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Patent Searching and Data


Title:
STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2020/170910
Kind Code:
A1
Abstract:
The present invention provides a steel sheet containing prescribed amounts of prescribed elements, the balance being iron and unavoidable impurities, and the steel sheet being such that: the total area ratio of bainite, bainitic ferrite, martensite, residual austenite, and a martensite/austenite mixed structure is 95-100% inclusive; the total area ratio of ferrite and pearlite is less than 5%; the area ratio of the martensite/austenite mixed structure is 5-30% inclusive; the average length of a cut piece of the martensite/austenite mixed structure is 0.32 μm or less; and the proportion of the area of a region in which cementite is not present among ferrite, bainitic ferrite, and martensite relative to the total area of the ferrite, the bainitic ferrite, and the martensite is 3.0-5.0% inclusive.

Inventors:
MURAKAMI TOSHIO
NAKAYAMA KEITA
Application Number:
PCT/JP2020/005370
Publication Date:
August 27, 2020
Filing Date:
February 12, 2020
Export Citation:
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Assignee:
KK KOBE SEIKO SHO (KOBE STEEL LTD) (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/58
Domestic Patent References:
WO2018025674A12018-02-08
WO2018025675A12018-02-08
Foreign References:
JP2011184757A2011-09-22
JP2017527691A2017-09-21
JPS548383B21979-04-14
JP2015151576A2015-08-24
JP2017053001A2017-03-16
JP2019026505A2019-02-21
Other References:
See also references of EP 3901294A4
Attorney, Agent or Firm:
YAMAO, Norihito (JP)
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