Hot Rolled Steel
Hot rolled sheet steel is rolled in a continuous hot strip mill at temperatures starting at about 1280°C. The steel passes through roll stands that progressively reduce it to the ordered thickness. Since the temperature at which the steel is coiled is approximately 650°C the surface of the as rolled product has a thin layer of oxide (scale.) In this condition it is referred to as “hot rolled black.” For applications where the presence of surface oxide is not acceptable it is removed by acid pickling. In this process the sheet is pickled, rinsed, dried and oiled and in this condition it is referred to as “hot rolled pickled and oiled.”
Typical applications: pipe and tube, automotive frames