Chemical Composition (wt%)
| Item | Specification / Description |
|---|
| C | ≤0.15 |
| Si | ≤1.00 |
| Mn | ≤2.00 |
| P | ≤0.045 |
| S | ≤0.030 |
| Cr | 16.0～18.0 |
| Ni | 6.0～8.0 |
Standards
| Item | Specification / Description |
|---|
| Standard / designation | GB/T 3280 |
| Standard / designation | ASTM A240 / A666 |
| Standard / designation | JIS G4304 / G4305 |
| Standard / designation | EN 10088-2 (1.4310 |
| Standard / designation | S30100) |
Tempers & Hardness
| Item | Specification / Description |
|---|
| ANN annealed | Tensile ≥520 MPa, Rp0.2≥205 MPa, Elongation≥40%, HV≤200 |
| 1/4H | 250～310 HV；1/2H:310～370 HV；3/4H:370～430 HV |
| FH Full hard | 430～490 HV；EH Extra hard:490～550 HV |
| Note | Not heat-hardenable, strength only from cold rolling. Non-magnetic annealed, obvious magnetism after cold rolling. |
Surface Finishes
| Item | Specification / Description |
|---|
| Specification | 2B cold rolled dull, BA bright, NO.1 hot rolled pickled, NO.4 hairline, HL grain, 8K mirror (custom) |
Size Range
| Item | Specification / Description |
|---|
| Cold rolled sheet | 0.3～3.0 mm, tolerance ±0.02~±0.05 mm, standard sizes 1000×2000,1219×2438,1500×3000 |
| Hot rolled plate | 3.0～16 mm, tolerance ±0.3~±0.8 mm. Laser cutting & cut-to-size available |
Features
- Fast work-hardening, strong spring-back for high strength elastic parts
- Corrosion resistance inferior to 304, only for atmosphere & fresh water, NOT chloride environment
- Weldable, but cold-work strength disappears after welding, not for load-bearing elastic parts
Applications
Railway carriage panels, elevator reeds, battery contacts, connector springs, relay plates, spiral spring blanks, tape measure strips, precision elastic hardware
Material Selection Guide
Grade comparison 301 sheet: high spring-back, moderate corrosion resistance 304 sheet: better rust resistance, low spring force 316 sheet: chloride resistant, premium price
