Seamless Steel Pipe

Structural seamless pipe (GB/T8162-2008) is a kind of seamless steel pipe used for general structure and mechanical structure. The fluid seamless steel pipe standard applies to seamless steel pipes that transport fluids. 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%, higher up to 1.20%) alloy elements for deoxidation, structural steel pipes , without other alloying elements (except residual elements). Such structural steel pipes 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 below 0.020%, it is called super high-quality structural steel pipe, and its grade should be followed by Add "E...