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Title:
ZINC HOT-DIPPED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2019/026116
Kind Code:
A1
Abstract:
In a specific thickness range centering on ¼ of the thickness from the surface of the parent material steel sheet, the ferrite phase has a volume fraction of 0% to less than 50%, the total of hard structures comprising one or more of bainite structure, bainitic ferrite phase, fresh martensite phase and tempered martensite phase has a volume fraction of at least 50%, retained austenite phase has a volume fraction of 0% to 8%, the total of pearlite phase and coarse cementite phase has a volume fraction of 0% to 8%, and at the interface between the plated layer and the parent material steel sheet, there is an Fe-Al alloy layer having an average thickness of 0.1-2.0 µm, and a difference between the maximum thickness and minimum thickness in the steel plate width direction of within 0.5 µm. In a refined layer which is in direct contact with the Fe-Al alloy layer, the difference between the maximum thickness and minimum thickness of the refined layer in the width direction of the steel plate is within 2.0 µm.

Inventors:
MORISHITA, Atsushi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
KANETO, Taihei (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
UCHIDA, Satoshi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
NAKADA, Tatsuya (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
YAMAGUCHI, Yuji (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2017/027659
Publication Date:
February 07, 2019
Filing Date:
July 31, 2017
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
C22C38/00; C21D9/46; C22C38/58; C23C2/06; C23C2/40
Domestic Patent References:
WO2013047821A12013-04-04
WO2013047812A12013-04-04
Foreign References:
JP2013163827A2013-08-22
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (5th Floor, NBF Ikebukuro City Building 17-8, Higashi-Ikebukuro 1-chome, Toshima-k, Tokyo 13, 〒1700013, JP)
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