434 vs 430
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.
434
Stainless Steel
434 adds about 1% molybdenum to the 430 base, improving pitting resistance and giving it the best corrosion performance of the straight-chromium ferritic grades below the stabilised super-ferritics. It is a traditional automotive trim grade.
Standards: DIN 1.4113 · AISI 434 · JIS SUS434 · GB 10Cr17Mo
430
Stainless Steel
430 is the most widely used ferritic stainless steel, a 17% chromium, nickel-free grade with good corrosion resistance in mild atmospheres and excellent resistance to nitric acid. It is the standard grade for appliance trim and decorative sheet.
Standards: DIN 1.4016 · AISI 430 · JIS SUS430 · GB 10Cr17
Chemical composition compared (%)
| Element | 434 | 430 |
|---|---|---|
| C | ≤0.12 | ≤0.12 |
| Si | ≤1.00 | ≤1.00 |
| Mn | ≤1.00 | ≤1.00 |
| P | ≤0.040 | ≤0.040 |
| S | ≤0.030 | ≤0.030 |
| Cr | 16.00–18.00 | 16.00–18.00 |
| Mo | 0.75–1.25 | — |
| Ni | — | ≤0.75 |
Properties compared
| Property | 434 | 430 |
|---|---|---|
| Delivery condition | Annealed | Annealed |
| Hardness | ≤183 HB (annealed) | ≤183 HB (annealed) |
| Tensile strength | 450–630 MPa | 450–600 MPa |
| Density | 7.70 g/cm³ | 7.70 g/cm³ |
| Magnetic | Yes | Yes |
| Yield strength | — | ≥205 MPa |
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: 434 · 430. Substitution decisions for certified parts stay with the design authority.