ULTRA-THICK STEEL MATERIAL HAVING EXCELLENT SURFACE PART NRL-DWT PROPERTIES AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2018/117614

A1

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, 0.05-0.5% of Si, 0.01-0.05% of Al, 1.6-2.2% of Mn, 0.5-1.2% of Ni, 0.005-0.050% of Nb, 0.005-0.03% of Ti and 0.2-0.6% 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), bainite of 90 area % or greater (including 100 area %) as microstructures. And the particle size of crystallites having a high inclination angle boundary of 15° or higher measured by EBSD is 10 μm or less (not including 0μm).

WO/2014/009404	COLD-ROLLED FLAT STEEL PRODUCT AND METHOD FOR THE PRODUCTION THEREOF
WO/2015/156303	CORROSION-PROOF STEEL MATERIAL, PRODUCTION METHOD THEREFOR, METHOD FOR CORROSION PROOFING STEEL MATERIAL, AND BALLAST TANK
WO/2020/087961	80 MM LARGE-THICKNESS HIGH-TOUGHNESS LOW-ALLOY WEAR-RESISTANT STEEL PLATE AND MANUFACTURING METHOD THEREFOR

LEE HAK-CHEOL (KR)
JANG SUNG-HO (KR)

PCT/KR2017/015057

June 28, 2018

December 20, 2017

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POSCO (KR)

C22C38/04; C21D8/02; C21D9/46; C22C38/02; C22C38/06; C22C38/08; C22C38/12; C22C38/14; C22C38/16

KR20160079165A	2016-07-06
KR20150003280A	2015-01-08
KR20150086549A	2015-07-28
KR20160078927A	2016-07-05
KR20150075319A	2015-07-03

See also references of EP 3561113A4

C&S PATENT AND LAW OFFICE (KR)

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