In the field of engineering materials, relative to the equilateral Angle steel with two sides of equal length, it refers to the Angle steel with right-angle l-shaped section and unequal length on both sides.

It is widely used in all kinds of municipal public, civil construction and military industrial structure and engineering structure, such as industrial beam, bridge, transmission tower, lifting transport machinery, ships, industrial furnace, reaction tower, container frame, and warehouse, because its consumption is less than unilateral Angle steel, so the relative price is slightly higher.