EP 1704261 B1 20120613 - BAKE-HARDENABLE COLD ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY, AND METHOD OF MANUFACTURING THE SAME
Title (en)
BAKE-HARDENABLE COLD ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY, AND METHOD OF MANUFACTURING THE SAME
Title (de)
DURCH BAKE-HARDENUNG HÄRTBARES KALTGEWALZTES STAHLBLECH MIT HERVORRAGENDER FORMBARKEIT UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER LAMINE A FROID DURCI AU FOUR PRESENTANT UNE EXCELLENTE FORMABILITE, ET PROCEDE DE FABRICATION DUDIT ACIER
Publication
Application
Priority
- KR 2004003375 W 20041221
- KR 20030095393 A 20031223
- KR 20030095395 A 20031223
- KR 20030095394 A 20031223
- KR 20030098745 A 20031229
- KR 20030098744 A 20031229
- KR 20030099437 A 20031229
- KR 20030099435 A 20031229
- KR 20030098743 A 20031229
- KR 20030098746 A 20031229
- KR 20030099350 A 20031229
- KR 20030099351 A 20031229
- KR 20030099463 A 20031230
- KR 20030099462 A 20031230
- KR 20030099464 A 20031230
- KR 20030099461 A 20031230
- KR 20040071395 A 20040907
- KR 20040071705 A 20040908
- KR 20040084297 A 20041021
Abstract (en)
[origin: TW200533765A] A bake-hardenable cold rolled steel sheet, and a method of manufacturing the same, designed to have bake hardenability and excellent formability suitable for automobile bodies, and the like. The steel sheet comprises 0.003~0.005% C, 0.003~0.03% S, 0.01~0.1% Al, 0.02% or less N, 0.2% or less P, 0.03~0.2% Mn and/or 0.005~0.2% Cu, and the balance of Fe and other unavoidable impurities in terms of weight%. When it comprises one of Mn and Cu, the composition of Mn, Cu, and S satisfies one of relationships: 0.58*Mn/S≤10 and 1≤0.5*Cu/S≤10. When it comprises both Mn and Cu, the composition satisfies the relationships: Mn+Cu≤0.3 and 2≤0.5*(Mn+Cu)/S≤20. MnS, CuS, and (Mn, Cu)S precipitates have an average size of 0.2 um or less. The steel sheets allow the content of solid solution to be controlled by fine MnS, CuS, (Mn, Cu)S precipitates, providing improved bake hardenability, formability, yield strength, and yield strength-ductility balance.
IPC 8 full level
C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01); C22C 38/18 (2006.01)
CPC (source: EP)
C21D 9/46 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/12 (2013.01); C22C 38/18 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1704261 A1 20060927; EP 1704261 A4 20080924; EP 1704261 B1 20120613; ES 2389656 T3 20121030; JP 2007517138 A 20070628; JP 4439525 B2 20100324; TW 200533765 A 20051016; TW I361223 B 20120401
DOCDB simple family (application)
EP 04808506 A 20041221; ES 04808506 T 20041221; JP 2006546817 A 20041221; TW 93140008 A 20041222