foundry castings

[Ron Nossaman]

>That is my understanding as well--and the benefit even of this is somewhat
>questionable. Beyond a certain minimal level of natural stress relaxation,
>the foundry people I've talked to about this emphasize that to effectively
>stress-relieve a gray-iron casting requires a considerable amount of
>heat--800º F is a figure that comes to mind though I could be off by +/-
>100º F or so.
>
>Del

The powder coating guys soak at around 400°F for some time before and after 
the coating process to minimize out-gassing and cratering. But that's just 
surface finish stuff, not stress relief.

Ron N