Global Patent Index - EP 0971044 A1

EP 0971044 A1 2000-01-12 - Clad hot-rolled and cold-rolled steel sheet, presenting a very high resistance after thermal treatment

Title (en)

Clad hot-rolled and cold-rolled steel sheet, presenting a very high resistance after thermal treatment

Title (de)

Beschichtetes warmgewalztes und kaltgewalztes Stahlblech mit sehr hoher Festigkeit nach thermischer Behandlung

Title (fr)

Tole d'acier laminée à chaud et à froid revêtue et présentant une très haute résistance après traitement thermique

Publication

EP 0971044 A1 (FR)

Application

EP 99401690 A

Priority

FR 9808793 A

Abstract (en)

A hot rolled steel sheet, consisting of a hot dip aluminized, shaped and heat treated sheet of low alloy steel of specified composition, is new. A novel hot rolled steel sheet consists of a steel of composition (by wt.) 0.15-0.5% (exclusive) C, 0.5-3% (exclusive) Mn, 0.1-0.5% (exclusive) Si, 0.01-1% (exclusive) Cr, less than 0.2% Ti, less than 0.1% Al, less than 0.1% P, less than 0.05% S, 0.0005-0.08% (exclusive) B, balance Fe and impurities. An Independent claim is also included for forming a part from the above steel sheet having a hot dip aluminized coating which is heated at more than 5 to 600 degrees C/s. or more after sheet forming and before heat treatment. Preferred Features: The sheet is hot dip coated in a bath of composition 2-3.5% Fe and balance Al, optionally with addition of 9-10% Si.

Abstract (fr)

Tôle d'acier laminée à chaud et pouvant être ensuite laminée à froid, revêtue, l'acier de la tôle ayant la composition pondérale suivante : 0,15% < carbone < 0,5% 0,5% < manganèse < 3% 0,1% < silicium < 0,5% 0,01% < chrome < 1%, titane < 0,2%, aluminium < 0,1%, phosphore < 0,1%, soufre < 0,05%, 0,0005% < bore < 0,08%, le solde étant du fer et des impuretés inhérentes à l'élaboration, la tôle assurant une très haute résistance mécanique après traitement thermique et le revêtement à base d'aluminium assurant une haute tenue à la corrosion.

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

C22C 38/32

IPC 8 full level (invention and additional information)

C23C 2/12 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C23C 2/28 (2006.01); C23C 30/00 (2006.01)

CPC (invention and additional information)

C22C 38/32 (2013.01); C21D 8/0278 (2013.01); C22C 38/38 (2013.01); Y10S 428/939 (2013.01); Y10T 428/12757 (2013.01)

Citation (search report)

  • [Y] US 5178688 A 19930112 - YU IN-SEOK [KR], et al
  • [Y] FR 2625227 A1 19890630 - INTRAVISS SN [FR]
  • [X] PATENT ABSTRACTS OF JAPAN vol. 15, no. 017 (C - 796) 14 January 1991 (1991-01-14)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 13, no. 457 (C - 644) 16 October 1989 (1989-10-16)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 18, no. 523 (C - 1256) 4 October 1994 (1994-10-04)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 18, no. 004 (C - 1149) 6 January 1994 (1994-01-06)

Designated contracting state (EPC)

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

DOCDB simple family

EP 0971044 A1 20000112; EP 0971044 B1 20030514; AT 240419 T 20030515; BR 9902712 A 20000308; CA 2276911 A1 20000109; CA 2276911 C 20090505; DE 69907816 D1 20030618; DE 69907816 T2 20040311; DK 0971044 T3 20030811; ES 2196740 T3 20031216; FR 2780984 A1 20000114; FR 2780984 B1 20010622; JP 2000038640 A 20000208; JP 3931251 B2 20070613; PT 971044 E 20030829; US 6296805 B1 20011002