ULTRA-THICK STEEL SHEET WITH EXCELLENT STRENGTH AND LOW-TEMPERATURE IMPACT TOUGHNESS, AND MANUFACTURING METHOD THEREFOR

WIPO Patent Application WO/2022/139135

A1

Provided in the present specification is an ultra-thick steel sheet with excellent strength and low-temperature impact toughness, and a manufacturing method therefor. Disclosed are an ultra-thick steel sheet with excellent strength and low-temperature impact toughness, and a manufacturing method therefor, the steel sheet being applicable to various industries such as those of various frames of ships and offshore structures, materials for infrastructure industries such as bridges and construction, and materials for wind substructures. According to one embodiment of the disclosed ultra-thick steel sheet, the ultra-thick steel sheet comprises, by wt%, 0.06-0.1% of C, 0.3-0.5% of Si, 1.35-1.65% of Mn, 0.015-0.04% of Al, 0.015-0.04% of Nb, 0.15-0.4% of Cr, 0.005-0.02% of Ti, 0.3-0.5% of Ni, 0.002-0.008% of N, 0.01% or less of P, 0.003% or less of S, and the balance of Fe and other inevitable impurities, wherein the microstructure can comprise, by area fraction, polygonal ferrite having an average grain size of 40 μm or less in an amount that is more than 80%, and the balance of pearlite having an average grain size of 20 μm or less.

KIM WOOGYEOM (KR)
KIM SANGHO (KR)
BAEK DAEWOO (KR)

PCT/KR2021/014121

June 30, 2022

October 13, 2021

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POSCO (KR)

C22C38/58; C21D8/02; C21D9/46; C22C38/48; C22C38/50

JPH0860239A	1996-03-05
KR20160075925A	2016-06-30
KR20180073075A	2018-07-02
JPH06200351A	1994-07-19
KR20120074638A	2012-07-06
KR20200179359A

SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)

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