Developing lightweight and high-strength steel for the automotive industry is particularly important due to reduced fuel efficiency and maintaining or improving passenger safety. The effects of Al content and solution treatment on microstructure, tensile properties, and corrosion resistance of Fe–Mn–Al–C low density steel were analyzed. The results show that the addition of Al reduces the density of steel, and in the low-density steel of Fe–Mn–Al–C, with the increase of Al content, the microstructure of low-density steel is refined, and the strain hardening rate is significantly improved, and the corrosion resistance of the material is enhanced. After the solution treatment of Fe-28Mn–10Al–C steel, the grain growth occurred obviously, and the tensile strength decreased from 1038 MPa to 826 MPa, but the elongation increased from 42.9 to 62.9%. The strong plastic product of low density steel reached 51.95 GPa %, and the solution treatment enhanced the corrosion resistance of Fe–28Mn–10Al–C steel.
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