410 vs 403
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.
410
Stainless Steel
410 is the basic martensitic stainless steel, the lowest-cost grade that can be hardened by heat treatment. It trades corrosion resistance (12% chromium only) for strength, hardness and wear resistance.
Standards: DIN 1.4006 · AISI 410 · JIS SUS410 · GB 12Cr13
403
Stainless Steel
403 is a 12% chromium martensitic stainless developed for steam turbine blades, where controlled cleanliness and temper response matter more than maximum hardness. It is the quality-controlled sibling of 410.
Standards: DIN 1.4000 · AISI 403 · JIS SUS403 · GB 12Cr13
Chemical composition compared (%)
| Element | 410 | 403 |
|---|---|---|
| C | 0.08–0.15 | ≤0.15 |
| Si | ≤1.00 | ≤0.50 |
| Mn | ≤1.00 | ≤1.00 |
| P | ≤0.040 | ≤0.040 |
| S | ≤0.030 | ≤0.030 |
| Cr | 11.50–13.50 | 11.50–13.00 |
Properties compared
| Property | 410 | 403 |
|---|---|---|
| Delivery condition | Annealed or hardened & tempered | Annealed or hardened & tempered |
| Hardness (hardened) | 35–45 HRC typical | 35–45 HRC typical |
| Tensile strength | 485–1400 MPa (condition dependent) | 485–1400 MPa (condition dependent) |
| Density | 7.70 g/cm³ | 7.70 g/cm³ |
| Magnetic | Yes | Yes |
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: 410 · 403. Substitution decisions for certified parts stay with the design authority.