Chemical Composition (wt%)
| Item | Specification / Description |
|---|
| C | 0.62～0.70 |
| Si | 0.17～0.37 |
| Mn | 0.90～1.20 |
| P | ≤0.035 |
| S | ≤0.035 |
| Cr | ≤0.25 |
| Ni | ≤0.30 |
| Cu | ≤0.25 |
Standards
| Item | Specification / Description |
|---|
| Standard / designation | GB/T 1222 |
| Standard / designation | equivalent AISI1066 |
| Standard / designation | DIN1.0904 |
Tempers & Hardness
| Item | Specification / Description |
|---|
| ANN annealed | HB ≤302, for forming before heat treatment |
| Cold rolled hard | HV320～420 |
| Quenched & tempered | HRC42～50 |
| Note | Elasticity from quenching & tempering. Magnetic. Poor corrosion resistance, anti-rust coating required. Susceptible to overheating & temper brittleness, oil quenching recommended. |
Surface Finishes
| Item | Specification / Description |
|---|
| Specification | Hot rolled black, annealed dull, blued, phosphated, bright quenched, polished |
Size Range
| Item | Specification / Description |
|---|
| Cold rolled sheet | 0.2～3.0 mm; Hot rolled plate:3.0～60 mm. Laser cutting & slitting available |
Features
- Cost-effective spring steel, better hardenability than 65# carbon steel. Low ductility, poor weldability. Service temp ≤120℃, rusts easily without coating.
Applications
Clutch reeds, brake springs, flat springs, clock springs, blade blanks, wear shims, machinery & agricultural elastic parts
Material Selection Guide
Comparison 65Mn: economical carbon spring steel, rust prone SK85: higher carbon, higher hardness, brittle 50CrVA: alloy spring steel, heat & relaxation resistant 301 SS sheet: corrosion resistant, work-hardened, not heat treatable
