Steel Pipe, Stainless Steel, Galvanized Coil manufacturer / supplier in China, offering China 45#, 20g, St37, St52, 1010 1020 1045 S45c S20c S10c Welded Seamless Steel Pipe, ASTM API Q235 Q345 Hot Rolled Seamless Steel Pipe for Construction/Building, ASTM A179 20# Black Cold Drawn Carbon Seamless Steel Tube Used in Gas, Oil, Liquid and so on.