Increase the corrosion resistance of stainless steel with the carbon content decreases, and therefore, most of the lower carbon stainless steel volume, to a maximum of 1.2%, and some steel ωc (carbon content), and even less than 0.03% (e.g. 00Cr12 ). Stainless steel is the main alloying elements Cr (chromium), only when the Cr content reaches a certain value, there is corrosion resistance of steel. Therefore, stainless steel is generally Cr (chromium) content of at least 10.5%. Stainless steel also contains Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other elements.