Steel angle, it can be divided into two types: equal angle steel and unequal. And it has different surfaces, like Black and galvanized. For unequal angle steel can be divided into unequal edge equal thickness and unequal edge unequal thickness.The specification of the angle steel is expressed in terms of the length of the side and the thickness of the side. At present, the domestic angle steel specification is 2 - 20, with the centimeter number of the side length as the number. The same horn steel has 2 - 7 different side thickness. Angle steel can be made up of different force component s according to the different needs of the structure, and can also be used as connecting part s between components. It is widely used in various architectural and engineering structures, such as housing, bridges, transmission towers, lifting transport machinery, ships, industrial furnaces, reaction towers, container shelves, and warehouse shelves.