... mm 3Grade:J55,K55,N80,L80 4Standard:API 5CT 5Thread:BTC,STC,LTC Oil casing pipeHuadong Industrial ... .Standard:ASME B36.10M-1996,API,ANSI,GB,MSS,JIS,DIN.Material:ASTM A106/A53 GRB/API 5L/ API 5CT ... passed ISO 9001:2000 quality system certification and API certification of American Petrol Institute. products have ... Standard:ASME B36.10M-1996,API,ANSI,GB,MSS,JIS,DIN.Material:ASTM A106/A53 GRB/API 5L/ API 5CT ...