>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
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