What Is Stainless Steel? | Metal Glossary | Industrial Metal Supply
Stainless steel is defined as a steel alloy with a minimum of 10% chromium content by mass.
  1. Stainless steel does not stain, corrode, or rust as easily as ordinary steel (it stains less), but it is not stain-proof.
  2. It is also called corrosion-resistant steel or CRES when the alloy type and grade are not detailed, particularly in the aviation industry. There are different grades and surface finishes of stainless steel to suit the environment to which the material will be subjected in its lifetime. Common uses of stainless steel are cutlery and watch straps.
Stainless steel differs from carbon steel by amount of chromium present. Carbon steel rusts when exposed to air and moisture. This iron oxide film is active and accelerates corrosion by forming more iron oxide. Stainless steels have sufficient amount of chromium present so that a passive film of chromium oxide forms which prevents further surface corrosion and blocks corrosion spreading in the metal's internal structure.

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