Casing Pipe, Seamless Steel Pipe, High Pressure Boiler Tube manufacturer / supplier in China, offering Factory Supply 25crmo4 34CrMo4 42CrMo4 50crmo4 Seamless alloy Steel Pipe for automobile, ASTM A179 Seamless Cold Drawn Carbon Steel Pipes ASTM A179 ASME SA179 Heat Exchanger and Condenser Tubes, Hot Rolled Carbon Steel Plate Sheet ASTM A36 Q235 Ss400 Grade 2mm~150mm Steel Plate and so on.