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.
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Inventors:
MURAKAMI TOSHIO
NAKAYAMA KEITA
NAKAYAMA KEITA
Application Number:
PCT/JP2020/005370
Publication Date:
August 27, 2020
Filing Date:
February 12, 2020
Export Citation:
Assignee:
KK KOBE SEIKO SHO (KOBE STEEL LTD) (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/58
Domestic Patent References:
| WO2018025674A1 | 2018-02-08 | |||
| WO2018025675A1 | 2018-02-08 |
Foreign References:
| JP2011184757A | 2011-09-22 | |||
| JP2017527691A | 2017-09-21 | |||
| JPS548383B2 | 1979-04-14 | |||
| JP2015151576A | 2015-08-24 | |||
| JP2017053001A | 2017-03-16 | |||
| JP2019026505A | 2019-02-21 |
Other References:
See also references of EP 3901294A4
Attorney, Agent or Firm:
YAMAO, Norihito (JP)
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