| abstract |
The invention provides a heat-treated oil composition, which can suppress the decrease in the brightness of metal materials during heat treatment, and at the same time can suppress the increase in the number of seconds (characteristic seconds) until the end temperature of the vapor film stage and the dynamic viscosity with time. reduce.nn n n A heat-treating oil composition comprising: (A) a base oil; and (B) a vapor film breaking agent, which are selected from one or more of petroleum resin, terpene resin, rosin, and derivatives thereof. |