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AISI 409 Stainless Steel Foil

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Properties common to all products in this list

Commodity: Alloys Material: Stainless Steel Form: Foil/Film/Sheet Composition: Fe/Cr 11.7/Mn 0.5/Si0.5/Ti 0.4/Ni 0.3/C/P/S Grade: AISI 409 UNS Number: S40900 Temper: Annealed
AISI 409 Stainless Steel Foil is a ferritic chromium stainless steel (Fe/Cr 11) offering good oxidation resistance at moderate temperatures, high thermal conductivity relative to austenitic grades, and a lower coefficient of thermal expansion. Its ferritic microstructure imparts magnetic permeability and moderate mechanical strength, with good formability and weldability in thin-section applications. Cost-effective compared to higher-alloyed grades, AISI 409 provides reliable performance in mildly corrosive environments where moderate oxidation resistance is required. It is widely used in automotive exhaust system components, catalytic converter substrates and heat shields, muffler liners, and agricultural equipment. In R&D settings, it serves as a substrate for magnetometry studies, magnetic shielding prototypes, and catalytic substrate investigations in automotive emissions research.
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Material Properties

Mechanical Properties
Element Value
Hardness - Brinell ≤131
Elongation at break( % ) ≥25
Modulus of elasticity( GPa ) 200
Tensile strength( MPa ) ≥450
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 60
Thermal Properties
Element Value
Melting point( C ) 1450-1510
Thermal conductivity( W m⁻¹ K⁻¹ ) 25.8@100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 11.0@0-100°C
Physical Properties
Element Value
Density( gcm⁻³ ) 7.8
each

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Available Configurations

Properties common to all products in this list

Commodity: Alloys Material: Stainless Steel Form: Foil/Film/Sheet Composition: Fe/Cr 11.7/Mn 0.5/Si0.5/Ti 0.4/Ni 0.3/C/P/S Grade: AISI 409 UNS Number: S40900 Temper: Annealed

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Tolerances

Foil/Film/Sheet
Thickness <0.01mm ±25%
Thickness 0.01mm - 0.05mm ±15%
Thickness >0.05mm ±10%