... G3454-1998 DIN 1629-1984 3.Applicant seamless steel tube for high pressure boilers Grade:20G,20MnG,25MnG,15MoG, ... A192,ASTM SA179,SA192,BS30595. ApplicantHigh pressure seamless steel tube for chemical Fertilizer EguipmentsGrade:10,20G,Q345,Q390,10MoVNb,12CrMo ... and other common fluids.5), ASTM A179 For tubed heat exchanger and similar heat conveying equipments6), ASTM A192 For manufacture wall panel, ...