Title:
ULTRA-THICK STEEL MATERIAL HAVING EXCELLENT SURFACE PART NRL-DWT PROPERTIES AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2018/117650
Kind Code:
A1
Abstract:
Disclosed are a high-strength ultra-thick steel material and a method for manufacturing same. The high-strength ultra-thick steel material comprises in weight % 0.04-0.1% of C, 1.2-2.0% of Mn, 0.2-0.9% of Ni, 0.005-0.04% of Nb, 0.005-0.03% of Ti and 0.1-0.4% of Cu, 100ppm or less of P and 40ppm or less of S with a balance of Fe, and inevitable impurities, and comprises, in a subsurface area up to t/10 (t hereafter being referred to as the thickness of the steel material), polygonal ferrite of 50 area % or greater (including 100 area %) and bainite of 50 area % or less (including 0 area %) as microstructures.
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Inventors:
LEE HAK-CHEOL (KR)
JANG SUNG-HO (KR)
JANG SUNG-HO (KR)
Application Number:
PCT/KR2017/015141
Publication Date:
June 28, 2018
Filing Date:
December 20, 2017
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/04; C21D8/02; C21D9/46; C22C38/08; C22C38/12; C22C38/14; C22C38/16
Foreign References:
| KR20150112489A | 2015-10-07 | |||
| KR20160078927A | 2016-07-05 | |||
| KR101597789B1 | 2016-02-26 | |||
| KR20160079165A | 2016-07-06 | |||
| JP2004277858A | 2004-10-07 |
Other References:
See also references of EP 3561112A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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