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.