1055 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.
1055
Carbon Steel
1055 is a high-medium carbon steel for parts needing a hard, wear-resistant surface with a resilient core. It overlaps the lower spring range and is common in agricultural and hand-tool applications.
Standards: DIN 1.0535 (C55) · AISI 1055 · JIS S55C · GB 55
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 | 1055 | 1050 |
|---|---|---|
| C | 0.50–0.60 | 0.48–0.55 |
| Mn | 0.60–0.90 | 0.60–0.90 |
| P | ≤0.040 | ≤0.040 |
| S | ≤0.050 | ≤0.050 |
Properties compared
| Property | 1055 | 1050 |
|---|---|---|
| Tensile strength | 650–780 MPa (normalized, typ.) | 620–740 MPa (normalized, typ.) |
| 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: 1055 · 1050. Substitution decisions for certified parts stay with the design authority.