Oiled sheets are metal sheets that have been coated with a thin layer of oil to prevent rust and corrosion during storage and transportation. The oil acts as a temporary protective barrier, especially important for ferrous metals like steel. Before use, these sheets are usually cleaned to remove the oil and prepare the surface for further processing or coating. Oiled sheets are common in manufacturing and construction where immediate corrosion protection is needed. They require proper handling and cleaning to ensure optimal performance.