It's very unlikely to hurt anything. Many larger annealers - my own included - use metal racks to hold shelves. I've taken mine to the equivalent of heat treat temperatures before and never had a problem.
Edit: I just looked up the GL18 specs and see that it's only rated for 1700F. How hot is his heat treat? (Usually between 1500 and 1700F, I think.) Because of the low max rated temp, you may be taxing your elements a little bit if it's a long, hot heat treatment. If it was my own kiln I wouldn't be too concerned, but I might hesitate to recommend it to someone else.
Brad
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