Grades & Chemical Composition (wt%)
| Item | Specification / Description |
|---|
| 50CrVA (51CrV4 / SUP10) C | 0.46～0.54, Si:0.17～0.37, Mn:0.50～0.80, Cr:0.80～1.10, V:0.10～0.20, P≤0.025, S≤0.025 |
| 60Si2Mn C | 0.56～0.64, Si:1.50～2.00, Mn:0.70～1.00, Cr≤0.35, P≤0.035, S≤0.035 |
| 55SiCr (SAE9254 / SUP12) C | 0.50～0.60, Si:1.20～1.60, Cr:0.50～0.80, Mn:0.50～0.80 |
Applicable Standards
| Item | Specification / Description |
|---|
| Standard / designation | GB/T 1222 |
| Standard / designation | GB/T 18983 |
| Standard / designation | JIS G3561 |
| Standard / designation | ASTM A228 |
| Standard / designation | EN 10270-1 |
Tempers & Hardness
| Item | Specification / Description |
|---|
| ANN annealed | 700～900 MPa, for coiling before heat treatment |
| Oil quenched & tempered (FD / TD) | |
| 50CrVA | HRC43～50 |
| 60Si2Mn | HRC45～52 |
| 55SiCr | HRC47～54 |
| Note | Strength from quenching & tempering, not cold drawing. Magnetic. Poor corrosion resistance, surface treatment required. |
Surface Finishes
| Item | Specification / Description |
|---|
| Specification | Bright OQT finish, blue tempered, phosphated, pickled, nickel plated |
Size Range
| Item | Specification / Description |
|---|
| Diameter | 0.5～16.0 mm, tolerance ±0.003~±0.01 mm. Round, flat & custom profile wire available, coils or spools. |
Features
- 50CrVA: V grain refinement, excellent fatigue & relaxation resistance, service temp up to 350℃, valve spring grade
- 60Si2Mn: Si-Mn alloy, cost-effective high load spring material, moderate heat resistance
- 55SiCr: High purity, superior fatigue limit, premium automotive spring grade
Applications
50CrVA: Engine valve springs, fuel pump springs, high temp torsion springs
60Si2Mn: Construction machinery springs, clutch & shock absorber springs
55SiCr: Automotive suspension springs, high-cycle fatigue compression springs
Material Selection Guide
Comparison 50CrVA: Heat resistant & good toughness 60Si2Mn: Economy heavy load 55SiCr: Top fatigue performance 65Mn: Carbon spring steel, low cost, not for high temperature 301/304 SS wire: Corrosion resistant, low heat resistance, work-hardened
