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Old 30-11-2010, 23:19   #16
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externalize the internal chainplates--make life simple and go for whatever metal rocks yer boat..LOL..i am going with 316 ss
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Old 01-12-2010, 01:10   #17
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2205 stainless

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Originally Posted by Jim Cate View Post
G'Day all,

I'm surprised that in this learned discussion, no one has mentioned 2205 duplex stainless as chainplate material. This alloy is stronger, stiffer and more corrosion resisitant than 316L, and is ideally suited to chainplate fabrication, especially if said plates are to be buried or sealed in way of deck penetrations. While a bit pricier than 316, is is far cheaper than Titanium.

Cheers,

Jim
Jim, thanks for mentioning it. I've not actually come across 2205 ss, but from a brief search it sounds like this metal has potential due to it's higher resistance to crevice corrosion. Arguably such corrosion is the number one concern with internal chainplates.

You say pricier than 316 - is it more than double the price, and do you have experience of using it for anything?

Martin
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Old 01-12-2010, 05:48   #18
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i am in process of externalizing my internal ones--will allow me to replace easily and will lend more flexibility for foresail handling-
How will that affect the sheeting angle on your foresail?
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Old 01-12-2010, 05:52   #19
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Jim, thanks for mentioning it. I've not actually come across 2205 ss, but from a brief search it sounds like this metal has potential due to it's higher resistance to crevice corrosion. Arguably such corrosion is the number one concern with internal chainplates.

You say pricier than 316 - is it more than double the price, and do you have experience of using it for anything?

Martin
Can it be readily machined? Where can a DIYer get 2205 bar?
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Old 01-12-2010, 06:11   #20
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McMaster Carr sells 2205 SS in a variety of shapes.
McMaster-Carr

They also have a nice summary of other SS types. For whatever reason they don't have the properties of 2205 (machinability etc. ) listed in the table.
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Old 01-12-2010, 06:17   #21
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McMaster Carr sells 2205 SS in a variety of shapes.
McMaster-Carr

They also have a nice summary of other SS types. For whatever reason they don't have the properties of 2205 (machinability etc. ) listed in the table.
Thanks. I looked it up. I agree, with the possible exception of machinability and the price (wow!), it looks like the ideal material - more corrosion resistant, especially to seawater.

Thanks for the tip, Jim Cate!
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