50CrVA vs 6150
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
50CrVA
Alloy & Engineering Steel
50CrVA is China’s GB/T 1222 designation of the global 51CrV4 / AISI 6150 spring steel — the vanadium-bearing Cr spring grade for automotive suspension and valve springs.
Standards: DIN 1.8159 (51CrV4) · AISI 6150 · JIS SUP10 · GB 50CrVA (GB/T 1222)
6150
Alloy & Engineering Steel
6150 is a Cr-V spring steel: the vanadium refines grain and lifts fatigue strength, making it the premium choice for highly stressed springs, torsion bars and gears. EN 51CrV4 (1.8159) and GB 50CrVA are the same grade family.
Standards: DIN 1.8159 (51CrV4) · AISI 6150 · JIS SUP10 · GB 50CrVA
Chemical composition compared (%)
| Element | 50CrVA | 6150 |
|---|---|---|
| C | 0.46–0.54 | 0.48–0.53 |
| Si | 0.17–0.37 | 0.15–0.35 |
| Mn | 0.50–0.80 | 0.70–0.90 |
| P | ≤0.035 | ≤0.035 |
| S | ≤0.035 | ≤0.040 |
| Cr | 0.80–1.10 | 0.80–1.10 |
| V | 0.10–0.20 | ≥0.15 |
Properties compared
| Property | 50CrVA | 6150 |
|---|---|---|
| Hardness (Q&T) | 42–50 HRC typical | 34–46 HRC typical |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Fatigue performance | Excellent — the premium automotive spring grade | — |
| Tensile strength | — | 1100–1350 MPa (Q&T, typ.) |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: 50CrVA · 6150. Substitution decisions for certified parts stay with the design authority.