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elongation with EN36A after heat treatment

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dogbural

dogbural

Aerospace
Joined
Jan 25, 2009
Messages
74
Location
AU
Hi,

We have noticed that parts machined with En36A experienced elongation (or bend) after heat treatment (case hardening), whereas the dimensional change with that machined with SAE8632 (or SNCM 220) is very little.
The part has a geometry of shaft.

We had even spectrometer analysis, showing the parts are within spec of EN36A.

Is it something we usually see that SAE 8632 gives better result?

 
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