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What alloy are you talking about?
As far as the interior of the forge goes I'll second Ray's suggestion. Remove the bricks, they'll break down from the flame if you don't coat them with a refractory, and replace them with another layer of ceramic matting and cover that with a thin coat of a refractory. Something is wrong with the design if it is taking 35 minutes to come up to a working heat. My solid castable refractory forge doesn't take half that long. It does, however, have a blown burner rather than a venturi.
Doug
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