18CrNiMo7-6 vs 27MnCrB5-2: 50% composition overlap. Moderate differences, generally not direct substitutes.
18CrNiMo7-6 vs 27MnCrB5-2
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.
27MnCrB5-2
1.7182
Manganese-chromium-boron steel for direct hardening and hot stamping. Boron addition (0.0008-0.005%) dramatically improves hardenability at low cost. The standard grade for automotive press-hardened body-in-white components (B-pillar, side impact beams, bumper reinforcements).
| 18CrNiMo7-6 | 27MnCrB5-2 | |
|---|---|---|
| Material Number | 1.6587 | 1.7182 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10084 | EN 10083-3 |
Chemical composition (wt%)
| Element | 18CrNiMo7-6 | 27MnCrB5-2 | Overlap |
|---|---|---|---|
| C | 0.15–0.21% | 0.24–0.3% | No overlap |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.5–0.9% | 1.1–1.4% | No overlap |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | 18CrNiMo7-6 | 27MnCrB5-2 | Unit |
|---|---|---|---|
| hardness_hrc | 58–62 | — | HRC |
| tensile_strength | 1050–1350 | 900–1100 | MPa |
| hardness_hb | ≤ 229 | — | HB |
Compatibility Assessment
18CrNiMo7-6 and 27MnCrB5-2 have moderate differences (50% 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 27MnCrB5-2?
18CrNiMo7-6 and 27MnCrB5-2 have a 50% composition overlap. They are generally not directly interchangeable.
Can I replace 18CrNiMo7-6 with 27MnCrB5-2?
Generally not recommended. The compositions differ significantly (50% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 18CrNiMo7-6 and 27MnCrB5-2?
The main differences are in the following elements: C, Mn, Cr. 18CrNiMo7-6 is a Alloy Steel grade, while 27MnCrB5-2 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.