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1. (WO2018016502) STEEL FOR INDUCTION HARDENING
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Pub. No.: WO/2018/016502 International Application No.: PCT/JP2017/026002
Publication Date: 25.01.2018 International Filing Date: 19.07.2017
IPC:
C22C 38/00 (2006.01) ,C22C 38/54 (2006.01) ,C21C 7/00 (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
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
54
with boron
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
C
PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7
Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/-C21C5/118
Applicants:
新日鐵住金株式会社 NIPPON STEEL & SUMITOMO METAL CORPORATION [JP/JP]; 東京都千代田区丸の内二丁目6番1号 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071, JP
Inventors:
根石 豊 NEISHI, Yutaka; JP
志賀 聡 SHIGA, Akira; JP
宮西 慶 MIYANISHI, Kei; JP
Agent:
アセンド特許業務法人 ASCEND IP LAW FIRM; 大阪府大阪市北区堂島一丁目5番17号 5-17, Dojima 1-chome, Kita-ku, Osaka-shi, Osaka 5300003, JP
Priority Data:
2016-14188519.07.2016JP
Title (EN) STEEL FOR INDUCTION HARDENING
(FR) ACIER POUR TREMPE PAR INDUCTION
(JA) 高周波焼入れ用鋼
Abstract:
(EN) Provided is steel for induction hardening that obtains excellent fatigue strength following induction hardening. This steel for induction hardening has a chemical composition which satisfies formula (1) through formula (3) and which includes, in mass%, 0.58–0.68% C, 0.70–1.40% Si, 0.20–1.40% Mn, 0.005–0.060% Al, 0.0020–0.0080% N, and 0.0005–0.005% Ca, with the remainder comprising Fe and impurities. The steel structure comprises ferrite and pearlite, the pearlite having a surface area of at least 85%. The ratio of the number of complex inclusions, which contain at least 2.0% SiO2 and at least 2.0% CaO, relative to the total number of complex inclusions and Al2O3 inclusions in the steel is at least 20%. (1): C + Si / 7 + Mn / 5 + Cr / 9 + Mo / 2.5 ≤ 1.05 ; (2): C + Si / 10 + Mn / 20 + Cr / 25 ≥ 0.70 ; (3): Cr / Si ≤ 0.20 .
(FR) L’invention fournit un acier pour trempe par induction permettant d’obtenir une excellente résistance à la fatigue de surface après trempe par induction. L’acier pour trempe par induction de l’invention possède une composition chimique qui comprend, en % en masse, C:0,58~0,68%, Si:0,70~1,40%, Mn:0,20~1,40%, Al:0,005~0,060%, N:0,0020~0,0080% et Ca:0,0005~0,005%, le reste étant constitué de Fe et d’impuretés, et qui satisfait les formules (1) à (3). La composition de cet acier est constituée d’une ferrite, et d’une perlite de rapport surfacique supérieur ou égal à 85%. Le rapport du nombre d’inclusions composites, vis-à-vis d’inclusions composites comprenant 2,0% ou plus de SiO et 2,0% ou plus de CaO, et d’inclusions de Al, dans l’acier, est supérieur ou égal à 20%. C+Si/7+Mn/5+Cr/9+Mo/2,5≦1,05 (1)C+Si/10+Mn/20+Cr/25≧0,70 (2) Cr/Si≦0,20 (3)
(JA) 高周波焼入れ後において、優れた面疲労強度が得られる高周波焼入れ用鋼を提供する。本発明による高周波焼入れ用鋼は、質量%で、C:0.58~0.68%、Si:0.70~1.40%、Mn:0.20~1.40%、Al:0.005~0.060%、N:0.0020~0.0080%、及び、Ca:0.0005~0.005%を含有し、残部はFe及び不純物からなり、式(1)~式(3)を満たす化学組成を有する。鋼組織は、フェライト及び面積率が85%以上のパーライトからなる。鋼中の2.0%以上のSiO及び2.0%以上のCaOを含有する複合介在物及びAl介在物に対する、複合介在物の個数の比率は、20%以上である。 C+Si/7+Mn/5+Cr/9+Mo/2.5≦1.05 (1) C+Si/10+Mn/20+Cr/25≧0.70 (2) Cr/Si≦0.20 (3)
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)