38MnB5
1.5531Boron press-hardening steel — higher C (0.36-0.42%) than 22MnB5 (0.20-0.25%) for higher final strength (UTS ~1800 MPa vs ~1500 for 22MnB5). Used for ultra-high-strength automotive structural parts where 22MnB5 is not strong enough: A/B-pillar reinforcements, bumper beams, door intrusion beams. Hot-stamped at 880-950°C then die-quenched to full martensite.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇪🇺 | EN | Europe | 38MnB5 / 1.5531 | 1.5531 | 100% |
Sources: EN 10083-3
Chemical composition comparison (wt%)
Side-by-side: 38MnB5 (EN 10083-3) vs 38MnB5 / 1.5531 (EN) (EN 10083-3)
| Element | 38MnB5 (EN 10083-3) | 38MnB5 / 1.5531 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.36–0.42% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
38MnB5 and 38MnB5 / 1.5531: 100% composition match
Related materials
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16MnCr5
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