40NiCrMo7
1.6563High-nickel Cr-Mo quench & temper steel for large cross-sections. 1.6-2.0% Ni gives superior hardenability compared to 39NiCrMo3 — through-hardening up to ~130mm diameter. Close to AISI 4340 composition. Used for heavy crankshafts, large gears, turbine shafts, connecting rods, and critical structural fasteners in energy and heavy machinery sectors.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 4340 (close) | — | REF |
| 🇪🇺 | EN | Europe | 40NiCrMo7 / 1.6563 | 1.6563 | 100% |
Sources: ASTM A29, EN 10083-3
Mechanical properties — Pro
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Hardness HB | ||
| Elastic Modulus | ||
| Density |
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