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Stainless Steel

  • Author:Jack Zou
  • Source:www.diecastingpartsupplier.com
  • Release on:2014-12-19
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In metallurgy, stainless steel, also known as inox steel or inox from French "inoxydable", is a
steel alloy with a minimum of 10.5% chromium content by mass.

Stainless steel does not readily corrode, rust or stain with water as ordinary steel does.
However, it is not fully stain-proof in low-oxygen, high-salinity, or poor air-circulation
environments.[2] There are different grades and surface finishes of stainless steel to suit the
environment the alloy must endure. Stainless steel is used where both the properties of steel and
corrosion resistance are required.

Stainless steel differs from carbon steel by the amount of chromium present. Unprotected carbon
steel rusts readily when exposed to air and moisture. This iron oxide film (the rust) is active
and accelerates corrosion by forming more iron oxide; and, because of the greater volume of the
iron oxide, this tends to flake and fall away. Stainless steels contain sufficient chromium to
form a passive film of chromium oxide, which prevents further surface corrosion by blocking
oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal's
internal structure, and, due to the similar size of the steel and oxide ions, they bond very
strongly and remain attached to the surface.[3]

Passivation occurs only if the proportion of chromium is high enough and oxygen is present.