Do you know what types of cryogenic treatment？

Common cryogenic treatment practices include cryogenic deburring and cryogenic hardening.

Deburring is the process of removing sharp edges caused by machining, or flash that builds up when a part is cast or forged. In cryogenic deburring, a work piece is usually cooled with liquid nitrogen to cryogenic temperatures. The extreme cold renders burs and flash brittle, making them easy to remove by shot blasting or tumbling. Since they are soft and difficult to machine at room temperature, plastic and rubber parts are often cryogenically deburred, as well.

When a metal part is heat treated, a crystalline structure, called austenite, is transformed to a different shaped grain, called martensite. Since some standards require more martensite than is usually produced by heat treating, the transformation is often extended by cryogenic hardening, which is usually done at temperatures of -300°F (-185°C) and below. This type of cryogenic treatment causes a rapid change in the structure of the alloy, resulting in a higher percentage of martensite.

The music and electronics industries have also found ways to improve the quality of their products through cryogenic treatment. It is believed that cryogenically treating a brass instrument, such as a trumpet or saxophone, relieves residual stresses created during manufacturing, resulting in better overall vibration and improved intonation.