Dimensions, shape, weight and allowable deviation of hot-rolled equilateral angle steel (abstract) GB 9787-88

Abstract

This article is to discuss the size, shape, weight and allowed tolerance of GB 9787-88 hot rolled equal-angle steel.

GB 9787-88 hot rolled equal-angle steel is made from carbon structural steel. It is widely used in construction engineering and mechanical components. The sizes, shapes, weights and allowed tolerances of GB 9787-88 are stated in this article. In this article we also discuss how to measure the steel elements, such as length, angle, straightness and edges.

Size is the important parameter of GB 9787-88 hot rolled equal-angle steel. According to GB 9787-88, the steel size range is 20mm to 250mm, both the length side and thickness side should be within this range. The minimum double bended angle is not less than 135° and the two legs of one angle steel should be equal size.

The allowed tolerance of GB 9787-88 hot rolled equal-angle steel includes weight, thickness, length, angle and straightness. The tolerance of specific element should not exceed the limit of the GB 9787-88. For instance, the minimum thickness tolerance should not exceeded 0.5mm, the maximum total length tolerance should not exceed 6mm, the minimum double-bended angle is not less than 135°, the maximum allowable total length of the two legs of an equal-angle steel is not more than 0.5mm.

In addition, there are some requirement for the edges of GB 9787-88 hot rolled equal-angle steel. Generally, the edges should be neat no burrs. Quality controlling personnel should check the edges carefully, if necessary, they should grind or trim.

In conclusion, GB 9787-88 hot rolled equal-angle steel has great strength and flexibility, it has excellent performance in mechanical components or building engineering construction. The size, shape, weight and allowed tolerance should be controlled strictly in the production process, the edges should be neat without burrs. Thus the quality of GB 9787-88 hot rolled equal-angle steel can be guaranteed.

GB 9787–88 of Hot Rolled Equal-Sided Angle Steels defines the dimensions, shape, weight and allowable deviation for equal-sided angle steels rolled by hot rolling. This standard covers equal-sided angle steels GB9787-88, whose diameters are from 18 to 250mm and thickness is from 3 to 24mm.

Dimensions: Dimensions are expressed in millimeters, including between sides width, outer leg length and the wall thickness.

Shape and Weight: The shape and weight of the hot-rolled equal-sided angle steels are required to meet the following requirements:Tapered legs should form an angle of not more than 2 degrees with the horizontal opening. The distancing between two adjacent legs must be uniform, neither too big nor too small.The weight of these steels should be determined according to nominal size.

Allowable Deviation: The allowable deviation should meet the following requirements: deviations of the thickness must be +0.7mm or -0.4mm; the outer leg length should be +10mm or -2mm; the between sides width should not be higher than 0.8 times of the tolerance interval.

In short, GB 9787-88 of Hot Rolled Equal-Sided Angle Steels specifies the dimensions, shape, weight and allowable deviation for equal-sided angle steels rolled by hot rolling. Strictly regulate the size, shape and weight of hot-rolled equal-sided angle steels according to this standard, which is beneficial to normalize production of quality steel products.