ASTM 409 Stainless Steel: Cost-Effective Ferritic Grade for Automotive Exhaust Systems
Jan 08, 2026
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409 Stainless Steel is a ferritic steel known for its good mechanical properties and resistance to oxidation at high temperatures. This grade is primarily used in automotive exhaust systems due to its balance of corrosion resistance, strength, and affordability. It contains chromium and is stabilized by titanium to enhance its weldability, forming a protective oxide layer for corrosion resistance.
Chemical Composition of 409 Stainless Steel
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 10.5 – 11.75 |
| Nickel (Ni) | ≤ 0.5 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Titanium (Ti) | 6 x C – 0.75 |
| Iron (Fe) | Balance |
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