Cold-rolled and recrystallization annealed flat steel product, and method for the production thereof

A method of producing a flat steel product, the method comprising:

• providing a roll-hardened, cold-rolled flat steel product having a ferritic microstructure, the flat steel product comprising:
• 0.002% by weight or less C;
• 0.001% - 0.025% by weight Si;
• 0.05% - 0.20% by weight Mn;
• 0.001% - 0.015% by weight P;
• 0.02% - 0.055% by weight Al;
• 0.002% by weight or less Nb;
• 0.01% - 0.1% by weight Ti;
• and
• a remainder being iron and unavoidable impurities;
• heat treating the flat steel product in a continuous run through an annealing furnace under an annealing atmosphere at a dew point of −10° C. to −60° C., the annealing atmosphere comprising 1%-7% by volume of hydrogen, with a remainder being nitrogen and unavoidable impurities, wherein the flat steel product is heated up to a hold temperature T1 of 750-860° C. and is kept at the hold temperature T1 for a period t1 of 30-90 s, wherein the flat steel product is cooled from the hold temperature T1 at a cooling rate CR1 of 2-100° C./s to an overaging start temperature T2 of 400-600° C. and after cooling to the overaging start temperature T2 is cooled over a period t2 of 30-400 s at a cooling rate CR2 of 0.5-12° C./s to an overaging end temperature T3 of 250-350° C., and wherein the flat steel product after cooling to the overaging end temperature T3 is cooled at a cooling rate CR3 of 1.5-5.0° C./s to a room temperature;
• and
• temper rolling the flat steel product with a temper reduction D of 0.4-0.7% using a working temper roll having a circumferential area that comes into contact with the flat steel product having an arithmetic mean roughness Ra of 1.0-2.5 μm and a peak count RPc of at least 100 1/cm, wherein depressions and peaks shaped into a surface of the working temper roll that account for the arithmetic mean roughness Ra and the peak count RPc are in stochastic distribution.