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at the same time, rapid cooling is more likely to cause cracking than to high of a temperature. The wrap will remain the heat longer assuming its PROPERLY covered. Usually people have exposed areas, and these will cool much faster than the wrapped areas which will develop stress cracks over time in the thinner steel. You CAN have such a thick steel that stress cracking can't occur but that concept is not practical for the topic at hand.
A ceramic coated SS header would probably be the best bet overall.
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