Title:
COLD-ROLLED STEEL PLATE FOR HOT FORMING, HAVING EXCELLENT CORROSION-RESISTANCE AND SPOT-WELDABILITY, HOT-FORMED MEMBER, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2018/056792
Kind Code:
A1
Abstract:
An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1nm-100nm on the surface thereof. Formula (1): 1.4 ≤ 0.4*Cr + Si ≤ 3.2 (wherein element symbols denote measurements of respective element contents by weight %.)
Inventors:
OH JIN-KEUN (KR)
CHO YEOL-RAE (KR)
CHO A-RA (KR)
CHA JIN-HO (KR)
HEO SI-MYOUNG (KR)
SEO JEONG-WON (KR)
KIM SEONG-WOO (KR)
CHO YEOL-RAE (KR)
CHO A-RA (KR)
CHA JIN-HO (KR)
HEO SI-MYOUNG (KR)
SEO JEONG-WON (KR)
KIM SEONG-WOO (KR)
Application Number:
PCT/KR2017/010639
Publication Date:
March 29, 2018
Filing Date:
September 26, 2017
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C21D8/02; C21D9/56; C22C38/00; C22C38/02; C22C38/04; C22C38/06; C22C38/34; C22C38/38
Foreign References:
| KR20090124263A | 2009-12-03 | |||
| KR20160078851A | 2016-07-05 | |||
| JP2007113108A | 2007-05-10 | |||
| KR20140002272A | 2014-01-08 | |||
| KR20130076959A | 2013-07-09 |
Other References:
See also references of EP 3517636A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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