... .pipe line 2.Thickness:1.53-40mm, Length:0-12000mm Diameter: 20-620mm 3.Standard: GB/AISI/ASTM/JIS pipe ... 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. ... and steam pipeline of boilers. seamless pipe line