Casing Pipe, Seamless Steel Pipe, High Pressure Boiler Tube manufacturer / supplier in China, offering A335 SA335 SA335m ASTM ASME A335 P5 P9 P11 P22 P91 P92 Hot Rolled Seamless Steel Tube, Sch40/Sch80/Sch160 ASTM A106 Gr. B/ API5l Black Seamless Steel Pipe, SAE4140 4130 4340 42CrMo 30CrMo Steel Round Bar SAE4130 Steel Bar and so on.