Crystallizer for continuous casting

A crystallizer for continuous casting comprising

• a tubular body defining a longitudinal axis X and having a wall with at least one inner face defining a longitudinal through casting cavity,
• a plurality of longitudinal grooves produced on at least a portion of an outer surface of said wall and open towards the outside thereof, a production of said plurality of longitudinal grooves defining a corresponding plurality of longitudinal fins on the tubular body,
• a covering winding made of composite material wound directly about the outer surface of said wall to close said longitudinal grooves forming corresponding longitudinal cooling channels adapted to make a cooling liquid flow therein,
• wherein a portion of the outer surface of said wall occupied by said longitudinal grooves and said longitudinal fins is at least 70% of said outer surface,
• characterized in that a width of the longitudinal grooves, which corresponds to a width of the longitudinal cooling channels, is greater than a width of the longitudinal fins.