18CrNiMo7-6 vs 51CrV4: 51% composition overlap. Moderate differences, generally not direct substitutes.
18CrNiMo7-6 vs 51CrV4
Side-by-side chemical composition and mechanical property comparison.
Overview
18CrNiMo7-6
1.6587
Premium Cr-Ni-Mo case-hardening steel for the most demanding gear applications. Excellent core toughness and hardenability for large cross-sections. The standard gear steel for wind turbines, heavy-duty gearboxes, and aerospace gearing.
51CrV4
1.8159
Chromium-vanadium spring steel. The most important European spring steel grade. Excellent fatigue resistance and high elastic limit after heat treatment. Used for coil springs, leaf springs, torsion bars, anti-roll bars, and high-strength fasteners.
| 18CrNiMo7-6 | 51CrV4 | |
|---|---|---|
| Material Number | 1.6587 | 1.8159 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10084 | EN 10089 |
Chemical composition (wt%) — Pro
| Element | 18CrNiMo7-6 | 51CrV4 | Overlap |
|---|---|---|---|
| C | 0.15–0.21% | 0.47–0.55% | No overlap |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.5–0.9% | 0.7–1.1% | Partial |
| P | 0–0.025% | 0–0.025% | OK |
| S | |||
| Cr | |||
| Mo | |||
| Ni | |||
| V |
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Sign up free — 3 comparisons/day freeMechanical properties — Pro
| Property | 18CrNiMo7-6 | 51CrV4 | Unit |
|---|---|---|---|
| Hardness HRC | 58–62 | 36–42 | HRC |
| Tensile Strength | 1050–1350 | 1100–1300 | MPa |
| Hardness HB | ≤ 229 | — | HB |
| Elastic Modulus | |||
| Density | |||
| Yield Strength | |||
| Elongation |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
18CrNiMo7-6 and 51CrV4 have moderate differences (51% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 18CrNiMo7-6 the same as 51CrV4?
18CrNiMo7-6 and 51CrV4 have a 51% composition overlap. They are generally not directly interchangeable.
Can I replace 18CrNiMo7-6 with 51CrV4?
Generally not recommended. The compositions differ significantly (51% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 18CrNiMo7-6 and 51CrV4?
The main differences are in the following elements: C, Mn, Cr. 18CrNiMo7-6 is a Alloy Steel grade, while 51CrV4 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.