Title:
HIGH-STRENGTH COLD-ROLLED STEEL PLATE
Document Type and Number:
WIPO Patent Application WO/2018/128067
Kind Code:
A1
Abstract:
Provided is a steel plate that is suitable for a strength member mainly for an automobile or a building material, wherein the steel plate has excellent delayed-fracture resistance, which is indicated by a tensile strength of 1180 MPa or greater, and, additionally, also has excellent primary rust resistance. On a surface of a cold-rolled steel plate having a tensile strength of 1180 MPa or greater, a coating is provided, said coating containing: one or more metal acid salts selected from molybdates and tungstates; and a phosphorus compound; wherein the total attached amount in terms of metals (Mo, W) in the metal acid salts is 10-1000 mg/m2, preferably, 50-1000 mg/m2, and the attached amount in terms of phosphorus in the phosphorus compound is 10-1000 mg/m2.
Inventors:
TSUCHIMOTO KAZUAKI (JP)
OTSUKA SHINJI (JP)
HATA KENTARO (JP)
MATSUZAKI AKIRA (JP)
OTSUKA SHINJI (JP)
HATA KENTARO (JP)
MATSUZAKI AKIRA (JP)
Application Number:
PCT/JP2017/045157
Publication Date:
July 12, 2018
Filing Date:
December 15, 2017
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C23C22/06; C22C38/04
Foreign References:
| JP2013163827A | 2013-08-22 | |||
| JP2004231992A | 2004-08-19 | |||
| JPH06346229A | 1994-12-20 | |||
| JP2003041384A | 2003-02-13 |
Other References:
See also references of EP 3567132A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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