1. Angle iron, commonly known as angle steel, is a long strip of steel that forms a right angle at each end. It comes in two types: equal leg angle and unequal leg angle. Depending on the structural requirements, angle iron can be assembled into various load-bearing components and also serves as a connecting element between components. It is widely used in various architectural and engineering structures, such as beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container frames, and warehouses.

2. Channel steel is a long strip steel with a concave cross-section, classified as carbon structural steel for construction and machinery use. It is a type of steel with a complex cross-section, featuring a concave shape. Channel steel is primarily used in building structures, curtain wall projects, machinery and equipment manufacturing, and vehicle production.