30CrNiMo8
1.6580High-strength quenched and tempered Cr-Ni-Mo steel for very large cross-sections. Even better hardenability than 34CrNiMo6 due to higher Cr and Ni content. Used for large shafts (>200mm diameter), heavy-duty gears, turbine rotors, and critical aerospace components.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 4340 | G43400 | REF |
| 🇪🇺 | EN | Europe | 30CrNiMo8 | 1.6580 | 100% |
| 🇫🇷 | AFNOR | France | 30CND8 | — | 97% |
| 🇬🇧 | BS | United Kingdom | 823M30 | — | 93% |
Sources: ASTM A29, EN 10083-3:2006, NF EN 10083-3, BS 970
Mechanical properties — Pro
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Hardness HRC | ||
| Elastic Modulus | ||
| Density |
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51CrMoV4
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20MnCr5
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