1.      Ordinary quenching oil quenching (oil temperature at 60 ℃)
Ordinary quenching oil is mainly applied to the harden ability better ferroalloy, such as small size bearing steel, tool and die steel Quenching. Past domestic only different brands of machine oil as a quenching oil. In the early 1980s, in order to improve the cooling performance of the oil, thermal oxidation stability and rust-proof performance, mechanical oil added reminder of cold agents, antioxidants and rust inhibitors, developed different grades of ordinary quenching oil its performance is better than machine oil.
Ordinary quenching oil can be used in a salt bath furnace, box furnace, pit furnace; the general process quenching should not be mixed with other oil products. Oil change is to thoroughly clean the tank. Best use of the oil temperature is 50 ℃ ~ 80 ℃, the maximum temperature does not exceed 80 ° C, so as not to affect the service life. Cycle mixing oil installations should install in the tank to further enhance the cooling capacity of the oil, so that the work piece surface can be uniformly cooled, and shall report regularly to add new oil in the tank.

2. Bright quenching oil (oil temperature quenching at 70 ℃)
Bright quenching oil parts quenched in a controlled atmosphere heating a cooling medium, the main feature is the bright surface after quenching part, the main treatment after quenching is no longer a small part of the secondary processing, such as precision instrument parts, watches and small amount of cutting tool parts. Bright quenching oil in addition to meet the requirements of the cooling performance, can prevent the oxidation product of the formation of large micelles adhere to the surface of the parts has been attached to the surface of the part insoluble products and replacement down to ensure that the surface of quenched parts bright.
Bright quenching oil as a cooling medium can be used in small cross-section of bearing steel, tool and die steel, cutting tool steel instrumentation parts quenching, can also be used forlorn-protective atmosphere quenching furnace processing the harden ability good steel in a protective atmosphere furnace quenching . The oil temperature at 60 ℃ ~ 80 ℃ as well. Mustuse to control the moisture content, moisture content greater than 200 μg / g, the brightness of a sharp decline in quenching oil must be processed, or seriously affect the quality of parts quenched.
 



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