This product is mainly composed of iron as a substrate, adding chromium (content usually ≥ 10.5%) and other alloying elements (such as nickel, molybdenum, titanium, etc.) alloy steel materials, and has a corrosion-resistant, high-temperature resistant, high-strength and easy to process and other characteristics. Materials can be divided into austenitic, ferrite, martensite, duplex and precipitation hardening stainless steel according to the organizational structure, according to the chemical composition can be divided into chromium stainless steel, chromium-nickel stainless steel, chromium-nickel-molybdenum stainless steel and so on.