Niel,
You are right, 4130 is air hardening.
Jim in Palmdale
> Jim;
>
> A chop saw (abrasive cut-off wheel) isn't recommended for cutting 4130
steel
> tubing. The heat of friction leaves the alloy in poor condition for about
> 1/8" from the cut. I read this somewhere but I can't tell you that
source--
> I simply can't remember where I saw it.
>
> Regards, Neil Tucson, AZ
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