Stainless steel is a metal material stainless steel (Stainless Steel) refers to the steel that is resistant to weak corrosive media such as air, steam, water, and chemical corrosive media such as acid, alkali, salt, etc., also known as stainless acid-resistant steel. In practical applications, steels that are resistant to weak corrosive media are often referred to as stainless steel, while steels that are resistant to chemical media corrosion are called acid-resistant steel. Due to the difference in chemical composition between the two, the former is not necessarily resistant to chemical medium corrosion, while the latter is generally stainless. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel. The basic alloying elements of stainless steel include nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various applications for the structure and properties of stainless steel. Stainless steel is easily corroded by chloride ions, because chromium, nickel, and chlorine are isotopes, and isotopes will be interchanged and assimilated to form corrosion of stainless steel. The corrosion resistance of stainless steel decreases with the increase of carbon content. Therefore, the carbon content of most stainless steels is low, the maximum does not exceed 1.2%, and the Wc (carbon content) of some steels is even lower than 0.03% (such as 00Cr12). The main alloying element in stainless steel is Cr (chromium). Only when the Cr content reaches a certain value can the steel have corrosion resistance. Therefore, stainless steel generally has a Cr (chromium) content of at least 10.5%. Stainless steel also contains Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other elements. Stainless steel is not prone to corrosion, pitting, rust or wear. Stainless steel is also one of the strongest building metal materials. Due to its good corrosion resistance, stainless steel can permanently maintain the integrity of the engineering design. Chromium-containing stainless steel also combines mechanical strength and high elongation, making it easy to process and manufacture components, meeting the needs of architects and structural designers