What is the material of 308 stainless steel?

Stainless steel belongs to metal material stainless steel, which refers to steel that is resistant to weak corrosive media such as air, steam and water and chemical corrosive media such as acid, alkali and salt. It is also called stainless acid-resistant steel.

. In practical application, steel resistant to weak corrosive medium is usually called stainless steel, while steel resistant to chemical medium is called acid-resistant steel. Because of the different chemical composition, the former is not necessarily resistant to the corrosion of chemical media, 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 are nickel, molybdenum, titanium, niobium, copper, nitrogen and so on. In order to meet the requirements of various uses for the microstructure and properties of stainless steel. Stainless steel is easily corroded by chloride ions, because chromium, nickel and chlorine are allophanates, which will exchange and assimilate to form corrosion of stainless steel.

The corrosion resistance of chemical composition stainless steel decreases with the increase of carbon content. Therefore, the carbon content of most stainless steels is relatively low, with the maximum not exceeding 1.2%, and the Wc (carbon content) of some steels is even lower than 0.03% (for example, 00Cr 12). The main alloying element in stainless steel is Cr (chromium), and only when the Cr content reaches a certain value can the steel have corrosion resistance. Therefore, the Cr content of stainless steel is at least 10.5%. Stainless steel also contains elements such as nickel, titanium, manganese, nitrogen, niobium, molybdenum, silicon and copper. Stainless steel is not prone to corrosion, pitting, rust or wear. Stainless steel is also one of the strongest building metal materials. Because stainless steel has good corrosion resistance, it can permanently maintain the integrity of engineering design. Chromium-containing stainless steel also has both mechanical strength and high ductility, which is easy to manufacture and meets the needs of architects and structural designers.