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How hot do self cleaning ovens get?

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Bufford, Feb 19, 2007.

  1. Bufford

    Bufford Gold Member Gold Member

    Mar 13, 2006
    I've been wondering how hot those self cleaning ovens get. My friend claims they will get up to 2000 F . If so it could be used for heat treating large blades that won't fit into my Paragon.

    I do have my doubts that the ovens get quite that hot, otherwise the metal parts like oven racks would oxidize. Perhaps some of you know something about them.
     
  2. 724wd

    724wd

    435
    Dec 29, 2006
    i think 500 would be the upper limit. 2000, well, i just dont see that happening!

    heath
     
  3. Barkes Knife Shop

    Barkes Knife Shop

    Jan 2, 2006
    Safe your money and get a Heat Treat Oven. You will be happy you did. The one in my shop will go up to 2300. Hope this was of help to you. Have a great day in the shop.

    Barkes
    http://my.hsonline.net/wizard/knifeshop.htm
    :thumbup:
     
  4. jlmetcalf

    jlmetcalf

    75
    Jul 5, 2005
    Most cleaning cycles go to 800-900F. Never seen one that got hot enough to turn the racks red-hot.
     
  5. mete

    mete Gold Member Gold Member

    Jun 10, 2003
    Somewhere around 800 F !![the temperature that real pizzas are cooked !!! ] 2000 F would cause more than a few problems like melting copper wires etc !!
     
  6. novaflare

    novaflare

    348
    Dec 14, 2000
    800 to 1200 degrees depending on the oven. The big profesional ovens that have self clean hit the 1200 degree mark. Private ovens like kenmores etc hit between 800 and 900 degreens. Ive seen ones with windows in the front in pro line where the racks do turn a nice glowing orange color during the cycle. Considering you can heat treat in a oven at 450 f for 1 hour x 2 cycles id say a self clean cycle would really put the heat to it. Remember heat treating is not tempering infact it remove some temper from the blade. I always thought the HT and tempering were the same till i read the tutorial here
    http://hossom.com/tutorial/jonesy/ Ive been useing the various tutorials posted here and been getting nice results. Hats off to those who wrote the various linked tutorials.
     
  7. Barkes Knife Shop

    Barkes Knife Shop

    Jan 2, 2006
    I heat treat around 1500 and Temper around 350 to 400

    Barkes
    http://my.hsonline.net/wizard/knifeshop.htm
    :)
     
  8. Stacy E. Apelt - Bladesmith

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

    Aug 20, 2004
    Novaflare - I thing you read that backward. Tempering removes some of the hardness from the blade after the quench (which is improperly called HT by many)

    HT is the generic term for the entire hardening/tempering precess. It may consist of many steps. Normalizing/stress reduction,hardening /quenching,tempering, cryo. Each step makes a change to the structure of the steel.
    For simple steels (non-stainless):
    Stress reduction is done in the 1200-1400 range
    Quenching temperatures are in the 1350-1500 range
    Tempering is in the 350-550 range
    and Cryo is in the -100 to -300 range

    A home oven gets ,maybe ,800 during self clean. It is an uncontrolled heating cycle and could not be relied on.
    Home ovens are fine for tempering, as the temperatures hold fairly steady in the 350-500 range on a good oven (and the exact tempering temperature is not as critical as the quenching temp. You should use a good pyrometer or oven thermometer in the oven when tempering,though, since ovens can vary as much as 50 degrees during a heat cycle.

    Stacy
     
  9. jdm61

    jdm61 itinerant metal pounder Knifemaker / Craftsman / Service Provider

    Aug 12, 2005
    Good point, Stacy. I use my new oven for tempering and found that it swings about 25-30 degrees from the time the coils kick on til they shut off.
     
  10. 724wd

    724wd

    435
    Dec 29, 2006
    i told you i was might be wrong! dangit, that makes twice! =)
     

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