METHOD FOR TEMPER-ROLLING OF GALVANIZED STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To satisfy press-formability and image clarity after painting without necessitating many trial and error by giving the working condition of a temper- rolling roll and the temper-rolling condition using the roll without necessitating expensive equipment. SOLUTION: In this method of temper-rolling of a galvanized steel sheet, the temper rolling is performed by using the temper-rolling roll the center line average roughness Ra(r) of the roll surface of which is 2.0 to 4.0μm and the peak count PPI(r) (Peaks Per Inch) (cut off 0.635μm) of which satisfies relationship: PPI(r)>=(30×Ra(r)+130).