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Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2017/164139
Kind Code:
A1
Abstract:
Provided are a high-strength hot-dip galvanized steel sheet and a method for manufacturing the same. The present invention contains in the component composition thereof, in terms of mass%, 0.05-0.15% C, 0.1% or less of Si, 1.0-2.0% Mn, 0.10% or less of P, 0.030% or less of S, 0.10% or less of Al, and 0.010% or less of N, and contains at least one of Ti, Nb, and V in a range satisfying formula (1), the remainder comprising iron and unavoidable impurities, and the structure of the present invention in terms of area ratio is at least 80% ferrite and a total of 1-20% of bainite and martensite, the average grain diameter of the ferrite being 10.0 µm or less, the average grain diameter of a combined phase of bainite and martensite being 3.0 µm or less, and the ratio of the average grain diameter of the combined phase of bainite and martensite to the average grain diameter of ferrite being 0.3 or less. (1): 0.008% ≤ 12 × (Ti/48 + Nb/93 + V/51) ≤ 0.05% (where Ti, Nb, and V represent the contents (mass%) of each element). For elements which cannot be included, calculation is performed using a content of 0 for the element in the formula.

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Inventors:
KIZU TARO (JP)
TARIGAN IMANUEL (JP)
UTAKA MINORU (JP)
OZAWA YUICHI (JP)
Application Number:
PCT/JP2017/011075
Publication Date:
September 28, 2017
Filing Date:
March 21, 2017
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/14; C22C38/60
Foreign References:
JP2010126747A2010-06-10
JP2011046999A2011-03-10
JP2013032581A2013-02-14
JP2013076114A2013-04-25
JP2013237877A2013-11-28
JP2014224317A2014-12-04
JP2015214718A2015-12-03
Other References:
See also references of EP 3412788A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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