DESCALING METHOD FOR HOT ROLLED STEEL STRIP

摘要

PURPOSE:To increase the descaling effect by applying the light rolling reduction of the specified quantity on a hot rolled steel strip and by subjecting the steel strip to the bending or bend tensile work of the prescribed surface distorsion factor or plastic elongation percentage. CONSTITUTION:The descaling device 4 composed of a leveller 3 and pickling tank is arranged with a rolling mill 2. First the light rolling reduction rolling of 0.2-2.5% is performed on a hot rolled steel strip 1 by a rolling mill 2. Then the bending of 0.2-3.0% surface distorsion factor is made by passing the steel strip 1 through the leveller 3. In this case a crack comes in the scale remaining on the surface of the steel strip 1 and the scale is efficiently removed by the pickling of the descaling device 4. The similar result is obtainable with the bend tensile working of 0.2-3.0% plastic elongation percentage via a bridle roll instead of the leveller 3. With these methods the descaling effect is increased.