HOT ROLLED STEEL SHEET

WIPO Patent Application WO/2020/080554

A1

This hot rolled steel sheet has a predetermined chemical composition, wherein the metallic structure in a sheet-width cross section in parallel with the rolling direction, at a 1/4 depth of the sheet thickness from the surface, and at the center position in the sheet-width direction includes, by area%, a total of 77.0-97.0% of bainite and tempered martensite, 0-5.0% of ferrite, 0-5.0% of pearlite, not less than 3.0% of retained austenite, and 0-10.0% of martensite. The average crystal particle size in the metallic structure excluding the retained austenite is not more than 7.0 μm. The C concentration in the retained austenite is not less than 0.5 mass%. The number density of iron-based carbides with a diameter of not less than 20 nm is not less than 1.0×106 pieces/mm2.

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SHUTO HIROSHI (JP)
SAKAKIBARA AKIFUMI (JP)
KAI SHINSUKE (JP)
HAYASHI KOUTAROU (JP)
KAIDO HIROSHI (JP)

PCT/JP2019/041330

April 23, 2020

October 21, 2019

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NIPPON STEEL CORP (JP)

C22C38/00; C22C38/58; C21D8/02; C21D9/46

WO2014185405A1	2014-11-20
WO2018033960A1	2018-02-22
WO2018115935A1	2018-06-28
WO2018055695A1	2018-03-29
WO2017130875A1	2017-08-03

JP2018197937A	2018-12-13
JPH1161326A	1999-03-05
JP2005179703A	2005-07-07
JP2012251200A	2012-12-20
JP2015124410A	2015-07-06
JPS6132017B2	1986-07-24
JPS59219473A	1984-12-10

See also references of EP 3868908A4

TANAI Sumio et al. (JP)

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