JPS561204A - Manufacture of rolled thick plate - Google Patents

Abstract

PURPOSE: To obtain the rolled product of flat shape with less amount of defective part to be cropped, by forecasting the flat shape of the final product of the thick plate rolling process, and by carrying out the final pass of the cast billet rolling process with the vertical roll for reducing the breadth.

CONSTITUTION: The flat shape of the rolled product of thick plate to be obtained finally is forecast. In order to obtain the rolled product of rectangular flat shape by this pass schedule, the previous rolling process for the continuously cast billet is carried out by the vertical roll mill by continuously changing the rolling reduction in the breadth direction for every length to be cut from the billet correspondingly to the product thick plate. Next to this, the billet is cut into the length corresponding to the product thick plate and the slab for the thick plate is obtained. For example, if the shape of final rolled product is forecast to be a shape with swelling side edges, the rolling work is carried out by employing the bobbin type slab as the starting material. Hereby, the final product thick plate with less amount of anomalous part can be manufactured.

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