Hot Work Tool Steel
H-grade tool steels are crafted for strength and hardness under extreme heat. With carbide-forming alloys enhancing durability, H1-H19 grades use 5% chromium for oxidation resistance and toughness, while H20-H39 rely on tungsten for superior heat resistance. They excel in tools for high-temperature applications.
Heat Treatment
| AISI/ASTM | Annealing (°C) | Quenching (°C) | Tempering (°C) | Annealed (HB – max) | Quenched & Tempered (HRC) |
|---|---|---|---|---|---|
| H11 | 750-800 | 1000-1040 | 500-600 | 240 | 48 |
| H13 | 800-850 | 1000-1085 | 500-600 | 230 | 52 |
| H12 | 800-870 | 1000-1050 | 500-600 | 230 | 52 |
| H21 | 750-800 | 1070-1150 | 500-600 | 240 | 51 |
| L6 | 750-800 | 830-850 | 400-650 | 240 | 50 |