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Shackle material to resist stress corrosion cracking

Shackle material to resist stress corrosion cracking

Shackle material to resist stress corrosion cracking

(OP)
We use a safety cable and shackle system as a redundant backup for things we attach to ceilings/roof structures.  For the applications going into indoor swimming pools we have specified mostly 6%Mo fastener material to guard against SCC.  I'm having trouble finding a shackle made of this material however.  I had heard about some coatings with extremely high salt spray ratings and wondered if a 316 steel with some treatment might not work?  Does anyone have any thoughts on this?

Thanks   

RE: Shackle material to resist stress corrosion cracking

Unless the quantities needed are large, I would have shackles machined from a suitably resistant stainless steel, e.g., 6%Mo.  Most of these high performance coatings that you have reviewed are meant to be applied over conventional carbon/alloy steels that have been pretreated with zinc phosphate or electrodeposited zinc/zinc alloy coatings.  Surface preparation of Type 316 would be a big question mark for me.

RE: Shackle material to resist stress corrosion cracking

You can also evaluate the use of a duplex stainless steel for shackles.

RE: Shackle material to resist stress corrosion cracking

I would guess that sailboat hardware might work well.

RE: Shackle material to resist stress corrosion cracking

No, boat hardware isn't rated for overhead safety.
You would be better off with 2205.  It isn't as corrosion resistant as a 6% Mo, but is stronger and resists cracking better.

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