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Ecnerwal
 
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Default Heat treating 4130 steel at home

amdinc wrote:

you let it cool and if possible do a hardness test on it.


Be very careful _where_ you do that, of you do. One of the case studies
that was mentioned in on of my materials science courses was a brake or
wheel part which was hardness tested to verify heat-treat - they started
failing, and the failures were traced back to cracks starting in the
divot where the hardness tester had been used.

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