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  1. 03-28-2012, 05:06 PM #1
    wadeg
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    Heat treating 4130 and deformation

    I need to make .125 x 4130 straps for a spar connection. I am looking for information on the deformation of 4130 after being heat treated to 125000psi. If the part were drilled before treating, would the holes match after heat treating? Should the part be drilled after heat treating?
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  2. 03-28-2012, 09:34 PM #2
    Mike Switzer
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    Usually for a bolted connection the tolerances aren't tight enough you have to worry about it. In a former job we had to machine before heat treat (the material was too hard to machine after heat treat) and we had to allow for the warpage due to heat treating, but we were talking tolerance in the range of a couple microns.

    Make one & try it out, you will probably be OK.
    Last edited by Mike Switzer; 03-29-2012 at 06:51 AM.
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  3. 03-29-2012, 11:00 AM #3
    Bill Berson
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    What about surface scaling inside the holes? This could require post heat treat reaming of the holes, depending on the fit tolerance.
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  4. 03-31-2012, 08:54 AM #4
    Neil
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    It as been a long time since I did heat treating of stamping dies but I don't remember the 4000 series of steels (shock steels)as being too bad about changing dimensionally. To prevent scaling you wrap the parts in a heat treating foil and I would put some paper in the pouch with the parts. The paper would ignite before the critical temperature was reached, burning away any oxygen in the pouch and that would almost always eliminate any scaling. Dowel fit holes were finished by either Jig Grinding or a Sunnen Hone. Bolt holes were not an issue.
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  5. 04-01-2012, 08:57 PM #5
    nrpetersen
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    Can 4130 steel be heat treated? I would think it would have to be 4140 or even 4150 before the alloy would seriously respond to heat treatment.
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  6. 04-01-2012, 09:31 PM #6
    Neil
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    Depends on your definition I suppose. We use 4130 in homebuilding because of it's forgiving nature to hamfisted attempts at welding or drawing or normalizing or whatever someone is claiming to try to do to it with a torch. Can the state of 4130 be altered from the "N" condition we purchase it in? Sure. Do we need to? Most likely not. I'm sure there may be some exceptions.

    By definition you can heat treat (alter the state of) 1018 through carbonizing but that is a little different as is nitriding.
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