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1. WO2017169811 - HIGH-STRENGTH STEEL MATERIAL AND PRODUCTION METHOD THEREFOR

Publication Number WO/2017/169811
Publication Date 05.10.2017
International Application No. PCT/JP2017/010531
International Filing Date 15.03.2017
IPC
C22C 38/00 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C21D 8/00 2006.01
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
C22C 38/58 2006.01
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
CPC
C21D 2211/004
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
2211Microstructure comprising significant phases
004Dispersions; Precipitations
C21D 6/001
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
6Heat treatment of ferrous alloys
001containing Ni
C21D 6/002
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
6Heat treatment of ferrous alloys
002containing Cr
C21D 6/005
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
6Heat treatment of ferrous alloys
005containing Mn
C21D 6/008
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
6Heat treatment of ferrous alloys
008containing Si
C21D 8/00
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
Applicants
  • 新日鐵住金株式会社 NIPPON STEEL & SUMITOMO METAL CORPORATION [JP]/[JP]
Inventors
  • 吉田 晋士 YOSHIDA, Shinji
  • 荒井 勇次 ARAI, Yuji
Agents
  • 特許業務法人ブライタス BRIGHTAS IP ATTORNEYS
Priority Data
2016-06774130.03.2016JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) HIGH-STRENGTH STEEL MATERIAL AND PRODUCTION METHOD THEREFOR
(FR) MATÉRIAU D'ACIER DE HAUTE RÉSISTANCE ET SON PROCÉDÉ DE FABRICATION
(JA) 高強度鋼材およびその製造方法
Abstract
(EN)
A high-strength steel material having a chemical composition containing, in mass%, 0.30-1.0% of C, 0.05-1.0% of Si, 16.0-35.0% of Mn, 0.030% or less of P, 0.030% or less of S, 0.003-0.06% of Al, 0.1% or less of N, 0-3.0% of V, 0-1.5% of Ti, 0-1.5% of Nb, 0-5.0% of Cr, 0-3.0% of Mo, 0-1.0% of Cu, 0-1.0% of Ni, 0-0.02% of B, 0-0.5% of Zr, 0-0.5% of Ta, 0-0.005% of Ca, and 0-0.005% of Mg, the remaining portion being Fe and impurities, wherein [V + Ti + Nb > 2.0] is satisfied, the density of the number of carbides/carbonitrides deposited in the steel and having a circle equivalent diameter of 5-30 nm is 50-700 /μm2, and the density of the number of carbides/carbonitrides having a circle equivalent diameter of more than 100 nm is less than 10 /μm2, and the steel material has a yield stress of 758 MPa or more, and a KISSC value of 33.7 MPa·m0.5 or more as measured in the DCB test.
(FR)
L'invention concerne un matériau d'acier de haute résistance ayant une composition chimique contenant, en pourcentage massique, de 0,30 à 1,0 % de C, de 0,05 à 1,0 % de Si, de 16,0 à 35,0 % de Mn, 0,030 % ou moins de P, 0,030 % ou moins de S, de 0,003 à 0,06 % d'Al, 0,1 % ou moins de N, de 0 à 3,0 % de V, de 0 à 1,5 % de Ti, de 0 à 1,5 % de Nb, de 0 à 5,0 % de Cr, de 0 à 3,0 % de Mo, de 0 à 1,0 % de Cu, de 0 à 1,0 % de Ni, de 0 à 0,02 % de B, de 0 à 0,5 % de Zr, de 0 à 0,5 % de Ta, de 0 à 0,005 % de Ca et de 0 à 0,005 % de Mg, la partie restante étant du Fe et des impuretés, la relation [V + Ti + Nb = 2,0] étant satisfaite, la densité du nombre de carbures/carbonitrures déposés dans l'acier et ayant un diamètre de cercle équivalent de 5 à 30 nm étant de 50 à 700/μm2, et la densité du nombre de carbures/carbonitrures ayant un diamètre de cercle équivalent de plus de 100 nm étant inférieure à 10/μm2, et le matériau d'acier ayant une limite d'élasticité de 758 MPa ou plus et une valeur KISSC de 33,7 MPa · m0,5 ou plus, telle que mesurée lors d'un essai DCB.
(JA)
化学組成が、質量%で、C:0.30~1.0%、Si:0.05~1.0%、Mn:16.0~35.0%、P:0.030%以下、S:0.030%以下、Al:0.003~0.06%、N:0.1%以下、V:0~3.0%、Ti:0~1.5%、Nb:0~1.5%、Cr:0~5.0%、Mo:0~3.0%、Cu:0~1.0%、Ni:0~1.0%、B:0~0.02%、Zr:0~0.5%、Ta:0~0.5%、Ca:0~0.005%、Mg:0~0.005%、残部:Feおよび不純物であり、[V+Ti+Nb>2.0]を満足し、鋼中に析出する円相当直径が5~30nmの炭化物/炭窒化物の個数密度が50~700個/μm2であり、かつ、円相当直径が100nm超の炭化物/炭窒化物の個数密度が10個/μm2未満であり、降伏応力が758MPa以上であり、DCB試験によるKISSCの値が33.7MPa・m0.5以上である、高強度鋼材。
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