Global Patent Index - EP 1083241 A1

EP 1083241 A1 2001-03-14 - Ferritic niobium-stabilised 14% chromium steel and its use in the car industry

Title (en)

Ferritic niobium-stabilised 14% chromium steel and its use in the car industry

Title (de)

Ferritisches Niobium-stabilisiertes 14% Chrom-stahl und dessen Verwendung in Kraftfahrzeugen

Title (fr)

Acier ferritique à 14% de chrome stabilisé au niobium et son utilisation dans le domaine de l'automobile

Publication

EP 1083241 A1 (FR)

Application

EP 00402447 A

Priority

FR 9911257 A

Abstract (en)

Niobium stabilized ferritic chromium steel strip is produced from a steel having specified molybdenum, silicon and tin contents and containing a cubic iron-niobium phase as the sole intermetallic phase at high temperature. A niobium stabilized ferritic 14% chromium steel strip is produced from a steel of composition (by wt.) 0.02% C, 0.002-0.02% N, 0.05-1% Si, greater than 0 to 1% Mn, 0.2-0.6% Nb, 13.5-16.5% Cr, 0.02-1.5% Mo, greater than 0 to 1.5% Cu, greater than 0 to 0.2% Ni, greater than 0 to 0.020% P, greater than 0 to 0.003% S, greater than 0.005 to 0.04% Sn, balance Fe and impurities, the Nb, C and N contents satisfying the relationship Nb/(C + N) 9.5, by: (a) reheating before hot rolling at 1150-1250 (preferably 1175) degrees C; (b) coiling at 600-800 (preferably 600) degrees C; (c) cold rolling, optionally after pre-annealing; and (d) final annealing at 800-1100 (preferably 1050) degrees C for 1-5 (preferably 2) min. An Independent claim is also included for a niobium stabilized 14% chromium ferritic steel sheet obtained by the above process.

Abstract (fr)

Procédé de réalisation d'une bande de tôle en acier ferritique dit à 14% de chrome stabilisé au niobium, caractérisé en ce que l'acier de composition pondérale suivante : carbone <= 0,02% ; 0,002% <= azote <= 0,02%, ; 0,05% <= silicium <= 1% ; 0% < manganèse <= 1% ; 0,2% <= niobium <= 0,6% ; 13,5% <= chrome <= 16,5% ; 0.02% <= molybdène <= 1.5% ; 0% < cuivre <= 1,5% ; 0% < nickel <= 0.2% ;0% < phosphore <= 0,020% ; 0% < soufre <= 0,003% ; 0,005% < étain <= 0,04% ; les impuretés inhérentes à l'élaboration la teneur en niobium, carbone, azote satisfaisant la relation: 9.5<= Nb/(C+N) est soumis à : un laminage à froid de la tôle à chaud avec ou sans recuit préalable, un recuit final de la bande de tôle à une température comprise entre 800°C et 1100°C pendant une durée comprise entre 1 mn et 5 mn et de préférence à une température d'environ 1050°C pendant un temps d'environ 2 mn.

IPC 1-7 (main, further and additional classification)

C22C 38/26; C21D 8/02

IPC 8 full level (invention and additional information)

C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01)

CPC (invention and additional information)

C22C 38/001 (2013.01); C21D 8/0205 (2013.01); C22C 38/008 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 1083241 A1 20010314; EP 1083241 B1 20041110; AT 282096 T 20041115; BR 0004032 A 20010403; BR 0004032 B1 20100406; DE 60015682 D1 20041216; DE 60015682 T2 20051215; ES 2233308 T3 20050616; FR 2798394 A1 20010316; FR 2798394 B1 20011026; PT 1083241 E 20050331; US 2002129877 A1 20020919; US 6423159 B1 20020723; US 6921440 B2 20050726

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