Billets are primary products obtained by casting molten steel from steel-making furnaces, typically in the form of slabs (for producing plates), blooms (for structural and wire products), and tube rounds. They are important semi-finished products in the steel industry, exhibiting good plasticity and workability. Billets serve as raw materials for downstream processes and can be further processed through rolling, forging, drawing, and other techniques into finished steel products of various specifications and shapes, such as steel plates, steel tubes, and steel bars. Q235 steel is a commonly used carbon structural steel with good weldability, ductility, and cold-forming capability.