In this research we developed an induction heat treatment production technology to manufacture low carbon MnB steel for automobile door impact beam (DIB). After a sprayed water quenching and the induction heating treatment, the low carbon MnB steel has a well-developed martensitic structure exhibiting ultra-high tensile strength greater than 1470MPa and a good ductility more than 12% (GL=50mm). The induction heat treated low carbon MnB steel also has a good stable bending-absorption capability and a good delayed fracture resistance.