Title:
COLD-ROLLED STEEL SHEET AND PRODUCTION METHOD THEREFOR, AND STEEL SHEET FOR ANNEALING
Document Type and Number:
WIPO Patent Application WO/2019/188667
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide: a cold-rolled steel sheet that exhibits excellent phosphate treating ability even when a phosphate-treatment solution is at low temperature; a production method therefor; and a cold-rolled steel sheet for annealing. This cold-rolled steel sheet for annealing has a coating of Si and/or a Si oxide having an average thickness of 1-20 nm disposed on the surface of a steel sheet that has a compositional makeup comprising 0.01-0.30 mass% of C, less than 0.10 mass% (inclusive of 0.0 mass%) of Si, 2.0-3.5 mass% of Mn, at most 0.05 mass% of P, at most 0.01 mass% of S, and at most 0.15 mass% of Al, with the remainder being Fe and unavoidable impurities.
Inventors:
MASUOKA HIROYUKI (JP)
FURUYA SHINICHI (JP)
MATSUZAKI AKIRA (JP)
TAKEYAMA HAYATO (JP)
FURUYA SHINICHI (JP)
MATSUZAKI AKIRA (JP)
TAKEYAMA HAYATO (JP)
Application Number:
PCT/JP2019/011723
Publication Date:
October 03, 2019
Filing Date:
March 20, 2019
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C23C22/78; C22C38/00; C22C38/06; C22C38/58; C23C28/04; C21D9/46
Domestic Patent References:
| WO2013099712A1 | 2013-07-04 |
Foreign References:
| JP2018505314A | 2018-02-22 | |||
| JP2013237912A | 2013-11-28 | |||
| JP2013060630A | 2013-04-04 | |||
| JP2003113441A | 2003-04-18 | |||
| KR20130014903A | 2013-02-12 | |||
| JP2012132092A | 2012-07-12 | |||
| JP3266328B2 | 2002-03-18 | |||
| JP3889769B2 | 2007-03-07 |
Other References:
See also references of EP 3748035A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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