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AssigneeBaoshan Iron & Steel Co., Ltd.
InventorsXinyan Jin, Yong Zhong, Meng Chen, Xufei Li, Li Wang
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The present invention provides a method for manufacturing a hot-dip galvanized steel sheet, comprising performing a heat treatment step, a hot dip plating step, and an alloying treatment step on a steel sheet having high Si and Mn content. The heat treatment step comprises a first heating phase and a soaking phase; a first heating atmosphere of the first heating stage contains 0.01-0.5% of O2 by volume, and the balance is N2 and inevitable impurities; a soaking atmosphere of the soaking stage contains 0.5% or more of H2 by volume, and the balance is N2 and inevitable impurities; dew points of the first heating atmosphere and the soaking atmosphere are controlled to be ≥−20° C. the method of the present invention, a hot-dip galvanized steel sheet having both a plating layer of sufficient Fe content and a high elongation at break rate can be obtained.
A manufacturing method for a hot-dip galvanized steel sheet, including performing sequentially a heat treatment step, a hot-dip galvanization step, and an alloying treatment step on a base steel sheet containing 0.5% or more of Si and 0.5% or more of Mn by mass, wherein:
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