100Cr6 vs 31CrMoV9: 29% composition overlap. Significantly different materials serving different application areas.
100Cr6 vs 31CrMoV9
Side-by-side chemical composition and mechanical property comparison.
Overview
100Cr6
1.3505
High-carbon chromium bearing steel. The most widely used bearing steel worldwide. Extremely high hardness and wear resistance after heat treatment. Standard for ball and roller bearings, precision shafts, and measuring instruments.
31CrMoV9
1.8519
THE standard nitriding steel — Cr-Mo-V combination optimized for gas nitriding. Vanadium refines grain and forms hard VN nitrides (surface >750 HV). Better core toughness than 31CrMo12 at similar strength. THE default choice when "nitriding steel" is specified without further detail. Used for crankshafts, gears, spindles, extrusion screws, and precision machine components.
| 100Cr6 | 31CrMoV9 | |
|---|---|---|
| Material Number | 1.3505 | 1.8519 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN ISO 683-17 | EN 10085 |
Chemical composition (wt%)
| Element | 100Cr6 | 31CrMoV9 | Overlap |
|---|---|---|---|
| C | 0.93–1.05% | 0.27–0.34% | No overlap |
| Si | 0.15–0.35% | 0–0.4% | OK |
| Mn | 0.25–0.45% | 0.4–0.7% | Partial |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | 100Cr6 | 31CrMoV9 | Unit |
|---|---|---|---|
| hardness_hrc | 60–66 | — | HRC |
| hardness_hb | ≤ 223 | — | HB |
| e_modulus | ≥ 210 | ≥ 210 | GPa |
Compatibility Assessment
100Cr6 and 31CrMoV9 have significantly different compositions (29% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 100Cr6 the same as 31CrMoV9?
100Cr6 and 31CrMoV9 have a 29% composition overlap. They are generally not directly interchangeable.
Can I replace 100Cr6 with 31CrMoV9?
Generally not recommended. The compositions differ significantly (29% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 100Cr6 and 31CrMoV9?
The main differences are in the following elements: C, Mn, Cr, Mo. 100Cr6 is a Alloy Steel grade, while 31CrMoV9 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.