China galvanized steel profiles is a bar-shaped steel with a certain cross-sectional shape and size, and is one of the four major varieties of steel (plate, tube, profile, wire). According to the section shape, the section steel is divided into simple section section steel and complex section section steel (special section steel). The former refers to square steel, round steel, flat steel, angle steel, hexagonal steel, etc.; the latter refers to I-beam, channel steel, rail, window frame steel, curved steel, etc.

According to the different smelting quality of steel, section steel is divided into ordinary section steel and high-quality section steel. Ordinary section steel is divided into large section steel, medium section steel and small section steel according to the current metal product catalog. Ordinary steel can be divided into I-beam, channel steel, angle steel, round steel and so on according to its cross-sectional shape.

Large section steel: I-beam, channel steel, angle steel, and flat steel in large section steel are all hot-rolled. In addition to hot-rolling, round steel, square steel, and hexagonal steel are also forged and cold-drawn.

I-beam, channel, angle steel are widely used in industrial buildings and metal structures, such as workshops, bridges, ships, agricultural machinery and vehicle manufacturing, transmission towers, and transportation machinery, often used in conjunction. Flat steel is used in construction sites as bridges, house frames, fences, power transmission ships, vehicles, etc. Round steel and square steel are used for various mechanical parts, agricultural machinery accessories, tools, etc.

Medium section steel: Medium section steel medium, groove, corner, round, flat steel, the use is similar to large section steel.

Small section steel: Small section steel is medium angle, round, square and flat steel. The processing and use are similar to those of large section steel. Small diameter round steel is often used as construction steel bar.

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

The inner and outer sides of the flange of the 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 10% to 40% of metal. H-beams have wide flanges, thin webs, many specifications and flexible use, and can save 15% to 20% of metal when used in various truss structures. Because the inner and outer sides of the flanges are parallel, 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.There are many product specifications of H-beam, and the classification methods are as follows. (1) According to the flange width of the product, it is divided into wide flange, middle flange and narrow flange H-beam. The flange width B of wide flange and middle flange H-section steel is greater than or equal to the web height H. The flange width B of the narrow flange H-beam is approximately equal to one-half of the web height H. (2) According to product use, it is divided into H-shaped steel beam, H-shaped steel column, H-shaped steel pile, and extremely thick flange H-shaped steel beam. Sometimes parallel leg channels and parallel flange T-beams are also included in the scope of H-beams. Generally, the narrow flange H-beam is used as the beam material, and the wide-flange H-beam is used as the column material. (3) According to the production method, it is divided into welded H-beam and rolled H-beam. (4) According to the size, it is divided into large, medium and small H-beams. Usually, products with a web height H above 700mm are called large, those with a height of 300 to 700mm are called medium, and those with a height of less than 300mm are called small. By the end of 1990, the world's largest H-beam had a web height of 1200mm and a flange width of 530mm.

Internationally, H-beam product standards are divided into two categories: the imperial system and the metric system. The United States, the United Kingdom and other countries use the imperial system, and China, Japan, Germany, and Russia use the metric system. Although the measurement units used in the imperial and metric systems are different, most of the H-beams use four dimensions to express their specifications, namely: the height of the web h, flange width b, web thickness d and flange thickness t. Although countries around the world express different H-beam size specifications. However, the size range and size tolerance of the products produced are not much different.

h channel steel is economical and reasonable, and the mechanical properties are good. During rolling, the extension of each point on the section is relatively uniform and the internal stress is small. Compared with ordinary I-beam, it has a large section modulus and a heavy weight.

The advantages of light weight and metal saving can reduce the building structure by 30-40%; because the inner and outer sides of the legs are parallel, and the legs are at right angles, they can be assembled into components, which can save welding and riveting.

The workload is up to 25%. It is often used in large buildings (such as workshops, high-rise buildings, etc.) that require large bearing capacity and good section stability, as well as bridges, ships, and cranes.

Machinery, equipment foundations, supports, foundation piles, etc.