H-beam is an economical section and high-efficiency profile with more optimized cross-sectional area distribution and more reasonable strength-to-weight ratio. It is named because its cross section is the same as the English letter "H". Since all parts of H-beam are arranged at right angles, H-beam has the advantages of strong bending resistance in all directions, simple construction, cost saving and light weight in structure, and has been widely used.

The inner and outer sides of the flange of H-beam are parallel or nearly parallel, and the flange ends are at right angles, so it is named parallel flange I-beam. The thickness of the web of the H-beam is smaller than that of the common I-beam with the same height of the web, and the flange width is larger than that of the common I-beam with the same height of the web, so it is also named wide-edge I-beam. Determined by the shape, the section modulus, moment of inertia and corresponding strength of H-beam are obviously better than ordinary I-beam of the same single weight. Used in metal structures with different requirements, whether it is subjected to bending moment, pressure load, or eccentric load, it shows its superior performance. Compared with ordinary I-beam, it can greatly improve the bearing capacity and save metal by 10% to 40%. H-beams have wide flanges, thin webs, many specifications, and flexible use. They can save 15% to 20% of metal when used in various truss structures. Because the edges of its wings are parallel to the inside and outside, and the edge ends are at right angles, it is easy to assemble and combine into various components, thereby saving about 25% of the welding and riveting workload, which can greatly speed up the construction speed of the project and shorten the construction period.