Crystallizer, or inner portion, of a mold for the continuous curved casting of thin slabs

A crystallizer of a mold for the continuous curved casting of thin slabs lengthwise through the crystallizer, comprising an outer curved extrados plate spaced from an inner curved intrados plate defining a casting channel therebetween, wherein at least the outer curved extrados plate contains a substantially central enlargement hollow starting from an upper surface of the outer curved extrados plate and being reduced progressively to zero at a lengthwise intermediate position along the curved inner surface of the outer curved extrados plate, and a funnel-type flaring cooperating with the enlargement hollow, the enlargement hollow being defined by a profile determined lengthwise by an angle ".alpha." and crosswise by an angle ".beta.", wherein the angle ".alpha." should not exceed a maximum value of 5.degree. and may vary, from a center line to the sides of the hollow, according to a substantially linear development contained within a field limited at its upper end by that maximum value and at its lower end by zero, and wherein the angle ".beta." should not exceed a maximum value of 4.5.degree. and may vary, from the upper surface of the crystallizer to the lower end of the hollow, according to a linear development contained within a field limited at its upper end by that maximum value and at its lower end by zero.