Steel Tube, Seamless Steel Tube, Steel Pipe manufacturer / supplier in China, offering Carbon Steel Seamless Pipes for Boiler and Heat Exchanger ASTM/ASME SA179 SA192, ASTM A53/A106/ API 5L Gr. B Sch40/Sch80 Seamless Carbon Steel Tubes, ASTM A53/A106/ API 5L Gr. B Sch40/Sch80 Seamless Carbon Steel Pipe and so on.