carbon structural steel round bar high quality 1.10#,20#,25#,30#,35#,40#, ... #,50#, 2.Q195-Q275,40Cr,20-42CrMo,20-30CrMnTi carbon structural steel round bar high quality1.10#,20#,25#,30#,35#,40#,45 ... are manufactured by Laiwu Steel Group.Mrs,LiTelephone:86-0634-6461612,13054836377Mobile Phone: 13963400909Fax: 86-0634-6461613 carbon structural steel round bar high quality