Steel for hot forming and manufacturing method thereof

The invention discloses steel for hot forming and a manufacturing method thereof, and belongs to the technical field of material heat treatment, the steel comprises the following main chemical components in percentage by mass: 0.20%-0.35% of C, 0.01%-0.50% of Si, 0.50%-1.50% of Mn, less than or equal to 0.02% of P, less than or equal to 0.01% of S, 0.02%-0.05% of Al, less than or equal to 0.50% of Cr, 0.002%-0.005% of B, 0.05%-0.1% of Ti + Nb + V, less than or equal to 0.5% of Mo and the balance of Fe and inevitable impurities, the steel for hot forming is prepared by adopting a cover annealing process, and the thickness of the steel is less than or equal to 0.5 mm. And the annealing temperature T satisfies Ac1-50 DEG C < T < Ac1, and Ac1 is 707-732 DEG C. The prepared steel for hot forming satisfies the following conditions: the yield strength is 950-1200 MPa, the tensile strength is greater than or equal to 1500 MPa, and the ductility (A80) is greater than or equal to 9%. 本发明公开了一种热成形用钢及其制造方法，属于材料热处理技术领域，钢的主