Casing Pipe, Seamless Steel Pipe, High Pressure Boiler Tube manufacturer / supplier in China, offering ASTM A53 A106 Gr. B API 5L Gr. B Gr B Black Seamless Carbon Steel Pipe, A106 Gr. B Seamless Pipe Smls 3 Inch Sch40 /ASTM A53 Gr. B Carbon Steel Pipe Seamless Pipe Pakistan, 20inch Sch40 Std ASTM A106 Gr. B API 5L 20"Diameter Steel Pipe Black Line Pipe and so on.