ULTRATHICK STEEL MATERIALS FOR FLANGE HAVING EXCELLENT STRENGTH AND LOW TEMPERATURE IMPACT TOUGHNESS, AND MANUFACTURING METHOD THEREFOR

WIPO Patent Application WO/2023/121179

A1

Provided is an ultrathick steel material for a flange having excellent strength and low-temperature impact toughness, and a manufacturing method therefor. The steel material of the present invention comprises, in weight%, C: 0.05-0.2%, Si: 0.05-0.5%, Mn: 1.0-2.0%, Al: 0.005-0.1%, P: 0.01% or less, S: 0.015% or less, Nb: 0.005-0.07%, V: 0.001-0.3%, Ti: 0.001-0.05%, Cr: 0.01-0.3%, Mo: 0.01-0.12%, Cu: 0.01-0.6%, Ni: 0.05-4.0%, Ca: 0.0005-0.004%, and the balance being Fe and other unavoidable impurities, wherein the steel material has a microstructure having a spherical austenite crystallite grain size of 35 μm or less and including 90 area% or more of at least one of bainite and martensite, and residual ferrite or pearlite.

JPS63145717	PRODUCTION OF LOW YIELD RATIO HIGH TENSILE STEEL PLATE
JP4522785	Stainless steel contact material
WO/2015/190422	HIGH STRENGTH DUPLEX STAINLESS STEEL WIRE ROD, HIGH STRENGTH DUPLEX STAINLESS STEEL WIRE AND MANUFACTURING METHOD THEREFOR AS WELL AS SPRING COMPONENT

KIM DAE-WOO (KR)
LEE HONG-JU (KR)
BAEK DAE-WOO (KR)

PCT/KR2022/020718

June 29, 2023

December 19, 2022

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POSCO CO LTD (KR)

C22C38/58; B21B1/02; B21B1/04; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50

JP2008127595A	2008-06-05
KR101051241B1	2011-07-21
KR20140052094A	2014-05-07
KR101286121B1	2013-07-17
US20180057904A1	2018-03-01

C&S PATENT AND LAW OFFICE (KR)

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