According to the section steel standard stipulated in the Chinese standard GB/T 706-2016, the size of the I-beam is mainly expressed by the height (h), the width of the waist plate (b), the thickness of the waist plate (d1) and the thickness ratio (t) of the thickness of the waist plate. Various models and specifications of I-beams are defined in the standard, for example, 20a, 25b, 30c and other different models are common. The weight of an I-beam can be calculated from its dimensions. In general, weight can be expressed in terms of weight per unit length, such as kilograms per meter (kg/m) or tons per meter (t/m). The allowable deviation of I-beam refers to the allowable error range between its size and weight and the standard specified value during the manufacturing process, usually involving deviations in height, waist plate width, waist plate thickness, thickness ratio of waist plate thickness limit etc.

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