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1. (WO2015115574) STEEL WIRE FOR SPRINGS HAVING EXCELLENT FATIGUE PROPERTIES, AND SPRING
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2015/115574    International Application No.:    PCT/JP2015/052595
Publication Date: 06.08.2015 International Filing Date: 29.01.2015
IPC:
C22C 38/00 (2006.01), C22C 38/38 (2006.01), C22C 38/58 (2006.01), C21D 8/06 (2006.01)
Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.) [JP/JP]; 2-4, Wakinohama-Kaigandori 2-chome, Chuo-ku, Kobe-shi, Hyogo 6518585 (JP)
Inventors: SUGIMURA Tomoko; .
SHIMAMOTO Masaki; .
SHINDO Yosuke; .
KAIZUKA Masaki; .
OWAKI Akihiro; .
KIMURA Sei;
Agent: EIKOH PATENT FIRM, P.C.; Toranomon East Bldg. 10F, 7-13, Nishi-Shimbashi 1-chome, Minato-ku, Tokyo 1050003 (JP)
Priority Data:
2014-014633 29.01.2014 JP
Title (EN) STEEL WIRE FOR SPRINGS HAVING EXCELLENT FATIGUE PROPERTIES, AND SPRING
(FR) FIL D'ACIER POUR RESSORTS POSSÉDANT D'EXCELLENTES PROPRIÉTÉS DE FATIGUE, ET RESSORT
(JA) 疲労特性に優れたばね用鋼線材、およびばね
Abstract: front page image
(EN) This steel wire for springs: contains specific amounts of C, Si, Mn, Cr, Al, Ca and Ti, with the remainder comprising iron and unavoidable impurities; has oxide inclusions, which are present in a cross section parallel to the longitudinal direction of the wire spring and have minor axes of at least 1 μm, containing specific amounts of CaO, Al2O3, SiO2, MgO, MnO and TiO2. The steel wire for springs satisfies CaO + Al2O3 + SiO2 + MgO + MnO + TiO2 ≥ 80%, and the number of oxide inclusions having a minor axis of 2 μm or greater present in the cross section exceeds 0.002/mm2.
(FR) L'invention concerne un fil d'acier pour ressorts qui : contient des quantités spécifiques de C, Si, Mn, Cr, Al, Ca et Ti, le reste comprenant du fer et les impuretés inévitables; possède des inclusions d'oxyde, qui sont présentes dans une coupe transversale parallèle à la direction longitudinale du ressort à fil et possèdent des petits axes d'au moins 1 μm, contenant des quantités spécifiques de CaO, Al2O3, SiO2, MgO, MnO et TiO2. Le fil d'acier pour ressorts satisfait CaO + Al2O3 + SiO2 + MgO + MnO + TiO2TiO2 ≥ 80 %, et le nombre d'inclusions d'oxyde possédant un petit axe de 2 μm ou plus présentes dans la coupe transversale dépasse 0,002/mm2.
(JA) C、Si、Mn、Cr、Al、Ca及びTiをそれぞれ特定量含有し、残部は鉄及び不可避的不純物からなり、鋼材の長手方向に平行な断面に存在する短径が1μm以上の酸化物系介在物がCaO、Al、SiO、MgO、MnO及びTiOをそれぞれ特定量含むとともに、CaO+Al+SiO+MgO+MnO+TiO≧80%を満足し、かつ、前記断面に存在する短径2μm以上の酸化物系介在物の個数が0.002個/mm超であるばね用鋼線材。
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, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, KE, KG, KN, KP, KR, 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)