23MnB4 vs 42CrMo4: 53% composition overlap. Moderate differences, generally not direct substitutes.
23MnB4 vs 42CrMo4
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.
42CrMo4
1.7225
High-strength quenched and tempered chromium-molybdenum steel. Widely used for shafts, gears, crankshafts, connecting rods, and high-strength bolts. Excellent hardenability and good fatigue resistance.
| 23MnB4 | 42CrMo4 | |
|---|---|---|
| Material Number | 1.5535 | 1.7225 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10263-4 | EN 10083-3 |
Chemical composition (wt%)
| Element | 23MnB4 | 42CrMo4 | Overlap |
|---|---|---|---|
| C | 0.2–0.27% | 0.38–0.45% | No overlap |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.8–1.1% | 0.6–0.9% | Partial |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | 23MnB4 | 42CrMo4 | Unit |
|---|---|---|---|
| tensile_strength | 830–1040 | 900–1100 | MPa |
| yield_strength | 660–830 | ≥ 650 | MPa |
| elongation | 9–14 | ≥ 12 | % |
Compatibility Assessment
23MnB4 and 42CrMo4 have moderate differences (53% 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 42CrMo4?
23MnB4 and 42CrMo4 have a 53% composition overlap. They are generally not directly interchangeable.
Can I replace 23MnB4 with 42CrMo4?
Generally not recommended. The compositions differ significantly (53% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 23MnB4 and 42CrMo4?
The main differences are in the following elements: C, Mn. 23MnB4 is a Alloy Steel grade, while 42CrMo4 is a Alloy Steel grade.
Related Comparisons
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.