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US 2024/0174936 A1Published application
Heat treatment oil
AssigneeIdemitsu Kosan Co., Ltd.
InventorMasashi NAKAMURA
Life of this patent
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Abstract
A quench oil may be excellent in thermal stability and may be capable of retaining the brightness for a prolonged period of time. Such a quench oil may contain a base oil containing a mineral oil (A), the mineral oil (A) having a 40° C. kinematic viscosity of 100 to 600 mm2/s and a sulfur content of 0.10 to 0.20% by mass, the base oil having a content of the mineral oil (A) of more than 0.5% by mass, based on the total amount of the base oil.
Claims7
A quench oil comprising a base oil containing a mineral oil (A),
- the mineral oil (A) having a 40° ° C. kinematic viscosity of 100 to 600 mm2/s and a sulfur content of 0.10 to 0.20% by mass,
- the base oil having a content of the mineral oil (A) of more than 0.5% by mass based on the total amount of the base oil.
Dependencies are inferred from the claim text.