Keywords: Machine oil, heat treatment, quenching, HJ10, HJ20, HJ30, N15, N32, mechanical oil,

Machine oil
Mechanical oil is oil for mechanical products, which is essentially lubricating oil.
The old brands of mechanical oil for heat treatment and quenching are HJ10, HJ20, HJ30, etc. The number is determined according to the average value of kinematic viscosity (mm2/s) at 50 ℃, and the new standard is determined according to the average value of kinematic viscosity (mm2/s) at 40 ℃. N15, N32 and other brands of mechanical oil are commonly used for heat treatment. See Table for comparison of new and old grades.

Table of old and new names and viscosity grades of mechanical oils

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