Many manufacturers have reduced chromium and nickel and increased the content of manganese in stainless steel due to cost considerations. But the reason why stainless steel can be stainless is because of the presence of chromium and nickel. Reducing the content of these two components will reduce the antirust performance.
Stainless steel is formed on its surface by a layer of extremely thin, firm and dense stable chromium-rich oxide film (protective film). Prevent oxygen atoms from continuing to infiltrate and continue to oxidize, so as to obtain anti-corrosion ability. Once for some reason, this film is continuously damaged, the oxygen atoms in the air or liquid will be continuously separated to form loose iron oxide, and the metal surface will be continuously rusted.
