ULTRAHIGH-STRENGTH MULTIPHASE STEEL WITH IMPROVED PROPERTIES DURING PRODUCTION AND PROCESSING

• Main Authors: WEDEMEIER ANDREAS, LUTHER FRIEDRICH, SPROCK WILFRIED, FLAXA VOLKER, SCHULZ SVEN, DENKS INGWER, SCHULZ THOMAS
• Format: Patent
• Language: English
• Published: 12.02.2015
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; MOTOR VEHICLES; PERFORMING OPERATIONS; TRAILERS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

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° C. and the heat-treated steel strip is subsequently cooled from the heat treatment temperature at a cooling rate of from 15 to 100° C./s to a first intermediate temperature of from 300 to 500° C. followed by cooling at a cooling rate of from 15 to 100° C./s to a second intermediate temperature of from 200 to 250° C.; the steel strip is subsequently cooled at a cooling rate of from 2 to 30° C./s in air to room temperature or the cooling at a cooling rate of from 15 to 100° C./s is maintained from the first intermediate temperature to room temperature.