... 10mm, Length:0-12000mm \ Diameter: 20-620mm Standard: GB/AISI/ASTM API 5Lseamless steel round pipe1.Grade: ASTMA106,10#,20#,Q235B,Q195 ... sea, air and railway6.Chemical composition7.SizeNameseamless steel pipe1.Applicantcarbon structural steel seamless steel pipeGrade10,20,35,45,40Mn2,45Mn2,27SiMn,20Cr ... ,economizer,reheater,superheater and steam pipeline of boilers. API 5L seamless steel round pipe