Mainly divided into two categories, equilateral Angle steel and unequal Angle, which can be divided into the unequal unequal Angle of two kinds of thickness and unequal different thickness.

The specifications of the Angle steel in length and the size of the edge thickness. At present domestic Angle specifications for 2, 20, is number with number of cm side length, the same number Angle always have 2, 7 kinds of different edge thickness. Import Angle indicating the actual size and edge on both sides of the thick and indicate the relevant standards. General side length 12.5 cm above for large Angle steel, 12.5 cm, 5 cm as the medium between the Angle steel, less than 5 cm length for small Angle.

Import and export of Angle in order to use commonly required specification is given priority to, its steel grade for carbon steel and steel grade. And Angle in addition to gauge number, no specific composition and performance of the series. Angle steel length is divided into the length of delivery, two times ruler, domestic Angle scale range according to different size specifications have 3-9 m, 4 m, 4-12-19 m, 6 - m four range. The length of the Japanese Angle range for 6 to 15 m.

Unequal Angle section height calculated by unequal Angle of long and wide. Refer to section for Angle and long on both sides do not equal steel. Is one of the Angle. The side length of 25 mm x 16 mm ~ 200 mm x l25mm. Made from a hot rolling mill. Generally not equal Angle steel specifications for: 32 - < < 50 * 200 * 125 for 4 to 18 mm thickness

Unequal Angle is widely applied in all kinds of metal structures, Bridges, machinery manufacturing and shipbuilding industry, all kinds of building structure and engineering structure, such as the beam, Bridges, transmission tower, lifting transportation machinery, ship, industrial furnace, reaction tower, container frame and warehouse, etc