... 3)Length:R1,R2,R3 4)Standard:ASTM/DIN/API... oil casing steel pipe 1)OD:6-1200mm 2 ... R1,R2,R3 4)Standard:ASTM/DIN/API...Special Pipe: API Pipewe export API 5L oil pipes to Europe, North America ... STPA26,13CrMo44,10CrMo910,12CrMo195 and so on.Technical Standard:API 5LB,ASTM A 106 GR.B,ASTM A53 GR ... GB/t8163-1999,structural pipe GBT8162-1999 and hydraulic support pipe GB/T17396-1998 API 5CTcasing steel pipe