25CrMo4 vs 40CrNiMo6: 43% composition overlap. Significantly different materials serving different application areas.
25CrMo4 vs 40CrNiMo6
Side-by-side chemical composition and mechanical property comparison.
Overview
25CrMo4
1.7218
Medium-carbon chromium-molybdenum steel with good toughness and weldability. Used for seamless tubes, pressure vessels, aircraft structural parts, and automotive components. Better weldability than 42CrMo4 due to lower carbon.
40CrNiMo6
1.6565
High-strength Cr-Ni-Mo quench and temper steel. Higher C than 34CrNiMo6 for greater strength, with excellent hardenability from Ni+Mo combination. Used for heavy-duty crankshafts, connecting rods, high-strength bolts (class 12.9), gears, and critical structural components in large cross-sections.
| 25CrMo4 | 40CrNiMo6 | |
|---|---|---|
| Material Number | 1.7218 | 1.6565 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10083-3 | EN 10083-3 |
Chemical composition (wt%) — Pro
| Element | 25CrMo4 | 40CrNiMo6 | Overlap |
|---|---|---|---|
| C | 0.22–0.29% | 0.36–0.44% | No overlap |
| 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 | 25CrMo4 | 40CrNiMo6 | Unit |
|---|---|---|---|
| Tensile Strength | 700–900 | 1000–1200 | MPa |
| Yield Strength | ≥ 500 | ≥ 800 | MPa |
| Elongation | ≥ 14 | ≥ 10 | % |
| Hardness HRC | |||
| Elastic Modulus | |||
| Density |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
25CrMo4 and 40CrNiMo6 have significantly different compositions (43% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 25CrMo4 the same as 40CrNiMo6?
25CrMo4 and 40CrNiMo6 have a 43% composition overlap. They are generally not directly interchangeable.
Can I replace 25CrMo4 with 40CrNiMo6?
Generally not recommended. The compositions differ significantly (43% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 25CrMo4 and 40CrNiMo6?
The main differences are in the following elements: C, Mn, Cr. 25CrMo4 is a Alloy Steel grade, while 40CrNiMo6 is a Alloy Steel grade.
Related Comparisons
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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.