Flat steel refers to steel with a width of 12-300mm, a thickness of 3-60mm, a rectangular cross section and a slightly blunt edge. Flat steel can be finished steel, and can also be used as blank of welded pipe and thin plate blank for overlapping rolling. Main uses: flat steel can be used as a finished product to make hoop iron, tools and mechanical parts, and can be used as building frame structural parts and escalators in buildings.