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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. 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. Due to the similar size of the steel and oxide ions, they bond very strongly and remain attached to the surface