Abstract: A continuous casting machine has an open ended flow-through mold surrounded by a plurality of spray nozzles connected in groups to segregated sources of water and air for dispensing the same individually or in combination. The spray nozzles are positioned to provide multiple zones of cooling. Each nozzle may include a mixing valve operated by a control which in turn is connected to an individual temperature sensor mounted on the surface of the mold in an opposed relation to each nozzle. The control establishes the flow rates of air and water at each nozzle in accordance with the individual temperature of that portion of the mold whose temperature is affected by the respective nozzle.