EP 0510249 B1 20000308 - Cold reduced non-aging deep drawing steel and method for producing
Title (en)
Cold reduced non-aging deep drawing steel and method for producing
Title (de)
Kaltverformtes und nichtalterndes Tiefziehblech aus Stahl und Herstellungsverfahren
Title (fr)
Tôle en acier formé à froid pour emboutissage avec une résistance au vieilissement et procédé de fabrication
Publication
Application
Priority
- US 69014291 A 19910423
- US 72096691 A 19910625
Abstract (en)
[origin: EP0510249A2] A cold reduced, non-aging, aluminum killed steel characterized by an elongated grain structure and having an rm value at least 1.8 produced from a slab having a reduced hot rolling temperature. A slab consisting essentially of </= 0.08% carbon, </= 0.1% acid sol. aluminum, </= 0.2% manganese, all percentages by weight, the balance iron and unavoidable impurities, is hot rolled to a sheet from a temperature less than 1260 DEG C. Preferably, the slab is continuously cast from a melt consisting essentially of 0.03-0.08% acid sol. aluminum, 0.003-0.007% total nitrogen, < 0.20% manganese, wherein % acid sol. aluminum x % total nitrogen is within the range of 1 x 10<-><4> to 5 x 10<-><4> and is hot rolled from a temperature of 1093-1175 DEG C. The hot rolled sheet is descaled, cold reduced, batch annealed and temper rolled. Preferably, the cold reduced sheet is annealed in the range of 538-649 DEG C and the temper rolled sheet has a tensile strength of 284.5-313.9 N/mm<2> (29-32 kg/mm<2>), a total elongation of at least 42% and an rm value of at least 2.0.
IPC 1-7
IPC 8 full level
C21D 8/04 (2006.01)
CPC (source: EP)
C21D 8/0426 (2013.01)
Designated contracting state (EPC)
AT BE DE ES FR GB IT NL SE
DOCDB simple family (publication)
EP 0510249 A2 19921028; EP 0510249 A3 19930908; EP 0510249 B1 20000308; AT E190359 T1 20000315; DE 69132028 D1 20000413; DE 69132028 T2 20000928; ES 2144396 T3 20000616
DOCDB simple family (application)
EP 91114828 A 19910903; AT 91114828 T 19910903; DE 69132028 T 19910903; ES 91114828 T 19910903