Title:
高強度溶融亜鉛めっき鋼板およびその製造方法
Document Type and Number:
Japanese Patent JP6763479
Kind Code:
B2
Abstract:
A high-strength hot-dip galvanized steel sheet contains predetermined amounts of C, Si, Mn, P, S, N, O, sol.Al, Ti, and B, 0.1 to 1.5 mass% of Cr + 2 × Mo, and a balance in a form of Fe and inevitable impurities. A steel structure includes, in area%, ferrite: 1 to 50%, martensite: 20 to 70%, residual austenite: 0 to 5%, pearlite: 0 to 5%, MA and cementite having 0.2 µm or more grain size: 0 to 5% in total, and a balance in a form of bainite. A number density of MA or cementite having 0.2 µm or more grain size and isolated in ferrite or bainite grains is 100 pcs/1000 µm2or less, and an average hardness of martensite is in a range from 330 to 500 Hv.
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Inventors:
Takushi Yokoyama
Yuji Yamaguchi
Masahiro Nakata
Kunio Hayashi
Satoshi Uchida
Takuma Kawanaka
Yuji Yamaguchi
Masahiro Nakata
Kunio Hayashi
Satoshi Uchida
Takuma Kawanaka
Application Number:
JP2019513278A
Publication Date:
September 30, 2020
Filing Date:
March 22, 2018
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; C21D9/46; C22C38/38; C22C38/60
Domestic Patent References:
| JP2010024497A | ||||
| JP2011195883A | ||||
| JP2010156031A | ||||
| JP6323618B1 |
Attorney, Agent or Firm:
Intellectual Property Office