39NiCrMo3 vs 34CrNiMo6: Both NiCrMo QT steels — 34CrNiMo6 has more Ni+Cr for larger sections
39NiCrMo3 vs 34CrNiMo6
Side-by-side chemical composition and mechanical property comparison.
Overview
39NiCrMo3
1.6510
Nickel-chromium-molybdenum quench & temper steel. Similar to AISI 4340 but with lower Ni — more economical. Good hardenability for sections up to ~80mm. Excellent balance of strength, toughness, and fatigue resistance. High white-point sensitivity — hydrogen control required. Used for crankshafts, connecting rods, gear shafts, landing gear components, and heavy-duty machinery parts.
34CrNiMo6
1.6582
High-strength quenched and tempered Cr-Ni-Mo steel. Excellent hardenability and toughness, suitable for large cross-sections. Used for heavy-duty shafts, gears, turbine parts, and aerospace components.
| 39NiCrMo3 | 34CrNiMo6 | |
|---|---|---|
| Material Number | 1.6510 | 1.6582 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10083-3 | EN 10083-3 |
Chemical composition (wt%)
| Element | 39NiCrMo3 | 34CrNiMo6 | Overlap |
|---|---|---|---|
| C | 0.35–0.43% | 0.3–0.38% | Partial |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.5–0.8% | 0.5–0.8% | OK |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | 39NiCrMo3 | 34CrNiMo6 | Unit |
|---|---|---|---|
| tensile_strength | 900–1200 | 1000–1200 | MPa |
| yield_strength | 600–800 | ≥ 800 | MPa |
| elongation | 10–16 | ≥ 11 | % |
Compatibility Assessment
34CrNiMo6 has ~1.5% Ni and ~1.5% Cr vs 39NiCrMo3 with ~0.85% each — deeper hardenability for sections up to ~100mm. 39NiCrMo3 is more economical with adequate hardenability to ~80mm. Both offer excellent toughness. Choose 34CrNiMo6 for larger sections or higher toughness requirements; 39NiCrMo3 for cost-effective smaller parts.
Frequently Asked Questions
Is 39NiCrMo3 the same as 34CrNiMo6?
39NiCrMo3 and 34CrNiMo6 have a 75% composition overlap. Both NiCrMo QT steels — 34CrNiMo6 has more Ni+Cr for larger sections
Can I replace 39NiCrMo3 with 34CrNiMo6?
In many cases, yes. The compositions overlap significantly (75%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 39NiCrMo3 and 34CrNiMo6?
The main differences are in the following elements: C, Cr, Ni. 39NiCrMo3 is a Alloy Steel grade, while 34CrNiMo6 is a Alloy Steel grade.
Related Comparisons
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.