Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yoshimi Aoyama0
Makoto Takeishi0
Masahiro Kobessho0
Yasuyuki Fujiwara0
Katsumi Ichitani0
Date of Patent
August 9, 2011
0Patent Application Number
119124360
Date Filed
June 26, 2006
0Patent Primary Examiner
Patent abstract
The heat-treating oil composition of the present invention is characterized by comprising a mixed base oil containing a low-boiling base oil having a 5% distillation temperature of from 300 to 400° C. in an amount of not less than 5% by mass but less than 50% by mass, and a high-boiling base oil having a 5% distillation temperature of 500° C. or higher in an amount of more than 50% by mass but not more than 95% by mass. There is provided a quenching oil composition capable of exhibiting a less fluctuation in hardness or quenching distortion of a metal material treated therewith even when a large number of the metal materials are quenched therewith at the same time.
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