Angular iron is a long strip of steel with the two sides perpendicular to each other. There are differences between equal Angle Steel and unequal angle steel. The two sides of the equal angle steel have equal widths. Its specification is expressed in millimeters of edge width x edge width x edge thickness. For example, "∟30×30×3", it means an equilateral angle steel with a side width of 30 mm and a side thickness of 3 mm. It can also be expressed by the model, which is the number of centimeters of the edge width, such as ∟3#. The model does not represent the size of different side thicknesses in the same model, so the edge width and side thickness dimensions of the angle steel are fully filled in on the contract documents to avoid using the model separately. The specifications of hot-rolled equilateral angle steel are 2#-20#. Angle steel can form various stress-bearing members according to different structure needs, or can be used as a connecting member between the components. It is widely used in 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. [1] Type specifications and reporting are mainly divided into two categories: equal angle steel and unequal angle steel. Among them, unequal angle steel can be divided into two types: unequal edge thickness and unequal edge thickness. The specifications of angle steel are expressed by the dimensions of side length and side thickness. The specifications of domestic angle steel are 2-20, with centimeters of side length as the number. The same angle steel often has 2-7 different side thicknesses. Imported angle steel indicates the actual size and thickness of both sides and indicate the relevant standards. Generally, large angle steel with side lengths above 12.5cm is large angle steel, medium angle steel with side lengths below 5cm is small angle steel. The order of imported and export angle steel is generally based on the specifications required during use, and its steel number is the corresponding carbon junction steel number. In addition to specifications, angle steel has no specific composition and performance series. The delivery length of angle steel is divided into two types: fixed ruler and double ruler. The selection range of domestic angle steel is 3~9m, 4~12m, 4~19m, and 6-19m according to the specifications. The length selection range of angle steel produced in Japan is 6~15m. The cross-sectional height of unequal angle steel is calculated based on the length and width of unequal angle steel. Refers to steel with an angled cross section and unequal lengths on both sides. It is one of angle steel. The side length is from 25mm×16mm~200mm×125mm. Rolled from a hot rolling mill. The general specifications of unequal angle steel are: ∟50*32~∟200*125, and the thickness is 4-18mm. [2] Application report editing angle steel can form various stress-bearing components according to different structures, or can be used as a connecting member between components. It is widely used in various building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks, cable trench brackets, power pipes, busbar bracket installations, and warehouse racks. Angle steel is a carbon structural steel for construction. It is a simple section steel steel, mainly used for metal components and factory frames. In use, the raw steel billets that produce angle steel are required to have good weldability, plastic deformation properties and certain mechanical strength. The raw steel billets for producing angle steel are low-carbon square billets, and the finished angle steel is delivered in hot-rolled, normalized or hot-rolled states.