... , air and railway6.Chemical composition7.SizeNameseamless steel pipe1.Applicantcarbon structural steel seamless steel pipeGrade10,20,35,45,40Mn2,45Mn2,27SiMn ... ASTN A519-98, JIS G3441-1994 2.Applicant Seamless steel tubes for liquid serviceGrade 10,20,Q295,Q345 Stardand GB ... 12Cr2MoStardandISO 9329-2-1997,ASTM A161-946. ApplicantSeamless steel pipe for Petroleum CrackingGrade:10,20,12CrMo,15CrMo,1Cr2Mo ...