Steel Pipe, Steel Coil, Steel Sheet manufacturer / supplier in China, offering ASTM A36 St52 Q235 Q345 Q355 Q500 Hot Rolled Round Welded Seamless Carbon Steel Tube Pipe, Customized Sales Carbon Steel 16mo3 Sch 20 Large Diameter Alloy Steel Seamless Steel Pipe, Black Iron Steel Tube Pipe Carbon Sch40 Inch Seamless Od 40mm 42mm 45mm 48mm 50mm 51mm 54mm for Construction and so on.