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I Forge Iron

Soybean oil to heat treat 4140

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I use canola oil on punches and small parts. I haven't needed to heat treat a big part yet. Other people use peanut oil or other vegetable oils so I am sure that soy will work fine. Generally speaking you want a gallon of oil per pound of steel, and you want the oil warm to start with, and a lid in case of flame. Soybean oil has a higher smoke point than peanut oil. (soy 495F, peanut 437F)


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