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H-beam is an economical type of steel with an H-shaped cross-section, named for its resemblance to the English letter 'H'. It boasts high strength and rigidity, making it widely used in construction, bridges, and machinery manufacturing. The model of H-beam consists of two parts; for example, the model HM250×175×7×11 indicates that HM stands for H-beam, 250 represents the height of the H-beam, 175 represents the width of the H-beam, and 7 and 11 represent the thickness of the web and flange, respectively.

The specifications of H-beams typically include external dimensions, weight, and relevant performance indicators. External dimensions cover parameters such as flange thickness, web thickness, flange width, and web width. The weight calculation formula is: weight (kg/m) = 0.00785 × flange width × flange thickness + 0.00785 × web width × web thickness. In addition to dimensions and weight, the specifications of H-beams also include requirements for mechanical properties and chemical composition, such as tensile strength, yield strength, and elongation.