Title:
HIGH-STRENGTH COLD-ROLLED STEEL SHEET HAVING EXCELLENT PHOSPHATABILITY AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/125525
Kind Code:
A1
Abstract:
The present invention relates to a cold-rolled steel sheet comprising: a base steel sheet; and a nickel or nickel alloy coating layer formed on the base steel sheet, wherein the adhesion amount of the nickel or nickel alloy is 50mg/m 2 or less. According to the present invention, provided are a high-strength cold-rolled steel sheet and a method for manufacturing same. In the high-strength cold-rolled steel sheet, a metal layer is coated on a cold-rolled steel sheet to a thickness of nanometers, followed by annealing, thereby suppressing the formation of oxides of Si, Mn, and the like on the surface of the steel sheet to within a range in which the elution of Fe is not suppressed, and thus the high-strength cold-rolled steel sheet has improved phosphatability.
Inventors:
KIM YOUNG-HA (KR)
KIM KWON-IL (KR)
KANG DAE-YOUNG (KR)
KIM KWON-IL (KR)
KANG DAE-YOUNG (KR)
Application Number:
PCT/KR2020/014051
Publication Date:
June 24, 2021
Filing Date:
October 15, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C25D5/50; C21D8/02; C22C38/02; C22C38/04; C23C22/12; C23C28/00; C25D3/12; C25D7/06
Foreign References:
| KR101736635B1 | 2017-05-17 | |||
| JP2002047535A | 2002-02-15 | |||
| KR19990011059A | 1999-02-18 | |||
| KR20190078425A | 2019-07-04 | |||
| US20160033416A1 | 2016-02-04 | |||
| JP6222040B2 | 2017-11-01 |
Other References:
See also references of EP 4079944A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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