Angle steel, also known as angle iron, is a long strip of steel that is perpendicular to each other and forms an angle. There are equilateral angle steel and unequal angle steel. Among them, unequal angle steel can be divided into two types: unequal sides and equal thickness and unequal sides and unequal thickness.

Angle steel can be composed of various stress components according to different needs of the structure, and can also be used as a connector between components. 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.

Angle steel inspection method:
① Tensile test method. Commonly used standard inspection methods include GB/T228-87, JISZ2201, JISZ2241, ASTMA370, ГОСТ1497, BS18, DIN50145, etc.;
② Bending test method. Commonly used standard inspection methods include GB/T232-88, JISZ2204, JISZ2248, ASTME290, ГОСТ14019, DIN50111, etc.
(2) Performance indicators: The inspection items for evaluating the performance of angle steel are mainly tensile test and bending test. Indexes include yield point, tensile strength, elongation and bending.