HIGH-STRENGTH ALLOYED HOT-DIPPED GALVANIZED STEEL SHEET HAVING EXCELLENT WORKABILITY AND DELAYED FRACTURE RESISTANCE, AND METHOD FOR PRODUCING SAME
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United States of America Patent
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Issued Date -
Dec 20, 2018
app pub date -
Aug 22, 2018
filing date -
Aug 22, 2018
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Abstract
Disclosed herein is a high-strength galvannealed steel sheet having a galvannealed layer on a surface of a base steel sheet and containing predetermined steel components. The steel sheet sequentially has, from the interface of the base steel sheet and the galvannealed layer, towards the base steel sheet: an internal oxide layer and containing at least one oxide selected from the group consisting of Si and Mn; a soft layer including the internal oxide layer, and satisfying a predetermined Vickers hardness; and a hard layer made up of a structure mainly composed of martensite. The average depth D of the soft layer is 20 μm or greater, and the average depth d of the internal oxide layer is 4 μm or greater and smaller than D. A coefficient of variation of KAM of the base steel sheet at the portion t/4 is 0.66 or less.
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