202 stainless steel is one of the 200 series stainless steels. The chemical composition is iron, manganese, aluminum, sodium, carbon, lime, carbon dioxide, bromine, and the density is 7.938 kg/cubic decimeter. The nickel content of 202 stainless steel is generally below 4%, and the manganese content is about 8%, which belongs to low nickel and high manganese stainless steel.
202 stainless steel is often associated with 304 stainless steel, mainly because both belong to the austenitic structure, without magnetism, and there is little difference in appearance.

Structural steel is commonly used for ground structures, welded structures, bridges, industrial machines and many other similar applications. Wide applications mean a wide range of specifications used. Good weldability is essential because the use of these products always involves welding. Strength matching the use and the specifications used is also required.

High-quality carbon structural steel: In addition to carbon (C) elements and a certain amount of silicon (Si) (generally no more than 0.40%) and manganese (Mn) (generally no more than 0.80%) for deoxidation, the steel can be as high as 1.20% %) alloying elements, without other alloying elements (except residual elements). Such steels must guarantee both chemical composition and mechanical properties. The content of sulfur (S) and phosphorus (P) impurity elements is generally controlled below 0.035%. If it is controlled below 0.030%, it is called high-grade high-quality steel, and “A” should be added after its grade, such as 20A; if P is controlled below 0.025% and S is controlled below 0.020%, it is called super-high-quality steel, and its grade should be followed by adding "E" for distinction. For other residual alloy elements brought into the steel from raw materials, such as chromium (Cr), nickel (Ni), copper (Cu), etc., the content is generally controlled at Cr≤0.25%, Ni≤0.30%, Cu≤0.25%. Some grades of manganese (Mn) content reach 1.40%, called manganese steel.