Angle steel, also known as angle iron, is the two sides of the vertical into 90 degrees right angle of the steel bar, divided into equilateral angle steel and unequal angle steel; Angle steel is a simple cross-section section steel steel used in the construction of the building is a carbon structural steel; mainly used for metal components and plant frames, etc., so that the angle steel is required to have a better weldability, plastic deformability and to withstand a certain degree of mechanical strength.