409L Stainless Steel Welded Pipe with Polished Surface for Automotive Exhaust Systems
409L welded pipe is a chromium, titanium-stabilized ferritic stainless steel specifically designed for automotive exhaust systems. With 11% chromium content, it forms a protective passive surface film that provides excellent corrosion resistance while offering medium strength, good formability, and cost-effectiveness.
Grade 409L stainless steel provides superior corrosion resistance compared to carbon steel, making it ideal for mildly challenging environments where corrosion resistance and high-temperature oxidation properties are essential. This alloy prioritizes mechanical performance and durability over aesthetic appearance.
| Element | C | Mn | Si | P | S | Cr | Ni | Ti |
|---|---|---|---|---|---|---|---|---|
| 409L | max: 0.03 | max: 1.0 | max: 1.0 | max: 0.045 | max: 0.045 | min: 10.5 max: 11.75 |
max: 0.5 | min: 0.48 max: 0.75 |
| Grade | Tensile Strength MPa (min) | Yield Strength 0.2% MPa (min) | Elongation % | Hardness (HB) MAX | Hardness (HRB) MAX |
|---|---|---|---|---|---|
| 409L | 380 | 207 | 20 | 207 | 95 |
While primarily designed for automotive exhaust systems, Alloy 409L has proven successful in various industrial applications:
- Automotive exhaust systems
- Catalytic converters
- Mufflers and tailpipes
- Farm equipment components
- Structural support and hangers
- Transformer cases
- Furnace components
- Heat exchanger tubing
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