Idemitsu Kosan Company, Limited

Toyota Jidosha Kabushiki Kaisha

Masahiro Kobessho

Katsumi Ichitani

Masahiro Yamada

Yasuyuki Fujiwara

Shinji Aoki

Kenro Noguchi

Makoto Takeishi

Keizo Murata

Yoshimi Aoyama

Komei Matsumoto

Masayuki Kato

Norihiro Takasaki

Yasuyuki c/o Toyota Jidosha Kabushiki Fujiwara

Yoshimi c/o Toyota Jidosha Kabushiki Aoyama

Provided are a pressure medium oil, containing a Group-14 element-containing organic compound selected from an organic germanium compound, an organic tin compound, and an organic lead compound, and a method for using a pressure medium oil, which includes applying a pressure to a substance via the pressure medium oil. The pressure medium oil does not solidify even under an ultrahigh pressure of more than 3.7 GPa at room temperature (25&#xb0; C.) and has a low pour point, and hardly dissolves a conductive paste.

Pressure medium oil and method for using said pressure medium oil

A heat-treatment oil composition contains (A) a first base oil with a kinematic viscosity at 40 degrees C. in a range of 5 mm/s to 60 mm/s in an amount of 50 mass % to 95 mass % of a total amount of the composition, (B) a second base oil with a kinematic viscosity at 40 degrees C. of 300 mm/s or more in an amount of 5 mass % to 50 mass %, and (C) an alpha-olefin copolymer. The heat-treatment oil composition according to the invention can reduce distortion unevenness and hardness unevenness accompanying mass-quenching.

Heat treating oil composition

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&#xb0; 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&#xb0; 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.

Heat treatment oil composition

The present invention is directed to a metal working oil composition comprising the following components (A), (B), and (C), and optionally (D):

Metal working oil composition

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Ichihara, Japan

Masahiro Kobessho