[Public-List] Propeller Shaft Material

[George Dinwiddie]

Gord,

What do you think about the potential for crevice corrosion in 
stainless? http://alberg30.org/maintenance/Steering/CreviceCorrosion/

  - George

Gordon Laco wrote:
> Hello -
> 
> I have aluminium bronze in 1 1/2" rod in stock; I use it to fabricate 
> custom large turnbuckle studs and lifeline stanchions.  Alum Bronze is a 
> particularly hard alloy but that said, I think a 316 grade stainless 
> shaft will be superior in most aspects including avoidance of galvanic 
> corrosion and certainly wear.  The Achilles heel of 316 is that it is 
> relatively brittle compared to galv steel or 304... but hardness and 
> stiffness is what you want in a prop shaft.  Not malleability, which is 
> what makes bronze alloys attractive.    If I were having a new shaft 
> made I would use 316 stainless with no hesitation.

-- 
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