| abstract |
The present invention provides a heat-treating oil composition which can maintain the same degree of cooling performance as the two types of No. 1 oil of JIS K2242:2012, and can reduce the cooling performance of each part during quenching, when the metal material is heat-treated by quenching or the like. The unevenness can also suppress the temporal change of the cooling performance which occurs when the heat treatment is repeatedly performed.nA heat treatment oil composition comprising: (A) a base oil; and (B) one or more selected from the group consisting of petroleum resins and/or petroleum resin derivatives. And the characteristic time of the heat treatment oil composition obtained from the cooling curve is less than 1.00 second, and the cooling time of the cooling curve from 800 ° C to 300 ° C, that is, the 300 ° C seconds is less than 6.00 seconds and less than 14.50 seconds, wherein This cooling curve was obtained in accordance with the cooling performance test method of JIS K2242:2012, Japan. |