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Need corrosion resistant hardened shaft.

I have a requirement for an 8 mm shaft with a Rockwell C of 58 or better due to the use of a roller clutch bearing. However, I need it to also be corrosion resistant in high temp and humid environments. We currently use precision shafting made from case hardened 1050 steel, but it is rusting too easily (after 2 days in 90 deg/75% RH). I've considered 440C stainless, but I do not believe it can be brought up to that hardness. Is there a another type of finish that I could use on plain steel (or alloy) to ensure it won't rust. I read somewhere that Salt bath carburizing could do it but I don't know much about it.
Thanks for the help.

David Seebauer
product designer - Watertown, Connecticut, USA
June 22, 2009

Hi, David. We have an article on line here about salt bath nitriding that should answer your questions: "The Kolene® QPQ(SM) Process". Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
June 23, 2009

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