🟧 Product Overview
409 stainless steel is one of the most widely used ferritic stainless steels in the automotive industry. It offers:
- Good oxidation resistance
- Stable performance at elevated temperatures
- Cost‑effective composition with low nickel
- Good weldability and formability
- Suitable for continuous thermal cycling
Because of its balance of performance and cost, 409 is the global standard material for automotive exhaust systems.
🟧 Key Features
- Excellent heat resistance up to ~675°C
- Good corrosion resistance in exhaust gas environments
- Low nickel content for cost stability
- Good weldability for exhaust system fabrication
- Magnetic ferritic structure
🟧 Standards
- ASTM A240 / A480
- JIS G4304 / G4305 (SUS409L)
- EN 10088‑2 (1.4512)
- GB/T 3280
🟧 Chemical Composition (Typical)
| Element | 409 (%) |
|---|
| C | ≤0.03 |
| Cr | 10.5–11.75 |
| Ni | ≤0.5 |
| Mn | ≤1.0 |
| Si | ≤1.0 |
| Ti | Stabilized |
| Fe | Balance |
Note: Titanium stabilization improves weldability and reduces the risk of intergranular corrosion.
🟧 Mechanical Properties (Typical)
| Property | Value |
|---|
| Yield Strength | ≥170 MPa |
| Tensile Strength | ≥380 MPa |
| Elongation | ≥20% |
🟧 Product Specifications
Thickness
Width
Surface Finishes
🟧 Applications
Automotive Exhaust Systems
- Mufflers
- Exhaust pipes
- Catalytic converter shells
- Resonators
- Tailpipes
Heat‑Resistant Industrial Applications
- Heat shields
- Thermal processing equipment
- Furnace components (moderate temperature)
🟧 Why Choose WelSteels
- Professional supply of 409 stainless steel coil
- Automotive‑grade quality control
- Stable heat‑resistant performance
- SGS / BV inspection available
- Export‑grade seaworthy packaging
