EP 1530649 B1 20060301 - METHOD AND DEVICE FOR CONTINUOUSLY HARDENING AND TEMPERING A STRIP OF STEEL AND USE OF THE METHOD
Title (en)
METHOD AND DEVICE FOR CONTINUOUSLY HARDENING AND TEMPERING A STRIP OF STEEL AND USE OF THE METHOD
Title (de)
VERFAHREN UND VORRICHTUNG ZUM DURCHLAUFVERGÜTEN VON BANDSTAHL SOWIE VERWENDUNG DES VERFAHRENS
Title (fr)
PROCEDE ET DISPOSITIF DE TREMPAGE ET REVENU CONTINU D'UN FEUILLARD D'ACIER ET UTILISATION DE PROCEDE
Publication
Application
Priority
- DE 0302771 W 20030819
- DE 10238972 A 20020820
Abstract (en)
[origin: WO2004018715A2] The invention relates to a method for the continuous annealing of strip steel (1), whereby the strip steel (1) is heated in a first section (11) of a first heating station (6) with a heating gradient of at least 500 K/s, then heated in a second section (12) of the first heating station (6) with a lower heating gradient to a temperature above the A3 temperature and then cooled in a cooling station (13) with a very high cooling gradient back to ambient temperature. The short-term retention of the strip steel (1) above the A3 temperature allows a complete conversion of the structure with simultaneous solution of the total carbon content, however without complete homogenisation of the carbon to give austenite. For further tempering, the strip steel (1) is heated in a first section (11) of a second heating station (7) with a high heating gradient, than further heated to the annealing temperature in a second section (12) of the second heating station (7) and held for a short period and then recooled to ambient temperature in a cooling station (13) with a very high cooling gradient. The rapid and short-term heating to the annealing temperature prevents the decomposition of the martensite needles which have been formed and thus forms a fine-grain structure in the strip steel (1) with a martensite precipitated with the finest possible needles. A strip steel (1) particularly for the production of edge elements (16) for skis snowboards sliding boards or similar is also disclosed.
IPC 8 full level
C21D 9/52 (2006.01); C21D 1/18 (2006.01); C21D 9/62 (2006.01)
CPC (source: EP)
C21D 1/18 (2013.01); C21D 9/52 (2013.01); C21D 9/62 (2013.01); C21D 2211/008 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004018715 A2 20040304; WO 2004018715 A3 20040506; AT E318937 T1 20060315; AU 2003266920 A1 20040311; AU 2003266920 A8 20040311; DE 10238972 A1 20040311; DE 10238972 B4 20040715; DE 10393626 D2 20050721; DE 50302539 D1 20060427; EP 1530649 A2 20050518; EP 1530649 B1 20060301
DOCDB simple family (application)
DE 0302771 W 20030819; AT 03747809 T 20030819; AU 2003266920 A 20030819; DE 10238972 A 20020820; DE 10393626 T 20030819; DE 50302539 T 20030819; EP 03747809 A 20030819