400 series stainless steel is an alloy of iron, carbon and chromium.
400 stainless steel is mainly ferrite and martensite, of which ferrite stainless steel usually does not contain nickel, has a large thermal conductivity, small coefficient of expansion, good oxidation resistance, excellent corrosion resistance and other characteristics.
Martensitic stainless steel, with high carbon content, is a kind of stainless steel whose properties can be adjusted by heating, that is to say, it can be processed by heating to improve its hardness, so it has high strength, high hardness and wear resistance. So 400 stainless steel has a strong resistance to high temperature oxidation, and will not be easily corroded and rusted.
Application of 400 series stainless steel
400 series stainless steel in the same chromium content, in the atmosphere, fresh water and nitric acid such as oxidizing media, its corrosion resistance is the same as the 300 series stainless steel, but also better than the 200 series stainless steel, the addition of trace niobium, titanium, copper, aluminum and other elements can improve the deep-drawn performance, weldability, corrosion resistance. The addition of trace niobium, copper, aluminum and other elements can improve its deep-drawn performance, weldability, corrosion resistance and high-temperature strength, can partially replace the 300 series stainless steel.
Now 400 series stainless steel is widely used in automobile exhaust, elevator, washing machine inner tube, kitchenware, home appliances, medical equipment, water heaters, roof panels, curtain walls and power plant equipment and other industry sectors, it can be said that such stainless steel is also quite widely used.