1300 MPa-grade high-elongation low-delay cracking sensitivity hot forming steel and production method thereof

The invention discloses 1300 MPa-grade high-elongation low-delay cracking sensitivity hot forming steel and a production method thereof. The 1300 MPa-grade high-elongation low-delay cracking sensitivity hot forming steel comprises the following components in percentage, by weight, 0.14 to 0.18 percent of C, 1.50 to 2.0 percent of Si, 1.0 to 1.5 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.005 percent of S, 0.025 to 0.070 percent of Als, 1.0 to 1.4 percent of Cr, 0.20 to 0.50 percent of Ni, 0.020 to 0.050 percent of Ti, 0.020 to 0.050 percent of Nb, 0.20 to 0.40 percent of Cu, 0.002-0.005% of B, and the balance of Fe and inevitable impurities. The tensile strength of the hot forming steel is larger than 1300 MPa, by adding Ni, Cu, Nb, titanium and other alloys and increasing the austenite content in the steel through the partitioning process in the quenching process, the hot forming steel has high extensibility and low hydrogen-induced delayed cracking sensitivity, the hot fo