Width of H-shaped steel

The flange of H-shaped steel is parallel or nearly parallel on the inside and outside, and the end of the flange is at a right Angle, so the limitation of the I-steel is named parallel flange I-steel. The thickness of the web of H-shaped steel is smaller than that of ordinary I-beams with the same height of the web, and the width of the flange of the I-beams is larger than that of ordinary I-beams with the same height of the web, so it is also named wide-rim I-beams. Determined by the shape, the section modulus, moment of inertia and corresponding strength of H-beam steel - European standard H-beam steel - channel steel  H-beam steel are significantly better than the same single weight ordinary I-beam steel.

Used in metal structures with different requirements, the limitations of I-steel whether it is subjected to bending moment, the edge of the I-steel is at a right Angle, and the eccentric load of the I-steel shows its superior performance, which can greatly improve the carrying capacity and save 10% to 40% of metal compared with ordinary I-steel. H-shaped steel has wide flange, thin web, many specifications, flexible use, and can save 15% to 20% of metal in various truss structures. Because its flange is parallel inside and outside, and the edge end is at a right Angle, it is easy to assemble and combine into various components, which can save welding and riveting workload about 25%, which can greatly speed up the construction speed of the project and shorten the construction period.

H-shaped steel can be produced by welding or rolling. Welding H-shaped steel is to cut the appropriate thickness of the strip to the appropriate width, and weld the flange and web together in the continuous welding set. Welding H-beam steel has the disadvantages of large metal consumption, it is not easy to ensure uniform product performance after plating of I-beam steel, and the dimension of Angle steel is limited. Therefore, H-shaped steel is mainly produced by rolling method. In modern steel rolling production, H-shaped steel - I-beam steel - European standard H-shaped steel - channel steel - Angle steel  uses universal rolling mill to roll H-shaped steel.

The web plate of H-shaped steel is rolled between the upper and lower horizontal rolls, and the flange is simultaneously rolled between the side of the horizontal roll and the vertical roll. Since the edge of the flange cannot be pressed by the universal rolling mill alone, the edge rolling machine needs to be set up behind the universal frame for the post-plating treatment of the I-steel, and the wear of the Angle steel roll is relatively large. In order to ensure that the roll can be restored to its original shape after heavy rolling, Angle steel is used to press down the flange end and control the width of the flange. In the actual rolling operation, the two frames are taken as a group, so that the rolled piece passes through a number of times, or the rolled piece passes through a continuous rolling set composed of several universal stands and one or two rolling edge end stands, and a certain amount of pressure is applied each pass to roll the blank into the desired specification shape and size of the product.

At the flange of the rolled piece, the wear of the roll is relatively large because of the sliding between the horizontal roll side and the rolled piece. In order to ensure that the roll can restore the original shape after heavy rolling, the side of the horizontal roll and the corresponding vertical roll surface of the roughing mill should be 3° ~ 8°. In order to correct the inclination of the finished flange, the finished universal rolling mill, also known as the universal finishing mill, is set up. The horizontal roll side is perpendicular to the horizontal roll line or has a small inclination Angle, generally not greater than 20 ', and the vertical roll is cylindrical.