50 vs 1050
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.
50
Carbon Steel
50 is the GB/T 699 grade matching AISI 1050 and JIS S50C, a higher-carbon machinery steel for parts needing spring-like hardness response without alloying.
Standards: DIN 1.0540 (C50) · AISI 1050 · JIS S50C · GB 50 (GB/T 699)
1050
Carbon Steel
1050 is a medium-high carbon steel whose chemistry matches JIS S50C and EN C50. It is used for wear-exposed shafts, springs of simple form and parts that are flame or induction hardened.
Standards: DIN 1.0540 (C50) · AISI 1050 · JIS S50C · GB 50
Chemical composition compared (%)
| Element | 50 | 1050 |
|---|---|---|
| C | 0.47–0.55 | 0.48–0.55 |
| Si | 0.17–0.37 | — |
| Mn | 0.50–0.80 | 0.60–0.90 |
| P | ≤0.035 | ≤0.040 |
| S | ≤0.035 | ≤0.050 |
| Cr | ≤0.25 | — |
Properties compared
| Property | 50 | 1050 |
|---|---|---|
| Tensile strength | ≥630 MPa (GB/T 699 reference, normalized blank) | 620–740 MPa (normalized, typ.) |
| Yield strength | ≥375 MPa (reference) | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Hardness | — | 55+ HRC surface by induction |
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: 50 · 1050. Substitution decisions for certified parts stay with the design authority.