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I just got an older frame powder coated. The shop that I took it to doesn't specialize in bikes. They mainly do industrial grade powder coating and perhaps a car wheel here and there, so I wouldn't consider them the most knowledgeable people when it comes to handling frames. The frame is lugged steel. Could the heating process influence the frame's integrity?

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How hot does it get? The first danger is that the brazing of the lugs could melt -- this would, in theory, happen before the steel itself was affected. Brazing temps are above about 850F. –  Daniel R Hicks Dec 22 '11 at 23:27
    
(One reference says that powder coating temps are around 390F.) –  Daniel R Hicks Dec 22 '11 at 23:29
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up vote 5 down vote accepted

No, 400F will not affect frame integrity.

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