HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND M

专利名称：HIGH-STRENGTH HOT-DIP GALVANIZED

STEEL SHEET AND METHOD FORPRODUCING SAME

发明人：Yusuke Fushiwaki,Yoshiyasu Kawasaki申请号：US15118231申请日：20150206

公开号：US20170166990A1公开日：20170615

摘要：Disclosed is a high-strength hot-dip galvanized steel sheet produced from asteel sheet containing Si and Mn as a base material and excellent in coating appearance,corrosion resistance, resistance to coating delamination during severe forming, andformability during severe forming. Also disclosed is a method for producing the high-strength hot-dip galvanized steel sheet. In a heating process for annealing, the following(Condition 1) to (Condition 3) are used: (Condition 1) In the heating process for annealing,the rate of temperature rise when the temperature inside an annealing furnace is in atemperature range of from 450° C. to A° C. inclusive (where A is an arbitrary valueselected in a range of 500≦A) is 7° C./sec. or more; (Condition 2) The maximum steel sheettemperature reached during the annealing is 600° C. or higher and 750° C. or lower;(Condition 3) When the temperature of the steel sheet is in a temperature range of from600° C. to 750° C. inclusive during the annealing, the transit time of the steel sheet in thetemperature range of from 600° C. to 750° C. Inclusive is 30 seconds or longer and 10minutes or shorter, and the dew point of an atmosphere is −45° C. or lower.

申请人：JFE STEEL CORPORATION

地址：Tokyo JP

国籍：JP

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