23MnB4 vs 51CrV4: 57% composition overlap. Moderate differences, generally not direct substitutes.
23MnB4 vs 51CrV4
Side-by-side chemical composition and mechanical property comparison.
Overview
23MnB4
1.5535
Cold-heading boron steel — optimized for cold forming of high-strength fasteners. Boron gives hardenability equivalent to much more expensive Cr-Mo alloys. Supplied spheroidized for cold heading, then quenched+tempered after forming. Property class 10.9 bolts are commonly made from this grade. Used for high-strength bolts (M8-M24), screws, studs, and threaded fasteners for automotive and construction.
51CrV4
1.8159
Chromium-vanadium spring steel. The most important European spring steel grade. Excellent fatigue resistance and high elastic limit after heat treatment. Used for coil springs, leaf springs, torsion bars, anti-roll bars, and high-strength fasteners.
| 23MnB4 | 51CrV4 | |
|---|---|---|
| Material Number | 1.5535 | 1.8159 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10263-4 | EN 10089 |
Chemical composition (wt%)
| Element | 23MnB4 | 51CrV4 | Overlap |
|---|---|---|---|
| C | 0.2–0.27% | 0.47–0.55% | No overlap |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.8–1.1% | 0.7–1.1% | OK |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | 23MnB4 | 51CrV4 | Unit |
|---|---|---|---|
| tensile_strength | 830–1040 | 1100–1300 | MPa |
| yield_strength | 660–830 | ≥ 900 | MPa |
| elongation | 9–14 | ≥ 9 | % |
Compatibility Assessment
23MnB4 and 51CrV4 have moderate differences (57% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 23MnB4 the same as 51CrV4?
23MnB4 and 51CrV4 have a 57% composition overlap. They are generally not directly interchangeable.
Can I replace 23MnB4 with 51CrV4?
Generally not recommended. The compositions differ significantly (57% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 23MnB4 and 51CrV4?
The main differences are in the following elements: C. 23MnB4 is a Alloy Steel grade, while 51CrV4 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.