EN 34CrNiMo6: High-Strength European Quenched & Tempered Steel
EN 10083-3 · Updated: 2026-05-25
EN 34CrNiMo6 (1.6582) is the European equivalent to AISI 4340, specified under EN 10083-3 for quenched and tempered steels. With 0.30-0.38% C, 1.30-1.70% Ni, 1.30-1.70% Cr, and 0.15-0.30% Mo, it achieves deep hardenability (up to 120 mm diameter in oil). Widely used for heavy-duty shafts, wind turbine main shafts, large gears, and hydraulic cylinder rods in European machinery. The slightly narrower chemistry range than AISI 4340 ensures more consistent heat treatment response across batches. Available in bright bar, forged bar, and plate formats.
Quick Facts
| Category | Alloy Steel |
| Standard | EN 10083-3 |
| Density | 7.85 g/cm³ |
| Yield Strength | 900 MPa (130 ksi) Q&T |
| Tensile Strength | 1,100 MPa (160 ksi) Q&T |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| AISI 4340 | Compare |
| DIN 1.6582 | Compare |
| SNCM447 | Compare |
| 40CrNiMoA | Compare |
| BS 817M40 | Compare |
Related Materials
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Frequently Asked Questions
How does 34CrNiMo6 compare to 42CrMo4 (4140)?
34CrNiMo6 adds 1.3-1.7% nickel to the 42CrMo4 base chemistry, approximately tripling the through-hardening diameter and dramatically improving low-temperature toughness. For sections over 60 mm, 34CrNiMo6 is essential for uniform properties. For sections under 40 mm where full hardening is achievable with both grades, 42CrMo4 is more economical. Choose based on section size rather than generic preference.