With the continuous development of industry, the demand for steel has been continuously increasing, and the use of channel steel in large buildings is the most extensive. The import volume of China's channel steel is much larger than the export volume. With the introduction of major equipment, the import volume of large channel steel is also increasing. The allowable deviation of the surface quality and geometry of channel steel has specific provisions. Next, Xiaobian introduced the theoretical scale of channel steel .
The specifications of channel steel are mainly expressed in terms of height (h ), leg width (b ), and waist thickness (d ). At present, domestic channel steel specifications range from 5 to 40, which corresponds to a height of 5 to 40 cm. In the case of the same height, the light channel steel is lighter than the common channel steel, the legs are narrow, and the waist is thin. Channel No. 5 to No. 16 is medium channel steel and No. 18 to 40 are large channel steel. The imported channel steel will clearly indicate the actual size and related standards. The import and export orders for channel steels are based on the specifications required in use after the corresponding carbon steel (or low alloy steel) steel grades are determined. In addition to the specification number, channel steel does not have a specific composition and performance series.
Due to the complexity of the manufacturing process of the channel steel, the allowable deviation range of the channel steel is: Models 5, 6.3, 6.5, 8, 10, 12, 12.6, 14, 16, 18. Height (h) ± 1.5, ± 2.0, ± 2.0, ± 3.0, ± 3.0. Leg width (b) ± 1.5, ± 2.0, ± 2.5, ± 3.0, ± 3.5. Waist thickness (d) ± 0.4, ± 0.5, ± 0.6, ± 0.7, ± 0.8. Bend deflection should not exceed 0.15d. The usual length is: 5-12m, 5-19m, 6-19m.
The allowable deviation of the surface quality and geometry of the channel steel is specified in the standard. It is required that the surface of the channel steel must be free of harmful defects and must not be significantly twisted. The permissible value of the wave bending of the channel steel and the relevant parameters (h, b, d, t, etc.) of the steel surface shape of each channel must be specified. Difference. If the channel geometry is incorrect, the main performance is: angle, leg expansion and legs and so on. The theoretical weight of channel steel units: kg/m, mm. Channel steel theoretical weight table specifications such as 5 # 50 * 37 * 4.5 * 6.928 * 5.438, said the specification is 5 #, waist height is 50mm, leg height is 37mm, waist thickness is 4.5mm, cross-sectional area of ​​6.928cm, weight It is 5.438.
Channel theory weight table
Editor's summary: This is the introduction to the theory of channel gauges. For more information, you can follow this site information.
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