It is stainless steel. Heat-resistant. Corrosion-resistant steel. It is austenitic stainless steel. For the national standard, it is 0Cr17Ni12Mo2. It is a better stainless steel than 304. In sea water and other various media. Corrosion resistance is better than 0Cr19Ni9. It is mainly resistant to pitting corrosion. material. It is widely used in auto parts, aviation and aerospace hardware tools, and chemical industry. The details are as follows: handicrafts, bearings, sliding flowers, medical equipment, electrical appliances, etc.