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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Fastenings for Wood submerged in BrineFastenings for Wood submerged in Brine
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4/17/2006 9:00 AM
 
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Silicon bronze and monel have traditionally used for longevity in fastening wood in boats below the waterline in seawater/brackish service. SS316 is useful above waterline/on-deck , but subject to pitting and crevice corrosion underwater ,particularly when covered with brine-saturated wood . The newer duplex alloys 2205, F255 and superduplex SAF2507 and superaustenitic 6% moly (as 254SMO) promise more strength and comparable service to bronze/monel . Would anyone hazard a guess as to which alloys are closest in overall resistance (to corrosion) ... Apparently 254SMO is in the realm of monel , is 2205 a bit less resistant than silicon bronze ? I have perused some papers and diagrams, and tentatively concluded that 2507 or F255 would likely be a bit better than silicon bronze ??? Thanks for your consideration, T M.
 
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5/17/2006 9:00 AM
 
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Tom: Typically, the CRA alloys for seawater service are ranked based on their PREN number. For successful service, some literature references cite >%7E42 PREN as a minimum requirement. I realize that this doesn't respond to your question regarding a comparison between the CRA's and Monel and alumimum bronze, but it can help compare the different duplex's and superaustenitics. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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