... I-BEAMQ195,Q215,Q235,Q345“100X68-550X170’JIS I-BEAMSS330,SS400,SM490A,SM490B“100X75-600X190’1.Flat Steel BarCarbon Structural Steel,Alloy Structural Steel ,Spring Steel ... 2.Round Steel BarCarbon Structural Steel,Alloy Structural Steel,Spring Steel ...