GEzell Posted October 15, 2011 Share Posted October 15, 2011 I have some 12 year old canola oil that has had at least 50 blades quenched in it over the years... During that time I was focusing on 5160 as my primary steel, so I was not really concerned with my oil breaking down as 5160 will just about harden in a cool breeze. I edge-quench too, so this oil has been abused.... Just for the heck of it, I still quench in it on occasion when the steel doesn't need a fast quench. I have noticed something interesting. I had assumed as it aged and broke down that it would become slower and slower, however, just the opposite seems to have happened. I recently quenched a fairly long, wedge-shaped blade in it and got sori... not a nose dive as I would expect in oil, but the tip actually raised a bit. The last time I used it, the blade cracked in several places. I haven't cracked a blade in years, and then only in a brine or water quench. I think it has gotten faster, not slower. Is this typical as oil breaks down? Could it have absorbed enough moisture over the years that it now behaves more like a water quench than an oil quench? What are the effects on quench speed as oil ages? Note: I am now using parks50 for 1095/w2 and fresh canola for 1080 and 5160. But I am curious. George Ezell, bladesmith" How much useful knowledge is lost by the scattered forms in which it is ushered to the world! How many solitary students spend half their lives in making discoveries which had been perfected a century before their time, for want of a condensed exhibition of what is known."Buffonview some of my work RelicForge on facebook Link to comment Share on other sites More sharing options...
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