Stainless steelis an iron-carbon alloy with a minimum of 10.5% chrome. Stainless steel is not stain proof but it "stains less" than steel. It is also refered to as "corrosion resistant" steel. There are many grades of stainless steel used for a variety of different purposes. It is used in small everyday items such as table flatware & cutlery, watch bands, pens, surgical instruments. Some larger uses are the Arch in St. Louis, Mossuri and the Chrysler Building in New York City which are both clad in stainless steel to protect the structures from the corrosive environment.