ASTM A36 A992 Hot Rolled Welding Universal Beam Q235B Q345E Structure Steel H I Beam

H-beam can be produced by welding or rolling. Welded H-beam is to cut the strip steel of appropriate thickness into appropriate width, and weld the flange and web together on a continuous welding unit. Welded H-beam has the disadvantages of high metal consumption, difficulty in ensuring uniform product performance, and limited size specifications. Therefore, H-beam is mainly produced by rolling.

In modern steel rolling production, universal rolling mills are used to roll H-beam. The web of H-beam is rolled between the upper and lower horizontal rollers, and the flange is rolled and formed simultaneously between the side of the horizontal roller and the vertical roller. Since the flange end cannot be pressed down by the universal rolling mill alone, it is necessary to set an edge rolling machine, commonly known as an edge rolling machine, behind the universal frame to press down the flange end and control the flange width. In actual rolling operation, these two stands are used as a group to make the rolled piece reciprocate several times (Figure 2a), or the rolled piece is passed through a continuous rolling mill consisting of several universal stands and one or two edge rolling stands, and a certain amount of reduction is applied each time to roll the billet into a product of the required specifications, shape and size. In the flange part of the rolled piece, the wear of the roll is relatively large due to the sliding between the side of the horizontal roller and the rolled piece. In order to ensure that the roll can restore its original shape after heavy rolling, the side of the upper and lower horizontal rolls of the rough rolling unit and the corresponding vertical roll surface should be inclined at an angle of 3° to 8°.