How To Use Quenching Medium Correctly?
2023-12-11
Nowadays, the popularity of water-soluble quenching medium in domestic fastener companies is becoming wider and wider. In addition to low- and medium-carbon steel, products such as alloy steel, martensitic stainless steel, and hot work die steel are all trying to use water-soluble quenching Medium, and the experience of process control is becoming more and more mature, but there are often deviations in the control of the concentration of water-soluble quenching medium, leading to various heat treatment quality problems.
At present, the heat treatment quenching medium of domestic fastener enterprises mainly uses rapid quenching oil and water-soluble quenching medium. When they are in direct contact with high-temperature workpieces during use, changes in physical and chemical properties will inevitably occur, so the cooling performance will be affected during use. A certain degree of change needs to be effectively monitored. One is to improve the stability of the quenching medium to ensure that the performance and deformation of the quenched workpiece are within a controllable range; the other is to provide an effective cooling performance monitoring method, and at the same time "tailor-made" the quenching medium optimization plan according to the working conditions to ensure Long-term stable use of quenching medium.
Judging from the production practice of most fastener companies, rapid quenching oil is mainly used for alloy structural steel and thin-walled bolts, nuts and special-shaped parts; water is mainly used for carbon structural steel and simple-shaped fasteners ; PAG polymer quenching medium is between water and oil. Under certain conditions, it can replace water or oil, and has a wide cooling intensity range.
The polymer quenching medium can eliminate the oily smoke produced by the quenching oil. It is a global trend to reduce carbon emissions and promote the use of polymer quenching media. The polymer quenching medium can fully meet the requirements of safety production, and it can be confirmed that it is an important process material for the clean production of fastener heat treatment in my country.
At present, because of its unique advantages in environmental protection, technology and cost, polymer quenching media have been used more and more widely. In recent years, in order to reduce heat treatment oil fume emissions, my country has developed a variety of environmentally friendly and carbon-reducing new quenching media. The current use of polymer quenching medium accounts for about 30% to 40% of the entire quenching medium (oil + polymer quenching medium). In production practice, in order to improve the quality of quenching, the reproducibility of the use effect test of polymer quenching medium mainly depends on the reproducibility of stirring, which is actually a turbulent flow. The temperature, concentration and stirring of the polymer quenching medium are the key factors to ensure the quenching quality.
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