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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
C22C 38/00 (2006.01), C22C 38/54 (2006.01), C21C 7/00 (2006.01)
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION [JP/JP]; 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071 (JP)
Inventors: NEISHI, Yutaka; (JP).
SHIGA, Akira; (JP).
Agent: ASCEND IP LAW FIRM; 5-17, Dojima 1-chome, Kita-ku, Osaka-shi, Osaka 5300003 (JP)
Priority Data:
2016-141885 19.07.2016 JP
(JA) 高周波焼入れ用鋼
Abstract: front page image
(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 (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (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)