Title:
STEEL SHEET FOR HOT STAMPING
Document Type and Number:
WIPO Patent Application WO/2019/186927
Kind Code:
A1
Abstract:
This steel sheet for hot stamping, which serves as a raw material for a hot-stamped formed product offering excellent strength or bending deformability, is characterized by having a prescribed component composition and is also characterized in that: the microstructure contains 90% or more lower bainite, martensite, and/or tempered martensite in terms of area ratio; the X-ray random intensity ratio of {112}<111> of the crystal grains constituting the lower bainite, martensite, or tempered martensite is 2.8 or higher; the number density of cementite and epsilon carbide having a grain size of 50 nm or smaller is 1×1016/cm3 or higher in total; and a grain boundary solid/solution ratio Z, defined as Z = (mass% of Nb and/or Mo at the grain boundary)/(mass% of Nb and/or Mo at dissolution), is 0.4 or higher.
Inventors:
TODA YURI (JP)
HIKIDA KAZUO (JP)
FUJINAKA SHINGO (JP)
TANAKA TOMOHITO (JP)
HIKIDA KAZUO (JP)
FUJINAKA SHINGO (JP)
TANAKA TOMOHITO (JP)
Application Number:
PCT/JP2018/013360
Publication Date:
October 03, 2019
Filing Date:
March 29, 2018
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D1/18; C21D9/00; C21D9/46; C22C38/60
Domestic Patent References:
| WO2011158818A1 | 2011-12-22 | |||
| WO2015147216A1 | 2015-10-01 |
Foreign References:
| JP6187729B1 | 2017-08-30 | |||
| JP2017043825A | 2017-03-02 | |||
| JP2010174283A | 2010-08-12 | |||
| JP2013527312A | 2013-06-27 | |||
| JP2014118613A | 2014-06-30 | |||
| JP5369714B2 | 2013-12-18 | |||
| JPS5114691B1 | 1976-05-11 | |||
| JP2014015638A | 2014-01-30 | |||
| JP2002309345A | 2002-10-23 |
Other References:
FUMIO KUROSAWAISAMU TAGUCHIRYUTARO MATSUMOTO, JOURNAL OF THE JAPAN INSTITUTE OF METAL MATERIALS, vol. 43, 1979, pages 1068
See also references of EP 3778948A4
See also references of EP 3778948A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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