42CrMo4 vs 34CrNiMo6: Different alloy concepts for high-strength applications
42CrMo4 vs 34CrNiMo6
Side-by-side chemical composition and mechanical property comparison.
Overview
42CrMo4
1.7225
High-strength quenched and tempered chromium-molybdenum steel. Widely used for shafts, gears, crankshafts, connecting rods, and high-strength bolts. Excellent hardenability and good fatigue resistance.
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.
| 42CrMo4 | 34CrNiMo6 | |
|---|---|---|
| Material Number | 1.7225 | 1.6582 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10083-3 | EN 10083-3 |
Chemical composition (wt%) — Pro
| Element | 42CrMo4 | 34CrNiMo6 | Overlap |
|---|---|---|---|
| C | 0.38–0.45% | 0.3–0.38% | Partial |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.6–0.9% | 0.5–0.8% | Partial |
| P | 0–0.025% | 0–0.025% | OK |
| S | |||
| Cr | |||
| Mo | |||
| Ni |
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Sign up free — 3 comparisons/day freeMechanical properties — Pro
| Property | 42CrMo4 | 34CrNiMo6 | Unit |
|---|---|---|---|
| Tensile Strength | 900–1100 | 1000–1200 | MPa |
| Yield Strength | ≥ 650 | ≥ 800 | MPa |
| Elongation | ≥ 12 | ≥ 11 | % |
| Hardness HRC | |||
| Elastic Modulus | |||
| Density |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
34CrNiMo6 adds 1.3-1.7% nickel for superior toughness and hardenability in large cross-sections. Choose 34CrNiMo6 for shafts >100mm diameter.
Frequently Asked Questions
Is 42CrMo4 the same as 34CrNiMo6?
42CrMo4 and 34CrNiMo6 have a 65% composition overlap. Different alloy concepts for high-strength applications
Can I replace 42CrMo4 with 34CrNiMo6?
Generally not recommended. The compositions differ significantly (65% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 42CrMo4 and 34CrNiMo6?
The main differences are in the following elements: C, Mn, Cr. 42CrMo4 is a Alloy Steel grade, while 34CrNiMo6 is a Alloy Steel grade.
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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.