Subject: Re: Tool Steel - Quenching fluids

From: [email-masked]
Date: Wed, 10 Jul 1996 19:00:31 -0400

To All,
Used motor oil is only good for recycling.

Hochewa

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From: [email-masked]
Date: Thu, 11 Jul 1996 08:51:48 -0400

To All,
New motor oil was never designed to provide the proper cooling rates of a
quenching oil.Used motor oil is now full of additional stuff that only
further interfere with the action of quenching. True quenching oils came in a
multitude  of viscosities and compositions. Today's quenching fluids are
water soluble synthetics tailored very carefully to the end use. One
compound, depending on how much is added to water can provide a multitude of
cooling rates from near water to much slower. The synthetics were developed
because of health, safety and environmental issues. Cost wise this stuff is
not cheap but then neither is moter oil used or otherwise.
Industrial Heating is one of the commercial heat treating magazines that
should have adds in it for quenching fluids. 5 gallon quantities of the
concentrates are readily available. Get a bunch of guys together and invest.
Remember to dispose of used motor oils and the synthetic fluids properly.

Hochewa