Hot rolled dual phase steel plate with 650MPa of tensile strength and manufacturing method thereof

The invention relates to a hot rolled dual phase steel plate with 650MPa of the tensile strength and a manufacturing method thereof. The dual phase steel plate contains the ingredients by weight percent of: 0.05-0.12% of C, 0.5-1.2% of Si, 1.0-1.6% of Mn and the balance of Fe and impurities. The manufacturing method of the dual phase steel plate comprises the step: a steel billet containing the same ingredients as the hot rolled dual phase steel plate is sequentially subject to heating, heat insulation, hot rolling and continuous laminar cooling, followed by take-up. The dual phase steel plate according to the invention is designed by adopting common low carbon-silcomanganese steel, has the characteristics of low alloy cost, excellent performance, simple manufacturing process, high production efficiency and great controllability, and is liable to be implemented on traditional continuous hot rolling production line.