Cristallizzatore per colata continua

A crystallizer for continuous casting comprising a tubular body (11) defining a longitudinal axis and having at least one wall (12) that defines a longitudinal through casting cavity (13), a plurality of longitudinal grooves (14) obtained at least on a portion of an outer surface of said at least one wall (12) and open towards the outside thereof, said plurality of longitudinal grooves (14) defining a corresponding plurality of longitudinal fins (16) on the tubular body (11), one or more layers of fiber composite material arranged in direct contact with the outer surface of said at least one wall (12) so as to close said longitudinal grooves (14) making corresponding longitudinal cooling channels (17) for the flowing of a cooling liquid, wherein said longitudinal grooves (14) cover at least 70% of said outer surface, and wherein the width of the longitudinal grooves (14) is greater than the width of the longitudinal fins.