CPC B21D 22/022 (2013.01) [B21D 22/22 (2013.01); B21D 22/26 (2013.01); B21D 53/88 (2013.01); B60J 5/04 (2013.01); B60J 5/0413 (2013.01); B21D 22/06 (2013.01)] | 9 Claims |
1. A panel-shaped formed product made of a steel sheet having a quenched martensitic structure and a tensile strength of not less than 1200 MPa, comprising:
a polygonal top panel portion,
an opening portion provided in the top panel portion, and
a vertical wall portion extending from at least two adjacent borders among borders of the top panel portion, wherein
at least one pair of each vertical wall portion of pairs of adjacent vertical wall portions among the vertical wall portions has a step portion, and a height of the vertical wall portion with the step portion is 40 mm or more.
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