Abstract: A continuous casting mold for producing polygonal steel profiles by continuous casting by the curved-mold method, comprises individual plates defining the sides of the molds. The four plates are provided with recesses at their extremities which form abutting joint edges and the edges are held flush with one another by shims inserted between opposing surfaces of the plates at the corners thereof. One pair of plates is provided with radius or bevels so that the cross section of the interior of the mold is octogonal. According to the invention, moreover, the chamfered or bevelled surfaces and the surfaces between them are machined and a corresponding insertion shim is provided to insure that the edges are flush with one another.