"The alloy of choice for a boat hull"
"I am currently building a sailboat and have been looking at different alloys for the construction; the goal is not to require any surface protection (paint) and moderate material cost. The material of choice would be titanium (Grade 2-3) but the raw material cost would exceed $60.000 US. The alternatives are aluminium and stainless. Common alloys include aluminium in the 5xxx and 6xxx series and Stainless 316. After quite a bit of reading I do not bereave any of these alloys would be sufficient even if great care would be taken to prevent galvanic corrosion and eliminate all crevices. (Please correct me if you do not agree) Some of the other alloys I am looking at are: Monel 400, AL6XN, NITRONIC 50, AquaMet 17/19/22, and FERRALIUM® 255. Could you please give a recommendation on which material would be suited for this application?"
Of the alloys you listed, you might consider Monel 400 and Al6XN. Of course, all of the alloys you listed will be expensive.
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