Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2005-02-15
2005-02-15
Yee, Deborah (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S601000, C148S602000, C148S661000, C148S541000
Reexamination Certificate
active
06855218
ABSTRACT:
The invention relates to a method for producing hot strip which features good forming ability and increased strength. This is achieved in that a hot strip (W) which is produced in particular from continuous casting in the shape of reheated slabs or slabs obtained directly from the casting heat, from thin slabs or cast strip, based on a steel comprising (in mass %) C: 0.001-1.05%; Si: ≦1.5%; Mn: 0.05-3.5%; Al: ≦2.5%, if necessary further elements such as Cu, Ni, Mo, N, Ti, Nb, V, Zn, B, P, Cr, Ca and/or S, with the remainder being iron as well as the usual accompanying elements, is continuously finish rolled and subsequently continuously cooled, with cooling taking place in at least two subsequent cooling phases (tCK, tLK) of accelerated cooling, to a final temperature; with the first cooling phase (tCK) of accelerated cooling starting at the latest three seconds after the last pass of finish rolling; and with the hot strip (W) during the first cooling phase (tCK) of accelerated cooling being cooled at a cooling rate of at least 150° C./s.
REFERENCES:
patent: 0072867 (1983-03-01), None
patent: 0719868 (1996-07-01), None
patent: 357002840 (1982-01-01), None
patent: 09241790 (1997-09-01), None
patent: 10195588 (1998-07-01), None
patent: WO 9739152 (1997-10-01), None
Engl Bernhard
Heller Thomas
Kawalla Rudolf
Pircher Hans
Tesè Pino
Proskauer Rose LLP
Thyssen Krupp Stahl AG
Yee Deborah
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