17CrNiMo6 vs 18CrNiMo7-6: 87% composition overlap. Some similarities but notable differences in alloying elements.
17CrNiMo6 vs 18CrNiMo7-6
Side-by-side chemical composition and mechanical property comparison.
Overview
17CrNiMo6
1.6587
Premium CrNiMo case hardening steel for demanding gear applications. Ni 1.2-1.5% + Mo 0.25-0.35% give excellent core toughness and deep hardenability — suitable for large gears up to 400mm ruling section. Surface HRC 60-63 after carburizing. THE wind turbine gearbox steel. Also used for large industrial gearboxes, mining equipment, and heavy truck transmissions.
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.
| 17CrNiMo6 | 18CrNiMo7-6 | |
|---|---|---|
| Material Number | 1.6587 | 1.6587 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10084 | EN 10084 |
Chemical composition (wt%)
| Element | 17CrNiMo6 | 18CrNiMo7-6 | Overlap |
|---|---|---|---|
| C | 0.15–0.21% | 0.15–0.21% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.5–0.9% | 0.5–0.9% | OK |
| P | — | 0–0.025% | — |
Mechanical properties
| Property | 17CrNiMo6 | 18CrNiMo7-6 | Unit |
|---|---|---|---|
| hardness_hrc | 60–63 | 58–62 | HRC |
| tensile_strength | 1000–1300 | 1050–1350 | MPa |
| yield_strength | 700–1000 | — | MPa |
Compatibility Assessment
17CrNiMo6 and 18CrNiMo7-6 share some characteristics (87% overlap) but have notable differences. They may be substitutable in some applications but not all. Verify suitability carefully.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 17CrNiMo6 the same as 18CrNiMo7-6?
17CrNiMo6 and 18CrNiMo7-6 have a 87% composition overlap. For most purposes, they can be considered similar.
Can I replace 17CrNiMo6 with 18CrNiMo7-6?
In many cases, yes. The compositions overlap significantly (87%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 17CrNiMo6 and 18CrNiMo7-6?
The main differences are in the following elements: Ni. 17CrNiMo6 is a Alloy Steel grade, while 18CrNiMo7-6 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.