AISI 420 Stainless Steel Foil

AISI 420 Stainless Steel Foil is a martensitic, high-chromium alloy that delivers high hardness, excellent wear resistance, and moderate corrosion protection in thin sheet form. This foil is particularly valued for applications demanding precision, strength, and surface stability under mechanical stress. It is widely used in aerospace, automotive, and medical device manufacturing, where tight dimensional tolerances and performance in mildly corrosive environments are critical. Specific technologies benefiting from this alloy include surgical instrument fabrication, high-precision spring elements, and micro-mechanical components. Research on AISI 420 foil explores tribological performance under varying lubrication regimes, welding compatibility with dissimilar steels, and enhancement of hardness through advanced coatings. Its balance of mechanical performance, machinability, and stability in demanding service environments makes it indispensable in both high-tech engineering and precision industrial manufacturing.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Foil

Thickness	<0.01mm	±25%
Thickness	0.01mm - 0.05mm	±25%
Thickness	>0.05mm	±10%

Material Properties for Alloys

Mechanical Properties

Element	Value
Elongation at break( % )	>12
Modulus of elasticity( GPa )	200
Tensile strength( MPa )	860

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	55
Temperature coefficient( K⁻¹ )	-

Thermal Properties

Element	Value
Melting point( C )	1450
Specific heat( J K⁻¹ kg⁻¹ )	460@23°C
Thermal conductivity( W m⁻¹ K⁻¹ )	24.9@100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	10.3@0-100°C