EP 1380663 A1 20040114 - Cold rolled ULC - steel sheet and method of producing the same
Title (en)
Cold rolled ULC - steel sheet and method of producing the same
Title (de)
Kaltband aus ULC - Stahl und Verfahren zu seiner Herstellung
Title (fr)
Tôle en acier à très faible teneur en carbone, laminée à froid, et procédé de fabrication
Publication
Application
Priority
EP 02014692 A 20020703
Abstract (en)
Cold strip contains specified amounts of carbon, niobium, titanium, silicon, manganese, phosphorus, sulfur, aluminum, nitrogen, chromium, copper, nickel, molybdenum, tin, boron, and a balance of iron and impurities. The strip has a bake hardening property of BH0 15 N/mm squared and BH2 20 N/mm squared, good deforming properties, a yield point of 170-230 N/mm squared and an n-value of at least 0.18. Cold strip contains (in wt.%) at most 0.003 carbon, at least 0.005 niobium, 0.005 titanium, at most 0.1 silicon, at most 0.2 manganese, at most 0.015 phosphorus, at most 0.015 sulfur, 0.005-0.05 aluminum, at most 0.004 nitrogen, at most 0.05 chromium, at most 0.05 copper, at most 0.05 nickel, 0.02 molybdenum, 0.02 tin, 0.004 boron, and a balance of iron and impurities. The strip has a bake hardening property of BH0 15 N/mm squared and BH2 20 N/mm squared, good deforming properties, a yield point of 170-230 N/mm squared and an n-value of at least 0.18. An Independent claim is also included for a process for the production of the cold strip.
Abstract (de)
Die vorliegende Erfindung betrifft ein Kaltband und ein Verfahren, das mit Bake-Hardening-Eigenschaften von BH0 > 15 N/mm<2> und BH2 > 20 N/mm<2>, gute Verformungseigenschaften, eine Streckgrenze von 170 N/mm<2> bis 230 N/mm sowie einen n-Wert >= 0,18 aufweist, enthaltend (in Gew.-%) C: <= 0,0030 %, Nb: >= 0,005 % mit der Maßgabe, daß der Gehalt an Nb < (93/12) * %C beträgt, mit %C = C-Gehalt in Gew.-%, Ti: < 0,0050 %, wahlweise eines oder mehrere der folgenden Legierungselemente Si: <=0,10 %, Mn: <=0,20 %, P: <=0,015 %, S: <=0,015 %, Alg: 0,005 - 0,05 %, N: <=0,0040 %, Cr: <=0,05 %, Cu: <=0,05 %, Ni: <=0,05 %, Mo: < 0,020 %, Sn: < 0,020 %, B: < 0,0004, und als Rest Eisen sowie übliche Verunreinigungen.
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C21D 8/02 (2006.01)
CPC (source: EP)
C22C 38/004 (2013.01); C22C 38/04 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01)
Citation (search report)
- [X] US 4496400 A 19850129 - IRIE TOSHIO [JP], et al
- [X] EP 0444967 A2 19910904 - KOBE STEEL LTD [JP]
- [X] EP 0510718 A2 19921028 - KAWASAKI STEEL CO [JP]
- [XY] EP 1028172 A1 20000816 - NIPPON STEEL CORP [JP]
- [DYA] EP 0816524 A1 19980107 - NIPPON KOKAN KK [JP]
- [X] PATENT ABSTRACTS OF JAPAN vol. 005, no. 012 (C - 040) 24 January 1981 (1981-01-24)
Citation (examination)
BAKER L.C.; DANIEL S.R.; PARKER J.D.: "Metallurgy and processing of ultralow carbon bake hardening steels", MATERIAL SCIENCE AND TECHNOLOGY, vol. 18, April 2002 (2002-04-01), pages 355 - 368
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 02014692 A 20020703