MANUFACTURE OF HOT DIP GALVANIZED STEEL SHEET

摘要

PURPOSE:To prevent the formation of dross on the surface of a hot dip galvanizing bath and to make spangle on a hot dip galvanized surface fine by wiping the rising part of a steel sheet on the surface of the bath with gaseous N2 contg. a prescribed percentage of steam in a sealed box. CONSTITUTION:The rising part of the steel sheet on the surface of the hot dip galvanizing bath and a gas wiping device are enclosed with the sealed box. A gaseous N2-steam mixture contg. 10-85vol% steam is spouted into the box to control the amount of zinc stuck. The inside of the box is kept in a weakly oxidizing atmosphere.