23MnB4 vs 30CrMoV9: 36% composition overlap. Significantly different materials serving different application areas.
23MnB4 vs 30CrMoV9
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.
30CrMoV9
1.7707
THE Cr-Mo-V nitriding steel — Cr 2.3-2.7% forms hard CrN nitrided case (800 HV surface). V addition for secondary hardening. Core QT to UTS 1080-1270 MPa before nitriding at 570-580°C. Used for piston rods, valve stems, cylinder liners, turbine parts, and any component needing extreme surface hardness + fatigue resistance without distortion (low nitriding temp).
| 23MnB4 | 30CrMoV9 | |
|---|---|---|
| Material Number | 1.5535 | 1.7707 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10263-4 | EN 10085 |
Chemical composition (wt%)
| Element | 23MnB4 | 30CrMoV9 | Overlap |
|---|---|---|---|
| C | 0.2–0.27% | 0.26–0.34% | Partial |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.8–1.1% | 0.4–0.7% | No overlap |
| P | 0–0.025% | — | — |
Mechanical properties
| Property | 23MnB4 | 30CrMoV9 | Unit |
|---|---|---|---|
| tensile_strength | 830–1040 | 1080–1270 | MPa |
| yield_strength | 660–830 | ≥ 880 | MPa |
| elongation | 9–14 | ≥ 10 | % |
Compatibility Assessment
23MnB4 and 30CrMoV9 have significantly different compositions (36% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 23MnB4 the same as 30CrMoV9?
23MnB4 and 30CrMoV9 have a 36% composition overlap. They are generally not directly interchangeable.
Can I replace 23MnB4 with 30CrMoV9?
Generally not recommended. The compositions differ significantly (36% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 23MnB4 and 30CrMoV9?
The main differences are in the following elements: C, Mn. 23MnB4 is a Alloy Steel grade, while 30CrMoV9 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.