409 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.
409
Stainless Steel
409 is a titanium-stabilised 11% chromium ferritic stainless developed for automotive exhaust systems. It offers enough oxidation and corrosion resistance for exhaust service at the lowest cost of any stainless family member.
Standards: DIN 1.4512 · AISI 409 · JIS SUS409L (close) · GB 06Cr11Ti
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 | 409 | 430 |
|---|---|---|
| C | ≤0.08 | ≤0.12 |
| Si | ≤1.00 | ≤1.00 |
| Mn | ≤1.00 | ≤1.00 |
| P | ≤0.045 | ≤0.040 |
| S | ≤0.045 | ≤0.030 |
| Cr | 10.50–11.75 | 16.00–18.00 |
| Ni | ≤0.50 | ≤0.75 |
| Ti | 6×C–0.75 | — |
Properties compared
| Property | 409 | 430 |
|---|---|---|
| Delivery condition | Annealed | Annealed |
| Hardness | ≤183 HB (annealed) | ≤183 HB (annealed) |
| Tensile strength | 380–550 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: 409 · 430. Substitution decisions for certified parts stay with the design authority.