Stainless steel derives its name from the fact that it doesn’t get rust stains like ordinary carbon steel— but does that mean that it’s always completely stainless?
Stainless steel can in fact corrode if the oxygen in the environment is low enough. When chromium is added to steel, it reacts with oxygen in the atmosphere to form chromium oxide, a thin, invisible passive film. If the metal is cut or scratched, more oxide will quickly form and recover the exposed surface to prevent corrosion.
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Source: acceleratingscience.com
Siobhan R.//SMC Editor
Shanghai Metal Corporation 
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