Stainless steel castings are the general term for steel castings produced with various stainless steel materials, and are mainly used under various media corrosion conditions. It has been discovered as early as 1910 that when the Cr content in steel exceeds 12%, it has good corrosion resistance and oxidation resistance. In addition to containing more than 12% Cr, typical stainless steel also contains one or more other alloying elements, such as Ni, Mo, Cu, Nb, Ti and N2.
According to the chemical composition, stainless steel has two categories: Cr stainless steel, Cr and Ni stainless steel. The main influence on the corrosion performance of stainless steel is the C content and precipitated carbides, so the lower the C content of the corrosion-resistant stainless steel, the better, usually C≤0.08%, but the high temperature mechanical properties of heat-resistant steel are determined by its stability in the structure The carbide precipitation phase, so the C content of heat-resistant steel is higher, generally the carbon content is more than 0.20%.