(57) © in a method of hot rolling a metal slab in order to increase its width, a pair
of opposite faces of the slab are hot rolled to produce a groove in each of the faces
but the lateral edges of the faces are not rolled and, thereafter, the slab is passed
between a pair of cylindrical rolls in order to reduce the slab to uniform thickness.
Preferably, an additional step is included in which the initially formed grooves are
widened by additional rolling before the thickness of the slab is reduced to a uniform
value.
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