409 is an alloy designed principally for the automotive exhaust industry, although it has been used successfully in other industrial applications. It combines good elevated temperature corrosion resistance with medium strength, good formability and overall cost. In recent years, however, and with the upcoming US government requirement for a 100,00 mile exhaust capability, other alloys have been becoming more prevalent.
Mechanical Properties Of Stainless Steel 409 Sheets and Plates
| Grade/Temper | Tensile Strength ksi (min.) | Yield Strength 0.2% ksi (min.) | Elongation -% in 50 mm (min.) |
|---|---|---|---|
| SS 409 | 380 MPa | 170 MPa | 20.00% |
Equivalents 409 – S40910, EN 1.4512 1.4509 – (Similar) S44100, 441 Typical applications
Both 409 and 1.4509 have good corrosion resistance at higher temperatures than standard ferritics and are best utilised in mildly corrosive environments where resistance to scaling at moderate temperatures is required.



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