The quenching medium of polyurethane heat preservation pipe can be quenched by water based single medium or martensite isothermal step quenching oil. The polymer water-soluble quenching agent should be selected reasonably according to the hardenability of steel, the quality of the workpiece, the shape and the technical performance of the workpiece. Martensite isothermal graded quenching oil is suitable for quenching and cooling of medium and high hardenability large-bore polyurethane insulation pipes, and can be used for quenching and cooling of open groove, closed groove or sealed box furnace.

　　Generally, the structure and performance of large-diameter polyurethane insulation pipe after heat treatment are mainly determined by the quenching and cooling of large-diameter polyurethane insulation pipe. With the development of low carbon economy, the quenching and cooling of polyurethane insulation pipe is paid more and more attention when energy saving and emission reduction are advocated and green heat treatment is developed. Quench oil and water - based quench agent are commonly used as quench media for large diameter polyurethane insulation pipe.

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