23MnB4 vs 27MnCrB5-2: 72% composition overlap. Some similarities but notable differences in alloying elements.
23MnB4 vs 27MnCrB5-2
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.
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).
| 23MnB4 | 27MnCrB5-2 | |
|---|---|---|
| Material Number | 1.5535 | 1.7182 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10263-4 | EN 10083-3 |
Chemical composition (wt%)
| Element | 23MnB4 | 27MnCrB5-2 | Overlap |
|---|---|---|---|
| C | 0.2–0.27% | 0.24–0.3% | Partial |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.8–1.1% | 1.1–1.4% | Partial |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | 23MnB4 | 27MnCrB5-2 | Unit |
|---|---|---|---|
| tensile_strength | 830–1040 | 900–1100 | MPa |
| yield_strength | 660–830 | ≥ 700 | MPa |
| elongation | 9–14 | ≥ 12 | % |
Compatibility Assessment
23MnB4 and 27MnCrB5-2 share some characteristics (72% overlap) but have notable differences. They may be substitutable in some applications but not all. Verify suitability carefully.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 23MnB4 the same as 27MnCrB5-2?
23MnB4 and 27MnCrB5-2 have a 72% composition overlap. For most purposes, they can be considered similar.
Can I replace 23MnB4 with 27MnCrB5-2?
In many cases, yes. The compositions overlap significantly (72%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 23MnB4 and 27MnCrB5-2?
The main differences are in the following elements: C, Mn. 23MnB4 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.