The invention relates to a method which allows high-tensile flat steel products to be manufactured with less effort in a wide range of geometric dimensions. In order to do so, a steel that forms a multiphase structure and contains 0.08 to 0.12 wt.-% of C, 1.70 to 2.00 wt.-% of Mn, up to 0.030 wt.-% of P, up to 0.004 wt.-% of S, up to 0.20 wt.-% of Si, 0.01 to 0.06 wt.-% of Al, up to 0.0060 wt.-% of N, 0.20 to 0.50 wt.-% of Cr, 0.010 to 0.050 wt.-% of Ti, 0.0010 to 0.0045 wt.-% of B, the remainder being composed of iron and inevitable impurities, is cast into a cast strip having a thickness of 1 to 4 mm, the cast strip is hot-rolled in-line into a hot-rolled strip having a thickness of 0.5 to 3.2 mm in a continuous process at a final hot-rolling temperature ranging from 800 to 1100°C, the shaping degree being greater than 20 percent, and the hot-rolled strip is coiled at a coiling temperature ranging from 250 to 570°C so as to obtain a hot-rolled strip which has a minimum tensile strength Rm of 800 MPA and a minimum breaking elongation A80 of 5 percent.
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