HR Pickled / Oiled / Skin-passed

The scale that is left behind on hot rolled steel after it is formed is undesirable in many manufacturing applications and processes. In order to remove the scales, steel mills use acid baths. Once the coil is bathed in acid, it is “pickled”. The pickling process consist of applying dried oil to the steel’s surface in order to prevent rusting. The end product formed is known as the hot rolled pickled & oiled(HRPO) steel.