Is it better to use quenching oil or quenching fluid during heat treatment?
July 18, 2022
Is it better to use quenching oil or quenching fluid for heat treatment?
Quenching oil and quenching liquid can be seen from the literal meaning that one is liquid and the other is oily. Quenching liquid is liquid quenching medium, which is developed from polyether polymer materials and various surfactants. Because of its inverse solubility in water, it solves the weakness of rapid cooling of water and easy cracking of workpieces; oil The cooling speed of the product is slow, the quenching effect is poor and it is flammable. It has been widely used in heat treatment. The quenching agent can effectively improve the working environment, improve the quenching quality of parts and reduce costs. It is a mature heat treatment quenching medium. The function of the quenching liquid is to ensure that the austenite can be cooled at a speed that exceeds the critical cooling rate, thereby obtaining a martensite structure and achieving the purpose of quenching.
Quenching oil is an industrial oil that is also used as a quenching medium. Quenching oil is mainly formulated with refined mineral oil as Base Oil, antioxidant, cooling agent, brightener and other additives. It has the characteristics of high flash point and high ignition point, and it also has excellent cooling characteristics to ensure that the parts after quenching have a certain hardness and qualified metallographic structure, which can prevent deformation and cracking of parts. There are many kinds of quenching oil: ordinary quenching oil, bright quenching oil, fast bright quenching oil, vacuum quenching oil, isothermal graded quenching oil, etc. It is suitable for quenching of small and medium-sized workpieces and various large-sized workpieces.
The cooling rate of quenching liquid is faster than that of oil, and the material with deviation in hardenability can have better hardness during quenching; quenching oil is suitable for materials with better hardenability. The selection of the heat treatment medium should also take into account the characteristics, stability, operability, economy and environmental protection of the quenching medium cooling. Among these requirements, the most critical is the cooling characteristics of the quenching medium. As for the selection of quenching liquid or quenching oil in the quenching process, it should be comprehensively considered according to the physical properties that the workpiece needs to be quenched.
