PURPOSE: To obtain a descaled steel strip having surface residue and plating characteristics in the same level as those of a steel plate descaled by pickling, by mechanically grinding the surface of the hot rolled steel strip after blasting a slurry on it, in descaling the strip by wet blasting.
CONSTITUTION: In descaling a hot rolled steel strip by blasting a slurry, prepared by mixing water and abrasive grain, while accelerating the slurry with highly pressurized water, the surface of strip just before or after the descaling is ground by a mechanical operation such as buffing, sanding, and brushing, for making up the descaling. Then grinding mark in the surface of strip, caused by the collision between the surface and grinding material at the time of blasting, is improved, and sticking of the grinding material crushed into fine particles is removed. Thus, a steel strip, having surface residue and micro-cross-sectional profile and plating characteristics in the same level as those of a steel strip descaled by pickling, is obtained.
MIYAZAKI RITSUSHI
NABESHIMA MASANOBU
