Patent ID: 6068887
Filing Date: 2000-05-30
Classification: C23C

Abstract:
A process for producing plated steel sheet comprising the steps of:heating a steel slab containing not more than about 0.5 wt % C, not more than about 2 wt % Si and not more than about 3 wt % Mn to a temperature range not lower than a transformation point Ac.sub.3 of said steel slab;jetting high-pressure water on a surface of a steel sheet rolled from said steel slab at a discharge pressure of at least about 300 kgf/cm.sup.2 at least once during hot rough rolling and hot finish rolling, thereby at least partially removing a layer of iron oxide on the surface of said steel sheet;coiling said steel sheet while keeping the temperature of said steel sheet in a finishing delivery temperature range from at least about 500.degree. C. to at most about 800.degree. C. so as to have a scale thickness of not less than about 2.7 .mu.m generated on the surface of the steel sheet; andreducing the thickness of the layer of iron oxide on the surface of said steel sheet at percentage not lower than 50% but not higher than 98% in an annealing furnace with the temperature of said steel sheet held in the range not lower than 750.degree. C. but not higher than 900.degree. C., and plating said steel sheet.