... pipe,Screen pipe and Large Diameter Pipe ,Coupling and all kinds of material Seamless Steel Pipe.Annual output near ... ,MSS,JIS,DIN.Material:ASTM A106/A53 GRB/API 5L/ API 5CT/Q345/A335/ST37/ST52/X 40-X65 ... pipe,Screen pipe and Large Diameter Pipe ,Coupling and all kinds of material Seamless Steel Pipe.Annual output near ... ,MSS,JIS,DIN.Material:ASTM A106/A53 GRB/API 5L/ API 5CT/Q345/A335/ST37/ST52/X 40-X65 ...