Quenching in 90 weight motor oil

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Texas Knife Maker, Jan 2, 2019.

  1. Texas Knife Maker

    Texas Knife Maker

    Jan 2, 2019
    Fairly new to quenching. I have a lot of very lightly used 90 weight motor oil. Is there any reason I shouldn't be using it to quench my blades? Besides the stench at least.
  2. Drew Riley

    Drew Riley Riley Knife and Tool Knifemaker / Craftsman / Service Provider

    Oct 17, 2007
    What kind of steel? It will likely harden your blades some, but there are much better options in engineered quenchants these days, and while they seem pricey, they do a much better job and last a very long time...

    If I recall, Maxim Oil is based out of Texas, and they'll be able to get you exactly what you need at a very reasonable price.
    12345678910 likes this.
  3. 12345678910


    Jul 13, 2009
    90 weight is tremendously thick

    I agree, Maxim oil in Texas sells Parks oil

    Parks 50 for Fast oil like 1095, W1, W2,

    Parks AAA for slower oil like O1

    brand new cheap clean canola oil is available in every grocery store- but not much cheaper than Parks - especially if you pay no shipping
    Last edited: Jan 3, 2019
    Justin Schmidt likes this.
  4. mete


    Jun 10, 2003
    Isn't 90-EP the hypoid lube ? that would be far too thick for quenching .
  5. Nathan the Machinist

    Nathan the Machinist KnifeMaker / Machinist / Evil Genius Moderator Knifemaker / Craftsman / Service Provider

    Feb 13, 2007
    Quench oils tend to be very thin, thick oil doesn't circulate well during the quench.
    Justin Schmidt likes this.
  6. Natlek


    Jun 9, 2015
    @Nathan , which carbon steel is best candidate to test all this oils ? Oils like canola , transformer oil , used engine synthetic and minerali oil , different hydraulic oil , hypoid oil ...etc ?I have them all here for free so I would like to make test with all that oil .....
  7. Nathan the Machinist

    Nathan the Machinist KnifeMaker / Machinist / Evil Genius Moderator Knifemaker / Craftsman / Service Provider

    Feb 13, 2007
    I wouldn't quench in transformer oil. Some of it was pretty toxic.

    The best quench oil will be thin and clean without EP additives or other stuff that will char and stick to the blade. Canola oil is pretty good. Engine oil is terrible. Hydraulic fluid should work okay for some slower steels though I expect it will catch on fire.

    Personally, I stick to regular quench oils designed for the purpose. No need complicating something so simple as an oil quench with unknown variables.
  8. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    If I was running a comparison test for backyard HT with found oils, I would use 1084 as the test material.

    As Nathan said, I would not list or test "transformer" oil. I would test mineral oil.
    Natlek likes this.
  9. Natlek


    Jun 9, 2015
    I have right quench oils / slowly I will complete all equipment / but just from curiosity I would like to try one steel in all that different oil and see result. Only my friend would not be happy when he see me in his shop playing with his expensive Rockwell tester .....again :) Don t worry about hazard , I survived 20 years oil vapors and breathing asbestos in my service.....one more time no problem :)
    80Crv2 ? 15N20 or 52100 ?
  10. daizee

    daizee KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Dec 30, 2009
    Canola has a nice high flash point. Non-toxic. Perfect for 1084.

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