Title:
HIGH STRENGTH HOT-DIP GALVANIZED STEEL SHEET WITH EXCELLENT IMPACT PEEL RESISTANCE AND WORKED SECTION CORROSION RESISTANCE
Document Type and Number:
WIPO Patent Application WO/2017/145329
Kind Code:
A1
Abstract:
A high strength hot-dip galvanized steel sheet having a hot-dip galvanized layer on a base steel sheet with a tensile strength of at least 590 MPa, characterized in that: the plated layer comprises an alloy protrusions layer that contacts the base steel sheet; the density of protrusions of the alloy protrusions layer per unit length of the interface between the base steel sheet and the plated layer when viewed from a cross-sectional direction is at least 4/mm; the maximum diameter in the alloy protrusions layer at said interface is not more than 100 µm; the base steel sheet comprises a refined layer that directly contacts the interface between the base steel sheet and the plated layer, a decarburized layer that contacts the refined layer and is present towards the interior of the base steel sheet, and an internal layer other than the refined layer and the decarburized layer; and the refined layer, decarburized layer and alloy protrusions layer have at least one kind of oxide of Si and Mn within the layers.
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Inventors:
YASUI TAKESHI (JP)
KAWATA HIROYUKI (JP)
YAMAGUCHI YUJI (JP)
KOMAMI RYOSUKE (JP)
UCHIDA SATOSHI (JP)
MURASATO AKINOBU (JP)
KAWATA HIROYUKI (JP)
YAMAGUCHI YUJI (JP)
KOMAMI RYOSUKE (JP)
UCHIDA SATOSHI (JP)
MURASATO AKINOBU (JP)
Application Number:
PCT/JP2016/055635
Publication Date:
August 31, 2017
Filing Date:
February 25, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C23C2/06; C21D9/46; C22C38/00; C22C38/06; C22C38/58; C23C2/02; C23C2/26
Domestic Patent References:
| WO2013047755A1 | 2013-04-04 | |||
| WO2013047760A1 | 2013-04-04 | |||
| WO2013154184A1 | 2013-10-17 |
Foreign References:
| JP2012251229A | 2012-12-20 | |||
| JP2011127216A | 2011-06-30 | |||
| JPH06299314A | 1994-10-25 |
Other References:
See also references of EP 3378965A4
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
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