50CrMo4
1.7228High-carbon Cr-Mo steel for springs and high-strength applications. Higher carbon than 42CrMo4 for greater hardness and spring properties. Used for coil springs, leaf springs, torsion bars, highly stressed bolts, and heavy-duty shafts.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 4150 | G41500 | REF |
| 🇪🇺 | EN | Europe | 50CrMo4 | 1.7228 | 100% |
| 🇨🇳 | GB | China | 50CrMo | — | 95% |
| 🇯🇵 | JIS | Japan | SCM450 | — | 93% |
Sources: ASTM A29, EN 10083-3:2006, GB/T 3077, JIS G4105
Chemical composition comparison (wt%)
Side-by-side: 50CrMo4 (EN) (EN 10083-3:2006) vs 50CrMo (GB)
| Element | 50CrMo4 (EN) | 50CrMo (GB) | Overlap |
|---|---|---|---|
| C | 0.46–0.54% | — | — |
| Si | 0–0.4% | — | — |
| Mn | 0.5–0.8% | — | — |
| P | 0–0.025% | — | — |
| S | 0–0.035% | — | — |
| Cr | 0.9–1.2% | — | — |
| Mo | 0.15–0.3% | — | — |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 1000–1200 | MPa |
| Yield Strength | ≥ 780 | MPa |
| Elongation | ≥ 10 | % |
| Hardness HRC | 30–37 | HRC |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| normalizing | 840–870 °C | air | min 2 min per mm | — |
| quenching | 820–860 °C | oil | min 30 min | Oil quench preferred |
| tempering | 540–660 °C | air | min 60 min | — |
| annealing | 680–720 °C | furnace | Several hours | Soft annealing |
Compatibility verdict
50CrMo4 and 50CrMo: 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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