To provide inexpensive reinforcing parts for collision with high energy absorption when bend-deformed at a high speed, which are manufactured with the use of an existing press and a nitrocarburizing facility and a surface-untreated steel sheet, without needing to increase the capacity of a currently-used press, add a new function thereto, and plate a material to be pressed with aluminum.
The reinforcing parts for collision with high energy absorption when bend-deformed at a high speed is a member made by pressing a steel sheet and then nitrocurburizing it. The workpiece has such a hardness distribution in the sheet thickness direction as to satisfy hardness in the central part of the sheet thickness: Hv≥160, hardness in the outermost layer: 600≤Hv≤1,200, and hardness in a position of 0.2 mm distant from the outer layer: Hv≥400.
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UJITA KATSUYA
YOSHIDA HIROSHI
Etsuichi Matsumoto