Kobe Steel, Ltd.

Junkiti Kobayashi

Ichiro Kokubo

Kensaburo Takisawa

Yuuji Koyama

Seiji Ban

Chosei Ueda

A thin rolled steel plate, and method and apparatus for producing it is disclosed. The thin rolled steel plate is formed with a drum shape in cross-section with a thickness ratio of a central portion to the edge portions of at least 1.1. The rolled steel plate is rolled having a concave drum shape during the rough rolling step and/or the first half of the hot finishing rolling step so as to achieve the desired drum shape. The plate is subsequently rolled in the second half of the hot finishing rolling step and the cold finishing rolling step by concave drum shaped rollers which reduce its thickness while not altering its drum shape.

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Kakogawa, Japan

Junkiti Kobayashi