... 3Grade:J55,K55,N80,L80 4Standard:API 5CT 5Thread:BTC,STC,LTC Oil casing pipeHuadong Industrial CO., LTD mainly engaged ... all kinds of material Seamless Steel Pipe.Annual output near 200,000 Ton. Oil casing pipe rang:Casing pipe from 4 ... ,MSS,JIS,DIN.Material:ASTM A106/A53 GRB/API 5L/ API 5CT/Q345/A335/ST37/ST52/X 40-X65 ... MSS,JIS,DIN.Material:ASTM A106/A53 GRB/API 5L/ API 5CT/Q345/A335/ST37/ST52/X 40-X65 ...