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Galvanized Steel’s Performance in Extreme Temperatures

How does hot-dip galvanized steel perform in environments with extreme temperatures (either hot or cold)?
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Polarity Reversal

I got a call the other day, and the fellow on the phone said someone told him galvanized steel cannot be used above 140 F (60 C) because the zinc reverses polarity and causes the steel to corrode. What is this effect and should I be telling people not to use galvanized steel in high temperature environments?
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Galvanizing Application at 475 F

My customer wants to use some galvanized supports for a furnace. The normal temperature around the steel will be about 475 degrees F. is this a good application for galvanized material?
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