ASTM A240 409L Titanium Stabilized Cold Rolled Stainless Steel Sheet for Automotive Exhaust Grade
ASTM A240 409L cold rolled stainless steel sheet is a titanium-stabilized ferritic grade specifically developed for automotive exhaust system components and weldable applications requiring moderate corrosion and oxidation resistance. The titanium addition stabilizes the ferritic structure, preventing hardening and intergranular corrosion in the weld heat-affected zone, making 409L the most widely specified stainless steel for exhaust systems worldwide.
With lower chromium content (10.5-11.75%) compared to 430, 409L offers an optimal balance of performance and economy. The cold rolled 2B finish provides a smooth, uniform surface suitable for tube making, stamping, and forming operations.
| Parameter | Specification |
|---|---|
| Standard | ASTM A240 / ASME SA240 |
| Steel Grade | 409L (UNS S40910, EN 1.4512) |
| Manufacturing Process | Cold Rolled |
| Thickness Range | 0.4mm - 4.0mm |
| Width Range | 1000mm, 1219mm, 1500mm |
| Length Range | 2000mm, 2438mm, 3000mm or Custom |
| Surface Finish | 2B, BA, Dull Finish |
| Edge Condition | Mill Edge, Slit Edge |
| Stabilization | Titanium Stabilized |
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤0.030 |
| Manganese (Mn) | ≤1.00 |
| Silicon (Si) | ≤1.00 |
| Phosphorus (P) | ≤0.040 |
| Sulfur (S) | ≤0.030 |
| Chromium (Cr) | 10.5 - 11.75 |
| Nickel (Ni) | ≤0.50 |
| Titanium (Ti) | 6*(C+N) min, ≤0.75 max |
| Property | Value |
|---|---|
| Tensile Strength (min) | ≥380 MPa |
| Yield Strength (0.2% offset, min) | ≥170 MPa |
| Elongation (min) | ≥20% |
| Hardness (max) | ≤179 HBW / ≤88 HRB |
- Automotive Exhaust: Catalytic converter shells, mufflers, exhaust pipes, manifold covers
- Automotive Structural: Heat shields, chassis components, brackets, support frames
- Industrial: Transformer cases, electrical enclosures, furnace parts
- Heat Exchange: Low-pressure heat exchanger tubing, economizer components
- Agricultural Equipment: Silo components, grain handling equipment, fertilizer spreaders
- Construction: Roofing panels, cladding, flashings in mildly corrosive environments
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