1.Classification

• Classification by production method
• Welded H - shaped steel: It combines three steel plates (two flange plates and one web plate) by welding. This production method has high flexibility and can customize H - shaped steel of different sizes and specifications according to specific engineering requirements. For example, welded H - shaped steel is more suitable for some small - scale building structures or projects with non - standard size requirements.
• Hot - rolled H - shaped steel: It is directly formed through a high - temperature rolling process. It has high - dimensional accuracy, high production efficiency, and stable mechanical properties. It is widely used in large - scale buildings, bridges and other projects with strict requirements for steel quality and specifications.
• Classification by flange width
• Wide - flange H - shaped steel (HW): Its flange width is relatively large, and the ratio of cross - sectional height to flange width is basically equal or small. This kind of H - shaped steel is more often used in compression members. For example, the columns in high - rise buildings use this type because it has a large moment of inertia of the cross - section and can bear a large axial pressure.
• Medium - flange H - shaped steel (HM): The flange width is between that of wide - flange and narrow - flange, and it is suitable for structural members that bear the combined action of bending moment and shear force. For example, the beams of some industrial factory buildings use this type.
• Narrow - flange H - shaped steel (HN): The flange width is relatively narrow and is more often used in flexural members. For example, the beams of light - weight buildings use this type, which can save materials while meeting the strength requirements.

    2.Characteristics

• Superior mechanical properties
• The cross - sectional shape of H - shaped steel is reasonable, so it performs well when bearing axial force, bending moment and shear force. Compared with ordinary I - shaped steel, the inner and outer sides of the flange of H - shaped steel are parallel, which is convenient for connection with other components. Moreover, under the same load - bearing condition, H - shaped steel can use thinner steel plates, thus saving the amount of steel used. For example, in a beam structure with the same span and load, the self - weight of an H - shaped steel beam may be lighter than that of an ordinary I - shaped steel beam.
• Convenient construction
• The specifications of H - shaped steel are relatively standard, and it is convenient for cutting, welding and installation at the construction site. It can be easily connected with other steel - structured components (such as angle steel, channel steel, etc.) to form various complex steel - structured systems. For example, when building the steel frame of an industrial factory building, H - shaped steel can be quickly spliced into a frame structure to improve construction efficiency.
• Economical and efficient
• Due to the good mechanical properties of H - shaped steel, the component size can be optimized in structural design to reduce the amount of steel used. Moreover, its processing cost is relatively low. Especially for hot - rolled H - shaped steel, the cost advantage is obvious in large - scale production. For example, in the construction of large - scale bridges, the use of H - shaped steel can reduce material cost and construction cost while ensuring structural safety.

   3.Application fields

• Construction field
• In high - rise buildings, H - shaped steel is often used for the production of columns and beams. Columns made of H - shaped steel can effectively bear the vertical load of buildings, and beams made of H - shaped steel can bear the bending moment and shear force transmitted from the floor. In the construction of industrial factory buildings, H - shaped steel is also the main structural material. Components such as steel roof trusses and crane girders can be made of H - shaped steel, which can provide sufficient strength and stiffness to meet the use requirements of factory buildings.
• Bridge engineering
• H - shaped steel can be used for the main girders, cross - beams and other structural parts of bridges. For example, in some medium - and small - span highway bridges, H - shaped steel girders can be used as the main load - bearing members. Their light weight and high strength can meet the bearing capacity and spanning requirements of bridges.
• Mechanical manufacturing
• In the frame structure of some large - scale mechanical equipment, H - shaped steel can provide stable support. For example, in the bridge structure of a crane, H - shaped steel can bear the self - weight of the crane and the weight of the lifted heavy objects, ensuring the safe operation of the crane.