The practice of using large open tanks filled with oil for heat treatment can be consigned to history thanks to the development of new technology. Today Feroquench 2000, a water-based polymer quenchant, is widely used to replace open oil quench tanks and this trend is accelerating. Comprehensive practical experience is now available to prove that a water-based polymer quenchant with oil-like quenching properties is capable of providing excellent performance over many years of service. In many cases the conversion of an oil-quenching system is straightforward, although high water containing quenchants always require good agitation due to the lower boiling temperature of these fluids compared with oil. The quenching properties of water-based polymer quenchants are much more influenced by the bath-temperature than those of oils. Therefore the temperature has to be controlled to reach constant and homogenous cooling properties. The paper details properties of water-based quenchants together with application parameters and examples of working systems.
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