... engaged in the Casing ,Tubing and Slot pipe,Screen pipe and Large Diameter Pipe ,Coupling and all kinds of material ... 10M-1996,API,ANSI,GB,MSS,JIS,DIN.Material:ASTM A106/A53 GRB/API 5L/ API 5CT/Q345/ ... engaged in the Casing ,Tubing and Slot pipe,Screen pipe and Large Diameter Pipe ,Coupling and all kinds of material ... 10M-1996,API,ANSI,GB,MSS,JIS,DIN.Material:ASTM A106/A53 GRB/API 5L/ API 5CT/Q345/ ...