S25C 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.
S25C
Carbon Steel
S25C is the JIS G4051 carbon steel at 0.25% carbon — the Japanese designation matching AISI 1025. It sits between the mild steels and the heat-treatable medium-carbon grades: weldable and formable, with modest strength in the normalized condition.
Standards: DIN C25 (1.0406, near) · AISI 1025 · JIS S25C (JIS G4051) · GB 25
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 | S25C | 1025 |
|---|---|---|
| C | 0.22–0.28 | 0.22–0.28 |
| Si | 0.15–0.35 | — |
| Mn | 0.30–0.60 | 0.30–0.60 |
| P | ≤0.030 | ≤0.040 |
| S | ≤0.035 | ≤0.050 |
Properties compared
| Property | S25C | 1025 |
|---|---|---|
| Tensile strength | ≥440 MPa (normalized, JIS reference) | 430–520 MPa (normalized, typ.) |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Weldability | Good | 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: S25C · 1025. Substitution decisions for certified parts stay with the design authority.