Stainless steel

Stainless steel is an iron-based alloy that contains chromium, making it resistant to rust and corrosion. Alternatively, it is known as inox, corrosion-resistant steel (CRES), Nirosta or rustless steel. Stainless steel's resistance to corrosion comes from its chromium content of 10.

5% or more, which forms a passive film that protects the material and can self-heal when exposed to oxygen.
It can be further alloyed with elements like molybdenum, carbon, nickel and nitrogen to enhance specific properties for various applications.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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