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H-beam is a type of steel manufactured through hot rolling, with an H-shaped cross-section that offers high strength and rigidity. It is widely used in construction, bridges, and engineering machinery. Standards are set by the National Standardization Committee to ensure consistency in production and usage. Specification standards cover dimensions, weight, mechanical properties, and chemical composition of H-beams.

The specification standards for H-beams typically include external dimensions, weight, and related performance indicators. External dimensions encompass 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 specification standards for H-beams also include requirements for mechanical properties and chemical composition, such as tensile strength, yield strength, and elongation.