Here's what I did:
Quote:
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Originally Posted by DDG
Cryogenic hardening - Wikipedia
https://en.wikipedia.org/wiki/Cryogenic_hardening
Cryogenic hardening is a cryogenic treatment process where the material is cooled to approximately −185 °C (−301 °F), usually using liquid nitrogen.It can have a profound effect on the mechanical properties of certain steels, provided their composition and prior heat treatment are such that they retain some austenite at room temperature. |
It basically doubled the price of the raw parts, should get 3 to 4 times the service life.
edit: I went out to the carport and checked, they have some light scoring and discoloration (not rust) in eight years.