1.pipe line 2.Mainly export to Southeast Asia,Africa,Mid East ... 12Cr2MoStardandISO 9329-2-1997,ASTM A161-946. ApplicantSeamless steel pipe for Petroleum CrackingGrade:10,20,12CrMo,15CrMo,1Cr2Mo,1Cr5MoStardandGB9948- ... 5CT Tubing is used in extracting petroleum & natural gas. casing pipe serves as wall of well.3), ASTM A106 For the ... ,reheater,superheater and steam pipeline of boilers. seamless pipe line