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I Forge Iron

heat treating oil

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I use "store brand" vegetable oil.

Some use automatic transmission fluid.

Veg oil smells like a fish-fry. Tranny fluid smells like... well, a burnt transmission.

If your talking about blades, I always pre-heat the oil before quenching.


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Jim, where abouts in the world are you? Certainly here in teh UK it's not that easy to get hold of compared to the US (at least that's the impression I get). Before I found a supply of commercial HT oil I used peanut oil with very good results (though it depnds on the speed of quench that you are aftr ;) )

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