STEEL PLATE WHICH EXHIBITS EXCELLENT LOW-TEMPREATURE TOUGHNESS BOTH IN BASE METAL AND IN WELD-HEAT AFFECTED ZONE AND HAS SMALL STRENGTH ANISOTROPY AND PROCESS FOR MANUFACTURING SAME

WIPO Patent Application WO/2010/038470

A1

A steel plate which exhibits excellent low-temperature toughness both in base metal and in a weld-heat affected zone and has small strength anisotropy.  The steel plate has a steel composition which contains by mass% C: 0.04 to 0.10%, Si: 0.02 to 0.40%, Mn: 0.5 to 1.0%, P: 0.0010 to 0.0100%, S: 0.0001 to 0.0050%, Ni: 2.0 to 4.5%, Cr: 0.1 to 1.0%, Mo: 0.1 to 0.6%, V: 0.005 to 0.1%, Al: 0.01 to 0.08%, and N: 0.0001 to 0.0070% with the balance consisting of Fe and unavoidable impurities, and exhibits, at a depth of 1/4 of the thickness of the steel plate from the surface thereof, an Ni segregation ratio of 1.3 or lower, a prior austenite flakiness of 1.05 to 3.0, an effective grain diameter of 10μm or smaller, and a Vickers hardness of 265 to 310HV.

JPH0681001	ALLOY STEEL POWDER
JP5092554	Manufacturing method of steel materials for high-strength reinforcing bars
WO/2020/003720	ELECTRIC-RESISTANCE-WELDED STEEL PIPE FOR PRODUCING HOLLOW STABILIZER, HOLLOW STABILIZER, AND METHOD FOR PRODUCING SAME

FURUYA HITOSHI (JP)
SAITOH NAOKI (JP)
OKUSHIMA MOTOHIRO (JP)
TAKAHASHI YASUNORI (JP)

PCT/JP2009/005084

April 08, 2010

October 01, 2009

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NIPPON STEEL CORP (JP)
FURUYA HITOSHI (JP)
SAITOH NAOKI (JP)
OKUSHIMA MOTOHIRO (JP)
TAKAHASHI YASUNORI (JP)

C22C38/00; B21B1/38; B21B3/00; C21D8/02; C22C38/46; C22C38/54

JP2009263715A	2009-11-12
JP2006002236A	2006-01-05
JP2003342672A	2003-12-03
JP2003147480A	2003-05-21
JPH08277440A	1996-10-22
JPS6070120A	1985-04-20
JPH08283899A	1996-10-29
JPH03126812A	1991-05-30
JPH05125441A	1993-05-21
JPH02205627A	1990-08-15
JPS63103021A	1988-05-07

SHIGA, Masatake et al. (JP)
Masatake Shiga (JP)

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