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Heat Treating and Metallurgy Discussion of heat treatment and metallurgy in knife making.

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  #1  
Old 01-29-2012, 02:33 PM
darrell darrell is offline
 
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quenching agent

hello

has anyone used of heard of using about a 80%kerosine 20% motor oil as a quenching agent
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Old 01-29-2012, 02:52 PM
WBE WBE is offline
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IMO, a poor quench. You can do better.
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Old 01-29-2012, 06:14 PM
Doug Lester Doug Lester is offline
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Vegitable oils have a higher flash point than kerosene and motor oil often has things in it that you don't want to put into the air with a hot blade. I don't know how fast of a quenchant that mixture would be but the vegitable oil is pretty fast. If you need faster than that I would go with a commercial quenchant designed for shallow hardening steel or go to water or brine.

Doug


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Old 01-30-2012, 05:37 AM
Ed Tipton Ed Tipton is offline
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darrell...That mixture would probably work OK as far as hardening the steel goes, but would be very hazardous and explosive in it's nature. Placing a piece of 1500 degree steel into a pool of 80% kerosene is not my idea of a safe thing to be doing. Even ATF which is a common automotive fluid used as a quenchant, with a relatively high flash point, can be a problem if it catches on fire. With any oil quenchant, you need to be sure you have either a means of smothering the tank or extinguishing the fire should one develop.
Obviously, it is much safer quenching with water or brine when you have that option since neither present a fire hazard.
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