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| AISI 4340 | |
 | |
| Conditions | Hardness | ||
| T (°C) | Treatment | Method | Value |
| 25 | annealed at 810°C | HB | 217 |
| 25 | normalized at 870°C | HB | 363 |
| 25 | oil quenched, fine grained, tempered at 205°C | HB | 520 |
| 25 | oil quenched, fine grained, tempered at 315°C | HB | 486 |
| 25 | oil quenched, fine grained, tempered at 425°C | HB | 430 |
| 25 | oil quenched, fine grained, tempered at 540°C | HB | 360 |
| 25 | oil quenched, fine grained, tempered at 650°C | HB | 280 |
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