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vegetable oils for tempering

J

John Frankl

Joined
Oct 16, 2001
Messages
1,917
I basically only use commercial heat treating oils for quenching/hardening my blades. But many have recommended peanut oil for marquenching and tempering due to its high flash point. I would like to try both oil and salt for tempering, and possible martempering. Unfortunately, it is not readily available here in Korea. OTOH, soy oil is everywhere and cheap.

I recently came across this site:

http://neurotalk.psychcentral.com/showthread.php?t=2046

It lists the "smoke points" of many readily available vegetable oils, and it seems soy outdoes peanut.

Any comments?

John
 
I say get some and give it a shot! Do you have any place you can get a rockwell test done? If so, quench in one of your ordinary oils and quench in the soy oil and compare them.

I'm interested in the results.

-d
 
I wonder if Brownells will ship overseas. They have a Nitre Blue salt that is great for that. I havent tried oils at that high temp but would be very worried about flash fire.
 
Bruce,

Thanks. I actually can get Houghton products over here, and have some low-temp salts. DrawTemp 270 is the Korean name and it refers to the working range (somewhat below and above 270 degrees Celcius).

I guess I'm just interested in the oil as well, although I certainly agree with your concerns.

John
 
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