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Thread: Hardening Steel

  1. #1
    Join Date
    May 2007
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    Hardening Steel

    The latest (June 2010) KC Woodworkers Guild newsletter had an article about making your own tools and hardening the steel (page 2, cont. on page 4). It had an interesting fact I didn't know, but thought I'd share...

    "The simple test for knowing that the workpiece has reached its proper temperature for hardening is the steel will loose its magnetic property. Keeping a small magnet (with a large handle) handy lets you test the steel. When the magnet no longer sticks, the steel is ready for the quench."

    http://www.kcwoodworkersguild.org/Ne...newsletter.htm
    Darren

    To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault

  2. #2
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    Quote Originally Posted by Darren Wright View Post
    The latest (June 2010) KC Woodworkers Guild newsletter had an article about making your own tools and hardening the steel (page 2, cont. on page 4). It had an interesting fact I didn't know, but thought I'd share...

    "The simple test for knowing that the workpiece has reached its proper temperature for hardening is the steel will loose its magnetic property. Keeping a small magnet (with a large handle) handy lets you test the steel. When the magnet no longer sticks, the steel is ready for the quench."

    http://www.kcwoodworkersguild.org/Ne...newsletter.htm
    Darren, that is only half the process. After that hardening you must temper or your steel will be highly susceptible to shattering. I destroyed an antique knife blade by not knowing that. I accidentally tapped the hardened blade against a vice and it shattered like glass. There are different techniques. Re heating then burying in ashes overnight is one way.
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

  3. #3
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    Thanks for the article heads up Darren. I still dont know how i miss these posts.
    cheers

  4. #4
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    Tokyo Japan
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    Yep, the magnet trick works well!

    and as Frank says, you got to then temper the steel, or bad words will be said
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  5. #5
    will the magnets lose their magnetic power if they get too hot ?

  6. #6
    Join Date
    Nov 2006
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    Quote Originally Posted by ray hampton View Post
    will the magnets lose their magnetic power if they get too hot ?
    Maybe if they get too hot.
    But this technique will not get them hot, only mildly warm.
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

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