[PSUBS-MAILIST] Hull Calc: 78" spheres

[Sean T. Stevenson via Personal_Submersibles]

On 2015-01-09 20:16, hank pronk via Personal_Submersibles wrote:
> just to make things interesting.  I found two aluminum 60 in spheres 3 in thick wall and maybe 6 in thick flange.  They appear to be cast and perfectly round.
> Hank--------------------------------------------
>
Any idea as to alloy? Looking for:

ASTM B 209 Alloy 6061-T6
ASTM B 928 Alloy 5083
ASTM B 928 Alloy 5086
ASTM B 209 Alloy 5383
ASTM B 209 Alloy 5456

Sean