Posted by RGMartin on February 21, 2013 at 17:01:13 from (22.214.171.124):
In Reply to: Cutting oil posted by Harvey 2 on February 21, 2013 at 16:38:03:
New oil has lots of carbon in it. Generally guys use used oil because they are cheap. That said, the carbon is already in the steel. Water works fine for a quench on high carbon steel, but since it cools the steel faster, it can make it brittle in some cases. You can heat and quench mild low carbon steel in any kind of oil you want and it doesn't harden.
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