22MnB5
1.5528THE press hardening (hot stamping) boron steel — used in virtually every modern car for B-pillars, bumper beams, and side impact reinforcements. As-delivered: ferritic-pearlitic, UTS 450-750 MPa, formable. After hot stamping + die quenching: fully martensitic, UTS 1300-1650 MPa. Boron (0.002-0.005%) provides critical hardenability at low cost. Usually AlSi or Zn coated to prevent oxidation during austenitizing at 880-950°C.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇪🇺 | EN | Europe | 22MnB5 / 1.5528 | 1.5528 | 100% |
| 🇩🇪 | VDA | Germany | CR1100T-MB (VDA 239-500) | — | 95% |
Sources: EN 10083-3, VDA 239-500
Chemical composition comparison (wt%)
Side-by-side: 22MnB5 (EN) (EN 10083-3) vs CR1100T-MB (VDA 239-500) (VDA)
| Element | 22MnB5 (EN) | CR1100T-MB (VDA 239-500) (VDA) | Overlap |
|---|---|---|---|
| C | 0.2–0.25% | — | — |
| Si | 0–0.4% | — | — |
| Mn | 1.1–1.4% | — | — |
| P | 0–0.025% | — | — |
| S | 0–0.005% | — | — |
| Cr | 0–0.5% | — | — |
| Al | 0–0.08% | — | — |
| Ti | 0–0.05% | — | — |
| B | 0.0008–0.005% | — | — |
Mechanical properties
As Delivered
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 450–750 | MPa |
| Yield Strength | 300–600 | MPa |
| Elongation | 12–18 | % |
| Density | ≥ 7.85 | g/cm3 |
Press Hardened
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 1300–1650 | MPa |
| Yield Strength | 950–1250 | MPa |
| Elongation | 5–8 | % |
| Hardness HRC | 42–50 | HRC |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| austenitizing | 880–950 °C | roller hearth furnace | 3-10 min | Typically 6 min at 930°C in production |
| press_hardening | — | water-cooled dies | — | Cooling rate >27°C/s required for full martensite |
Compatibility verdict
22MnB5 and CR1100T-MB (VDA 239-500): 95% composition match
Close equivalents but NOT identical.
Related materials
50CrV4
1.8160Chromium-vanadium spring/tool steel — identical alloy system to 51CrV4 (1.8159) but recognized as a separate grade in some standards. Dual use: heavy-duty springs (EN 10089) AND cold work tools (knives, shear blades). V improves temper resistance and grain refinement. UTS 1200-1500 QT. Used for heavy leaf springs, stabilizer bars, torsion bars, and cold work cutting tools.
51CrMoV4
1.7701CrMoV alloyed spring steel — THE European automotive suspension spring material. CrMo gives deep hardenability for large coil springs, V adds grain refinement and secondary hardening for fatigue resistance. UTS 1350-1600 MPa QT. Used for hot-formed coil springs (cars, trucks), leaf springs, torsion bars, and stabilizer bars. Excellent sag resistance to 200°C.
20MnCr5
1.7147Manganese-chromium case-hardening steel with higher core strength than 16MnCr5. Used for heavily loaded gears, shafts, camshafts, and transmission components requiring high surface hardness with tough core. Popular in automotive and heavy machinery.
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