Material:Q235B,SS400,Q345 I beam can be used in a variety of building structures,the bridge,the support and so on I steelFirstly, I Beam is also named as Steel Girder, which is represented in millimeter, high, leg extends , waist thick. Secondly, I Beam is widely used in each kind of building structures, bridges, vehicles, supports, machineries and so on. Dalian Shengang International Trade Co,. ...