Fe-Mn-Al-C series light steel with high product of strength and elongation and ablation resistance and preparation method of Fe-Mn-Al-C series light steel

The invention discloses Fe-Mn-Al-C series light steel with high product of strength and elongation and ablation resistance and a preparation method of the Fe-Mn-Al-C series light steel. 8.0 to 10.0 wt% of Al; 0.9 to 1.2 wt% of C; 2.5 to 3.5 wt% of Ni; 0.5-0.8 wt% of Cr, and the balance being Fe. Al and C elements with high mass percent are added into the light steel, so that a nano-scale kappa carbide is generated through amplitude modulation decomposition in the aging treatment process of an alloy, the nano-scale kappa carbide and austenite are kept in a highly coherent relationship, the strength and plasticity of the alloy are improved, Ni and Fe are subjected to infinite solid solution by adding Ni and Cr elements, the Ni element can enlarge an austenite phase region, and the strength and plasticity of the alloy are improved. Cr and Fe are elements for forming and stabilizing austenite, and Cr and Fe can also form a continuous solid solution to reduce an austenite phase region, so that the properties of hi