Profiles are objects with a certain geometric shape made of iron or steel and materials with certain strength and toughness through rolling, extrusion, casting and other processes. This kind of material has a certain appearance size, a certain shape of the section, and has certain mechanical and physical properties. Profiles can be used alone or further processed into other manufactured products, often used in building structures and manufacturing installations. The mechanical engineer can select the specific shape, material, heat treatment state, mechanical properties and other parameters of the profile according to the design requirements, and then divide the profile according to the specific size and shape requirements, and then further process or heat treatment to meet the design accuracy requirements. The material, specifications and dimensions of the profiles can refer to the corresponding national standards.