EP 1498506 A1 20050119 - High tensile strength cold-rolled steel sheet having a high r-value, excellent strain age hardenability and natural aging resistance and method of producing the same
Title (en)
High tensile strength cold-rolled steel sheet having a high r-value, excellent strain age hardenability and natural aging resistance and method of producing the same
Title (de)
Hochfestes Kaltgewalztes Stahlblech mit hoch r-Wert, exzellenter Reckalterungseigenschaften und Alterungsbeständigkeit sowie Verfahren zur dessen Herstellung
Title (fr)
Tôle d'acier à haute resistance laminée a froid ayant une haute r-valeur, excellente aptitude au durcissement au vieillissement par écrouissage et son procédé de fabrication
Publication
Application
Priority
- EP 01906128 A 20010214
- JP 2000156274 A 20000526
- JP 2000193717 A 20000628
- JP 2000328924 A 20001027
- JP 2000335803 A 20001102
Abstract (en)
An object of the present invention is to provide a cold-rolled steel sheet and an alloyed hot-dip galvanized steel sheet in which tensile strength is effectively increased by press forming and heat treatment while maintaining excellent deep drawability in press forming. Specifically, a steel composition contains less than 0.01% of C, 0.005 to 1.0% of Si, 0.01 to 1.0% of Mn, 0.005 to 0.050% of Nb, 0.005 to 0.030% of Al, 0.005 to 0.040% of N, 0.0005 to 0.0015% of B, 0.05% or less of P, and 0.01% or less of S, the balance substantially composed of Fe, in which the following equations (1) and (2) are satisfied: N% ≥0.0015 + 14/93•Nb% + 14/27•Al% + 14/11•B% C% ≤ (12/93)•Nb% <IMAGE>
IPC 1-7
C22C 38/00; C22C 38/06; C22C 38/58; C21D 9/46; C22C 38/04; C21D 8/02
IPC 8 full level
C21D 8/02 (2006.01); C21D 8/04 (2006.01); C21D 9/48 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C21D 1/18 (2006.01)
CPC (source: EP KR)
C21D 8/0236 (2013.01 - EP); C21D 8/0273 (2013.01 - EP); C21D 8/0426 (2013.01 - EP); C21D 9/48 (2013.01 - EP); C22C 38/00 (2013.01 - KR); C22C 38/001 (2013.01 - EP); C22C 38/004 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/12 (2013.01 - EP); C21D 1/185 (2013.01 - EP); C21D 8/0226 (2013.01 - EP); C21D 8/0436 (2013.01 - EP); C21D 8/0473 (2013.01 - EP); C21D 2211/005 (2013.01 - EP); C21D 2211/008 (2013.01 - EP)
Citation (search report)
- [A] EP 0943696 A1 19990922 - KAWASAKI STEEL CO [JP], et al
- [A] US 5690755 A 19971125 - YOSHINAGA NAOKI [JP], et al
- [A] US 5123969 A 19920623 - CHOU TUNG-SHENG [TW]
- [A] US 5405463 A 19950411 - SHIMOMURA TAKAYOSHI [JP], et al
- [A] EP 0608430 A1 19940803 - NIPPON STEEL CORP [JP]
- [A] US 4838955 A 19890613 - EDELMAN ARIE B C [NL], et al
- [A] US 5582658 A 19961210 - MASUI SUSUMU [JP], et al
- [AD] PATENT ABSTRACTS OF JAPAN vol. 009, no. 184 (C - 294) 30 July 1985 (1985-07-30)
- [A] PATENT ABSTRACTS OF JAPAN vol. 009, no. 306 (C - 317) 3 December 1985 (1985-12-03)
- [A] PATENT ABSTRACTS OF JAPAN vol. 1995, no. 07 31 August 1995 (1995-08-31)
Designated contracting state (EPC)
BE DE FR GB IT
DOCDB simple family (publication)
EP 1291448 A1 20030312; EP 1291448 A4 20040630; EP 1291448 B1 20060628; CA 2379698 A1 20011129; CA 2379698 C 20090217; CN 1158398 C 20040721; CN 1386140 A 20021218; DE 60121162 D1 20060810; DE 60121162 T2 20061109; DE 60121233 D1 20060810; DE 60121233 T2 20061109; DE 60121234 D1 20060810; DE 60121234 T2 20061109; EP 1498506 A1 20050119; EP 1498506 B1 20060628; EP 1498507 A1 20050119; EP 1498507 B1 20060628; KR 20020019124 A 20020309; TW 565621 B 20031211; WO 0190431 A1 20011129
DOCDB simple family (application)
EP 01906128 A 20010214; CA 2379698 A 20010214; CN 01802186 A 20010214; DE 60121162 T 20010214; DE 60121233 T 20010214; DE 60121234 T 20010214; EP 04023082 A 20010214; EP 04023101 A 20010214; JP 0101004 W 20010214; KR 20027001080 A 20020125; TW 90103293 A 20010214