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In search for thinner auto-body panels, investigation has been made on the level of yield strength of high strength steel sheets in view of the fact that the dent resistance must be at least equal to that of today's mild steel panels. Dent resistance should be evaluated for slight dent, and loss of the dent resistance caused by thinning is most remarkably seen in this case. Rephosphorized aluminum killed steel with bake-hardenability is most favourable, taking the necessary resistance to slight dent and the formability into consideration.