Stainless Steel metal dome

The material of metal dome (snap dome) is most used the stainless steel. But what’s the stainless steel and how can they oxygen-resistance? Ok, follow me to know the details:
Stainless Steel is essentially a low carbon steel which contains chromium at 10% or more by weight. It is the addition of chromium that gives the steel its unique stainless, corrosion resisting properties.
The chromium content of the steel allows the formation of a tough, adherent, invisible, corrosion-resisting chromium oxide film on the steel surface. If damaged mechanically or chemically, this film is self-healing, provided that oxygen, even in very small amounts is present.
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