Flat steel refers to steel with a width of 12-300mm, a thickness of 3-60mm, a rectangular cross-section with slightly rounded edges. According to the production process, it can be divided into hot-rolled flat steel and cold-rolled flat steel; according to the material, it can be classified as Q235B flat steel, 304 stainless steel flat steel, galvanized flat steel, high-strength alloy flat steel, etc.