... ,North America etc. 3.Standard: GB/AISI/ASTM/JIS/API pipe line1.Grade:L245,L360,A53,J55,N80 ,X42,X46,X52 ... ,12Cr2MoStardandISO 9329-2-1997,ASTM A161-946. ApplicantSeamless steel pipe for Petroleum CrackingGrade:10,20,12CrMo,15CrMo,1Cr2Mo,1Cr5MoStardandGB9948-2006 ... JIS G3441-19887. ApplicantSeamless steel pipe for Gas CylindersGrade:34Mn2V,30CrMo,35CrMo,45.8.Application1),API SPCE 5L For the purpose ...