409L Stainless Steel Coil

The 409L Stainless Steel Coil is a titanium-stabilized ferritic grade offering excellent oxidation and corrosion resistance in high-temperature environments. This coil provides superior weldability and formality similar to carbon steel at a cost-effective price point.

Product Parameters

Thickness: We offer coils from 0.15mm to 8.0mm for cold rolled, and 3.0mm to 16.0mm for hot rolled options .
Width: Available widths range from 600mm to 2000mm .
Standard sizes: Common widths include 1000mm, 1219mm, 1250mm, and 1500mm .
Processing technology: We use hot rolling and cold rolling processes with annealing and pickling .
Execution standards: Products comply with ASTM A240, JIS G4304, EN 10088-2, and GB/T 3280 .
Packaging method: We secure coils with steel straps, protective wrapping, and waterproof paper on steel or wooden pallets for export .
Supported surface treatments: Options include No.1, 2B, 2D, BA, and pickled finishes. We support various surface customizations.

Chemical Composition (Typical %)

Carbon: 0.03 max .
Manganese: 1.0 – 2.0 max .
Phosphorus: 0.040 max .
Sulfur: 0.015 – 0.03 max .
Silicon: 1.0 max .
Chromium: 10.5 – 12.5 .
Nickel: 0.5 – 0.6 max .
Titanium: 6x(C+N) min for stabilization .
Iron makes up the balance.

Physical Properties

Density measures 7.7 – 7.8 g/cm³ .
Tensile strength reaches 380 – 450 MPa minimum .
Yield strength is 170 – 240 MPa minimum .
Elongation reaches 18-25% minimum in 50mm .
Hardness shows 88 HRB or 180-223 HB maximum .
Modulus of elasticity is 200 GPa .
Thermal conductivity measures 23.9 – 26.1 W/m·K at 100°C .
Electrical resistivity is 60 µΩ·cm at 20°C .
Maximum service temperature: 675-800°C for continuous service .

Product Applications for Automotive and Mechanical Industries

Automotive Industry Applications
The 409L Stainless Steel Coil serves as the primary material for complete exhaust system components including manifolds, exhaust pipes, front pipes, catalytic converter shells, mufflers, and tail pipes . Automotive manufacturers choose this 409L Stainless Steel Coil for heat shields, EGR systems, and exhaust gas recirculation components where high-temperature oxidation resistance matters . The automotive industry relies on this grade for its excellent weldability in thin sections without filler metal and its ability to withstand thermal cycling from cold starts to operating temperatures .

Mechanical Industry Applications
Industrial equipment manufacturers use this coil for heat exchangers, furnace parts, and combustion chambers requiring good thermal conductivity and oxidation resistance up to 675°C . Mechanical applications include industrial ducting, ventilation systems, chimney liners, and gas boiler components where cost-effective corrosion resistance outperforms carbon steel . The 409L Stainless Steel Coil also serves in agricultural equipment, electrical transformer cases, and heat exchanger tubing where formability and weldability similar to low alloy steels provide fabrication advantages .

This coil offers approximately 250 times better atmospheric corrosion resistance than mild steel, making it ideal for mildly corrosive mechanical environments . The titanium stabilization prevents intergranular corrosion after welding, ensuring long-term reliability in automotive and mechanical applications .

Supported surface treatments: Options include No.1, 2B, BA, 2D, No.4, HL, and 8K finishes . We support various surface customizations to meet your specific project requirements.