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Tool Time Let's talk shop. Equipment, Tips & Tricks, Safety issues - Post it here.

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  #1  
Old 01-01-2005, 01:35 PM
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McAhron McAhron is offline
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High temp oil?

I would like to build a high temp oil tank for doing bainite transformations and other things. I dont wish to use salts do to their corrosive nature and danger level. What would be the best oils to use? As for the tank, would a 6" diameter pipe 3 feet long verticaly with heating elements wrapped around the sides and then covered in kaowool controlled by a thermostat work for this application? Are ther any plans available for making such a tank? The oil temp would be a maximum of 500 degrees.All help would be much appreciated. Thanks. McAhron


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Old 01-01-2005, 02:07 PM
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I cannot think of an oil that has a flash point above 500F. Isn't that why salts are used? It seems to me salts are lots safer to use. As long as you keep moisture out of the salt, and properly preheat to dirve off any accumulated moisture, it is the way to go, IMO.

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Old 01-01-2005, 03:16 PM
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Chuck Burrows Chuck Burrows is offline
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FWIW - Peanut Oil:
Physical Analysis:
*smoke point (F) .......450
*flash point (F) ..........620
*fire point (F) ............670
*melt point (F) ............28


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Old 01-01-2005, 04:53 PM
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Chuck,
I see it has a high flash point, but a 450deg smoke temp. I'd say it's not going to be usable at 500, is it. Unless you like smoking oil for hours...

Howie
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Old 01-01-2005, 10:30 PM
Dementia Dementia is offline
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Im kind of in the same boat.
I have been researching some info about going down this road for my own HT'ing.

I was speaking to a chemical technician (or something like that, i never remember his actual title thingy) and after several hours of debate and suggestion it always came out to several different types of salt.

some of the salts that were suggested were enough to immediately invoke a responce ..
and though i wouldnt dare to call salt tanks 'safe' ... the salt seems to be the most predictable way to achieve this sort of thing.

having said that - this is just what i have found out from people over here .. and im still researching as yet.
let us know if you try the oil idea out and how it goes.

D.
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Old 01-02-2005, 12:47 AM
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I have found several different suppliers of flourinated oils with ratings of 800 degrees wich is more than enough for my needs.Thank you Chuck for the peanut oil suggestion, i am no longer pursuing bainite but may still build a high temp oil rig for blueing and coloring steel.Thanks


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Last edited by McAhron; 01-02-2005 at 01:32 AM.
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Old 01-02-2005, 02:04 AM
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Would a fluidized Alumina (AO/sand) bath work for tempering, or is there not a fast enough heat transfer? I know you can run Alumina baths up to 1100C.

Howie
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Old 01-02-2005, 09:28 AM
Coutel Coutel is offline
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Has anyone tried pewter?...just an idea.


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Old 01-02-2005, 03:56 PM
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They used to temper gunlock springs in molten lead, so I s'pose you could do some research on the various alloy melt temps for pewter to find one that would work. To be honest, though, I'd think salt would be safer and/or easier to use. "Safe" being a relative term for any liquid at 600 degrees, of course!
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Old 01-02-2005, 04:19 PM
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Thinking about it....maybe pewter would be unable to cool the steel quick enough to quench .....


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