I think we are going to go with S32760 duplex for the fastener and nut as suggested. We have a few small inserts in an FRP structure that will interface with the head of the "bolt". I am thinking of specifying K500 as an option for these plates because FEA shows we need high strength for these...
I had been taking a second look at the super duplex alloys for this application. The reason being that 718 is strong but doesn't have the corrosion resistance of most of the other alloys in question, 625 is close, but not quite strong enough in the annealed condition (looks like it can be PH to...
As a preliminary search I use a site that shows how many mills and distributors in North America make or carry a specific alloy. When I searched for C22 it looked like a fair amount of both, which would lead me to believe the material is readily available. It actually looked like a really good...
Want to keep nut and bolt materials different to lessen the chance of galling. K500 and C276 look good but they appear somewhat far apart on a galvanic chart. The boat the system is installed on has cathodic protection but I am not sure how close we are to an anode. Is galvanic corrosion...
Aquamet 22 looks like Nitronic 50 with a different name, right? I don't think Nit 50 has the corrosion resistance I need for this application. I think at least a super duplex or 6Mo is required. We have a number of examples of small parts made from Nit 50 showing substantial crevice corrosion...
Waiting to hear back from a couple materials suppliers on availability of toughmet.
I have been reading as much as possible and did see mention of corrosion of Cu based alloys in seawater near land due to contaminants from waste.
I think I may be over-emphasizing the galling requirement...
I noticed Langley doesn't list Marinel as an available alloy on their site anymore. It doesn't look like these high strength cupro-nickels are covered by an ASTM spec either. I had checked on Langley's Hiduron alloys previously and it looks like they are difficult to procure in the US and...
Ed - Don't disagree, but why not Inconel 718 or 625? Also, why not hot finished K500? Couldn't the material be machined and heat treated/aged afterwards regardless of the condition of the raw stock?
I should mention this is a very low volume application. This may impact material selection...
I have been researching materials for use in a marine fastener application, but could use some input from some of you with experience. We have a part with a socket hex drive and 3/8-16 UNC thread and a mating square captive nut. The parts will be completely submerged in seawater for most of...
To follow up - Looks like these BV specs are usually supplied as GFI. We suspect they may even be FOUO type documents which would explain why they are so difficult to find.
Thanks for the documents IRStuff, more proof that this spec exists. I think the link to purchase is actually an electronics component. I had found some on various sites with the same model number as the spec I am looking for.
I had seen those threads, unfortunately they don't really offer any answers. I had tried with both IHS and Beuth. IHS referred me to the BAAINBw site that in turn referred me to Beuth and they didn't know what I was talking about. We have a sister company in Italy that has also been...
I am looking for German specification BV0420. It has something to do with "anti-magnetic materials". So far I am having a very difficult time finding any mention of this spec anywhere, much less a copy. The furthest I have been able to get is to the German BAAINBw site. I was referred there...
