I-beam purchase tips

For Xiaobai who is in contact with steel for the first time, I-beam is similar to H-channel steel. I don't know how to identify it and how to choose it in specific applications? Many people who have been in the construction industry for many years cannot elaborate. The following small series through years of experience for you to talk about in detail:

The I-beam section has good straight working pressure and tensile resistance, but the section specification is too narrow to resist torsion. In contrast to H steel, both are good and bad.

1. Whether the I-beam is general-purpose or light, due to the relatively high and narrow cross-section specifications, the moment of inertia of the two main sleeves in the cross-section is relatively large, so it can only be used immediately for prefabricated components bent in the beam end plan view. Or form a form-supported prefabricated member. Pivot-stressed prefabricated members and prefabricated members bent in the vertical bisector beam end plan are not suitable for selection, so they have great limitations in the scope of application.

2. H channel steel is an aluminum profile with high efficiency and economic development (also cold drawn thick wall channel steel, profiled plate, etc.). ), because the cross section is effective, the efficiency of the stainless steel plate can be fully exerted and the cutting capacity can be improved. Different from ordinary I-beams, the flanges of H-channel steel are enlarged, and the inner and outer surfaces are generally parallel, which is conducive to the connection of high-strength bolts and other prefabricated components. Its specifications constitute an effective series of products, with complete models and specifications, which are conducive to the adoption of design schemes.

3. The flanges of H channel steel are of equal thickness, with cold-rolled section, and are also welded by three plates. I-beams are all cold-rolled sections. Due to the poor production process, there is a 1:10 inclination on the inside of the flange. The cold rolling of H-channel steel is different from ordinary I-beams, and only one set of horizontal rolls is used. Due to the wide flange and no inclination (or small inclination), it is necessary to add a set of stud rolls for rolling. Therefore, its cold rolling process and mechanical equipment are more complicated than ordinary extruders. The large cold-rolled h-channels that can be produced in China have an aspect ratio of 800 mm, which exceeds the cross-section that can only be formed by electric welding.

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