| 摘要 |
In the present invention, a press-formed product is manufactured by heating a steel sheet for hot pressing use to a temperature of 900°C or above and 1,100°C or below, the steel sheet for hot pressing use having a predetermined chemical component composition, some of Ti-containing precipitates contained in the steel sheet, each of which having an equivalent circle diameter of 30 nm or less, having an average equivalent circle diameter of 6 nm or less, and the precipitated Ti amount and the total Ti amount in the steel fulfilling the relationship represented by formula (1) shown below, thereafter starting press-forming, and holding at the bottom dead point and cooling to a temperature lower than the martensite transformation starting temperature Ms while securing the average cooling rate of 20°C/s or more within a tool. Precipitated Ti amount mass % - 3.4 N < 0.5 × total Ti amount mass % - 3.4 N
(In the formula (1), [N] represents the content (mass%) of N in the steel.) |
