My employer came to me with an interesting problem. He wants to have polished exhaust stacks on our tugboats but doesn't want to do the maintenance required. I proposed electro-polishing the stacks for maximum corrosion resistance however, that does nothing to prevent discoloration from heat. Are there other non-ferrous alloys that can resist discoloration at temperatures around 500°F and handle severe salt exposure? I jokingly threw out gr2 titanium but I don't know much about it. The pipe is 8ft x 18" diameter 10ga and I'm assuming the budget needs to stay below the $10k mark for two of them.
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