23MnB4 vs 34CrAlNi7: 0% composition overlap. Significantly different materials serving different application areas.
23MnB4 vs 34CrAlNi7
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.
34CrAlNi7
1.8550
THE classic aluminum-containing nitriding steel — Al 0.8-1.2% forms extremely hard AlN nitrided layer (900-1100 HV surface). Cr 1.0-1.3% + Ni 0.85-1.15% provide core strength. Highest achievable surface hardness of all nitriding steels. Used for cylinder liners, piston rings, crankshafts, spindles, and gauges where maximum nitrided hardness is critical. Also known as 34CrAlNi7-10.
| 23MnB4 | 34CrAlNi7 | |
|---|---|---|
| Material Number | 1.5535 | 1.8550 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10263-4 | EN 10085 |
Chemical composition (wt%)
| Element | 23MnB4 | 34CrAlNi7 | Overlap |
|---|---|---|---|
| C | 0.2–0.27% | 0.3–0.37% | No overlap |
| Si | 0–0.4% | — | — |
| Mn | 0.8–1.1% | 0.4–0.7% | No overlap |
| P | 0–0.025% | — | — |
Mechanical properties
| Property | 23MnB4 | 34CrAlNi7 | Unit |
|---|---|---|---|
| tensile_strength | 830–1040 | 830–1030 | MPa |
| yield_strength | 660–830 | 590–740 | MPa |
| elongation | 9–14 | 12–16 | % |
Compatibility Assessment
23MnB4 and 34CrAlNi7 have significantly different compositions (0% 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 34CrAlNi7?
23MnB4 and 34CrAlNi7 have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace 23MnB4 with 34CrAlNi7?
Generally not recommended. The compositions differ significantly (0% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 23MnB4 and 34CrAlNi7?
The main differences are in the following elements: C, Mn. 23MnB4 is a Alloy Steel grade, while 34CrAlNi7 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.