Aluminum chainplates

[mrgnstrn]

There are three shrouds attached, all navtec rod rigging:
-10
-6
-10
in that order (upper, intermediate, lower).
So the total, maximum load with all three at near breaking strength is about 26900 lb.
With a total tensile area of about 2 square inches, that is 13450 psi.
What does Skenes say?
Is this even a design condition that makes sense?
What grade and heat treatment/temper is likely to be the one used?

Thanks,
Keith