... Asia,North America etc. 3.Standard: GB/AISI/ASTM/JIS pipe line1.Grade:L245,L360,A53,J55,N80 ,X42,X46,X52,X56 ... 1984 3.Applicant seamless steel tube for high pressure boilers Grade:20G,20MnG,25MnG,15MoG,20MoG,12Cr1MoVG,15CrMoVG,12Cr2MoG,12Cr2MoWVTiB, ... low and Medium pressure BoilerGrade:10,20 StardandGB3087-2008,ASTM A179,ASTM A192,ASTM SA179,SA192,BS30595. ApplicantHigh pressure seamless steel tube for ...