309 Stainless Steel Foil, Unpolished (Mill) Finish, Standard Tolerance, Inch
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309 Stainless Steel Foil, Unpolished (Mill) Finish, Standard Tolerance, Inch

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Product Specifications
Exterior Finish
Unpolished (Mill)
Item Shape
Material Composition
Material Type
Stainless Steel
System of Measurement

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0.002 inches 12 inches 100 feet 1 B002C3EM34 yes $245.50 Buy Options
0.002 inches 12 inches 50 feet 1 B002C582TC yes $124.96 Buy Options
0.002 inches 24 inches 100 feet 1 B002C3XZIC yes $477.42 Buy Options
0.002 inches 24 inches 50 feet 1 B002C4M60O yes $243.30 Buy Options

Key Features

  • 309 stainless steel provides similar corrosion resistance to 304 stainless steel but offers better resistance to high temperatures
  • Unpolished (mill) surface has no finish
  • Standard tolerance

Product Description

The 309 stainless steel foil has an unpolished (mill) surface and a standard tolerance. The 309 stainless steel grade provides the same corrosion resistance as general-purpose 304 stainless steel but has higher chromium and nickel content to better retain its properties in high temperatures. An austenitic stainless steel, 309 is typically nonmagnetic but may become slightly magnetic when cold worked.

Stainless steel is an iron alloy with resistance to staining and rusting in many environments where steel would typically degrade. The chemical composition of each grade creates a grain structure that falls into one of five classes: austenitic, duplex, ferritic, martensitic, and precipitation hardening. The austenitic class contains the most formable, weldable, and corrosion-resistant stainless steel grades, but they cannot be heat treated.

Tensile strength, used to indicate the material’s overall strength, is the peak stress it can withstand before it breaks. Corrosion resistance describes the material's ability to prevent deterioration caused by atmosphere, moisture, or other medium. Magnetism characterizes how much the material is repelled by or attracted to a magnet.

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