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1. (WO2019050010) STEEL SHEET AND METHOD FOR PRODUCING SAME
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Pub. No.: WO/2019/050010 International Application No.: PCT/JP2018/033286
Publication Date: 14.03.2019 International Filing Date: 07.09.2018
IPC:
C22C 38/00 (2006.01) ,C21D 8/02 (2006.01) ,C22C 38/58 (2006.01)
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
02
during manufacturing of plates or strips
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
18
containing chromium
40
with nickel
58
with more than 1.5% by weight of manganese
Applicants:
JFEスチール株式会社 JFE STEEL CORPORATION [JP/JP]; 東京都千代田区内幸町二丁目2番3号 2-3, Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo 1000011, JP
Inventors:
木津谷 茂樹 KITSUYA Shigeki; JP
一宮 克行 ICHIMIYA Katsuyuki; JP
Agent:
杉村 憲司 SUGIMURA Kenji; JP
Priority Data:
2017-17327508.09.2017JP
Title (EN) STEEL SHEET AND METHOD FOR PRODUCING SAME
(FR) TÔLE D'ACIER ET SON PROCÉDÉ DE PRODUCTION
(JA) 鋼板およびその製造方法
Abstract:
(EN) The present invention stably produces a high-strength steel sheet which exhibits excellent toughness not only in the inner part of the steel sheet but also in the surface layer of the steel sheet. A steel sheet which has a component composition that contains, in mass%, from 0.080% to 0.200% (inclusive) of C, 0.40% or less of Si, from 0.50% to 5.00% (inclusive) of Mn, 0.015% or less of P, 0.0050% or less of S, 3.00% or less of Cr, 5.00% or less of Ni, 0.080% or less of Al, 0.0070% or less of N and 0.0030% or less of B, with the balance made up of Fe and unavoidable impurities. This steel sheet is configured such that: the carbon equivalent Ceq IIW is 0.57% or more; the bainite area fraction in the surface layer is 10% or more; and the yield strength is 620 MPa or more.
(FR) La présente invention produit de manière stable une tôle d'acier à haute résistance douée d'une excellente ténacité non seulement dans sa partie intérieure mais aussi dans la couche superficielle de ladite tôle d'acier. La tôle d'acier selon l'invention a une composition de composants qui contient, en % en poids, de 0,080 à 0,200 % (inclus) de C, 0,40 % ou moins de Si, de 0,50 à 5,00 % (inclus) de Mn, 0,015 % ou moins de P, 0,0050 % ou moins de S, 3,00 % ou moins de Cr, 5,00 % ou moins de Ni, 0,080 % ou moins de Al, 0,0070 % ou moins de N et 0,0030 % ou moins de B, le reste étant du Fe et d'inévitables impuretés. La tôle d'acier est conçue de façon que : l'équivalent carbone Ceq IIW soit de 0,57 % ou plus ; que la fraction bainitique dans la couche superficielle soit de 10 % ou plus ; et que la limite d'élasticité soit de 620 MPa ou plus.
(JA) 鋼板内部だけでなく鋼板表層についても、靭性に優れた高強度の鋼板を安定的に製造する。 質量%で、C:0.080%以上0.200%以下、Si:0.40%以下、Mn:0.50%以上5.00%以下、P:0.015%以下、S:0.0050%以下、Cr:3.00%以下、Ni:5.00%以下、Al:0.080%以下、N:0.0070%以下およびB:0.0030%以下を含有し、残部はFeおよび不可避的不純物の成分組成を有する鋼板であって、炭素当量CeqIIWが0.57%以上であり、表層のベイナイト面積分率が10%以上であり、降伏強度が620MPa以上である。
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)