HEAT-TREATMENT OIL COMPOSITION
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Jan 14, 2021
app pub date -
Mar 26, 2019
filing date -
Mar 28, 2018
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A heat-treatment oil composition can make it possible to achieve both high quenching hardness and reduced quenching distortion. A heat-treatment oil composition may include a base oil (A) and a vapor film rupturing agent (B). The heat-treatment oil composition may make it such that, on a cooling curve obtained in accordance with the cooling performance test method in JIS K2242:2012, the time in seconds to 300° C., e.g., the cooling time from 800 to 300° C., is less than 6 seconds. Component (B) may include a petroleum resin.
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