42CrMo4 vs 25CrMo4: Same alloy family, different carbon levels
42CrMo4 vs 25CrMo4
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.
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.
| 42CrMo4 | 25CrMo4 | |
|---|---|---|
| Material Number | 1.7225 | 1.7218 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10083-3 | EN 10083-3 |
Chemical composition (wt%)
| Element | 42CrMo4 | 25CrMo4 | Overlap |
|---|---|---|---|
| C | 0.38–0.45% | 0.22–0.29% | No overlap |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.6–0.9% | 0.6–0.9% | OK |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | 42CrMo4 | 25CrMo4 | Unit |
|---|---|---|---|
| tensile_strength | 900–1100 | 700–900 | MPa |
| yield_strength | ≥ 650 | ≥ 500 | MPa |
| elongation | ≥ 12 | ≥ 14 | % |
Compatibility Assessment
Both are Cr-Mo steels from EN 10083-3. 42CrMo4 has higher carbon (0.38-0.45% vs 0.22-0.29%) giving higher strength but worse weldability. Choose 25CrMo4 where welding is required.
Frequently Asked Questions
Is 42CrMo4 the same as 25CrMo4?
42CrMo4 and 25CrMo4 have a 75% composition overlap. Same alloy family, different carbon levels
Can I replace 42CrMo4 with 25CrMo4?
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 42CrMo4 and 25CrMo4?
The main differences are in the following elements: C. 42CrMo4 is a Alloy Steel grade, while 25CrMo4 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.