LUBRICATING COATING FILM-TREATED ZINC-BASED GALVANIZED STEEL SHEET HAVING EXCELLENT PRESS WORKING PROPERTY

摘要

PROBLEM TO BE SOLVED: To provide a lubricating coating film-treated galvanized steel sheet which has sufficient lubricity in press forming, causing no problems such as breaking of the steel sheet and damage or peeling of the coating film and which has high corrosion resistance and which shows good workability in press forming.;SOLUTION: A 0.5-4 μm thick coating layer, which is obtained by blending a mixed resin containing 30-95 mass %, based on the solid content, of an acrylic/ styrene-based resin with an acid value of less than 10 and 5-70 mass %, based on the solid content, of a polyurethane-based resin with a chromium compound and 1-7 mass % of a wax particle or a thermoplastic resin particle with an average particle diameter of 1-5 μm having a melting point higher than the glass transition temperatures of the resins which compose the mixed resin, is formed on at least one surface of a galvanized steel sheet.;COPYRIGHT: (C)2001,JPO