18CrNiMo7-6 vs 8620 / 20NiCrMo2-2: 43% composition overlap. Significantly different materials serving different application areas.
18CrNiMo7-6 vs 8620 / 20NiCrMo2-2
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.
8620 / 20NiCrMo2-2
1.6523
Nickel-chromium-molybdenum case-hardening steel. Good combination of core toughness and case hardness. The most widely used case-hardening steel in the US (AISI 8620). Used for gears, pinions, worm drives, king pins, and cross-shafts.
| 18CrNiMo7-6 | 8620 / 20NiCrMo2-2 | |
|---|---|---|
| Material Number | 1.6587 | 1.6523 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10084 | EN 10084 |
Chemical composition (wt%)
| Element | 18CrNiMo7-6 | 8620 / 20NiCrMo2-2 | Overlap |
|---|---|---|---|
| C | 0.15–0.21% | 0.17–0.23% | Partial |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.5–0.9% | 0.65–0.95% | Partial |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | 18CrNiMo7-6 | 8620 / 20NiCrMo2-2 | Unit |
|---|---|---|---|
| hardness_hrc | 58–62 | 58–62 | HRC |
| tensile_strength | 1050–1350 | 800–1100 | MPa |
| hardness_hb | ≤ 229 | ≤ 212 | HB |
Compatibility Assessment
18CrNiMo7-6 and 8620 / 20NiCrMo2-2 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 18CrNiMo7-6 the same as 8620 / 20NiCrMo2-2?
18CrNiMo7-6 and 8620 / 20NiCrMo2-2 have a 43% composition overlap. They are generally not directly interchangeable.
Can I replace 18CrNiMo7-6 with 8620 / 20NiCrMo2-2?
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 18CrNiMo7-6 and 8620 / 20NiCrMo2-2?
The main differences are in the following elements: C, Mn, Cr, Mo. 18CrNiMo7-6 is a Alloy Steel grade, while 8620 / 20NiCrMo2-2 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.
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