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  1. #1
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    Default What Type Of Steel Is This?

    What type of steel is this?
    I found 3 of these 100 mm dia, I am guessing they where form earth moving equipment.
    My bandsaw hardly mark it, even with a new blade on it.
    I tried cutting down about 4 - 5 mm with an angle grinder but made no difference.


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  2. #2
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    Impossible to tell from a photo a guess would be something that has been case hardened

  3. #3
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    Mark, it's very hard steel.
    It actually looks like a pin from an excavator bucket or similar.
    As to the type, it would be anyones guess, probably be a job for a metalurgist to work that one out.
    Kryn
    To grow old is mandatory, growing up is optional.

  4. #4
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    Default

    You could try tempering them a bit in a wood stove or similar if you have access.

  5. #5
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    Default

    That pin is case hardened. You will struggle to do much with it unless you have a beefy lathe and CBN tools to turn the case off. with out a spectrogragh its impossible to tell what grade it is, but by guess would be 1045,4140 or something similar.

  6. #6
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    Quote Originally Posted by snapatap View Post
    That pin is case hardened. You will struggle to do much with it unless you have a beefy lathe and CBN tools to turn the case off. with out a spectrogragh its impossible to tell what grade it is, but by guess would be 1045,4140 or something similar.
    tsk tsk, I thought you of all people would know 4140 etc can not be case hardened as it already has a high carbon content.

    Probably induction hardened then chromed.

    I have a heap of those sorts of pins here.
    Gold, the colour of choice for the discerning person.

  7. #7
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    I have case hardened 4140 and 4130 without a problem.

  8. #8
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    Quote Originally Posted by KBs PensNmore View Post
    Mark, it's very hard steel.
    It actually looks like a pin from an excavator bucket or similar.
    As to the type, it would be anyones guess, probably be a job for a metalurgist to work that one out.
    Kryn
    That what I wondered.
    Seemed a shame to let it get buried.

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  9. #9
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    Quote Originally Posted by caskwarrior View Post
    You could try tempering them a bit in a wood stove or similar if you have access.
    I have a wood BBQ, How long would you have to leave it in there?

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  10. #10
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    Quote Originally Posted by snapatap View Post
    That pin is case hardened. You will struggle to do much with it unless you have a beefy lathe and CBN tools to turn the case off. with out a spectrogragh its impossible to tell what grade it is, but by guess would be 1045,4140 or something similar.
    How deep would the case hardening go?
    Seems a shame not being able to make use of these.

    Would a Hercus 260 be big enough?

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    Ratty 05/2004 -05/07/2010 COOPER 01/08/1998-31/01/2012

  11. #11
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    Quote Originally Posted by wm460 View Post
    I have a wood BBQ, How long would you have to leave it in there?

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    Keep the steel at red hot for an hour or so then leave it in the coals to cool down slowly, overnight should do it.

  12. #12
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    Quote Originally Posted by Techo1 View Post
    I have case hardened 4140 and 4130 without a problem.

    I did an experiment some years back. A piece of 4140 and mild steel, in a charcoal based case hardening mix together. Then quench hardened.

    The mild steel measured at Rockwell 60 afterwards, the 4140 only 50. No more then just a normal quench would have achieved without case hardening.
    Gold, the colour of choice for the discerning person.

  13. #13
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    A mob in my town makes replacement pins for excavators and farm equipment. They machine them from 1050 steel, then send them off for nitriding to achieve the hard case. The pins are returned and then turned to size using CBN inserts.

    Hard af.

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