HEAT TREATMENT OIL
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United States of America Patent
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Issued Date -
May 30, 2024
app pub date -
Mar 29, 2022
filing date -
Mar 31, 2021
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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.
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