Flat steel refers to steel with a width of 12-300mm, thickness of 3-60mm, and a rectangular cross-section with slightly dull edges. Flat steel can be finished steel or used as billets for welding pipes and as thin plate billets for tandem rolling. Main applications: As finished steel, flat steel can be used to make tie rods, tools, and mechanical components; in construction, it serves as structural components for building frames and staircases.