... , air and railway6.Chemical composition7.SizeNamepipe line1.Applicantcarbon structural steel seamless steel pipeGradeL245,L360,A53,J55,N80 ,X42,X46,X52,X56 ... ,ASTM A179,ASTM A192,ASTM SA179,SA192,BS30595. ApplicantHigh pressure seamless steel tube for chemical Fertilizer EguipmentsGrade:10,20G,Q345,Q390 ... wall panel,economizer,reheater,superheater and steam pipeline of boilers. seamless pipe line