1045 vs S50C
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
1045
Carbon Steel
1045 is the world’s most common medium-carbon steel — the default for shafts, hydraulic rods and plates that need more strength than mild steel, with optional induction hardening.
Standards: DIN 1.0503 (C45) · AISI 1045 · JIS S45C · GB 45
S50C
Carbon Steel
S50C is the JIS medium-carbon steel slightly richer in carbon than S45C/1045, popular in Asian supply chains for machine parts, shafts and mold plates.
Standards: DIN 1.0540 (C50) · AISI 1050 · JIS S50C · GB 50
Chemical composition compared (%)
| Element | 1045 | S50C |
|---|---|---|
| C | 0.43–0.50 | 0.47–0.53 |
| Si | 0.15–0.35 (typ.) | 0.15–0.35 |
| Mn | 0.60–0.90 | 0.60–0.90 |
| P | ≤0.040 | ≤0.030 |
| S | ≤0.050 | ≤0.035 |
Properties compared
| Property | 1045 | S50C |
|---|---|---|
| Tensile strength | 570–700 MPa (normalized) | 610–760 MPa (normalized) |
| Hardness | 170–210 HB (normalized); 50+ HRC surface by induction | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: 1045 · S50C. Substitution decisions for certified parts stay with the design authority.