The main function of I-beams is load-bearing. Currently, I-beams are widely used in engineering construction, such as building construction, bridge construction, automobile manufacturing, bracket fixation, and other industries. I-beams can also be seen in various engineering construction brackets.

Hole system of I-beam:

1. Direct rolling pass system: The direct rolling pass system refers to a pass system in which the two open legs of the I-beam pass are located on the same side of the roll axis, and the waist is parallel to the roll axis. Its advantages are that the axial force of the roll is small, the axial movement is small, there is no need for a working slope, the pass occupies a small length of the roll body, and multiple pass types can be configured under the condition of a certain roll body length;

2. Diagonal rolling pass system: This pass system refers to the two open legs of the I-beam pass not being located on the same side of the waist at the same time, with an angle between the waist and the horizontal axis;

3. Mixed pass system: Based on the characteristics of the rolling mill and product, in order to fully utilize the advantages of each system and overcome the disadvantages, a mixed pass system is often used, which is a combination of two or more systems. If the finished hole and the front hole of the finished product adopt a straight leg oblique rolling hole system, and other hole types adopt a bent leg oblique rolling system; Alternatively, the rough rolling holes can be processed using a straight rolling system, while the last 3-4 precision rolling holes can be processed using straight leg oblique piercing holes.

I-beam is an economical section steel with superior mechanical properties, characterized by the following features:

1. Wide wing edge and high lateral stiffness. Strong bending resistance;

2. The two surfaces of the wing edge are parallel to each other, making connection, processing, and installation easy;

3. Compared with general steel, it has low cost, high precision, low residual stress, and does not require expensive welding materials and weld seam testing, saving steel structure production costs;

4. Under the same cross-sectional load. Hot rolled H-beam structure reduces weight compared to traditional structures;

5. Compared with concrete structures, I-beam structures can increase the usable area, reduce the self weight of the structure, and decrease the internal forces in structural design;

6. I-beams can be processed into T-shaped steel, and honeycomb beams can be combined to form various cross-sectional forms to meet engineering design and manufacturing requirements.

Specification and model of I-beam:

Its specifications are expressed as height x leg thickness x waist thickness, and the main dimensions of the specifications can also be represented by a number. For example, I-beam 18 refers to an I-beam with a height of 18 cm. If the height of the I-beams is the same, a corner code a, b, or c can be added after the number to indicate it, such as 36a, 36b, 36c, etc. It is divided into ordinary I-beams, lightweight I-beams, and wide flange I-beams. According to the ratio of flange to web height, it is divided into wide, medium, and narrow flange I-beams. The specifications produced by the first two are 10-60, with corresponding heights ranging from 10 cm to 60 cm.

Design of I-beam dimensions:

1. H-beams belong to economical cutting profiles (other types include cold-formed thin-walled steel, pressed steel plates, etc.). Due to their reasonable cross-sectional shape, they can make the steel more efficient and improve its cutting capacity. Unlike ordinary I-beams, H-beams have widened flanges and their inner and outer surfaces are usually parallel, which makes it easy to connect high-strength screws and other components. Their size composition is reasonable, with a complete range of models, making them easy to design and select;

2. The selection of I-beams in structural design should be based on their mechanical properties, chemical properties, weldability, structural dimensions, and other factors.

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