Keywords: PAG, quenching fluid, quenching, quenching tank, quenching volume, quenching medium, heat treatment,

PAG quenching fluid whole quenching tank replacement problem
　　Due to use and pollution, the change of PAG quenching fluid will never stop. Therefore, no matter how to use and maintenance, it is necessary to do the whole quenching tank replacement. The quenching volume is large, the management and maintenance are poor, and the life of the quenching liquid is short. On the contrary, the quenching amount is small, or the management and maintenance are good, the life is long. Foreign factories using PAG quenching medium, in order to ensure the stable quality of heat treatment workpieces, have stipulated the time for the replacement of the whole tank according to their own use characteristics. Most factories are about one year, and the length is several years.

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