Embedded Chain plate maint/replacement - Page 8 - SailNet Community
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post #71 of 185 Old 10-22-2013 Thread Starter
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Re: Embedded Chain plate maint/replacement

Just to let folks know what the reason for all the madness is.
Note the crack




Here's the good news. That's not mine. Its a plate from a Irwin 43 out of Norfolk Va that the surveyor who shot my thermal pics is currently working.

The left is the bottom - you can see the weld where the bottom horizontal bar would be - on my boat that would be directly under the heavy (yellowish) tape - the only part of the chainplate actually sealed in contact.
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post #72 of 185 Old 10-22-2013
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Re: Embedded Chain plate maint/replacement

I am very interested in this thread...I have one embedded triangular chainplate on my port forward lower shroud that islander used to fix the stay to the hull...

it only shows corrosion on the triangular exposed plate and there is no rot in then fiberglass embedding material or the knee itself but it looks very weak in an engineering point of view and looks very thin...

I would like to know once you get to that stage how you rebed the knee and plate, and what exactly you will do to "protect" the embedded chaonplate if you go that route.

thanks and good luck

ps. Im doing a major refit on my islander 36, new bulkheads on all chainplates(even the cabinetry bulkheads) new 304ss plates, and retabbing and glassing the bulkheads

The new plates will also be extended, and my aft lowers that attach to the deck only will be reinforced with stringers and extra glass work.
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Re: Embedded Chain plate maint/replacement

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Originally Posted by chucklesR View Post
Just to let folks know what the reason for all the madness is.
Note the crack




Here's the good news. That's not mine. Its a plate from a Irwin 43 out of Norfolk Va that the surveyor who shot my thermal pics is currently working.

The left is the bottom - you can see the weld where the bottom horizontal bar would be - on my boat that would be directly under the heavy (yellowish) tape - the only part of the chainplate actually sealed in contact.
No wonder they buried it in glass - that thing is NASTY. They didn't even clean the spatter off it. If I was putting that in a boat I wouldn't want anyone to see it either.
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post #74 of 185 Old 10-22-2013 Thread Starter
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Re: Embedded Chain plate maint/replacement

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Originally Posted by christian.hess View Post


ps. Im doing a major refit on my islander 36, new bulkheads on all chainplates(even the cabinetry bulkheads) new 304ss plates, and retabbing and glassing the bulkheads
Just FYI - I would not go with 304 SS - go with 316 L - the L stands for low carbon. Less carbon = less rust, and yah, less strength (but still within design specs I bet).


Here's two more pictures found by Dylan (Dylan Bailey Yacht Services, the surveyor I used on this).
Again, not from my boat:


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post #75 of 185 Old 10-22-2013
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Re: Embedded Chain plate maint/replacement

The L does stand for low carbon but has nothing to do with rust. both 316 and 304 alloys of stainless steel come in an L variation. it is the extra chromium in the 316 that makes it more corrosion resistant than 304. the L does make the alloy less affected by chromium carbide precipitation after welding which can have an effect on intergranular corrosion of the welding heat effect zone
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Re: Embedded Chain plate maint/replacement

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The L does stand for low carbon but has nothing to do with rust. both 316 and 304 alloys of stainless steel come in an L variation. it is the extra chromium in the 316 that makes it more corrosion resistant than 304. the L does make the alloy less affected by chromium carbide precipitation after welding which can have an effect on intergranular corrosion of the welding heat effect zone
Is there any easy way to tell if they use the product you spec? How can you tell different grades of SS, unless you provide your shop with the product.
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post #77 of 185 Old 10-23-2013
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Re: Embedded Chain plate maint/replacement

When I remade a chainplate last year i asked the shop to keep the invoice and certificate from the steel supplier so I could see it was 316L. I'm not sure you would have a way of knowing without the invoice/certificate unless you took it to a lab.

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post #78 of 185 Old 10-23-2013 Thread Starter
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Re: Embedded Chain plate maint/replacement

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The L does stand for low carbon but has nothing to do with rust. both 316 and 304 alloys of stainless steel come in an L variation. it is the extra chromium in the 316 that makes it more corrosion resistant than 304. the L does make the alloy less affected by chromium carbide precipitation after welding which can have an effect on intergranular corrosion of the welding heat effect zone
Exactly - which for layman means - Less rust.

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Re: Embedded Chain plate maint/replacement

Usually a magnet will have a very slight pull to 304 and zero pull to 316.
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post #80 of 185 Old 10-25-2013
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Re: Embedded Chain plate maint/replacement

yeah thanks they did not have 316 at the time...the originals where specd to be 304 they have no noticeable pull tp them...so thats what we went with...they are highly polished anyways and I will be pulling them periodically...

the 316 failed cause fo crevice corrosion and cyclic loading...also where it was hidden, also 316 is slightlymore brittle and will crack suddenly whereas apparently 304 will stretch a bit more and give signs of failure something I see good on a chain plate that gets a lot of vibration if SAILED hard...


again Im eager to see what you end up doing...good luck!

ps. those pics are of the old chainplate? mine were really corroded and brown inside...not shiny at all like yours(the pic)
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