Inventors:
Brand Bronsema - Ionia MI
Jeffrey A. Anderson - Clarksville MI
John J. Kary - Bloomfield MI
International Classification:
C21D 802
Abstract:
A bumper beam for vehicles is formed from cold-rolled sheet steel having an initial tensile strength of approximately 70 ksi. The steel sheet is roll formed in a desired cross-section and swept into a curvature corresponding to the vehicle requirements before the steel sheet is heat treated by induction heat and quenched to provide a bumper beam having a tensile strength from 100 ksi up to approximately 260 ksi.