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1. (WO2006125899) STEEL FOR SUBMARINE HULLS WITH IMPROVED WELDABILITY
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2006/125899    International Application No.:    PCT/FR2006/001150
Publication Date: 30.11.2006 International Filing Date: 19.05.2006
Chapter 2 Demand Filed:    05.12.2006    
IPC:
C22C 38/00 (2006.01), C22C 38/02 (2006.01), C22C 38/08 (2006.01), C22C 38/12 (2006.01)
Applicants: INDUSTEEL FRANCE [FR/FR]; Immeuble "pacific" La Défense 7 11/13 Cours Valmy, F-92800 Puteaux (FR) (For All Designated States Except US).
BEGUINOT, Jean [FR/FR]; (FR) (For US Only).
CHAUVY, Cédric [FR/FR]; (FR) (For US Only)
Inventors: BEGUINOT, Jean; (FR).
CHAUVY, Cédric; (FR)
Agent: LAGRANGE, Jacques; Cabinet LAVOIX, 2, place d'Estienne d'Orves, F-75441 Paris Cedex 09 (FR).
JACOBSON, Claude; Cabinet Lavoix, 2, place d'Estienne d'Orves, F-75441 Paris Cedex 09 (FR)
Priority Data:
0505333 26.05.2005 FR
Title (EN) STEEL FOR SUBMARINE HULLS WITH IMPROVED WELDABILITY
(FR) ACIER POUR COQUES DE SOUS-MARINS A SOUDABILITE RENFORCEE
Abstract: front page image
(EN)The invention relates to a steel for the production of submarine hulls, which is characterised in that the chemical composition thereof comprises, by weight percent: 0.03 % $m(F) C < 0.08 %; 0.04 % $m(F) Si $m(F) 0.48 %; 0.1 % $m(F) Mn $m(F) 1.4 %; 2 % $m(F) Ni $m(F) 4 %; Cr $m(F) 0.3 %; 0.3 % $m(F) Mo + W/2 + 3 (V + Nb/2 + Ta/4) $m(F) 0.89 %; Mo $m(G) 0.15 %; V + Nb/2 + Ta/4 $m(F) 0.004 %; Nb $m(F) 0.004 %; Cu $m(F) 0.45 %; Al $m(F) 0.1 %; Ti $m(F) 0.04 %; N $m(F) 0.03 %; the remainder comprising iron and impurities resulting from production, boron being an impurity with a concentration of less than 0.0005 %, and P + S $m(F) 0.015 %, the chemical composition satisfying condition 410 $m(F) 540 x C0.25 + 245 [ Mo + W/2 + 3 (V + Nb/2 + Ta/4)]0.30 $m(F) 460. The inventive steel has an essentially martensitic or lower bainitic structure comprising at least 90 % martensite or lower bainite, at most 5 % residual austenite, at most 5 % ferrite. The steel has a yield strength of between 480 MPa and 620 Mpa and a Charpy toughness V, KCV at -60 °C of more than 50J.
(FR)Acier pour la fabrication de coques de sous-marins, caractérisé en ce que sa composition chimique comprend, en % en poids : 0,030% C < 0,080% 0,040% Si 0,48% 0,1% Mn 1,4% 2% Ni 4% Cr 0,3% 0,30% Mo + W/2 + 3 (V + Nb/2 + Ta/4) 0,89% Mo → 0,15% V + Nb/2 + Ta/4 0,004% Nb 0,004% Cu 0,45% Al 0,1% Ti 0,04% N 0,0300% le reste étant du fer et des impuretés résultant de l'élaboration, le bore étant une impureté dont la teneur est inférieure à 0,0005%, et P + S 0,015%, la composition chimique satisfaisant la condition 410 540 x C0,25 + 245 [ Mo + W/2 + 3 (V + Nb/2 + Ta/4)]0,30 460 L'acier ayant une structure essentiellement martensitique ou bainitique inférieure, comprenant au moins 90% de martensite ou de bainite inférieure, au plus 5% d'austénite résiduelle, au plus 5% de ferrite. L'acier ayant une limite d'élasticité comprise entre 480 MPa et 620 MPa, et une ténacité Charpy V, Kcv, à -60°C, supérieure à 50 J.
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, YU, 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, HU, IE, IS, IT, LT, LU, LV, MC, NL, 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)