Bumper beam of high strength steel comprising a hat profile (11-15) with a cover (10), characterized in that the bar has a central portion (22) with lower hat profile with respect to side portions (20, 21) and, unlike the side portions, this lower central portion (22) has a reinforcement in form folding edge (23, 24) on at least one of the side flanges (14, 15) of hat profile, said edge being folded away from the cover.
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