Salzgitter Flachstahl Gmbh

Wilfried Sprock

Friedrich Luther

Volker Flaxa

Thomas Schulz

Ingwer Denks

Andreas Wedemeier

Sven Schulz

In a process for producing a cold- or hot-rolled steel strip from an ultrahigh-strength multiphase steel having a particular composition the required multiphase microstructure is generated during continuous heat treatment. The cold- or hot-rolled steel strip is heated in the continuous heat treatment furnace to a temperature in the range from 700 to 950&#xb0; C. and the heat-treated steel strip is subsequently cooled from the heat treatment temperature at a cooling rate of from 15 to 100&#xb0; C./s to a first intermediate temperature of from 300 to 500&#xb0; C. followed by cooling at a cooling rate of from 15 to 100&#xb0; C./s to a second intermediate temperature of from 200 to 250&#xb0; C.; the steel strip is subsequently cooled at a cooling rate of from 2 to 30&#xb0; C./s in air to room temperature or the cooling at a cooling rate of from 15 to 100&#xb0; C./s is maintained from the first intermediate temperature to room temperature.

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Braunschweig, Germany

Wilfried Sprock