These are OEM steel, on my Superbeetle. The cryogenic tempering cost about as much as the raw part.
Quote:
https://www.thoughtco.com › cryogenic-hardening-2340006
Introduction to Cryogenic Hardening of Metal - ThoughtCo
Besides steel, cryogenic hardening is also used to treat cast iron, copper alloys, aluminum, and magnesium . The process can improve the wear life of these types of metal parts by factors of two to six. Cryogenic treatments were first commercialized in the mid-to-late 1960s.
|
__________________
.
.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
________________
.
.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
|