... 1998 DIN 1629-1984 3.Applicant seamless steel tube for high pressure boilers Grade:20G,20MnG,25MnG,15MoG,20MoG,12Cr1MoVG,15CrMoVG ... Part 2:1990 4.Applicant Seamless steel pipe for low and Medium pressure BoilerGrade:10,20 StardandGB3087-2008,ASTM A179, ... ASTM A192,ASTM SA179,SA192,BS30595. ApplicantHigh pressure seamless steel tube for chemical Fertilizer EguipmentsGrade:10,20G,Q345,Q390,10MoVNb ...