Method for producing a cold-rolled flat steel product aftertreated for strength enhancement, wherein a cold-rolled flat steel product is provided, with the flat steel product provided being generated by means of the following operating steps: - casting a steel having the composition as indicated below in % by weight to form a slab: - C: 0.05 - 0.25%, - Si: 0.05 - 0.6%, - Mn: 1.0 - 3.0%, - Al: 0.02 - 1.5%, - N: less than 0.02%, - P: 0.005 - 0.2%, - S: less than 0.05% - one or more elements from the group of "Cr, Mo", subject to the following provisos: - Cr: 0.2 - 1.5%, - Mo: 0.003 - 1.0%, - optionally one or more elements from the group of "Ti, Nb, B", subject to the following provisos: - B: less than 0.005% - Ti + Nb + 15*B: 0.02 - 0.15% - and optionally one or more elements from the group of "V, Cu, Ni, Ca", subject to the following provisos: - V: 0.0005 - 0.05% - Cu: 0.0001- 0.5% - Ni: 0.002 - 0.2% - Ca: 0.0005 - 0.007% - balance: iron and unavoidable impurities; - reheating the slab to a 1200 - 1300°C reheat temperature; - hot-rolling the reheated slab to give a hot strip, with the final hot-rolling temperature of the hot strip at the end of hot-rolling being 800 - 1000°C; - winding the hot strip at a winding temperature of 400 - 700°C; - pickling the hot strip; - cold-rolling the hot strip in one or more cold rolling steps to give a cold-rolled flat steel product, with the degree of cold-rolling achieved over the cold-rolling amounting in total to 20 - 80%; - subjecting the cold-rolled flat steel product to continuous annealing at a continuous-annealing temperature of 700 - 950°C; - cooling the cold-rolled flat steel product to room temperature; characterized in that the provided cold-rolled flat steel product is aftertreated for strength enhancement, wherein the following operating steps are traversed: - rerolling of the cold-rolled flat steel product, with the degree of rolling W G2 achieved over the rerolling amounting in total to 8 - 40%; - temper-annealing the rerolled flat steel product at a reannealing temperature T G2 of 100 - 400°C over an annealing time of 0.2 - 25 hours. - casting a steel having the composition as indicated below in % by weight to form a slab: - C: 0.05 - 0.25%, - Si: 0.05 - 0.6%, - Mn: 1.0 - 3.0%, - Al: 0.02 - 1.5%, - N: less than 0.02%, - P: 0.005 - 0.2%, - S: less than 0.05% - one or more elements from the group of "Cr, Mo", subject to the following provisos: - Cr: 0.2 - 1.5%, - Mo: 0.003 - 1.0%, - optionally one or more elements from the group of "Ti, Nb, B", subject to the following provisos: - B: less than 0.005% - Ti + Nb + 15*B: 0.02 - 0.15% - and optionally one or more elements from the group of "V, Cu, Ni, Ca", subject to the following provisos: - V: 0.0005 - 0.05% - Cu: 0.0001- 0.5% - Ni: 0.002 - 0.2% - Ca: 0.0005 - 0.007% - balance: iron and unavoidable impurities; - C: 0.05 - 0.25%, - Si: 0.05 - 0.6%, - Mn: 1.0 - 3.0%, - Al: 0.02 - 1.5%, - N: less than 0.02%, - P: 0.005 - 0.2%, - S: less than 0.05% - one or more elements from the group of "Cr, Mo", subject to the following provisos: - Cr: 0.2 - 1.5%, - Mo: 0.003 - 1.0%, - Cr: 0.2 - 1.5%, - Mo: 0.003 - 1.0%, - optionally one or more elements from the group of "Ti, Nb, B", subject to the following provisos: - B: less than 0.005% - Ti + Nb + 15*B: 0.02 - 0.15% - B: less than 0.005% - Ti + Nb + 15*B: 0.02 - 0.15% - and optionally one or more elements from the group of "V, Cu, Ni, Ca", subject to the following provisos: - V: 0.0005 - 0.05% - Cu: 0.0001- 0.5% - Ni: 0.002 - 0.2% - Ca: 0.0005 - 0.007% - V: 0.0005 - 0.05% - Cu: 0.0001- 0.5% - Ni: 0.002 - 0.2% - Ca: 0.0005 - 0.007% - balance: iron and unavoidable impurities; - reheating the slab to a 1200 - 1300°C reheat temperature; - hot-rolling the reheated slab to give a hot strip, with the final hot-rolling temperature of the hot strip at the end of hot-rolling being 800 - 1000°C; - winding the hot strip at a winding temperature of 400 - 700°C; - pickling the hot strip; - cold-rolling the hot strip in one or more cold rolling steps to give a cold-rolled flat steel product, with the degree of cold-rolling achieved over the cold-rolling amounting in total to 20 - 80%; - subjecting the cold-rolled flat steel product to continuous annealing at a continuous-annealing temperature of 700 - 950°C; - cooling the cold-rolled flat steel product to room temperature; - rerolling of the cold-rolled flat steel product, with the degree of rolling W G2 achieved over the rerolling amounting in total to 8 - 40%; - temper-annealing the rerolled flat steel product at a reannealing temperature T G2 of 100 - 400°C over an annealing time of 0.2 - 25 hours.