What Makes Stainless Steel “Stainless”?

Unlike traditional steel, stainless steel does not rust or tarnish—hence its name. This property results from the chromium content within the alloy.

To create stainless steel, at least 10.5% chromium is added to an iron alloy. On the surface of the steel, the chromium forms a thin oxide layer (Cr2O3) known as the "passive layer." As a result, the steel is protected from corrosion. Higher corrosion resistance comes from increased chromium content, which prevents rust formation.

 

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