M42 HIGH-SPEED STEEL
| SOME GUIDELINES FOR HARDENING |
| TOOL | M42 | |
| Hardening | Tempering twice | |
| Single- edge cutting tools, tool bits, form tools, etc. | 1190°C 2175°F |
550°C 1020°F |
| Rotating multi-edge cutting tools, hobs miling cutters, broaches, taps, etc. | 1150°C – 1180°C 2100°F – 2155°F |
560°C – 580°C 1040°F –1075°F |
| Tools for cold work applications, punching, blanking, forming, cold extrusion, etc. | 1050°C – 1150°C 1920°F – 2100°F |
560°C – 590°C 1040°F – 1095°F |