25 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.
25
Carbon Steel
25 is the GB/T 699 carbon steel between 1020 and 1030 in carbon content, matching AISI 1025 / JIS S25C. A general machinery steel for lightly loaded shafts and fasteners.
Standards: DIN 1.0406 (C25) · AISI 1025 · JIS S25C · GB 25 (GB/T 699)
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 | 25 | 1025 |
|---|---|---|
| C | 0.22–0.29 | 0.22–0.28 |
| Si | 0.17–0.37 | — |
| Mn | 0.50–0.80 | 0.30–0.60 |
| P | ≤0.035 | ≤0.040 |
| S | ≤0.035 | ≤0.050 |
| Cr | ≤0.25 | — |
Properties compared
| Property | 25 | 1025 |
|---|---|---|
| Tensile strength | ≥450 MPa (GB/T 699 reference, normalized blank) | 430–520 MPa (normalized, typ.) |
| Yield strength | ≥275 MPa (reference) | — |
| 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: 25 · 1025. Substitution decisions for certified parts stay with the design authority.