Billet refers to semi-finished products used to produce steel, which cannot be directly used by society. Billet and steel are strictly divided according to the standard, which cannot be determined by whether it is the final product of the enterprise, but should be implemented according to the unified standard of the whole society.

Billet is the product of molten steel made by steelmaking furnace after casting. The steel billets can be mainly divided into two types from the manufacturing process: mold casting billets and continuous casting billets. The mold casting process has been basically eliminated. Billets are originally steel. After processing, they can be used as machine parts, forgings, and various steels. Q345B channel steel is a section steel, and wire rod is the role of billets.