{"id":18245,"date":"2026-09-13T20:09:54","date_gmt":"2026-09-13T12:09:54","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=18245"},"modified":"2026-09-15T07:51:24","modified_gmt":"2026-09-14T23:51:24","slug":"tool-steel-hardening-tempering-chart","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/tool-steel-hardening-tempering-chart\/","title":{"rendered":"Tool Steel Hardening and Tempering Temperature Chart"},"content":{"rendered":"\n\n\n\n\n\nTool Steel Hardening and Tempering Chart (AISI M, T, H, D, A, O, S, P, L, F, W) | Aobo Steel<\/title>\n<meta name=\"description\" content=\"Recommended hardening and tempering practice for the principal AISI tool steels - preheat and austenitizing temperatures, soak time, quenching medium and tempering temperatures for the M, T, H, D, A, O, S, P, L, F and W groups.\">\n<style>\n:root{\n --aobo-accent:#2563eb; --aobo-accent-dark:#1e1e2e; --aobo-blue:#0c56d0; --aobo-blue-dark:#073b91;\n --aobo-text:#333; --aobo-muted:#888; 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.ts-rel{margin-top:1.2em;background:#fff;border:1px solid var(--aobo-border);\n border-left:3px solid var(--aobo-blue);border-radius:0 var(--aobo-radius) var(--aobo-radius) 0;padding:1em 1.2em;}\n .ts-rel h3{margin:0 0 .5em;font-size:.95em;color:var(--aobo-text);}\n .ts-rel p{margin:0;font-size:.85em;line-height:1.9;color:var(--aobo-muted);}\n .ts-rel p a{font-weight:600;}\n<\/style>\n<\/head>\n<body>\n<section class=\"aobo-ht-ref ts-props\">\n <div class=\"aobo-wrap\">\n <div class=\"ts-hero\">\n <div class=\"ts-hero-top\">\n <div class=\"ts-kicker\"><span><\/span>Tool Steel Reference Data<\/div>\n <h1>Tool Steel Hardening and Tempering Chart<\/h1>\n <p>Recommended hardening and tempering practice for the principal AISI tool steels — preheat and austenitizing (hardening) temperatures, soak time, quenching medium and tempering temperature, grouped by steel family. Values are given in both °C and °F as printed in the source.<\/p>\n <\/div>\n <div class=\"ts-tool-area\">\n <div class=\"ts-legend\">\n <span><b>°C \/ °F<\/b> both given<\/span>\n <span><b>730-845<\/b> from–to range<\/span>\n <span><b>—<\/b> not specified<\/span>\n <span><b>(a)–(k)<\/b> footnote<\/span>\n <span><b>O · A · S · W · B<\/b> quench media<\/span>\n <\/div>\n <div class=\"ts-table-wrap\">\n <table class=\"ts-table\">\n <thead>\n <tr>\n <th rowspan=\"3\">Type<\/th>\n <th rowspan=\"3\">Rate of heating<\/th>\n <th colspan=\"5\">Hardening<\/th>\n <th rowspan=\"3\">Quenching<br>medium<sup>(a)<\/sup><\/th>\n <th colspan=\"2\">Tempering temperature<\/th>\n <\/tr>\n <tr>\n <th colspan=\"2\" class=\"ts-sub\">Preheat temperature<\/th>\n <th colspan=\"2\" class=\"ts-sub\">Hardening temperature<\/th>\n <th rowspan=\"2\" class=\"ts-sub\">Time at temperature, min<\/th>\n <th rowspan=\"2\" class=\"ts-sub\">°C<\/th>\n <th rowspan=\"2\" class=\"ts-sub\">°F<\/th>\n <\/tr>\n <tr>\n <th class=\"ts-sub\">°C<\/th>\n <th class=\"ts-sub\">°F<\/th>\n <th class=\"ts-sub\">°C<\/th>\n <th class=\"ts-sub\">°F<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n<tr class=\"ts-group\"><td colspan=\"10\">Molybdenum high-speed steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">M1, M7, M10<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1175-1220<\/td><td class=\"ts-num\">2150-2225 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-595 <span class=\"ts-sup\">(c)<\/span><\/td><td class=\"ts-num\">1000-1100 <span class=\"ts-sup\">(c)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M2<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1190-1230<\/td><td class=\"ts-num\">2175-2250 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-595 <span class=\"ts-sup\">(c)<\/span><\/td><td class=\"ts-num\">1000-1100 <span class=\"ts-sup\">(c)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M3, M4, M30, M33, M34, M35<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1205-1230 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2200-2250 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-595 <span class=\"ts-sup\">(c)<\/span><\/td><td class=\"ts-num\">1000-1100 <span class=\"ts-sup\">(c)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M36<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1220-1245 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2225-2275 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-595 <span class=\"ts-sup\">(c)<\/span><\/td><td class=\"ts-num\">1000-1100 <span class=\"ts-sup\">(c)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M41<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1190-1215 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2175-2220 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-595 <span class=\"ts-sup\">(d)<\/span><\/td><td class=\"ts-num\">1000-1100 <span class=\"ts-sup\">(d)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M42<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1190-1210 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2175-2210 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">510-595 <span class=\"ts-sup\">(d)<\/span><\/td><td class=\"ts-num\">950-1100 <span class=\"ts-sup\">(d)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M43<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1190-1215 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2175-2220 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">510-595 <span class=\"ts-sup\">(d)<\/span><\/td><td class=\"ts-num\">950-1100 <span class=\"ts-sup\">(d)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M44<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1200-1225 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2190-2240 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-625 <span class=\"ts-sup\">(d)<\/span><\/td><td class=\"ts-num\">1000-1160 <span class=\"ts-sup\">(d)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M46<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1190-1220 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2175-2225 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">525-565 <span class=\"ts-sup\">(d)<\/span><\/td><td class=\"ts-num\">975-1050 <span class=\"ts-sup\">(d)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M47<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1175-1200 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2150-2200 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">525-595 <span class=\"ts-sup\">(d)<\/span><\/td><td class=\"ts-num\">975-1100 <span class=\"ts-sup\">(d)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M48<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1175-1200 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2150-2200 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-595 <span class=\"ts-sup\">(d)<\/span><\/td><td class=\"ts-num\">1000-1100 <span class=\"ts-sup\">(d)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">M62<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1175-1200 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2150-2200 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-595 <span class=\"ts-sup\">(d)<\/span><\/td><td class=\"ts-num\">1000-1100 <span class=\"ts-sup\">(d)<\/span><\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Tungsten high-speed steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">T1, T2, T4, T8<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">815-870<\/td><td class=\"ts-num\">1500-1600<\/td><td class=\"ts-num\">1260-1300 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2300-2375 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-595 <span class=\"ts-sup\">(c)<\/span><\/td><td class=\"ts-num\">1000-1100 <span class=\"ts-sup\">(c)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">T5, T6<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">815-870<\/td><td class=\"ts-num\">1500-1600<\/td><td class=\"ts-num\">1275-1300 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2325-2375 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-595 <span class=\"ts-sup\">(c)<\/span><\/td><td class=\"ts-num\">1000-1100 <span class=\"ts-sup\">(c)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">T15<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">815-870<\/td><td class=\"ts-num\">1500-1600<\/td><td class=\"ts-num\">1205-1260 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2200-2300 <span class=\"ts-sup\">(b)<\/span><\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">540-650 <span class=\"ts-sup\">(d)<\/span><\/td><td class=\"ts-num\">1000-1200 <span class=\"ts-sup\">(d)<\/span><\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Intermediate high-speed steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">M50<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1095-1120<\/td><td class=\"ts-num\">2000-2050<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">525-595<\/td><td class=\"ts-num\">975-1100<\/td><\/tr>\n<tr><td class=\"ts-grade\">M52<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1120-1175<\/td><td class=\"ts-num\">2050-2150<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A, or S<\/td><td class=\"ts-num\">525-595<\/td><td class=\"ts-num\">975-1100<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Chromium hot-work steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">H10<\/td><td class=\"ts-rate\">Moderately from preheat<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">1010-1040<\/td><td class=\"ts-num\">1850-1900<\/td><td class=\"ts-num\">15-40 <span class=\"ts-sup\">(e)<\/span><\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">540-650<\/td><td class=\"ts-num\">1000-1200<\/td><\/tr>\n<tr><td class=\"ts-grade\">H11, H12<\/td><td class=\"ts-rate\">Moderately from preheat<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">995-1025<\/td><td class=\"ts-num\">1825-1875<\/td><td class=\"ts-num\">15-40 <span class=\"ts-sup\">(e)<\/span><\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">540-650<\/td><td class=\"ts-num\">1000-1200<\/td><\/tr>\n<tr><td class=\"ts-grade\">H13<\/td><td class=\"ts-rate\">Moderately from preheat<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">995-1040<\/td><td class=\"ts-num\">1825-1900<\/td><td class=\"ts-num\">15-40 <span class=\"ts-sup\">(e)<\/span><\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">540-650<\/td><td class=\"ts-num\">1000-1200<\/td><\/tr>\n<tr><td class=\"ts-grade\">H14<\/td><td class=\"ts-rate\">Moderately from preheat<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">1010-1065<\/td><td class=\"ts-num\">1850-1950<\/td><td class=\"ts-num\">15-40 <span class=\"ts-sup\">(e)<\/span><\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">540-650<\/td><td class=\"ts-num\">1000-1200<\/td><\/tr>\n<tr><td class=\"ts-grade\">H19<\/td><td class=\"ts-rate\">Moderately from preheat<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">1095-1205<\/td><td class=\"ts-num\">2000-2200<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">A or O<\/td><td class=\"ts-num\">540-705<\/td><td class=\"ts-num\">1000-1300<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Tungsten hot-work steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">H21, H22<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">1095-1205<\/td><td class=\"ts-num\">2000-2200<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">A or O<\/td><td class=\"ts-num\">595-675<\/td><td class=\"ts-num\">1100-1250<\/td><\/tr>\n<tr><td class=\"ts-grade\">H23<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">845<\/td><td class=\"ts-num\">1550<\/td><td class=\"ts-num\">1205-1260<\/td><td class=\"ts-num\">2200-2300<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">650-815<\/td><td class=\"ts-num\">1200-1500<\/td><\/tr>\n<tr><td class=\"ts-grade\">H24<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">1095-1230<\/td><td class=\"ts-num\">2000-2250<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">565-650<\/td><td class=\"ts-num\">1050-1200<\/td><\/tr>\n<tr><td class=\"ts-grade\">H25<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">1150-1260<\/td><td class=\"ts-num\">2100-2300<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">A or O<\/td><td class=\"ts-num\">565-675<\/td><td class=\"ts-num\">1050-1250<\/td><\/tr>\n<tr><td class=\"ts-grade\">H26<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">870<\/td><td class=\"ts-num\">1600<\/td><td class=\"ts-num\">1175-1260<\/td><td class=\"ts-num\">2150-2300<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A or S<\/td><td class=\"ts-num\">565-675<\/td><td class=\"ts-num\">1050-1250<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Molybdenum hot-work steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">H41, H43<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1095-1190<\/td><td class=\"ts-num\">2000-2175<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A or S<\/td><td class=\"ts-num\">565-650<\/td><td class=\"ts-num\">1050-1200<\/td><\/tr>\n<tr><td class=\"ts-grade\">H42<\/td><td class=\"ts-rate\">Rapidly from preheat<\/td><td class=\"ts-num\">730-845<\/td><td class=\"ts-num\">1350-1550<\/td><td class=\"ts-num\">1120-1220<\/td><td class=\"ts-num\">2050-2225<\/td><td class=\"ts-num\">2-5<\/td><td class=\"ts-quench\">O, A or S<\/td><td class=\"ts-num\">565-650<\/td><td class=\"ts-num\">1050-1200<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">High-carbon, high-chromium, cold-work steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">D1, D5<\/td><td class=\"ts-rate\">Very slowly<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">980-1025<\/td><td class=\"ts-num\">1800-1875<\/td><td class=\"ts-num\">15-45<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">205-540<\/td><td class=\"ts-num\">400-1000<\/td><\/tr>\n<tr><td class=\"ts-grade\">D3<\/td><td class=\"ts-rate\">Very slowly<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">925-980<\/td><td class=\"ts-num\">1700-1800<\/td><td class=\"ts-num\">15-45<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">205-540<\/td><td class=\"ts-num\">400-1000<\/td><\/tr>\n<tr><td class=\"ts-grade\">D4<\/td><td class=\"ts-rate\">Very slowly<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">970-1010<\/td><td class=\"ts-num\">1775-1850<\/td><td class=\"ts-num\">15-45<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">205-540<\/td><td class=\"ts-num\">400-1000<\/td><\/tr>\n<tr><td class=\"ts-grade\">D7<\/td><td class=\"ts-rate\">Very slowly<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">1010-1065<\/td><td class=\"ts-num\">1850-1950<\/td><td class=\"ts-num\">30-60<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">150-540<\/td><td class=\"ts-num\">300-1000<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Medium-alloy, air-hardening, cold-work steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">A2<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">790<\/td><td class=\"ts-num\">1450<\/td><td class=\"ts-num\">925-980<\/td><td class=\"ts-num\">1700-1800<\/td><td class=\"ts-num\">20-45<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">175-540<\/td><td class=\"ts-num\">350-1000<\/td><\/tr>\n<tr><td class=\"ts-grade\">A3<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">790<\/td><td class=\"ts-num\">1450<\/td><td class=\"ts-num\">955-980<\/td><td class=\"ts-num\">1750-1800<\/td><td class=\"ts-num\">25-60<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">175-540<\/td><td class=\"ts-num\">350-1000<\/td><\/tr>\n<tr><td class=\"ts-grade\">A4<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">675<\/td><td class=\"ts-num\">1250<\/td><td class=\"ts-num\">815-870<\/td><td class=\"ts-num\">1500-1600<\/td><td class=\"ts-num\">20-45<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">175-425<\/td><td class=\"ts-num\">350-800<\/td><\/tr>\n<tr><td class=\"ts-grade\">A6<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">650<\/td><td class=\"ts-num\">1200<\/td><td class=\"ts-num\">830-870<\/td><td class=\"ts-num\">1525-1600<\/td><td class=\"ts-num\">20-45<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">150-425<\/td><td class=\"ts-num\">300-800<\/td><\/tr>\n<tr><td class=\"ts-grade\">A7<\/td><td class=\"ts-rate\">Very slowly<\/td><td class=\"ts-num\">815<\/td><td class=\"ts-num\">1500<\/td><td class=\"ts-num\">955-980<\/td><td class=\"ts-num\">1750-1800<\/td><td class=\"ts-num\">30-60<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">150-540<\/td><td class=\"ts-num\">300-1000<\/td><\/tr>\n<tr><td class=\"ts-grade\">A8<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">790<\/td><td class=\"ts-num\">1450<\/td><td class=\"ts-num\">980-1010<\/td><td class=\"ts-num\">1800-1850<\/td><td class=\"ts-num\">20-45<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">175-595<\/td><td class=\"ts-num\">350-1100<\/td><\/tr>\n<tr><td class=\"ts-grade\">A9<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">790<\/td><td class=\"ts-num\">1450<\/td><td class=\"ts-num\">980-1025<\/td><td class=\"ts-num\">1800-1875<\/td><td class=\"ts-num\">20-45<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">510-620<\/td><td class=\"ts-num\">950-1150<\/td><\/tr>\n<tr><td class=\"ts-grade\">A10<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">650<\/td><td class=\"ts-num\">1200<\/td><td class=\"ts-num\">790-815<\/td><td class=\"ts-num\">1450-1500<\/td><td class=\"ts-num\">30-60<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">175-425<\/td><td class=\"ts-num\">350-800<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Oil-hardening cold-work steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">O1<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">650<\/td><td class=\"ts-num\">1200<\/td><td class=\"ts-num\">790-815<\/td><td class=\"ts-num\">1450-1500<\/td><td class=\"ts-num\">10-30<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">175-260<\/td><td class=\"ts-num\">350-500<\/td><\/tr>\n<tr><td class=\"ts-grade\">O2<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">650<\/td><td class=\"ts-num\">1200<\/td><td class=\"ts-num\">760-800<\/td><td class=\"ts-num\">1400-1475<\/td><td class=\"ts-num\">5-20<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">175-260<\/td><td class=\"ts-num\">350-500<\/td><\/tr>\n<tr><td class=\"ts-grade\">O6<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">790-815<\/td><td class=\"ts-num\">1450-1500<\/td><td class=\"ts-num\">10-30<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">175-315<\/td><td class=\"ts-num\">350-600<\/td><\/tr>\n<tr><td class=\"ts-grade\">O7<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">650<\/td><td class=\"ts-num\">1200<\/td><td class=\"ts-num\">790-830<br>845-885<\/td><td class=\"ts-num\">W: 1450-1525<br>O: 1550-1625<\/td><td class=\"ts-num\">10-30<\/td><td class=\"ts-quench\">O or W<\/td><td class=\"ts-num\">175-290<\/td><td class=\"ts-num\">350-550<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Shock-resisting steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">S1<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">900-955<\/td><td class=\"ts-num\">1650-1750<\/td><td class=\"ts-num\">15-45<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">205-650<\/td><td class=\"ts-num\">400-1200<\/td><\/tr>\n<tr><td class=\"ts-grade\">S2<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">650 <span class=\"ts-sup\">(f)<\/span><\/td><td class=\"ts-num\">1200 <span class=\"ts-sup\">(f)<\/span><\/td><td class=\"ts-num\">845-900<\/td><td class=\"ts-num\">1550-1650<\/td><td class=\"ts-num\">5-20<\/td><td class=\"ts-quench\">B or W<\/td><td class=\"ts-num\">175-425<\/td><td class=\"ts-num\">350-800<\/td><\/tr>\n<tr><td class=\"ts-grade\">S5<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">760<\/td><td class=\"ts-num\">1400<\/td><td class=\"ts-num\">870-925<\/td><td class=\"ts-num\">1600-1700<\/td><td class=\"ts-num\">5-20<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">175-425<\/td><td class=\"ts-num\">350-800<\/td><\/tr>\n<tr><td class=\"ts-grade\">S7<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">650-705<\/td><td class=\"ts-num\">1200-1300<\/td><td class=\"ts-num\">925-955<\/td><td class=\"ts-num\">1700-1750<\/td><td class=\"ts-num\">15-45<\/td><td class=\"ts-quench\">A or O<\/td><td class=\"ts-num\">205-620<\/td><td class=\"ts-num\">400-1150<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Mold steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">P2<\/td><td class=\"ts-rate\">—<\/td><td class=\"ts-num\">900-925 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">1650-1750 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">830-845 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">1525-1550 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">15<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">175-260<\/td><td class=\"ts-num\">350-500<\/td><\/tr>\n<tr><td class=\"ts-grade\">P3<\/td><td class=\"ts-rate\">—<\/td><td class=\"ts-num\">900-925 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">1650-1700 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">800-830 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">1475-1525 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">15<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">175-260<\/td><td class=\"ts-num\">350-500<\/td><\/tr>\n<tr><td class=\"ts-grade\">P4<\/td><td class=\"ts-rate\">—<\/td><td class=\"ts-num\">970-995 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">1775-1825 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">970-995 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">1775-1825 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">15<\/td><td class=\"ts-quench\">A<\/td><td class=\"ts-num\">175-480<\/td><td class=\"ts-num\">350-900<\/td><\/tr>\n<tr><td class=\"ts-grade\">P5<\/td><td class=\"ts-rate\">—<\/td><td class=\"ts-num\">900-925 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">1650-1700 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">845-870 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">1550-1600 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">15<\/td><td class=\"ts-quench\">O or W<\/td><td class=\"ts-num\">175-260<\/td><td class=\"ts-num\">350-500<\/td><\/tr>\n<tr><td class=\"ts-grade\">P6<\/td><td class=\"ts-rate\">—<\/td><td class=\"ts-num\">900-925 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">1650-1700 <span class=\"ts-sup\">(g)<\/span><\/td><td class=\"ts-num\">790-815 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">1450-1500 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">15<\/td><td class=\"ts-quench\">A or O<\/td><td class=\"ts-num\">175-230<\/td><td class=\"ts-num\">350-450<\/td><\/tr>\n<tr><td class=\"ts-grade\">P20<\/td><td class=\"ts-rate\">—<\/td><td class=\"ts-num\">870-900 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">1600-1650 <span class=\"ts-sup\">(h)<\/span><\/td><td class=\"ts-num\">815-870<\/td><td class=\"ts-num\">1500-1600<\/td><td class=\"ts-num\">15<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">480-595 <span class=\"ts-sup\">(i)<\/span><\/td><td class=\"ts-num\">900-1100 <span class=\"ts-sup\">(i)<\/span><\/td><\/tr>\n<tr><td class=\"ts-grade\">P21 <span class=\"ts-sup\">(j)<\/span><\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-desc\" colspan=\"2\">Do not preheat<\/td><td class=\"ts-num\">705-730<\/td><td class=\"ts-num\">1300-1350<\/td><td class=\"ts-num\">60-180<\/td><td class=\"ts-quench\">A or O<\/td><td class=\"ts-num\">510-550<\/td><td class=\"ts-num\">950-1025<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Low-alloy special-purpose steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">L2<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">W: 790-845<br>O: 845-925<\/td><td class=\"ts-num\">W: 1450-1550<br>O: 1550-1700<\/td><td class=\"ts-num\">10-30<\/td><td class=\"ts-quench\">O or W<\/td><td class=\"ts-num\">175-540<\/td><td class=\"ts-num\">350-1000<\/td><\/tr>\n<tr><td class=\"ts-grade\">L3<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">W: 775-815<br>O: 815-870<\/td><td class=\"ts-num\">W: 1425-1500<br>1500-1600<\/td><td class=\"ts-num\">10-30<\/td><td class=\"ts-quench\">O or W<\/td><td class=\"ts-num\">175-315<\/td><td class=\"ts-num\">350-600<\/td><\/tr>\n<tr><td class=\"ts-grade\">L6<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">—<\/td><td class=\"ts-num\">790-845<\/td><td class=\"ts-num\">1450-1550<\/td><td class=\"ts-num\">10-30<\/td><td class=\"ts-quench\">O<\/td><td class=\"ts-num\">175-540<\/td><td class=\"ts-num\">350-1000<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Carbon-tungsten special-purpose steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">F1, F2<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">650<\/td><td class=\"ts-num\">1200<\/td><td class=\"ts-num\">790-870<\/td><td class=\"ts-num\">1450-1600<\/td><td class=\"ts-num\">15<\/td><td class=\"ts-quench\">W or B<\/td><td class=\"ts-num\">175-260<\/td><td class=\"ts-num\">350-500<\/td><\/tr>\n<tr class=\"ts-group\"><td colspan=\"10\">Water-hardening steels<\/td><\/tr>\n<tr><td class=\"ts-grade\">W1, W2, W3<\/td><td class=\"ts-rate\">Slowly<\/td><td class=\"ts-num\">565-650 <span class=\"ts-sup\">(k)<\/span><\/td><td class=\"ts-num\">1050-1200 <span class=\"ts-sup\">(k)<\/span><\/td><td class=\"ts-num\">760-845<\/td><td class=\"ts-num\">1400-1550<\/td><td class=\"ts-num\">10-30<\/td><td class=\"ts-quench\">B or W<\/td><td class=\"ts-num\">175-345<\/td><td class=\"ts-num\">350-650<\/td><\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <ul class=\"ts-notes-list\">\n<li><sup>(a)<\/sup> O, oil quench; A, air cool; S, salt bath quench; W, water quench; B, brine quench.<\/li>\n<li><sup>(b)<\/sup> When the high-temperature heating is carried out in a salt bath, the range of temperatures should be about 14 °C (25 °F) lower than given here.<\/li>\n<li><sup>(c)<\/sup> Double tempering recommended for not less than 1 h at temperature each time.<\/li>\n<li><sup>(d)<\/sup> Triple tempering recommended for not less than 1 h at temperature each time.<\/li>\n<li><sup>(e)<\/sup> Times apply to open furnace heat treatment. For pack hardening, a common rule is to heat 1.2 min per mm (30 min per in.) of cross section of the pack.<\/li>\n<li><sup>(f)<\/sup> Preferable for large tools to minimize decarburization.<\/li>\n<li><sup>(g)<\/sup> Carburizing temperature.<\/li>\n<li><sup>(h)<\/sup> After carburizing.<\/li>\n<li><sup>(i)<\/sup> Carburized per case hardness.<\/li>\n<li><sup>(j)<\/sup> P21 is a precipitation-hardening steel having a thermal treatment that involves solution treating and aging rather than hardening and tempering.<\/li>\n<li><sup>(k)<\/sup> Recommended for large tools and tools with intricate sections.<\/li>\n <\/ul>\n <div class=\"ts-disclaimer\">\n <h3>Table notes<\/h3>\n <p>For O7, L2 and L3 the source gives two hardening ranges: the <b>W:<\/b> value applies to water quenching and the <b>O:<\/b> value to oil quenching. O7’s hardening ranges are printed in the W\/O order in the °F column.<\/p>\n <p>Two printed values are corrected here, following cross-checks against the source’s own companion values: A6’s hardening temperature is printed “1525n-;1600” in the e-book and is given as 1525–1600 °F (matching the 830–870 °C range); S7’s tempering range is printed 205–260 °C, which does not match its own 400–1150 °F column, and is given as 205–620 °C (620 °C = 1150 °F), matching the parallel tables in <i>Tool Steels<\/i> (Roberts & Krauss, 5th ed.) and <i>Machinery’s Handbook<\/i>.<\/p>\n <p>The source table does not include D2 among the high-carbon, high-chromium cold-work steels; see the <a href=\"\/d2-tool-steel-heat-treatment-guide\/\">D2 tool steel heat treatment guide<\/a> for that grade.<\/p>\n <p>Hardening temperatures are austenitizing temperatures for conventional heat treatment; the quenching medium letter codes are explained in footnote (a). These are reference ranges — confirm production practice with your heat treater, since furnace type, load and section size all shift the working schedule. When a cycle does go wrong, the causes and the corrections are listed in the <a href=\"https:\/\/aobosteel.com\/tool-steel-heat-treatment-troubleshooting-chart\/\">heat treatment troubleshooting chart<\/a>.<\/p>\n <\/div>\n <div class=\"ts-rel\">\n <h3>Related reference pages<\/h3>\n <p><a href=\"\/tool-steel-composition-chart\/\">Tool steel composition chart<\/a> · <a href=\"\/tool-steel-annealing-normalizing-temperature-chart\/\">Tool steel annealing & normalizing temperature chart<\/a> · <a href=\"\/tool-steel-processing-characteristics\/\">Tool steel processing & service characteristics<\/a> · <a href=\"\/tool-steel-properties-chart\/\">Tool steel properties chart<\/a> · <a href=\"\/tool-steel-equivalent-grades\/\">Tool steel equivalent grades<\/a> · <a href=\"\/tool-steel-heat-treatment-guide\/\">Tool steel heat treatment guide<\/a> · <a href=\"\/d2-tool-steel-heat-treatment-guide\/\">D2 tool steel heat treatment guide<\/a> · <a href=\"\/h13-tool-steel\/\">H13 tool steel<\/a> · <a href=\"\/d2-tool-steel\/\">D2 tool steel<\/a> · <a href=\"\/o1-tool-steel\/\">O1 tool steel<\/a> · <a href=\"\/how-to-select-tool-steels\/\">How to select tool steels<\/a><\/p>\n <\/div>\n <p class=\"ts-source\">Source: ASM Handbook, Volume 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys, Table 9 “Hardening and tempering of tool steels” (10th ed.). Reference data for comparison — verify the applicable standard before ordering.<\/p>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>Tool Steel Hardening and Tempering Chart (AISI M, T, H, D, A, O, S, P, L, F, W) | Aobo Steel Tool Steel Reference Data Tool Steel Hardening and Tempering Chart Recommended hardening and tempering practice for the principal AISI tool steels — preheat and austenitizing (hardening) temperatures, soak time, quenching medium and tempering temperature, […]<\/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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