| 摘要 |
A vehicular bumper beam according to an embodiment of the present invention is formed with an open cross section at one side by forming a bead on high strength steel at 980 MPa or higher tensile strength through elongation. The high strength steel according to the embodiment of the present invention contains Fe, C, Si, Mn, Al, P, S, and impurities. The tissue of the high strength steel according to the embodiment of the present invention includes one or more among ferrite, martensite, and austenite. The high strength steel according to the embodiment of the present invention is made of twinning induced plasticity (TWIP) steel at 1.6 mm or lower thickness with 45-65% of elongation percentage. The vehicular bumper beam according to the embodiment of the present invention forms the bead through a stamping process. |
