US 6,982,011 B1
Method for producing improved cold-rolled strip that is capable of being deep-drawn or ironed, and cold-rolled strip, preferably used for producing cylindrical containers and, in particular, battery containers
Karlfried Pfeifenbring, Düisberg (Germany); Hans-Güenter Steinmann, Düesseldorf (Germany); Ferdinand Schmidt, Düsseldorf (Germany); Werner Olberding, Velbert (Germany); and Marcel Sebastian Rubart, Dislaken (Germany)
Assigned to Hille & Mueller GmbH, Duesseldorf (Germany)
Appl. No. 10/49,152
PCT Filed Aug. 03, 2000, PCT No. PCT/EP00/07503
§ 371(c)(1), (2), (4) Date May 03, 2002,
PCT Pub. No. WO01/11114, PCT Pub. Date Feb. 15, 2001.
Claims priority of application No. 199 37 271 (DE), filed on Aug. 06, 1999.
Int. Cl. C21D 8/02 (2006.01)
U.S. Cl. 148—518 43 Claims
 
1. A method for producing improved cold band suitable for drawing or ironing process, with a carbon content of less than 0.5 weight percent, said cold band having two surfaces, the method comprising the steps of:
rolling the cold band under a cold-rolling ratio of at least 30% and less than 95%;
annealing the cold band by a thermal treatment in an annealing furnace; and
coating the cold band on at least one of the surfaces,
wherein the annealing step occurs in the form of annealing of the band in a continual annealing furnace and
wherein the annealing step occurs at a temperature of more than 911° C. and, therefore, at any rate above the limit temperature of the two-phase range ferrite/austenite (α/γ range in the iron-carbon system) to austenite range (γ range in the iron-carbon system) wherein a first coating step occurs before the annealing step, and after the annealing step, a second coating is deposited on the band.