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CARBON & ALLOY STEELS HEAT TREATMENTS
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| AISI | GRADE NAME |
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QUENCH MEDIUM | TEMPERING TEMP. °F | TYPICAL APPLICATION HARDNESS HRC | |
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| 4140 MOD. | MAXEL TOOLING ALLOY | 1550 | 185/200 | 1250/1300 | 1550/1600 | OIL | 400/1200 | 25-45 | |
| 4140 MOD.+Al | NITRIDING 135 MOD | N/A SUPPLIED PRE-HARDENED | 28-30* | ||||||
| 4150-S | MAXEL 3-1/2 / BRAKE DIE | 1550 | 170/212 | 1300/1350 | 1525/1575 | OIL | 900/1300 | 25-35 | |
| 4150 MOD | HOLDER BLOCK | N/A SUPPLIED PRE-HARDENED | 28-30 | ||||||
| 4340 | 4340 | 1550 | 217/248 | 1200/1250 | 1475/1500 | OIL | 400/1200 | 30-50 | |
| 6150 | 6150 | 1500 | 170/201 | 1200/1250 | 1550/1650 | OIL | 400/1200 | 40-55 | |
| 8620 | 8620 | 1600 | 143/163 | STANDARD CARBURIZING TREATMENTS | CARBURIZED | ||||
| 52100 | 52100 | 1440 | 183/212 | 1200/1250 | 1500/1550 | OIL/WATER | 300/500 | 50-60 | |
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| *Nitrided surface will be higher hardness. The heat treating information shown represents typical procedures and hardnesses for many applications. Other procedures and hardnesses may be available. See individual data sections for more specific information. |
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