Stainless steel is composed of carbon, iron, chromium, nickel, manganese, molybdenum and other elements in different proportions. In Taiwan, they are collectively called "white iron". To achieve the purpose of not rusting, the chromium content must be more than 10.5%, because chromium (Cr) will form a chromium oxide protective film on the steel surface to prevent rust. Stainless steel is divided into five categories according to its crystal structure: Ostian stainless steel (a1, a2, a3, a4, a5), ferritic stainless steel (f1), Asada bulk stainless steel (c1, c4, c3), duplex stainless steel and precipitation hardening stainless steel.
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