Keywords: fog, quenching, fog quenching tank, quenching tank, atomization, nozzle, heat treatment, cooling, fog hardening tank, fog hardening,

fog quenching tank

　　The fog quenching tank is a kind of fog quenching tank. The fog structure is similar to the fog quenching tank, but the difference is that the nozzle changes from water flow to atomizing nozzle. Using an air compressor, compressed air is blown onto a water (liquid) stream at a certain angle through a nozzle, causing the liquid stream to break and form a mist like medium mixed with gas for fog quenching.

　　fog quenching tank,quenching tank,fog quenching tank,cooling tank,fog hardening tank is a kind of quenching tank used in the field of metal heat treatment. It is used to place austenitized steel or steel parts in the aerosol medium formed by mixing water and air for rapid cooling. This technology is included in the "National Standard of the People's Republic of China for Metal Heat Treatment Terminology Quenching" (released in 2023), as an important branch of the quenching cooling method system, forming a complementary relationship with processes such as fog quenching and air-cooled quenching.

　　According to the national standard issued in 2023, fog quenching specifically refers to the process of cooling steel or steel parts in the mist medium formed by water and air mixed fog after austenitizing. The physical principle is to achieve the transformation of material structure by adjusting the gas-liquid mixture ratio and precisely controlling the cooling rate.

fog quenching tank,quenching tank,fog quenching tank,cooling tank,fog hardening tank

　　Technical features of fog quenching tank

　　The cooling medium is composed of compressed air mixed with water mist to form aerosols

　　The cooling rate is between single medium quenching and air-cooled quenching

　　Gradient cooling can be achieved by adjusting atomization parameters such as air pressure and water volume

　　Application scope of fog quenching tank

　　This process is suitable for the following processing scenarios:

　　Surface Strengthening Treatment of Medium Carbon Steel and Alloy Structural Steel

　　Selective cooling during local quenching of large workpieces

　　Precision machining of parts with high requirements for controlling workpiece deformation

　　Technological advantages of fog quenching tank

　　Compared with the traditional quenching method, fog quenching has three major technical advantages:

　　Reducing the risk of quenching cracking: slowing down quenching stress through atomized media

　　Improve dimensional stability: uniform mist distribution reduces thermal deformation

　　Stronger environmental adaptability: reduces pollutant emissions compared to traditional oil quenching

　　The standard document specifically points out that there are essential differences between fog quenching and fog quenching: the former medium is gas-liquid two-phase flow, and the latter is pure liquid fog cooling. This process difference directly leads to a significant comparison in technical parameters such as cooling intensity and applicable material range between the two.

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