1030 vs 1025
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.
1030
Carbon Steel
1030 is a medium carbon steel at the lower edge of the heat-treatable range: it responds to quenching in thin sections and to induction hardening on shafts. It is a widely used forging steel for automotive and agricultural parts.
Standards: DIN 1.0528 (C30) · AISI 1030 · JIS S30C · GB 30
1025
Carbon Steel
1025 is a low-medium carbon steel for general machinery parts that need a step up in strength from 1020 while keeping good weldability and formability. It is a common forging grade for lightly loaded components.
Standards: DIN 1.0406 (C25) · AISI 1025 · JIS S25C · GB 25
Chemical composition compared (%)
| Element | 1030 | 1025 |
|---|---|---|
| C | 0.28–0.34 | 0.22–0.28 |
| Mn | 0.60–0.90 | 0.30–0.60 |
| P | ≤0.040 | ≤0.040 |
| S | ≤0.050 | ≤0.050 |
Properties compared
| Property | 1030 | 1025 |
|---|---|---|
| Tensile strength | 470–560 MPa (normalized, typ.) | 430–520 MPa (normalized, typ.) |
| Hardness | 50+ HRC surface by induction (thin sections) | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Weldability | — | Good |
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: 1030 · 1025. Substitution decisions for certified parts stay with the design authority.