Description
Tempering oil is a cooling medium used in the tempering process of metal heat treatment.
Composition:
-Base oil: Mineral oil is usually used, such as paraffin-based mineral oil or naphthenic mineral oil, which has good lubricity and thermal stability.
Additives: including antioxidants, which are used to prevent oil products from oxidative deterioration at high temperature; Detergent dispersant to disperse impurities in oil and keep oil clean; Coolant, adjust the cooling speed of oil to meet the requirements of different metal materials and tempering process.
Performance characteristics:
-High flash point and ignition point: the flash point is generally above 200℃, and the ignition point is higher, which can avoid fire and combustion during high-temperature tempering and ensure safe operation.
-Appropriate viscosity: The viscosity is usually 40-100 mm/s (at 40℃), which can not only form a uniform oil film on the surface of the workpiece, but also ensure good fluidity and make heat transfer quickly.
-Good thermal stability: at tempering temperature (usually 150-650℃), it can maintain stable performance for a long time, and is not prone to cracking, polymerization and other reactions.
-Strong oxidation resistance: The added antioxidant can effectively inhibit the oxidation of oil products, prolong the service life and reduce the formation of sludge and carbon deposit.
-Adjustable cooling performance: By adjusting the additive formula, the cooling speed of tempering oil can be adapted to the requirements of different metal materials and tempering processes, and defects such as deformation and cracking of the workpiece due to too fast or too slow cooling can be avoided.
Scope of application:
It is mainly used for tempering of various metal products, such as molds, cutters and mechanical parts after quenching. Different types of tempering oil are suitable for different metal materials and tempering processes. For example, high alloy steel dies may need tempering oil with slow cooling rate to prevent excessive internal stress. Ordinary carbon steel parts can use tempering oil with relatively fast cooling rate.
Precautions for use:
When in use, the appropriate tempering oil should be selected according to the workpiece material and tempering process requirements. At the same time, the performance indexes of tempering oil, such as viscosity, acid value, flash point, etc., should be tested regularly. When the indexes exceed the specified range, new oil should be replaced or supplemented in time. In addition, the tempering oil should be kept clean to prevent impurities and moisture from mixing, which will affect the tempering effect and oil performance.