Method of manufacturing the excellent alloyed molten Zn-plated steel sheet to low temperature chipping resistance

摘要

PURPOSE: To improve low temp. chipping resisting property by galvanizing a base steel sheet ground by a prescribed thickness by hot dip zinc-coating, then, limiting the Fe content in a plated film by heating for alloying at a prescribed temp. rising rate. ;CONSTITUTION: A fresh surface is disclosed by previously grinding the surface of the base steel sheet by 0.1 to 5g/m² thickness. The ground steel sheet is galvanized by hot dix zinc-coating and then heated for alloying in the region of 420 to 650°C plate temp. at 20°C/sec or higher temp. rising rate. Fe content in the plated film is limited to 7 to 13wt.% and only the boundary of the steel sheet-plating is made to be a high Fe content. In such a manner, both prevention of stripping caused by chipping generating at the boundary of the plating-steel sheet and maintenance of the powdering resistance and sacrifice corrosion inhibition capability are made compatible with each other.;COPYRIGHT: (C)1994,JPO&Japio