Koda and Androlia
Method of levelling two-layered clad metal sheet
 A method for preventing the camber of a two-layered clad metal sheet having a base layer and a covering layer of different metals which exhibit different amounts of thermal contraction. The method comprises developing a temperature difference .DELTA. T expressed by the following formula between the base layer and the covering layer during a hot levelling, by providing a greater cooling effect before or during levelling to the layer which exhibits the greater thermal contraction than to the layer which exhibits the smaller thermal contraction: EQU .DELTA.T=f (.DELTA..alpha., .alpha., a, To) where, PA1 .DELTA..alpha.: the difference in thermal expansion coefficient between both metals PA1 a: the clad ratio (ratio of covering layer thickness to total sheet thickness) PA1 To: hot leveller inlet temperature (.degree.C.) PA1 .alpha.: mean thermal expansion coefficient of both metals. Since the layer which exhibits a greater thermal contraction is forcibly cooled before or during a hot levelling adequately and by a required amount, the clad metal sheet does not exhibit any substantial camber after cooled down to the room temperature. 
Kawasaki Steel Corporation
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B21B B21D C21D B21B
inventional inventional inventional additional
Michio Shuji Hideo Tsuneo Hideki Hiroshi Toru Norio
Yamashita Watanabe Abe Nagamine Watanabe Yoshida Sasaki Takashima