... ,Eastern Asia,North America etc. 3.Standard: GB/AISI/ASTM/JIS/API pipe line1.Grade:L245,L360,A53,J55,N80 ,X42,X46 ... 4.Applicant Seamless steel pipe for low and Medium pressure BoilerGrade:10,20 StardandGB3087-2008,ASTM A179,ASTM A192,ASTM SA179,SA192,BS30595. ApplicantHigh ... . casing pipe serves as wall of well.3), ASTM A106 For the purpose of the pipeline project of boiler,water&petroleum.4), ASTM A53 ...