Mystery Metal??????
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  1. #1
    Join Date
    Dec 2018
    Posts
    1,802

    Mystery Metal??????

    Just a piece of scrap on the rack. Covered in rust. Not sure what it came off of, but might have come off an old one way disc.

    Name:  mystery metal.JPG
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    I'm goin' along, and thinkin' the new bearings sure put a new step in the ol' gal...……………...then I hit the (unhardened?) material, and reality brought me right back down to the ol' 1018 blues

    Made another cut to verify, and same same.

    The insert handled it well, beautiful small chips...……..then the long stringy chips when it hit the (1018?).

    Cutter also bit deeper into the soft portion.

    Ya think it might be case hardened 1018? Took two .005 cuts, and didn't get under any layer

  2. #2
    Join Date
    Mar 2004
    Location
    B.C. Canada
    Posts
    2,727

    Re: Mystery Metal??????

    Odd that there is such a definite line. I have delivered pieces for case hardening to an outfit and the guy showed me his gas furnace. The thing created a carbon rich atmosphere ( carbon monoxide) while the pieces soaked up the carbon. He claimed he could easily go deeper than a sixteenth if the spec called for it. Our pieces were 3 inch diameter about 8 inches long with a dished end like saucer. They were case hardened on the end and we welded the things to the end of a piling. apparently the hardened circular edge would catch on a rock and fracture it rather than slipping past and moving off location.
    Your pieces must have been quenched to that line for it to be so definite.
    I am curious just how deep that skin is.

  3. #3
    Join Date
    May 2007
    Posts
    2,728

    Re: Mystery Metal??????

    flip the workpiece around in that gem you bought, and see if it happens again in same spot. in other words, however you had it chucked/mounted, switch to opposite end(s)
    Last edited by 123weld; 04-24-2019 at 10:31 PM.

  4. #4
    Join Date
    Mar 2011
    Location
    Western Washington
    Posts
    4,056

    Re: Mystery Metal??????

    Quote Originally Posted by 123weld View Post
    flip the workpiece around in that gem you bought, and see if it happens again in same spot. in other words, however you had it chucked/mounted, switch to opposite end(s)


    Now that's some good advise there...

  5. #5
    Join Date
    Jun 2017
    Location
    AJO, ARIZONA
    Posts
    2,426

    Re: Mystery Metal??????

    It's always been my understanding and experience is only a few thousandth's deep, hence the the name "case" hardening, we would usually heat with a neutral flame, furnace etc and then immerse the piece in a high carbon compound like charcoal or even powdered carbon. I really doubt that a depth of 1/16 is attainable, but it may be.
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  6. #6
    Join Date
    May 2010
    Location
    ct.
    Posts
    1,220

    Re: Mystery Metal??????

    Could the piece have been repaired with tig or
    spray welding after a bearing froze and spun on
    the shaft? Or maybe manufacturer sprayed and
    ground area where bearing or tool is located?
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  7. #7
    Join Date
    Oct 2016
    Location
    Delavan WI
    Posts
    438

    Re: Mystery Metal??????

    I am not sure about the steel but I can see there are several keys on your keyboard that never get used.

  8. #8
    Join Date
    Dec 2009
    Location
    Stevens Point, WI
    Posts
    5,003

    Re: Mystery Metal??????

    I run into changing finishes like this in my atlas many times. Going along, nice cut, then changes to something like the OP's at random places, then back nice sometimes. Many times just taking a heavier cut across the whole piece yields a better finish across the whole piece.

    I assume the edge of the cutter dulls a bit or changes in some way during the cut sometimes.
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  9. #9
    Join Date
    Mar 2009
    Location
    MN
    Posts
    5,159

    Re: Mystery Metal??????

    I have a few shafts farmers have given me off their discs. Maybe 8-10' long, 1-1/2" or so in diameter, nut welded to one end and coarse threads on the other. I always assumed they were 4140 or similar. It cuts fine as is and will harden beyond belief if you weld on it. I keep it around strictly for machined only parts that need to be tough.
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