🇺🇸 USA equivalent of
39NiCrMo31.6510
AISI 9840REF
Standard: AISI · Source: ASTM A519
US equivalent — similar to 4340 with lower Ni
Other international equivalents
| Country | Standard | Grade | Match | |
|---|---|---|---|---|
| 🇪🇺 | Europe | EN | 39NiCrMo3 / 1.6510 | 100% |
| 🇫🇷 | France | AFNOR | 40NCD3 | 95% |