Flat steel refers to steel 12-300 mm wide and 3-60 mm thick with rectangular section and slightly blunt edge. Flat steel can be finished steel, also can be used as welded pipe blank and thin slab for laminated sheet. The thickness is 8 ~ 50mm, the width is 150-625mm, the length is 5-15m, and the product specification span is dense, which can meet the needs of users. Instead of the medium plate, it can be directly welded without cutting.