18CrNiMo7-6 vs 30CrMoV9: 28% composition overlap. Significantly different materials serving different application areas.
18CrNiMo7-6 vs 30CrMoV9
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.
30CrMoV9
1.7707
THE Cr-Mo-V nitriding steel — Cr 2.3-2.7% forms hard CrN nitrided case (800 HV surface). V addition for secondary hardening. Core QT to UTS 1080-1270 MPa before nitriding at 570-580°C. Used for piston rods, valve stems, cylinder liners, turbine parts, and any component needing extreme surface hardness + fatigue resistance without distortion (low nitriding temp).
| 18CrNiMo7-6 | 30CrMoV9 | |
|---|---|---|
| Material Number | 1.6587 | 1.7707 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10084 | EN 10085 |
Chemical composition (wt%) — Pro
| Element | 18CrNiMo7-6 | 30CrMoV9 | Overlap |
|---|---|---|---|
| C | 0.15–0.21% | 0.26–0.34% | No overlap |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.5–0.9% | 0.4–0.7% | Partial |
| P | 0–0.025% | — | — |
| S | |||
| Cr | |||
| Mo | |||
| Ni | |||
| V |
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Sign up free — 3 comparisons/day freeMechanical properties — Pro
| Property | 18CrNiMo7-6 | 30CrMoV9 | Unit |
|---|---|---|---|
| Hardness HRC | 58–62 | — | HRC |
| Tensile Strength | 1050–1350 | 1080–1270 | MPa |
| Hardness HB | ≤ 229 | — | HB |
| Elastic Modulus | |||
| Density | |||
| Yield Strength | |||
| Elongation | |||
| hardness_hv |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
18CrNiMo7-6 and 30CrMoV9 have significantly different compositions (28% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 18CrNiMo7-6 the same as 30CrMoV9?
18CrNiMo7-6 and 30CrMoV9 have a 28% composition overlap. They are generally not directly interchangeable.
Can I replace 18CrNiMo7-6 with 30CrMoV9?
Generally not recommended. The compositions differ significantly (28% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 18CrNiMo7-6 and 30CrMoV9?
The main differences are in the following elements: C, Mn, Cr, Mo. 18CrNiMo7-6 is a Alloy Steel grade, while 30CrMoV9 is a Alloy Steel grade.
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.