By comparison with quenching and tempering steels the non-quenched-tempered steels not only decrease production cost but also can avoid deformation of parts by heat treatment and decrease deviation of mechanical properties. The advance in ferrite-pearlite high toughness non-quenched-tempered steels
bainite and martensite non-quenched-tempered steels and current production and application of domestic non-quenched-tempered steel are presented.