Cold rolled carbon steel round bar material: 45#,Q235,ST37,SS400,Q345. cold rolled steel round bar:material: 45#,Q235,ST37,SS400,Q345.Standards: GB/T 912, GB/T ... 17100, A36, A568, A570, A572Other steel grade can be provided after negotiating with customers. Finish: brightPacking:International seaworthy packing. Cold rolled steel round bar