1500 MPa-grade high-strength-ductility vehicle steel and manufacturing method thereof

The invention discloses a 1500 MPa-grade high-strength-ductility vehicle steel, which comprises the following chemical elements by mass: 0.1-0.3% of C, 0.1-2.0% of Si, 7.5-12% of Mn, 0.01-2.0% of Al, and the balance of iron and other unavoidable impurities, wherein the microstructure of the 1500 MPa-grade high-strength-ductility vehicle steel is austenite and martensite and ferrite or austenite and martensite. Correspondingly the invention further discloses a manufacturing method of the 1500 MPa-grade high-strength-ductility vehicle steel. According to the present invention, the 1500 MPa-grade high-strength-ductility vehicle steel can achieve the 1500 MPa grade, and the strength-ductility is not less than 30 GPa%.