Angle steel, commonly known as angle iron, is a long strip of steel that is perpendicular to each other on both sides. There are equilateral angle steel and unequal angle steel. The two sides of an equilateral angle are equal in width. Its specifications are expressed in mm of side width × side width × side thickness. For example, “∟30 × 30 × 3” means an equilateral angle steel with a side width of 30 mm and a side thickness of 3 mm. Can also be expressed by model.

The model is the number of centimeters in width, such as ∟3 #. The model does not indicate the size of different side thicknesses in the same model. Therefore, fill in the side width and side thickness of the angle steel on the contract and other documents, so as to avoid expressing it by the model. The specification of hot rolled equilateral angle steel is 2 # -20 #. Angle steel can be composed of various stress-bearing components according to the different needs of the structure, and can also be used as a connecting piece between the components. Widely used in various building structures and engineering structures, such as house beams, bridges, power transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks and warehouses.