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1. (WO2009138586) MICRO-ALLOYED STEEL FOR HOT FORGING PARTS HAVING HIGH MECHANICAL CHARACTERISTICS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2009/138586    International Application No.:    PCT/FR2009/000492
Publication Date: 19.11.2009 International Filing Date: 27.04.2009
Chapter 2 Demand Filed:    07.12.2009    
IPC:
C22C 38/38 (2006.01), C22C 38/58 (2006.01)
Applicants: ARCELORMITTAL GANDRANGE [FR/FR]; Site Industriel de Gandrange BP 140 F-57175 Gandrange (FR) (For All Designated States Except US).
RESIAK, Bernard [FR/FR]; (FR) (For US Only).
CONFENTE, Mario [FR/FR]; (FR) (For US Only)
Inventors: RESIAK, Bernard; (FR).
CONFENTE, Mario; (FR)
Agent: VENTAVOLI, Roger; Cabinet Rove Conseils 4, cours de Lattre de Tassigny - BP 50229 F-57106 Thionville Cedex (FR)
Priority Data:
08/02671 15.05.2008 FR
Title (EN) MICRO-ALLOYED STEEL FOR HOT FORGING PARTS HAVING HIGH MECHANICAL CHARACTERISTICS
(FR) ACIER MICRO-ALLIÉ POUR FORGE À CHAUD DE PIÈCES MÉCANIQUES À HAUTES CARACTÉRISTIQUES
Abstract: front page image
(EN)The invention relates to a micro-alloyed carbon average steel grade for the hot forging of parts having high mechanical characteristics without the necessity of final tempering, characterised in that the chemical composition thereof, regardless of iron and unavoidable impurities from the production of steel from a molten state, satisfies the following conditions in weight percent: 0.1 % < C < 0.35 % 0.35 % ≤ Mo < 0.6 % 1.5 % < Mn ≤ 2.l % 0.4 % ≤ Cr < 1.5 % 0.01 % ≤ Nb < 0.l % 0.01 % ≤ Cu < 0.35 % 0.05 % 3.5 N 0.001% < N < 0.015 %; and optionally: 0.05 % < Si < 0.8 %; 0.001% < S < 0.025 %; Ni < 0.6 %; B ≤ 50 ppm; Al < 0.05 %; P < 0.015 %. By forging a hot-rolled bar from a continuous casting, and without compulsory final tempering, this steel can be used for producing ready-to-use components capable of withstanding high mechanical stresses, such as the common rails for high-pressure direct-injection engines, with a strength of 1100 to 1400 MPa and more, while preserving the workability and the welding capabilities thereof while maintaining well-controlled production costs.
(FR)Nuance d'acier moyen carbone micro-alliée pour le forgeage à chaud, sans revenu final nécessaire, de pièces à hautes caractéristiques mécaniques, caractérisée en ce que sa composition chimique, outre le fer et les inévitables impuretés résiduelles provenant de l'élaboration de l'acier à partir de l'état liquide, répond à l'analyse suivante, donnée en pourcentages pondéraux: 0,1 % ≤ C ≤ 0,35 %; 0,35 % ≤ Mo < 0,6 %; 1,5 % ≤ Mn ≤ 2,1 %; 0,4 % ≤ Cr ≤ 1,5 %; 0,01 % ≤Nb ≤ 0,1 %; 0.01 % ≤ Cu ≤ 0.35 %; 0,05 % ≤V ≤ 0,3 %; 0,005 % ≤ Ti ≤ 0,05 %, avec Ti >3,5 N; 0,001%
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, 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, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (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, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: French (FR)
Filing Language: French (FR)