It is mainly divided into two types: equal-sided angle steel and unequal-sided angle steel. Among them, the unequal-sided angle steel can be divided into two types: unequal-sided and equal-thickness and unequal-sided and unequal-thickness.

The specification of angle steel is expressed by the dimensions of side length and side thickness. At present, the specifications of angle steel in China are 2-20, and the number of centimeters of the side length is the number. The same angle steel often has 2-7 different side thicknesses. The import and export angle steel is marked with the actual size and edge thickness of both sides and the relevant standards. Generally, large angle steels with a side length of 12.5cm or more are medium-sized angle steels with a side length of 12.5cm-5cm, and small-sized angle steels with a side length of less than 5cm.

The order of import and export angle steel is generally based on the specifications required in use, and its steel grade is the corresponding carbon steel grade. In addition to the specification number, angle steel has no specific composition and performance series. The delivery length of angle steel is divided into fixed length and double length. The selection range of fixed length of domestic angle steel is 3-9m, 4-12m, 4-19m, 6-19m according to the different specifications. The length of angle steel produced in Japan ranges from 6 to 15m.

The section height of the unequal angle steel is calculated according to the long side width of the unequal angle steel. Refers to steel with an angular section and unequal lengths on both sides. It is a kind of angle steel. Its side length is 25mm×16mm～200mm×125mm. Rolled by hot rolling mill. The general unequal angle steel specifications are: ∠50*32--∠200*125, the thickness is 4-18mm.

Unequal angle steel is widely used in various metal structures, bridges, machinery manufacturing and shipbuilding, various building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, Container racks and warehouses and more!