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1. WO2022004112 - THICK STEEL SHEET AND METHOD FOR PRODUCING SAME

Publication Number WO/2022/004112
Publication Date 06.01.2022
International Application No. PCT/JP2021/016808
International Filing Date 27.04.2021
IPC
C21D 8/02 2006.1
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
C22C 38/00 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/16 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
16containing copper
C22C 38/58 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
58with more than 1.5% by weight of manganese
Applicants
  • 株式会社神戸製鋼所 KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.) [JP]/[JP]
Inventors
  • 三大寺 悠介 SANDAIJI, Yusuke
  • 杵渕 雅男 KINEFUCHI, Masao
  • 東南 智之 TONAN, Tomoyuki
  • 川野 晴弥 KAWANO, Haruya
Agents
  • 山尾 憲人 YAMAO, Norihito
Priority Data
2020-11316630.06.2020JP
2021-04898923.03.2021JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) THICK STEEL SHEET AND METHOD FOR PRODUCING SAME
(FR) TÔLE D'ACIER ÉPAISSE ET SON PROCÉDÉ DE PRODUCTION
(JA) 厚鋼板およびその製造方法
Abstract
(EN) A thick steel sheet which has a component composition that contains from 0.02% by mass to 0.10% by mass of C, from 0.10% by mass to 0.60% by mass of Si, from 1.00% by mass to 2.00% by mass of Mn, more than 0% by mass but not more than 0.035% by mass of P, more than 0% by mass but not more than 0.035% by mass of S, from 0.10% by mass to 0.60% by mass of Cu, from 0.010% by mass to 0.060% by mass of Al, more than 0% by mass but not more than 0.050% by mass of Nb, more than 0% by mass but not more than 0.050% by mass of Ti, from 0.0010% by mass to 0.0100% by mass of N, with the balance being made up of iron and unavoidable impurities. With respect to this thick steel sheet, the total content of Si and Cu is 0.30% by mass or more, and the metal structure thereof has an MA fraction of 0.5% by area or less and a total length of small tilt angle grain boundaries of 2.5 mm or more in a 200 μm square area.
(FR) La présente invention concerne une tôle d'acier épaisse qui a une composition de composant qui contient de 0,02 % en masse à 0,10 % en masse de C, de 0,10 % en masse à 0,60 % en masse de Si, de 1,00 % en masse à 2,00 % en masse de Mn, plus de 0 % en masse mais pas plus de 0,035 % en masse de P, plus de 0 % en masse mais pas plus de 0,035 % en masse de S, de 0,10 % en masse à 0,60 % en masse de Cu, de 0,010 % en masse à 0,060 % en masse d'Al, plus de 0 % en masse mais pas plus de 0,050 % en masse de Nb, plus de 0 % en masse mais pas plus de 0,050 % en masse de Ti, de 0,0010 % en masse à 0,0100 % en masse de N, le reste étant constitué de fer et d'impuretés inévitables. Par rapport à la tôle d'acier épaisse selon l'invention, la teneur totale en Si et Cu est de 0,30 % en masse ou plus et sa structure métallique a une fraction MA de 0,5 % en surface ou moins et une longueur totale de petites limites de grain d'angle d'inclinaison de 2,5 mm ou plus dans une zone carrée de 200 µm.
(JA) 成分組成が、C:0.02~0.10質量%、Si:0.10~0.60質量%、Mn:1.00~2.00質量%、P:0質量%超0.035質量%以下、S:0質量%超0.035質量%以下、Cu:0.10~0.60質量%、Al:0.010~0.060質量%、Nb:0質量%超0.050質量%以下、Ti:0質量%超0.050質量%以下、N:0.0010~0.0100質量%、および残部:鉄および不可避不純物からなり、且つSiおよびCuの合計含有量が0.30質量%以上であり、金属組織が、MA分率が0.5面積%以下、および200μm四方の領域に観察される小傾角粒界の総長さが2.5mm以上を満たす厚鋼板。
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