O1 quench

[KeithH]

I know this is a common thread, but what the heck.

I've heard often of quench oil grades, speed of quench, etc. What home quench works the best with O1 ? Some say cooking oils, motor oils, mineral oils and others mix up transmission fluid concoctions. Which is best for O1 and at what preheat temperature?

Thanks

 

[KeithH]

and how long does it need to be tempered for?

Thanks again

 

[Onies]

KeithH,

I typically use hydraulic oil heated to 140 deg F and never had a problem. I heat to non magnetic and let air cool, heat to non magnetic again and let cool to cherry red (3X) then heat to non magnetic and quench. A 2 hour tempering cycle at 400 deg F followed by an overnight soak in dry ice. After the dry ice, 2 more 2 hour tempering cycles at 400 deg F.


Fred

 

[KeithH]

thanks Onies, but one dumb question, is dry ice solid? I'm guessing that the dry ice is used as an oxygen free environment. Ill have to give it a try. But what to use as a heat source hmm. P.S welcome to the forum, Fred