{"id":21516,"date":"2026-10-09T23:04:23","date_gmt":"2026-10-09T15:04:23","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=21516"},"modified":"2026-10-09T23:04:46","modified_gmt":"2026-10-09T15:04:46","slug":"iso-4957-tool-steel-grades","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/iso-4957-tool-steel-grades\/","title":{"rendered":"Graus de a\u00e7o ferramenta ISO 4957: composi\u00e7\u00e3o, dureza e equivalentes"},"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    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!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 | International Standard | ISO 4957<\/div>\n<h1 style=\"--h1-max:38px\">ISO 4957 Tool Steel Grades: Composition, Hardness and Equivalents<\/h1>\n<p>ISO 4957 is the international standard for tool steels. It names every grade itself instead of using the American AISI letter system, so a buyer who writes it on an enquiry writes names like X40CrMoV5-1 and HS6-5-2, and a supplier answers with the DIN number or the AISI grade. This page lists all 48 grades of ISO 4957:1999, grouped into its four families, with the specified composition range, the European EN 10027-2 number and the comparable JIS grade, followed by the annealed and hardened hardness and the hardening schedule the standard gives for each one.<\/p>\n<\/div>\n<\/div>\n\n<div class=\"ts-tool-area\">\n\n<h2 class=\"ts-h2\">The four families of ISO 4957<\/h2>\n<p class=\"ts-p\">ISO 4957 sorts tool steels by end use rather than by chemistry alone. The four families are non-alloy cold-work, alloy cold-work, alloy hot-work and high-speed tool steels. The dividing line between cold work and hot work is a working temperature, below or above about 200 &deg;C, and the high-speed grades are the ones that hold their hardness up to roughly 600 &deg;C. Anything the standard does not recognise as one of the four families is simply not an ISO 4957 tool steel.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:20%\">Family<\/th>\n<th style=\"width:10%\">Grades<\/th>\n<th style=\"width:16%\">Carbon, %<\/th>\n<th>Where it is used<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-num\">Non-alloy cold-work<\/td><td class=\"ts-num\">6<\/td><td class=\"ts-num\">0.42-1.25<\/td><td class=\"ts-num\">Hand tools, gauges, woodworking and other low-temperature cutting that does not need alloy carbides.<\/td><\/tr>\n<tr><td class=\"ts-num\">Alloy cold-work<\/td><td class=\"ts-num\">17<\/td><td class=\"ts-num\">0.18-2.30<\/td><td class=\"ts-num\">Blanking and forming dies, cold extrusion, thread rolling, and the P series plastic mold cavities and holders.<\/td><\/tr>\n<tr><td class=\"ts-num\">Alloy hot-work<\/td><td class=\"ts-num\">9<\/td><td class=\"ts-num\">0.25-0.60<\/td><td class=\"ts-num\">Die casting dies and cores, forging and extrusion tooling, hot shear blades, and holders that run hot.<\/td><\/tr>\n<tr><td class=\"ts-num\">High-speed<\/td><td class=\"ts-num\">16<\/td><td class=\"ts-num\">0.73-1.40<\/td><td class=\"ts-num\">Drills, taps, milling cutters, hobs, broaches and saws, where hardness has to hold up to about 600 &deg;C.<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>Grade counts and carbon ranges as set by ISO 4957:1999. The carbon range is the span across the family, not the range of any one grade.<\/em><\/p>\n\n<h2 class=\"ts-h2\">Chemical composition of the ISO 4957 grades<\/h2>\n<p class=\"ts-p\">Table 1 of the standard gives a composition range for every grade, together with the German EN 10027-2 number and the nearest Japanese JIS grade. The ranges are the specification limits, so a heat that sits anywhere inside them is to the standard. Where a cell is empty the element is not specified for that grade.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:16%\">Steel name<\/th>\n<th style=\"width:8%\">C<\/th>\n<th style=\"width:7%\">Si<\/th>\n<th style=\"width:7%\">Mn<\/th>\n<th style=\"width:8%\">Cr<\/th>\n<th style=\"width:7%\">Mo<\/th>\n<th style=\"width:7%\">Ni<\/th>\n<th style=\"width:7%\">V<\/th>\n<th style=\"width:8%\">W<\/th>\n<th style=\"width:7%\">Co<\/th>\n<th style=\"width:9%\">EN 10027-2:1992<\/th>\n<th style=\"width:9%\">JIS<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"ts-group\"><td colspan=\"12\">Non-alloy cold-work tool steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">C45U<\/td><td class=\"ts-num\">0.42-0.50<\/td><td class=\"ts-num\">0.15-0.40<\/td><td class=\"ts-num\">0.60-0.80<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.1730<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">C70U<\/td><td class=\"ts-num\">0.65-0.75<\/td><td class=\"ts-num\">0.10-0.30<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.1520<\/td><td class=\"ts-num\">SK7<\/td><\/tr>\n<tr><td class=\"ts-grade\">C80U<\/td><td class=\"ts-num\">0.75-0.85<\/td><td class=\"ts-num\">0.10-0.30<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.1525<\/td><td class=\"ts-num\">SK6<\/td><\/tr>\n<tr><td class=\"ts-grade\">C90U<\/td><td class=\"ts-num\">0.85-0.95<\/td><td class=\"ts-num\">0.10-0.30<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.1535<\/td><td class=\"ts-num\">SK5, SK4<\/td><\/tr>\n<tr><td class=\"ts-grade\">C105U<\/td><td class=\"ts-num\">1.00-1.10<\/td><td class=\"ts-num\">0.10-0.30<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.1545<\/td><td class=\"ts-num\">SK3<\/td><\/tr>\n<tr><td class=\"ts-grade\">C120U<\/td><td class=\"ts-num\">1.15-1.25<\/td><td class=\"ts-num\">0.10-0.30<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.1555<\/td><td class=\"ts-num\">SK2<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"12\">Alloy cold-work tool steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">105V<\/td><td class=\"ts-num\">1.00-1.10<\/td><td class=\"ts-num\">0.10-0.30<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.10-0.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2834<\/td><td class=\"ts-num\">SKS43<\/td><\/tr>\n<tr><td class=\"ts-grade\">50WCrV8<\/td><td class=\"ts-num\">0.45-0.55<\/td><td class=\"ts-num\">0.70-1.00<\/td><td class=\"ts-num\">0.15-0.45<\/td><td class=\"ts-num\">0.90-1.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.10-0.20<\/td><td class=\"ts-num\">1.70-2.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2549<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">60WCrV8<\/td><td class=\"ts-num\">0.55-0.65<\/td><td class=\"ts-num\">0.70-1.00<\/td><td class=\"ts-num\">0.15-0.45<\/td><td class=\"ts-num\">0.90-1.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.10-0.20<\/td><td class=\"ts-num\">1.70-2.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2550<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">102Cr6<\/td><td class=\"ts-num\">0.95-1.10<\/td><td class=\"ts-num\">0.15-0.35<\/td><td class=\"ts-num\">0.25-0.45<\/td><td class=\"ts-num\">1.35-1.65<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2067<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">21MnCr5<\/td><td class=\"ts-num\">0.18-0.24<\/td><td class=\"ts-num\">0.15-0.35<\/td><td class=\"ts-num\">1.10-1.40<\/td><td class=\"ts-num\">1.00-1.30<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2162<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">70MnMoCr8<\/td><td class=\"ts-num\">0.65-0.75<\/td><td class=\"ts-num\">0.10-0.50<\/td><td class=\"ts-num\">1.80-2.50<\/td><td class=\"ts-num\">0.90-1.20<\/td><td class=\"ts-num\">0.90-1.40<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2824<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">90MnCrV8<\/td><td class=\"ts-num\">0.85-0.95<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">1.80-2.20<\/td><td class=\"ts-num\">0.20-0.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.05-0.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2842<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">95MnWCr5<\/td><td class=\"ts-num\">0.90-1.00<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">1.05-1.35<\/td><td class=\"ts-num\">0.40-0.65<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.05-0.20<\/td><td class=\"ts-num\">0.40-0.70<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2825<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">X100CrMoV5<\/td><td class=\"ts-num\">0.95-1.05<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">0.40-0.80<\/td><td class=\"ts-num\">4.80-5.50<\/td><td class=\"ts-num\">0.90-1.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.15-0.35<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2363<\/td><td class=\"ts-num\">SKD12<\/td><\/tr>\n<tr><td class=\"ts-grade\">X153CrMoV12<\/td><td class=\"ts-num\">1.45-1.60<\/td><td class=\"ts-num\">0.10-0.60<\/td><td class=\"ts-num\">0.20-0.60<\/td><td class=\"ts-num\">11.00-13.00<\/td><td class=\"ts-num\">0.70-1.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.70-1.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2379<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">X210Cr12<\/td><td class=\"ts-num\">1.90-2.20<\/td><td class=\"ts-num\">0.10-0.60<\/td><td class=\"ts-num\">0.20-0.60<\/td><td class=\"ts-num\">11.00-13.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2080<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">X210CrW12<\/td><td class=\"ts-num\">2.00-2.30<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">0.30-0.60<\/td><td class=\"ts-num\">11.00-13.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.60-0.80<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2436<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">35CrMo7<\/td><td class=\"ts-num\">0.30-0.40<\/td><td class=\"ts-num\">0.30-0.70<\/td><td class=\"ts-num\">0.60-1.00<\/td><td class=\"ts-num\">1.50-2.00<\/td><td class=\"ts-num\">0.35-0.55<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2302<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">40CrMnNiMo8-6-4<\/td><td class=\"ts-num\">0.35-0.45<\/td><td class=\"ts-num\">0.20-0.40<\/td><td class=\"ts-num\">1.30-1.60<\/td><td class=\"ts-num\">1.80-2.10<\/td><td class=\"ts-num\">0.15-0.25<\/td><td class=\"ts-num\">0.90-1.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2738<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">45NiCrMo16<\/td><td class=\"ts-num\">0.40-0.50<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">0.20-0.50<\/td><td class=\"ts-num\">1.20-1.50<\/td><td class=\"ts-num\">0.15-0.35<\/td><td class=\"ts-num\">3.80-4.30<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2767<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">X40Cr14<\/td><td class=\"ts-num\">0.36-0.42<\/td><td class=\"ts-num\">1.00 max<\/td><td class=\"ts-num\">1.00 max<\/td><td class=\"ts-num\">12.50-14.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2083<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">X38CrMo16<\/td><td class=\"ts-num\">0.33-0.45<\/td><td class=\"ts-num\">1.00 max<\/td><td class=\"ts-num\">1.00 max<\/td><td class=\"ts-num\">15.50-17.50<\/td><td class=\"ts-num\">0.80-1.30<\/td><td class=\"ts-num\">1.00 max<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2316<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"12\">Alloy hot-work tool steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">55NiCrMoV7<\/td><td class=\"ts-num\">0.50-0.60<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">0.60-0.90<\/td><td class=\"ts-num\">0.80-1.20<\/td><td class=\"ts-num\">0.35-0.55<\/td><td class=\"ts-num\">1.50-1.80<\/td><td class=\"ts-num\">0.05-0.15<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2714<\/td><td class=\"ts-num\">SKT4<\/td><\/tr>\n<tr><td class=\"ts-grade\">32CrMoV12-28<\/td><td class=\"ts-num\">0.28-0.35<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">0.15-0.45<\/td><td class=\"ts-num\">2.70-3.20<\/td><td class=\"ts-num\">2.50-3.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.40-0.70<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2365<\/td><td class=\"ts-num\">SKD7<\/td><\/tr>\n<tr><td class=\"ts-grade\">X37CrMoV5-1<\/td><td class=\"ts-num\">0.33-0.41<\/td><td class=\"ts-num\">0.80-1.20<\/td><td class=\"ts-num\">0.25-0.50<\/td><td class=\"ts-num\">4.80-5.20<\/td><td class=\"ts-num\">1.10-1.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.30-0.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2343<\/td><td class=\"ts-num\">SKD6<\/td><\/tr>\n<tr><td class=\"ts-grade\">X38CrMoV5-3<\/td><td class=\"ts-num\">0.35-0.40<\/td><td class=\"ts-num\">0.30-0.50<\/td><td class=\"ts-num\">0.30-0.50<\/td><td class=\"ts-num\">4.80-5.20<\/td><td class=\"ts-num\">2.70-3.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.40-0.60<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2367<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">X40CrMoV5-1<\/td><td class=\"ts-num\">0.35-0.42<\/td><td class=\"ts-num\">0.80-1.20<\/td><td class=\"ts-num\">0.25-0.50<\/td><td class=\"ts-num\">4.80-5.50<\/td><td class=\"ts-num\">1.20-1.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.85-1.15<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2344<\/td><td class=\"ts-num\">SKD61<\/td><\/tr>\n<tr><td class=\"ts-grade\">50CrMoV13-15<\/td><td class=\"ts-num\">0.45-0.55<\/td><td class=\"ts-num\">0.20-0.80<\/td><td class=\"ts-num\">0.50-0.90<\/td><td class=\"ts-num\">3.00-3.50<\/td><td class=\"ts-num\">1.30-1.70<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.15-0.35<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2355<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">X30WCrV9-3<\/td><td class=\"ts-num\">0.25-0.35<\/td><td class=\"ts-num\">0.10-0.40<\/td><td class=\"ts-num\">0.15-0.45<\/td><td class=\"ts-num\">2.50-3.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.30-0.50<\/td><td class=\"ts-num\">8.50-9.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2581<\/td><td class=\"ts-num\">SKD5<\/td><\/tr>\n<tr><td class=\"ts-grade\">X35CrWMoV5<\/td><td class=\"ts-num\">0.32-0.40<\/td><td class=\"ts-num\">0.80-1.20<\/td><td class=\"ts-num\">0.20-0.50<\/td><td class=\"ts-num\">4.75-5.50<\/td><td class=\"ts-num\">1.25-1.60<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.20-0.50<\/td><td class=\"ts-num\">1.10-1.60<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.2605<\/td><td class=\"ts-num\">SKD62<\/td><\/tr>\n<tr><td class=\"ts-grade\">38CrCoWV18-17-17<\/td><td class=\"ts-num\">0.35-0.45<\/td><td class=\"ts-num\">0.15-0.50<\/td><td class=\"ts-num\">0.20-0.50<\/td><td class=\"ts-num\">4.00-4.70<\/td><td class=\"ts-num\">0.30-0.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.70-2.10<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">4.00-4.50<\/td><td class=\"ts-num\">1.2661<\/td><td class=\"ts-num\">SKD8<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"12\">High-speed tool steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS0-4-1<\/td><td class=\"ts-num\">0.77-0.85<\/td><td class=\"ts-num\">0.65 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.90-4.40<\/td><td class=\"ts-num\">4.00-4.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.90-1.10<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3325<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS1-4-2<\/td><td class=\"ts-num\">0.85-0.95<\/td><td class=\"ts-num\">0.65 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.60-4.30<\/td><td class=\"ts-num\">4.10-4.80<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.70-2.20<\/td><td class=\"ts-num\">0.80-1.40<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3326<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS18-0-1<\/td><td class=\"ts-num\">0.73-0.83<\/td><td class=\"ts-num\">0.45 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.00-1.20<\/td><td class=\"ts-num\">17.20-18.70<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3355<\/td><td class=\"ts-num\">SKH2<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS2-9-2<\/td><td class=\"ts-num\">0.95-1.05<\/td><td class=\"ts-num\">0.70 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.50-4.50<\/td><td class=\"ts-num\">8.20-9.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.70-2.20<\/td><td class=\"ts-num\">1.50-2.10<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3348<\/td><td class=\"ts-num\">SKH58<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS1-8-1<\/td><td class=\"ts-num\">0.77-0.87<\/td><td class=\"ts-num\">0.70 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.50-4.50<\/td><td class=\"ts-num\">8.00-9.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.00-1.40<\/td><td class=\"ts-num\">1.40-2.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3327<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS3-3-2<\/td><td class=\"ts-num\">0.95-1.03<\/td><td class=\"ts-num\">0.45 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">2.50-2.90<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">2.20-2.50<\/td><td class=\"ts-num\">2.70-3.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3333<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-2<\/td><td class=\"ts-num\">0.80-0.88<\/td><td class=\"ts-num\">0.45 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">4.70-5.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.70-2.10<\/td><td class=\"ts-num\">5.90-6.70<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3339<\/td><td class=\"ts-num\">SKH51<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-2C<\/td><td class=\"ts-num\">0.86-0.94<\/td><td class=\"ts-num\">0.45 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">4.70-5.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.70-2.10<\/td><td class=\"ts-num\">5.90-6.70<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3343<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-3<\/td><td class=\"ts-num\">1.15-1.25<\/td><td class=\"ts-num\">0.45 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">4.70-5.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">2.70-3.20<\/td><td class=\"ts-num\">5.90-6.70<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3344<\/td><td class=\"ts-num\">SKH53<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-3C<\/td><td class=\"ts-num\">1.25-1.32<\/td><td class=\"ts-num\">0.70 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">4.70-5.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">2.70-3.20<\/td><td class=\"ts-num\">5.90-6.70<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3345<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-6-2<\/td><td class=\"ts-num\">1.00-1.10<\/td><td class=\"ts-num\">0.45 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">5.50-6.50<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">2.30-2.60<\/td><td class=\"ts-num\">5.90-6.70<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3350<\/td><td class=\"ts-num\">SKH52<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-4<\/td><td class=\"ts-num\">1.25-1.40<\/td><td class=\"ts-num\">0.45 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">4.20-5.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">3.70-4.20<\/td><td class=\"ts-num\">5.20-6.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.3351<\/td><td class=\"ts-num\">SKH54<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-2-5<\/td><td class=\"ts-num\">0.87-0.95<\/td><td class=\"ts-num\">0.45 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">4.70-5.20<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">1.70-2.10<\/td><td class=\"ts-num\">5.90-6.70<\/td><td class=\"ts-num\">4.50-5.00<\/td><td class=\"ts-num\">1.3243<\/td><td class=\"ts-num\">SKH55<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-3-8<\/td><td class=\"ts-num\">1.23-1.33<\/td><td class=\"ts-num\">0.70 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">4.70-5.30<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">2.70-3.20<\/td><td class=\"ts-num\">5.90-6.70<\/td><td class=\"ts-num\">8.00-8.80<\/td><td class=\"ts-num\">1.3244<\/td><td class=\"ts-num\">&mdash;<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS10-4-3-10<\/td><td class=\"ts-num\">1.20-1.35<\/td><td class=\"ts-num\">0.45 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">3.20-3.90<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">3.00-3.50<\/td><td class=\"ts-num\">9.00-10.00<\/td><td class=\"ts-num\">9.50-10.50<\/td><td class=\"ts-num\">1.3207<\/td><td class=\"ts-num\">SKH57<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS2-9-1-8<\/td><td class=\"ts-num\">1.05-1.15<\/td><td class=\"ts-num\">0.70 max<\/td><td class=\"ts-num\">0.40 max<\/td><td class=\"ts-num\">3.80-4.50<\/td><td class=\"ts-num\">9.00-10.00<\/td><td class=\"ts-num\">&mdash;<\/td><td class=\"ts-num\">0.90-1.30<\/td><td class=\"ts-num\">1.20-1.90<\/td><td class=\"ts-num\">7.50-8.50<\/td><td class=\"ts-num\">1.3247<\/td><td class=\"ts-num\">SKH59<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>Chemical composition of tool steels to ISO 4957:1999, with the comparable EN 10027-2:1992 and JIS grades, reproduced from Table 1 of the standard. Values are percent by mass. The JIS column is blank where the standard lists no direct comparable.<\/em><\/p>\n<div class=\"ts-notes\">\n<p class=\"ts-p\"><span class=\"ts-sup\">a<\/span> For all steels, phosphorus 0.030% max and sulfur 0.030% max.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">b<\/span> By agreement, sulfur may be increased to between 0.050% and 0.100%, and Ni may be omitted.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">c<\/span> For all steels, unless otherwise specified, phosphorus 0.030% max and sulfur 0.020% max.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">d<\/span> The sulfur content for this grade is 0.030% max.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">e<\/span> A sulfur range of 0.060-0.150% may be agreed at the time of enquiry and order for this grade, in which case a maximum of 0.8% Mn applies.<\/p>\n<\/div>\n\n<h2 class=\"ts-h2\">Hardness and hardening schedule of the ISO 4957 grades<\/h2>\n<p class=\"ts-p\">Table 2 of the standard pairs each grade with the hardness its heat treatment develops. The annealed hardness is given as a maximum in HB, and the hardened hardness as a minimum in HRC, with the hardening temperature, the quenching medium and the tempering temperature that produce it. The hardened hardness is the figure to quote when a drawing calls up a working hardness.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:20%\">Steel name<\/th>\n<th style=\"width:13%\">Annealed hardness, HB max<\/th>\n<th style=\"width:17%\">Hardening temperature, &deg;C (&plusmn;10)<\/th>\n<th style=\"width:12%\">Quenching medium<\/th>\n<th style=\"width:18%\">Tempering temperature, &deg;C (&plusmn;10)<\/th>\n<th style=\"width:12%\">Hardness, HRC min.<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"ts-group\"><td colspan=\"6\">Non-alloy cold-work tool steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">C45U<\/td><td class=\"ts-num\">207<span class=\"ts-sup\">c<\/span><\/td><td class=\"ts-num\">810<\/td><td class=\"ts-num\">W<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">54<\/td><\/tr>\n<tr><td class=\"ts-grade\">C70U<span class=\"ts-sup\">d<\/span><\/td><td class=\"ts-num\">183<\/td><td class=\"ts-num\">800<\/td><td class=\"ts-num\">W<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">57<\/td><\/tr>\n<tr><td class=\"ts-grade\">C80U<span class=\"ts-sup\">d<\/span><\/td><td class=\"ts-num\">192<\/td><td class=\"ts-num\">790<\/td><td class=\"ts-num\">W<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">58<\/td><\/tr>\n<tr><td class=\"ts-grade\">C90U<span class=\"ts-sup\">d<\/span><\/td><td class=\"ts-num\">207<\/td><td class=\"ts-num\">780<\/td><td class=\"ts-num\">W<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">60<\/td><\/tr>\n<tr><td class=\"ts-grade\">C105U<span class=\"ts-sup\">d<\/span><\/td><td class=\"ts-num\">212<\/td><td class=\"ts-num\">780<\/td><td class=\"ts-num\">W<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">61<\/td><\/tr>\n<tr><td class=\"ts-grade\">C120U<span class=\"ts-sup\">d<\/span><\/td><td class=\"ts-num\">217<\/td><td class=\"ts-num\">770<\/td><td class=\"ts-num\">W<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">62<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"6\">Alloy cold-work tool steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">105V<\/td><td class=\"ts-num\">212<\/td><td class=\"ts-num\">790<\/td><td class=\"ts-num\">W<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">61<\/td><\/tr>\n<tr><td class=\"ts-grade\">50WCrV8<\/td><td class=\"ts-num\">229<\/td><td class=\"ts-num\">920<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">56<\/td><\/tr>\n<tr><td class=\"ts-grade\">60WCrV8<\/td><td class=\"ts-num\">229<\/td><td class=\"ts-num\">910<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">58<\/td><\/tr>\n<tr><td class=\"ts-grade\">102Cr6<\/td><td class=\"ts-num\">223<\/td><td class=\"ts-num\">840<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">60<\/td><\/tr>\n<tr><td class=\"ts-grade\">21MnCr5<\/td><td class=\"ts-num\">217<span class=\"ts-sup\">e<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">e<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">e<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">e<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">e<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">70MnMoCr8<\/td><td class=\"ts-num\">248<\/td><td class=\"ts-num\">835<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">58<\/td><\/tr>\n<tr><td class=\"ts-grade\">90MnCrV8<\/td><td class=\"ts-num\">229<\/td><td class=\"ts-num\">790<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">60<\/td><\/tr>\n<tr><td class=\"ts-grade\">95MnWCr5<\/td><td class=\"ts-num\">229<\/td><td class=\"ts-num\">800<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">60<\/td><\/tr>\n<tr><td class=\"ts-grade\">X100CrMoV5<\/td><td class=\"ts-num\">241<\/td><td class=\"ts-num\">970<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">60<\/td><\/tr>\n<tr><td class=\"ts-grade\">X153CrMoV12<\/td><td class=\"ts-num\">255<\/td><td class=\"ts-num\">1020<\/td><td class=\"ts-num\">A<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">61<\/td><\/tr>\n<tr><td class=\"ts-grade\">X210Cr12<\/td><td class=\"ts-num\">248<\/td><td class=\"ts-num\">970<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">62<\/td><\/tr>\n<tr><td class=\"ts-grade\">X210CrW12<\/td><td class=\"ts-num\">255<\/td><td class=\"ts-num\">970<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">62<\/td><\/tr>\n<tr><td class=\"ts-grade\">35CrMo7<span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">40CrMnNiMo8-6-4<span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">45NiCrMo16<\/td><td class=\"ts-num\">285<\/td><td class=\"ts-num\">850<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">52<\/td><\/tr>\n<tr><td class=\"ts-grade\">X40Cr14<span class=\"ts-sup\">g<\/span><\/td><td class=\"ts-num\">241<\/td><td class=\"ts-num\">1010<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">180<\/td><td class=\"ts-num\">52<\/td><\/tr>\n<tr><td class=\"ts-grade\">X38CrMo16<span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><td class=\"ts-num\"><span class=\"ts-sup\">f<\/span><\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"6\">Alloy hot-work tool steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">55NiCrMoV7<\/td><td class=\"ts-num\">248<span class=\"ts-sup\">h<\/span><\/td><td class=\"ts-num\">850<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">500<\/td><td class=\"ts-num\">42<span class=\"ts-sup\">i<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">32CrMoV12-28<\/td><td class=\"ts-num\">229<\/td><td class=\"ts-num\">1,040<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">550<\/td><td class=\"ts-num\">46<\/td><\/tr>\n<tr><td class=\"ts-grade\">X37CrMoV5-1<\/td><td class=\"ts-num\">229<\/td><td class=\"ts-num\">1,020<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">550<\/td><td class=\"ts-num\">48<\/td><\/tr>\n<tr><td class=\"ts-grade\">X38CrMoV5-3<\/td><td class=\"ts-num\">229<\/td><td class=\"ts-num\">1,040<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">550<\/td><td class=\"ts-num\">50<\/td><\/tr>\n<tr><td class=\"ts-grade\">X40CrMoV5-1<\/td><td class=\"ts-num\">229<\/td><td class=\"ts-num\">1,020<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">550<\/td><td class=\"ts-num\">50<\/td><\/tr>\n<tr><td class=\"ts-grade\">50CrMoV13-15<\/td><td class=\"ts-num\">248<\/td><td class=\"ts-num\">1,010<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">510<\/td><td class=\"ts-num\">56<\/td><\/tr>\n<tr><td class=\"ts-grade\">X30WCrV9-3<\/td><td class=\"ts-num\">241<\/td><td class=\"ts-num\">1,150<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">600<\/td><td class=\"ts-num\">48<\/td><\/tr>\n<tr><td class=\"ts-grade\">X35CrWMoV5<\/td><td class=\"ts-num\">229<\/td><td class=\"ts-num\">1,020<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">550<\/td><td class=\"ts-num\">48<\/td><\/tr>\n<tr><td class=\"ts-grade\">38CrCoWV18-17-17<\/td><td class=\"ts-num\">260<\/td><td class=\"ts-num\">1,120<\/td><td class=\"ts-num\">O<\/td><td class=\"ts-num\">600<\/td><td class=\"ts-num\">48<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"6\">High-speed tool steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS0-4-1<\/td><td class=\"ts-num\">262<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,120<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">60<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS1-4-2<\/td><td class=\"ts-num\">262<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,180<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">63<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS18-0-1<\/td><td class=\"ts-num\">269<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,260<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">63<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS2-9-2<\/td><td class=\"ts-num\">269<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,200<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">64<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS1-8-1<\/td><td class=\"ts-num\">262<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,190<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">63<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS3-3-2<\/td><td class=\"ts-num\">255<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,190<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">62<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-2<\/td><td class=\"ts-num\">262<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,220<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">64<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-2C<\/td><td class=\"ts-num\">269<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,210<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">64<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-3<\/td><td class=\"ts-num\">269<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,200<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">64<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-3C<\/td><td class=\"ts-num\">269<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,180<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">64<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-6-2<\/td><td class=\"ts-num\">262<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,200<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">64<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-4<\/td><td class=\"ts-num\">269<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,210<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">64<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-2-5<\/td><td class=\"ts-num\">269<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,210<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">64<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-3-8<\/td><td class=\"ts-num\">302<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,180<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">65<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS10-4-3-10<\/td><td class=\"ts-num\">302<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,230<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">560<\/td><td class=\"ts-num\">66<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS2-9-1-8<\/td><td class=\"ts-num\">277<span class=\"ts-sup\">j<\/span><\/td><td class=\"ts-num\">1,190<\/td><td class=\"ts-num\">O<span class=\"ts-sup\">k<\/span><\/td><td class=\"ts-num\">550<\/td><td class=\"ts-num\">66<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>Hardness and hardening method for tool steels to ISO 4957:1999, reproduced from Table 2 of the standard. The quenching medium letters are air, oil and water; the tempering temperature is a guide to the schedule that reaches the listed minimum hardness, and a higher or lower temper moves the hardness of the work.<\/em><\/p>\n<div class=\"ts-notes\">\n<p class=\"ts-p\"><span class=\"ts-sup\">a<\/span> Hardness in the cold drawn condition may be 20 HB higher than in the annealed condition.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">b<\/span> Quenching medium is A for air, O for oil and W for water.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">c<\/span> This grade is used in the non-heat-treated condition.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">d<\/span> Steels C70U to C120U are, because of their chemical composition, shallow hardening steels. For diameters of 30 mm the hardness penetration depth is about 3 mm; through-hardening is only achieved in diameters up to 10 mm.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">e<\/span> This material, when carburized, quenched and tempered, should reach a surface hardness of 60 HRC.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">f<\/span> This steel is normally supplied in the quenched and tempered condition at about 300 HB.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">g<\/span> This steel may also be supplied in the pre-heat-treated condition at about 300 HB.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">h<\/span> For greater dimensions this steel is normally supplied quenched and tempered at about 380 HB.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">i<\/span> This value applies to smaller dimensions only.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">j<\/span> Hardness in the annealed plus cold drawn condition may be 50 HB higher, and in the annealed plus cold rolled condition 70 HB higher, than in the annealed condition.<\/p>\n<p class=\"ts-p\"><span class=\"ts-sup\">k<\/span> Reference hardening test, oil or salt bath. In case of dispute, oil only. The usual quenching media in practice are air, gas or salt bath.<\/p>\n<\/div>\n\n<h2 class=\"ts-h2\">How to read an ISO 4957 name<\/h2>\n<p class=\"ts-p\">An ISO name carries the alloy in it. A leading X means a tool steel alloyed above about 5 percent total, and the number that follows is the carbon content in hundredths of a percent, so X40CrMoV5-1 is a chromium-molybdenum-vanadium tool steel at about 0.40 percent carbon with about 5 percent chromium and 1 percent molybdenum. A name without the X is a lower alloy grade, where the first number is the carbon in hundredths of a percent. The HS grades use a fixed three-number pattern instead, tungsten, molybdenum and vanadium in that order, so HS6-5-2 is about 6 percent tungsten, 5 percent molybdenum and 2 percent vanadium.<\/p>\n<p class=\"ts-p\">The names do not answer the question a buyer usually has, which is what the grade is called where the tool is made or sold. A few of the ISO grades map onto an AISI grade cleanly, and those are the ones below. Where a whole range of equivalent names is needed, the cross reference is on the <a href=\"https:\/\/aobosteel.com\/tool-steel-equivalent-grades\/\">tool steel equivalent grades page<\/a>.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:30%\">ISO 4957 name<\/th>\n<th style=\"width:22%\">EN 10027-2<\/th>\n<th>Normally quoted as<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-grade\">X153CrMoV12<\/td><td class=\"ts-num\">1.2379<\/td><td class=\"ts-num\">AISI D2<\/td><\/tr>\n<tr><td class=\"ts-grade\">X210Cr12<\/td><td class=\"ts-num\">1.2080<\/td><td class=\"ts-num\">AISI D3<\/td><\/tr>\n<tr><td class=\"ts-grade\">X210CrW12<\/td><td class=\"ts-num\">1.2436<\/td><td class=\"ts-num\">AISI D6<\/td><\/tr>\n<tr><td class=\"ts-grade\">X100CrMoV5<\/td><td class=\"ts-num\">1.2363<\/td><td class=\"ts-num\">AISI A2<\/td><\/tr>\n<tr><td class=\"ts-grade\">90MnCrV8<\/td><td class=\"ts-num\">1.2842<\/td><td class=\"ts-num\">AISI O2<\/td><\/tr>\n<tr><td class=\"ts-grade\">X40CrMoV5-1<\/td><td class=\"ts-num\">1.2344<\/td><td class=\"ts-num\">AISI H13<\/td><\/tr>\n<tr><td class=\"ts-grade\">X37CrMoV5-1<\/td><td class=\"ts-num\">1.2343<\/td><td class=\"ts-num\">AISI H11<\/td><\/tr>\n<tr><td class=\"ts-grade\">55NiCrMoV7<\/td><td class=\"ts-num\">1.2714<\/td><td class=\"ts-num\">AISI L6<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-2<\/td><td class=\"ts-num\">1.3339<\/td><td class=\"ts-num\">AISI M2<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS6-5-2-5<\/td><td class=\"ts-num\">1.3243<\/td><td class=\"ts-num\">AISI M35<\/td><\/tr>\n<tr><td class=\"ts-grade\">HS18-0-1<\/td><td class=\"ts-num\">1.3355<\/td><td class=\"ts-num\">AISI T1<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>The ISO 4957 names whose AISI equivalent is in common use, with the EN 10027-2 number as the standard prints it. Grades outside this short list are better matched on the equivalent grades page than by letter.<\/em><\/p>\n\n<div class=\"ts-dl\"><div class=\"ts-dl-txt\"><strong>ISO 4957 tool steel grades, printable PDF<\/strong> All 48 grades of ISO 4957:1999 in two reference tables, specified composition with the EN 10027-2 and JIS comparables, and the annealed and hardened hardness with the hardening and tempering schedule, in one sheet with our contact details.<\/div> <a class=\"ts-dl-btn\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-ISO-4957-Tool-Steel-Grades.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, 698 KB <\/a><\/div>\n\n<h2 class=\"ts-h2\">Where this sits in a tool steel enquiry<\/h2>\n<p class=\"ts-p\">The ISO name is the order document, and the AISI or the DIN name is what gets quoted back, so the two have to be reconciled before a heat is promised. The grades above that customers ask for most often are covered in more depth on their own pages. Start with <a href=\"https:\/\/aobosteel.com\/tool-steel-equivalent-grades\/\">equivalent grades<\/a>, <a href=\"https:\/\/aobosteel.com\/h13-steel-equivalent-grades\/\">H13 across the standards<\/a>, <a href=\"https:\/\/aobosteel.com\/cold-work-tool-steels\/\">cold work tool steels<\/a>, <a href=\"https:\/\/aobosteel.com\/hot-work-tool-steel-applications\/\">hot work tool steels<\/a> and <a href=\"https:\/\/aobosteel.com\/high-speed-steels\/\">high speed steels<\/a>. The composition the standard allows for each AISI grade is on the <a href=\"https:\/\/aobosteel.com\/tool-steel-composition-chart\/\">tool steel composition chart<\/a>, and the processing and service ratings are on the <a href=\"https:\/\/aobosteel.com\/tool-steel-properties-chart\/\">AISI tool steel properties chart<\/a> and the <a href=\"https:\/\/aobosteel.com\/tool-steel-processing-characteristics\/\">processing and service characteristics chart<\/a>.<\/p>\n\n<div class=\"ts-disclaimer\">\n<h3>Before you use these values<\/h3>\n<p>This page reproduces the composition and hardness tables of ISO 4957:1999 as published, and it is not an Aobo Steel specification. A purchase is made against the standard and the test certificate that comes with the heat, not against a table on a page. Where a drawing calls up an ISO name and the mill produces to AISI or GB, the two have to be reconciled before the steel is ordered.<\/p>\n<\/div>\n\n<p class=\"ts-source\">Source, ISO 4957:1999 (BS EN ISO 4957:2000), Tool Steels, Tables 1 and 2, as reproduced in Handbook of Mechanical Alloy Design (G. E. Totten, L. Xie and K. Funatani, eds.), Marcel Dekker, 2004, Chapter 4 (Yang and Collins), pages 189 to 192.<\/p>\n\n<\/div><\/div><\/section>\n\n","protected":false},"excerpt":{"rendered":"<p>Tool Steel | International Standard | ISO 4957 ISO 4957 Tool Steel Grades: Composition, Hardness and Equivalents ISO 4957 is the international standard for tool steels. It names every grade itself instead of using the American AISI letter system, so a buyer who writes it on an enquiry writes names like X40CrMoV5-1 and HS6-5-2, and [&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 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