Cryogenic treatment can be done on tools coated with TiN, TiCN, TiAIN, and TiAICN

The Cryogenic Institute of New England offers custom based cryogenic treatment for tools used in manufacturing industry

Even though coatings such as TiN, TiCN, TiAIN, and TiAICN are already widely used and relatively inexpensive; cryogenic treatment should be kept in mind. Cryogenic treatment can used on tools that have already been coated without causing any problems. Coatings will help keep the tooling sharp and increase wear resistance as will cryogenic treatment.

Source:http://www.cnczone.com/modules.php?name=News&file=showarticle&threadid=82275