| C | Si | Mn | S/P | Cr | V | Ni | Cu |
| 0.46～0.54 | 0.17～0.37 | 0.50～0.80 | ≤0.030 | 0.80～1.10 | 0.10～0.20 | ≤0.35 | ≤0.25 |
Good mechanical and processing properties, high hardenability, addition of vanadium refines the grain size of steel, reduces overheating sensitivity, improves strength and toughness, has high fatigue strength, high yield ratio, but poor weldability and low cold deformation plasticity. It is a higher grade spring used for high load important springs with larger cross-sections, as well as valve springs, piston springs, safety valve springs, etc. with working temperatures<300 ℃.
Automotive industry
High speed heavy-duty locomotives
Mechanical manufacturing industry
| C | Si | Mn | S/P | Cr | V | Ni | Cu |
| 0.46～0.54 | 0.17～0.37 | 0.50～0.80 | ≤0.030 | 0.80～1.10 | 0.10～0.20 | ≤0.35 | ≤0.25 |
Good mechanical and processing properties, high hardenability, addition of vanadium refines the grain size of steel, reduces overheating sensitivity, improves strength and toughness, has high fatigue strength, high yield ratio, but poor weldability and low cold deformation plasticity. It is a higher grade spring used for high load important springs with larger cross-sections, as well as valve springs, piston springs, safety valve springs, etc. with working temperatures<300 ℃.
Automotive industry
High speed heavy-duty locomotives
Mechanical manufacturing industry
