This paper reviews the previous literature on alloy composition design of low-density steel (LDS), focusing effect Al, Mn, Ni, and other elements formation matrix second phase, provides classification. The microstructure LDS after processing includes structure, к-carbide, B2 (FeAl, NiAl, or MnAl) phase ferritic LDS, austenitic dual-phase LDS. influence corrosion resistance is derived from addit...