(Received 21 November 2013; accepted 11 April 2014)
Published Online: 2014
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Cooling curve tests have been the most useful means of testing the cooling power of liquid quenchants such as oils and polymer quenchants. The JIS method for evaluating the cooling power of oils (JIS K 2242) was established in 1965. A cylindrical silver probe was adopted for the JIS method because of the following advantages: measurement results will not be affected by phase transformations or surface oxidation, and the probe has high sensitivity and excellent reproducibility. In the JIS method, 80°C di-2-ethylhexyl phthalate (DOP) is used as a reference quenching fluid for initial calibration and for periodic calibration checks of the probe and the overall system. However, it has been pointed out that DOP may be an environmental pollutant. Therefore, the JIS Technical Committee on heat treating fluids looked at new reference quenching fluids that could replace DOP. Through a series of round-robin tests, mineral oil having a flash point within a prescribed range and a viscosity of ISO VG22 was selected as the new reference quenching fluid. This mineral oil is specified as the reference quenching fluid in the revised standard for heat treating fluids, JIS K 2242:2012.
Secretary of the JIS Technical Committee on Heat Treating Fluids, JX Nippon Oil & Energy Corporation, Yokohama, Kanagawa
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