... quality hot rolled carbon round steel(Q235 Q345 SS400 S235JR S275JR S355JR....manufacture,customize)specificationOuter Diameter ... :3.5mm-300mmStandardGB,JIS,DIN,AISI,ASTMCertificateISO9001-2008 Material10#,20#,45#,Q195,Q235B ,SS400 ... ,ASTM A36,S235JR,St37-2,Q345B,S355JR,etc.ApplicationA ...