Chemical Composition (wt%)
| Item | Specification / Description |
|---|
| C | 0.47～0.53 |
| Si | 0.15～0.35 |
| Mn | 0.60～0.90 |
| P | ≤0.030 |
| S | ≤0.035 |
Standards
| Item | Specification / Description |
|---|
| Standard / designation | JIS G4051 |
| Standard / designation | Equivalent GB 50# |
| Standard / designation | AISI1050 |
| Standard / designation | DIN CK50 (1.1206) |
Tempers & Hardness
| Item | Specification / Description |
|---|
| Annealed | 143～187 HB |
| Normalized | 179～235 HB |
| Quenched & tempered | HRC28～42 |
| Note | Hardenable by heat treatment, magnetic. Medium carbon steel, NOT spring steel. Poor rust resistance, surface coating required. |
Surface Finishes
| Item | Specification / Description |
|---|
| Specification | Hot rolled black, machined ground, annealed dull, black oxide, phosphated |
Size Range
| Item | Specification / Description |
|---|
| Cold rolled sheet | 0.5～3.0 mm; Hot rolled plate:3.0～200 mm. Precision grinding & laser cutting available |
Features
- Higher strength & wear resistance than S45C. Good machinability. Limited ductility, not ideal for springs.
Applications
Mold back plates, jig base, sliding blocks, gear blanks, wear shims, fixture components
Material Selection Guide
Comparison S45C: More ductile, easier machining S50C: Higher hardness & wear resistance 65Mn: Spring steel for flat springs & reeds S55C: Higher carbon, harder, more brittle
