Gallagher
> Sent: Wed, Aug 14, 2019 11:12 am
> Subject: Re: Stus-List Replacing Chainplates
>
> Josh,
>
> Stress corrosion cracking is caused by chlorides (salt) and high tensile
> stress, and while it is always a possibility with 304 and 3
-08:00) To: Cc: Dan
, "CNC boat owners, cnc-list"
Subject: Re: Stus-List Replacing Chainplates Fortunately our yard doesn't get
involved with stepping and unstepping masts so it's 100% my discretion.I know a
guy who does stainless. I was thinking about getting him to check out t
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502-584-7255
-Original Message-
From: Neil Gallagher via CnC-List
To: Josh Muckley via CnC-List
Cc: Neil Gallagher
Sent: Wed, Aug 14, 2019 11:12 am
Subject: Re: Stus-List Replacing Chainplates
Josh,
Stress corrosion cracking is caused by chlorides (salt) and high tensi
Josh,
Stress corrosion cracking is caused by chlorides (salt) and high tensile
stress, and while it is always a possibility with 304 and 316 SS,
keeping stress levels low enough with normal safety margins should
minimize it. Not that common in most marine fittings, even in salt water.
Neil
Thanks Josh, Neil,
Yes, I had people help me remove the mast and when the corrosion was
evident, both sailors working on the connections told me the plates had
plenty of metal and I should just clean them up - which I will definitely
do.
I'm still curious about replacement cost so while the
Neil, you mentioned fatigue cracking in aluminum. What about stress
corrosion cracking in SS?
Dan, my thought is that the plates are safe for use of the boat. I believe
it is more likely that the standing rigging will fail before the
chainplates do. I don't know about you but I have plenty of
Dan,
Grade 316 stainless is about two to three times as strong as aluminum,
it varies a lot depending on what grade Al you're using. (Some numbers:
utlimate tensile strength of 316 SS is about 84,000 psi, aluminum
6061-T6, a common marine alloy, is 42,000 psi) SS is also less prone to
CnC-List
Sent: Wednesday, August 14, 2019 9:42 AM
Cc: Dan ; CNC boat owners, cnc-list
Subject: Re: Stus-List Replacing Chainplates
Fortunately our yard doesn't get involved with stepping and unstepping masts so
it's 100% my discretion.
I know a guy who does stainless. I was thinking about getting
Fortunately our yard doesn't get involved with stepping and unstepping
masts so it's 100% my discretion.
I know a guy who does stainless. I was thinking about getting him to check
out the plates and quote me on new ones made to spec, except instead of
1/2" thickness throughout, I would ask for
FWIW. My boat has similar chainplates. Half inch thick aluminum about four feet
long. I paid $3000 to have replacements made of the chainplates and mast step
in anodized aluminum. I didn't feel qualified to change the original design.
The metal shop copied mine exactly, matching the angle of
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