=\"ht-panel active\" id=\"panel-file\">\n <div class=\"ht-stage file-stage\" id=\"file-stage\">\n <svg viewBox=\"0 0 680 420\" width=\"680\" height=\"420\">\n \n <rect x=\"60\" y=\"290\" width=\"560\" height=\"18\" fill=\"#8b9cb8\"\/>\n <rect x=\"60\" y=\"308\" width=\"560\" height=\"45\" fill=\"#5a7ba8\"\/>\n\n \n <rect x=\"200\" y=\"252\" width=\"280\" height=\"38\" fill=\"#b8c9dd\" stroke=\"#5a7ba8\" stroke-width=\"2\"\/>\n <rect x=\"200\" y=\"252\" width=\"280\" height=\"5\" fill=\"#dce6f2\"\/>\n\n \n <g class=\"file-bite-marks\">\n <line class=\"file-bite-mark\" x1=\"230\" y1=\"252\" x2=\"240\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"250\" y1=\"252\" x2=\"260\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"270\" y1=\"252\" x2=\"280\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"290\" y1=\"252\" x2=\"300\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"310\" y1=\"252\" x2=\"320\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"330\" y1=\"252\" x2=\"340\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"350\" y1=\"252\" x2=\"360\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"370\" y1=\"252\" x2=\"380\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"390\" y1=\"252\" x2=\"400\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"410\" y1=\"252\" x2=\"420\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <line class=\"file-bite-mark\" x1=\"430\" y1=\"252\" x2=\"440\" y2=\"248\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <\/g>\n\n \n <text x=\"170\" y=\"150\" class=\"svg-label-bold\">Hardened File (known HRC)<\/text>\n <line x1=\"170\" y1=\"156\" x2=\"150\" y2=\"216\" stroke=\"#5a7ba8\" stroke-width=\"0.8\" stroke-dasharray=\"2 2\"\/>\n\n \n <g opacity=\"0.8\">\n <line x1=\"380\" y1=\"144\" x2=\"460\" y2=\"144\" stroke=\"#0056C7\" stroke-width=\"2\" stroke-dasharray=\"4 3\"\/>\n <polygon points=\"460,144 452,139 452,149\" fill=\"#0056C7\"\/>\n <text x=\"420\" y=\"136\" class=\"svg-dim\" text-anchor=\"middle\">forward motion<\/text>\n <\/g>\n\n \n <g transform=\"translate(0, 30)\">\n <g class=\"file-group\" id=\"file-group\">\n <rect x=\"40\" y=\"190\" width=\"60\" height=\"22\" rx=\"4\" fill=\"#E85A24\" stroke=\"#c74a1c\" stroke-width=\"1.5\"\/>\n <rect x=\"42\" y=\"193\" width=\"56\" height=\"4\" fill=\"#ff7a45\"\/>\n <polygon points=\"100,191 280,180 280,222 100,212\" fill=\"#dce6f2\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n <g stroke=\"#5a7ba8\" stroke-width=\"0.6\">\n <line x1=\"110\" y1=\"194\" x2=\"115\" y2=\"202\"\/><line x1=\"118\" y1=\"193\" x2=\"123\" y2=\"201\"\/>\n <line x1=\"126\" y1=\"193\" x2=\"131\" y2=\"201\"\/><line x1=\"134\" y1=\"192\" x2=\"139\" y2=\"200\"\/>\n <line x1=\"142\" y1=\"192\" x2=\"147\" y2=\"200\"\/><line x1=\"150\" y1=\"191\" x2=\"155\" y2=\"199\"\/>\n <line x1=\"158\" y1=\"191\" x2=\"163\" y2=\"199\"\/><line x1=\"166\" y1=\"190\" x2=\"171\" y2=\"198\"\/>\n <line x1=\"174\" y1=\"190\" x2=\"179\" y2=\"198\"\/><line x1=\"182\" y1=\"189\" x2=\"187\" y2=\"197\"\/>\n <line x1=\"190\" y1=\"189\" x2=\"195\" y2=\"197\"\/><line x1=\"198\" y1=\"188\" x2=\"203\" y2=\"196\"\/>\n <line x1=\"206\" y1=\"188\" x2=\"211\" y2=\"196\"\/><line x1=\"214\" y1=\"187\" x2=\"219\" y2=\"195\"\/>\n <line x1=\"222\" y1=\"187\" x2=\"227\" y2=\"195\"\/><line x1=\"230\" y1=\"186\" x2=\"235\" y2=\"194\"\/>\n <line x1=\"238\" y1=\"186\" x2=\"243\" y2=\"194\"\/><line x1=\"246\" y1=\"185\" x2=\"251\" y2=\"193\"\/>\n <line x1=\"254\" y1=\"185\" x2=\"259\" y2=\"193\"\/><line x1=\"262\" y1=\"184\" x2=\"267\" y2=\"192\"\/>\n <line x1=\"110\" y1=\"204\" x2=\"115\" y2=\"212\"\/><line x1=\"118\" y1=\"203\" x2=\"123\" y2=\"211\"\/>\n <line x1=\"126\" y1=\"203\" x2=\"131\" y2=\"211\"\/><line x1=\"134\" y1=\"202\" x2=\"139\" y2=\"210\"\/>\n <line x1=\"142\" y1=\"202\" x2=\"147\" y2=\"210\"\/><line x1=\"150\" y1=\"201\" x2=\"155\" y2=\"209\"\/>\n <line x1=\"158\" y1=\"201\" x2=\"163\" y2=\"209\"\/><line x1=\"166\" y1=\"200\" x2=\"171\" y2=\"208\"\/>\n <line x1=\"174\" y1=\"200\" x2=\"179\" y2=\"208\"\/><line x1=\"182\" y1=\"199\" x2=\"187\" y2=\"207\"\/>\n <line x1=\"190\" y1=\"199\" x2=\"195\" y2=\"207\"\/><line x1=\"198\" y1=\"198\" x2=\"203\" y2=\"206\"\/>\n <line x1=\"206\" y1=\"198\" x2=\"210\" y2=\"206\"\/><line x1=\"214\" y1=\"197\" x2=\"219\" y2=\"205\"\/>\n <line x1=\"222\" y1=\"197\" x2=\"227\" y2=\"205\"\/><line x1=\"230\" y1=\"196\" x2=\"235\" y2=\"204\"\/>\n <line x1=\"238\" y1=\"196\" x2=\"243\" y2=\"204\"\/><line x1=\"246\" y1=\"195\" x2=\"251\" y2=\"203\"\/>\n <line x1=\"254\" y1=\"195\" x2=\"259\" y2=\"203\"\/><line x1=\"262\" y1=\"194\" x2=\"267\" y2=\"202\"\/>\n <\/g>\n <polygon points=\"280,180 295,188 295,214 280,222\" fill=\"#b8c9dd\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n <g class=\"file-spark\">\n <circle cx=\"295\" cy=\"210\" r=\"2\" fill=\"#E85A24\"\/>\n <circle cx=\"305\" cy=\"208\" r=\"1.5\" fill=\"#ff7a45\"\/>\n <circle cx=\"312\" cy=\"214\" r=\"1.2\" fill=\"#ffb380\"\/>\n <line x1=\"295\" y1=\"210\" x2=\"315\" y2=\"202\" stroke=\"#E85A24\" stroke-width=\"0.8\"\/>\n <\/g>\n <\/g>\n <\/g>\n\n \n <g opacity=\"0.7\">\n <text x=\"30\" y=\"262\" class=\"svg-accent\">\u2193 gentle<\/text>\n <text x=\"30\" y=\"275\" class=\"svg-accent\">pressure<\/text>\n <\/g>\n\n \n <text x=\"492\" y=\"275\" class=\"svg-label-bold\">Workpiece (steel)<\/text>\n\n \n <text x=\"340\" y=\"390\" class=\"svg-label\" text-anchor=\"middle\">File Testing \u2014 bite vs. slip comparison<\/text>\n <\/svg>\n <\/div>\n <div class=\"ht-controls\">\n <div class=\"ht-step-indicator\" id=\"step-file\">Pressing file against workpiece…<\/div>\n <\/div>\n <div class=\"ht-info\">\n <h2>File Testing <span class=\"ht-badge\">Method 1<\/span><\/h2>\n <p>\n A hardened file of standardized hardness is lightly pressed against the part and pushed with a\n <strong>slow forward motion<\/strong> over the surface. The tester feels the “bite” or “slip” of the\n file through the fingers. If the file does not bite, the part is considered <em>“file hard”<\/em> \u2014\n as hard as, or harder than, the file itself.\n <\/p>\n <p>\n By using a set of files hardened in five-point increments from <strong>40\u201365 HRC<\/strong>, the operator\n works from a hard file (which bites) down to softer files until one slips. The workpiece hardness lies\n between the file that marks and the file that slips.\n <\/p>\n <div class=\"ht-specs\">\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">File Hardness Range<\/div><div class=\"ht-spec-value\">40 \u2013 65 HRC (5-pt steps)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Motion<\/div><div class=\"ht-spec-value\">Slow, forward, gentle pressure<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Best For<\/div><div class=\"ht-spec-value\">Decarb \/ soft-spot checks, large tools<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Result Type<\/div><div class=\"ht-spec-value\">Comparative (approximate HRC)<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"ht-panel\" id=\"panel-rockwell\">\n <div class=\"ht-stage rockwell-stage\" id=\"rockwell-stage\">\n <svg viewBox=\"0 0 680 420\" width=\"680\" height=\"420\">\n \n <g class=\"load-arrow\">\n <text x=\"352\" y=\"30\" class=\"svg-accent\" text-anchor=\"start\">150 kgf load<\/text>\n <line x1=\"340\" y1=\"26\" x2=\"340\" y2=\"58\" stroke=\"#E85A24\" stroke-width=\"2.5\"\/>\n <polygon points=\"340,66 333,56 347,56\" fill=\"#E85A24\"\/>\n <\/g>\n\n \n <rect x=\"270\" y=\"70\" width=\"140\" height=\"35\" fill=\"#0056C7\" rx=\"4\"\/>\n <rect x=\"330\" y=\"105\" width=\"20\" height=\"28\" fill=\"#003A8C\"\/>\n\n \n <g class=\"rockwell-indenter\" id=\"rockwell-indenter\">\n <rect x=\"322\" y=\"133\" width=\"36\" height=\"42\" fill=\"#8b9cb8\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n <rect x=\"326\" y=\"138\" width=\"28\" height=\"5\" fill=\"#b8c9dd\"\/>\n <polygon points=\"322,175 358,175 345,205 335,205\" fill=\"#dce6f2\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n <polygon points=\"335,205 345,205 340,215\" fill=\"#fff\" stroke=\"#5a7ba8\" stroke-width=\"1.2\"\/>\n <line x1=\"328\" y1=\"177\" x2=\"340\" y2=\"205\" stroke=\"#fff\" stroke-width=\"1\" opacity=\"0.7\"\/>\n <\/g>\n\n \n <text x=\"314\" y=\"163\" class=\"svg-label-bold\" text-anchor=\"end\">Diamond<\/text>\n <text x=\"314\" y=\"176\" class=\"svg-label\" text-anchor=\"end\">Penetrator<\/text>\n <line x1=\"316\" y1=\"170\" x2=\"321\" y2=\"172\" stroke=\"#5a7ba8\" stroke-width=\"0.8\" stroke-dasharray=\"2 2\"\/>\n\n \n <rect x=\"240\" y=\"240\" width=\"200\" height=\"38\" fill=\"#b8c9dd\" stroke=\"#5a7ba8\" stroke-width=\"2\"\/>\n <rect x=\"240\" y=\"240\" width=\"200\" height=\"5\" fill=\"#dce6f2\"\/>\n\n \n <g class=\"rockwell-indent\">\n <polygon points=\"335,240 345,240 340,252\" fill=\"#003A8C\"\/>\n <text x=\"368\" y=\"234\" class=\"svg-accent\">indent<\/text>\n <\/g>\n\n \n <rect x=\"220\" y=\"278\" width=\"240\" height=\"18\" fill=\"#8b9cb8\"\/>\n <rect x=\"220\" y=\"296\" width=\"240\" height=\"42\" fill=\"#5a7ba8\"\/>\n <rect x=\"200\" y=\"338\" width=\"280\" height=\"10\" fill=\"#0056C7\" rx=\"2\"\/>\n\n \n <rect x=\"195\" y=\"105\" width=\"14\" height=\"245\" fill=\"#5a7ba8\"\/>\n <rect x=\"471\" y=\"105\" width=\"14\" height=\"245\" fill=\"#5a7ba8\"\/>\n\n \n <text x=\"340\" y=\"365\" class=\"svg-label-bold\" text-anchor=\"middle\">Anvil<\/text>\n <text x=\"340\" y=\"395\" class=\"svg-label\" text-anchor=\"middle\">Rockwell C Hardness Tester<\/text>\n\n \n <g transform=\"translate(530, 133)\">\n <line x1=\"0\" y1=\"0\" x2=\"0\" y2=\"105\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"-4\" y1=\"0\" x2=\"4\" y2=\"0\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"-4\" y1=\"105\" x2=\"4\" y2=\"105\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"-3\" y1=\"52\" x2=\"3\" y2=\"52\" stroke=\"#0056C7\" stroke-width=\"1\"\/>\n <text x=\"10\" y=\"6\" class=\"svg-dim\">0<\/text>\n <text x=\"10\" y=\"57\" class=\"svg-dim\">depth<\/text>\n <text x=\"10\" y=\"110\" class=\"svg-dim\">max<\/text>\n <text x=\"0\" y=\"128\" class=\"svg-label\" text-anchor=\"middle\">HRC =<\/text>\n <text x=\"0\" y=\"141\" class=\"svg-label\" text-anchor=\"middle\">f(depth)<\/text>\n <\/g>\n <\/svg>\n <\/div>\n <div class=\"ht-controls\">\n <div class=\"ht-step-indicator\" id=\"step-rockwell\">Lowering diamond penetrator<\/div>\n <\/div>\n <div class=\"ht-info\">\n <h2>Rockwell Testing (C Scale) <span class=\"ht-badge\">Method 2<\/span><\/h2>\n <p>\n The Rockwell C scale is the most common hardness test for heat-treated tooling over\n <strong>40 HRC<\/strong>. A <strong>330-lbf (150-kgf) load<\/strong> is pressed into the workpiece\n through a <strong>spheroconical diamond penetrator<\/strong>. The depth of indentation \u2014 not the\n diameter \u2014 is the basis for the Rockwell hardness number.\n <\/p>\n <p>\n Always take at least <strong>four readings<\/strong>; omit the first (seating). If three are within\n \u00b11 HRC, the result can be averaged. Never retest in the same indentation.\n <\/p>\n <div class=\"ht-specs\">\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Load<\/div><div class=\"ht-spec-value\">330 lbf (150 kgf)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Penetrator<\/div><div class=\"ht-spec-value\">Spheroconical diamond (Brale)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Measurement<\/div><div class=\"ht-spec-value\">Depth of indentation \u2192 HRC<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Range<\/div><div class=\"ht-spec-value\">Over 40 HRC (heat-treated tooling)<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"ht-panel\" id=\"panel-brinell\">\n <div class=\"ht-stage brinell-stage\" id=\"brinell-stage\">\n <svg viewBox=\"0 0 680 420\" width=\"680\" height=\"420\">\n \n <text class=\"brinell-step-label s1\" x=\"70\" y=\"32\">\u2460 Apply load<\/text>\n <text class=\"brinell-step-label s2\" x=\"70\" y=\"32\">\u2461 Hold (dwell)<\/text>\n <text class=\"brinell-step-label s3\" x=\"70\" y=\"32\">\u2462 Remove load<\/text>\n <text class=\"brinell-step-label s4\" x=\"70\" y=\"32\">\u2463 Measure diameter<\/text>\n\n \n <g class=\"brinell-load\">\n <text x=\"352\" y=\"40\" class=\"svg-accent\" text-anchor=\"start\">3000 kgf<\/text>\n <line x1=\"340\" y1=\"36\" x2=\"340\" y2=\"68\" stroke=\"#E85A24\" stroke-width=\"2.5\"\/>\n <polygon points=\"340,76 333,66 347,66\" fill=\"#E85A24\"\/>\n <\/g>\n\n \n <rect x=\"270\" y=\"80\" width=\"140\" height=\"35\" fill=\"#0056C7\" rx=\"4\"\/>\n <rect x=\"330\" y=\"115\" width=\"20\" height=\"26\" fill=\"#003A8C\"\/>\n\n \n <rect x=\"322\" y=\"141\" width=\"36\" height=\"36\" fill=\"#8b9cb8\" stroke=\"#5a7ba8\" stroke-width=\"1.5\"\/>\n\n \n <g class=\"brinell-ball\" id=\"brinell-ball\">\n <circle cx=\"340\" cy=\"191\" r=\"14\" fill=\"#0056C7\" stroke=\"#003A8C\" stroke-width=\"1.5\"\/>\n <circle cx=\"336\" cy=\"187\" r=\"4\" fill=\"#00B4E6\" opacity=\"0.7\"\/>\n <\/g>\n \n <text x=\"368\" y=\"186\" class=\"svg-label\">10 mm<\/text>\n <text x=\"368\" y=\"199\" class=\"svg-label\">ball<\/text>\n\n \n <rect x=\"220\" y=\"245\" width=\"240\" height=\"38\" fill=\"#b8c9dd\" stroke=\"#5a7ba8\" stroke-width=\"2\"\/>\n <rect x=\"220\" y=\"245\" width=\"240\" height=\"5\" fill=\"#dce6f2\"\/>\n\n \n <g class=\"brinell-indent\">\n <ellipse cx=\"340\" cy=\"245\" rx=\"18\" ry=\"5\" fill=\"#003A8C\" opacity=\"0.85\"\/>\n <ellipse cx=\"340\" cy=\"245\" rx=\"18\" ry=\"5\" fill=\"none\" stroke=\"#E85A24\" stroke-width=\"1.2\"\/>\n <line x1=\"322\" y1=\"235\" x2=\"358\" y2=\"235\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"322\" y1=\"231\" x2=\"322\" y2=\"239\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <line x1=\"358\" y1=\"231\" x2=\"358\" y2=\"239\" stroke=\"#0056C7\" stroke-width=\"1.5\"\/>\n <text x=\"340\" y=\"227\" class=\"svg-dim\" text-anchor=\"middle\">d (diameter)<\/text>\n <\/g>\n\n \n <g class=\"brinell-microscope\" id=\"brinell-microscope\">\n <rect x=\"270\" y=\"160\" width=\"18\" height=\"50\" fill=\"#0056C7\" rx=\"2\"\/>\n <rect x=\"266\" y=\"210\" width=\"26\" height=\"8\" fill=\"#5a7ba8\"\/>\n <polygon points=\"279,218 287,245 271,245\" fill=\"#003A8C\"\/>\n <rect x=\"275\" y=\"140\" width=\"8\" height=\"20\" fill=\"#8b9cb8\"\/>\n <ellipse cx=\"279\" cy=\"140\" rx=\"7\" ry=\"3\" fill=\"#0056C7\"\/>\n <text x=\"262\" y=\"165\" class=\"svg-label\" text-anchor=\"end\">Measuring<\/text>\n <text x=\"262\" y=\"178\" class=\"svg-label\" text-anchor=\"end\">Microscope<\/text>\n <text x=\"262\" y=\"191\" class=\"svg-dim\" text-anchor=\"end\">\u00b10.005 mm<\/text>\n <\/g>\n\n \n <rect x=\"200\" y=\"283\" width=\"280\" height=\"18\" fill=\"#8b9cb8\"\/>\n <rect x=\"200\" y=\"301\" width=\"280\" height=\"42\" fill=\"#5a7ba8\"\/>\n <rect x=\"180\" y=\"343\" width=\"320\" height=\"10\" fill=\"#0056C7\" rx=\"2\"\/>\n\n \n <text x=\"340\" y=\"370\" class=\"svg-label-bold\" text-anchor=\"middle\">Anvil<\/text>\n <text x=\"340\" y=\"395\" class=\"svg-label\" text-anchor=\"middle\">Brinell Hardness Tester \u2014 4-step process<\/text>\n <\/svg>\n <\/div>\n <div class=\"ht-controls\">\n <div class=\"ht-step-indicator\" id=\"step-brinell\">\u2460 Ball pressing into surface (3000 kgf)<\/div>\n <\/div>\n <div class=\"ht-info\">\n <h2>Brinell Testing <span class=\"ht-badge\">Method 3<\/span><\/h2>\n <p>\n The Brinell test forces a <strong>hard ball<\/strong> (10-mm \/ 0.39-in. diameter) under a specified load\n \u2014 typically <strong>6,600 lbf (3,000 kgf)<\/strong> \u2014 into the surface of the material. After the load\n is removed, the <strong>diameter of the impression<\/strong> is measured with a measuring microscope\n (graduated to 0.005 mm) and converted into a Brinell hardness number (HB).\n <\/p>\n <p>\n Best suited for material in the <strong>annealed or low-hardness range (\u2264 375 HB)<\/strong>. Material\n over 375 HB (\u2248 40 HRC) should be tested with Rockwell C instead.\n <\/p>\n <ol class=\"ht-steps\">\n <li><strong>Apply load:<\/strong> Ball is pressed into the surface under 3,000 kgf.<\/li>\n <li><strong>Hold (dwell):<\/strong> Load is maintained to form a full impression.<\/li>\n <li><strong>Remove load:<\/strong> Ball is retracted, leaving a spherical indentation.<\/li>\n <li><strong>Measure:<\/strong> Diameter of impression is read with a microscope \u2192 converted to HB.<\/li>\n <\/ol>\n <div class=\"ht-specs\">\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Ball Diameter<\/div><div class=\"ht-spec-value\">10 mm (0.39 in.)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Standard Load<\/div><div class=\"ht-spec-value\">6,600 lbf (3,000 kgf)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Ball Material<\/div><div class=\"ht-spec-value\">Steel (\u2264450 HB) \/ Tungsten-Carbide (harder)<\/div><\/div>\n <div class=\"ht-spec\"><div class=\"ht-spec-label\">Measurement<\/div><div class=\"ht-spec-value\">Diameter of impression \u2192 HB number<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n<script>\n var stepRefs = {\n file: { stepEl: 'step-file', cycle: 3200 },\n rockwell: { stepEl: 'step-rockwell', cycle: 3600 },\n brinell: { stepEl: 'step-brinell', cycle: 6000 }\n };\n var messages = {\n file: [\n 'Pressing file against workpiece...',\n 'Forward stroke \u2014 feeling the bite',\n 'File marks the surface',\n 'Returning \u2014 try softer file next'\n ],\n rockwell: [\n 'Lowering diamond penetrator',\n 'Applying 150 kgf load',\n 'Measuring indentation depth',\n 'Retracting \u2014 reading HRC value'\n ],\n brinell: [\n '\u2460 Ball pressing into surface (3000 kgf)',\n '\u2461 Holding load \u2014 dwelling',\n '\u2462 Removing load \u2014 impression left',\n '\u2463 Measuring diameter with microscope'\n ]\n };\n\n function showPanel(name, btn) {\n var panels = document.querySelectorAll('.ht-panel');\n for (var i = 0; i < panels.length; i++) panels[i].classList.remove('active');\n var tabs = document.querySelectorAll('.ht-tab');\n for (var j = 0; j < tabs.length; j++) tabs[j].classList.remove('active');\n document.getElementById('panel-' + name).classList.add('active');\n if (btn) btn.classList.add('active');\n }\n\n function startStepCycle(name) {\n var ref = stepRefs[name];\n var stepEl = document.getElementById(ref.stepEl);\n if (!stepEl) return;\n var msgs = messages[name];\n var i = 0;\n stepEl.textContent = msgs[0];\n i = 1;\n setInterval(function() {\n stepEl.textContent = msgs[i % msgs.length];\n i++;\n }, ref.cycle \/ msgs.length);\n }\n\n \/\/ Start step cycles for all panels on load\n function init() {\n for (var name in stepRefs) {\n startStepCycle(name);\n }\n }\n\n if (document.readyState === 'loading') {\n document.addEventListener('DOMContentLoaded', init);\n } else {\n init();\n }\n<\/script>\n<\/body>\n<\/html>\n\n\n\n\n<ul class=\"wp-block-yoast-seo-related-links yoast-seo-related-links\">\n<li><a href=\"https:\/\/aobosteel.com\/tool-steel-hardness-conversion-calculator\/\">Tool Steel Hardness Conversion Calculator (HRC, HV, HBW, HRB)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/tool-steel-quality-verification\/\">How to Verify Tool Steel Quality Before Bulk Purchase<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/tool-steel-equivalent-grades\/\">Equivalent grades finder<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Hardness Testing Methods – Animated Demonstration Hardness Testing Methods Animated demonstration of three workshop hardness tests FILE TESTING ROCKWELL TESTING BRINELL TESTING Hardened File (known HRC) forward motion \u2193 gentle pressure Workpiece (steel) File Testing \u2014 bite vs. slip comparison Pressing file against workpiece… File Testing Method 1 A hardened file of standardized hardness is […]<\/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":"normal-width-container","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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