[Public-list] Marine Alloys of bronze

[John Birch]

Silicon Bronze usually copper / tin sometimes a bit of lead or manganese 
(Lead & manganese) aid in the flow as a lubricant and usually 1-3% silicon - 
becomes harder when worked or rolled. Cupronickel is a copper nickel hybrid. 
Manganese Bronze has much more manganese in it than SB (if the SB has any in 
it at all). Very much a foundry choice - there are hundreds of variations. 
Skene's Elements of Yacht Design has pages on it. Capt Nat built using SB. 
That Concordia Gord was talking about on another thread would have likely 
been fastened with SB

SB can be melted down and recast almost infinitely with the components 
remaining in compound well mixed - has a great lattice structure. Survives 
well in aerobic and anaerobic saline solutions unlike SS.

Lots on Google on Bronzes.

So Gord, gonna cast me some long nines out of LG2 to match the Rush Baggot ? 
; )
Can never be too sure ; )

Cheers,

John

----- Original Message ----- 
From: "Gordon Laco" <mainstay at csolve.net>
To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
Sent: Thursday, October 19, 2006 11:22 AM
Subject: [Public-list] Marine Alloys of bronze


> OK - I am back in the office... Am not going to go for the wooden boat. 
> She
> is a Concordia yawl - but rescuing her is beyond my means.  I must be
> becoming an adult to come to such a rational conclusion...
>
> Alloys:
>
> LG2 Gunmetal:
>
> 85% copper, 5% lead, 5% tin, 5% zinc.
>
> This alloy is good for portlights, cleats, chocks etc.  Yes, it was once
> used for cannon.
>
> AB2 Aluminium Bronze:
>
> 83% copper, 10% aluminium, 5% nickel, 3% iron
>
> Very stiff and strong - great where hardness and strength are required.
> Good for chainplates, lifeline stanchions, shackles etc.
>
> Silicon Bronze
>
> Sorry, don't have the ingredients for this one but it is good for similar
> applications to that of AB2, but is not so expensive.  You see this one 
> most
> often in turnbuckles, toggles, pins, fastenings etc.
>
> Gord #426 Surprise
>
>
>
>
>
>
>
>
>> Gord,
>>
>> Do you remember the name of the proper alloy of Auminum Bronze?  Metal
>> dealers often sell their offcuts on Ebay.  I've seen Aluminum Bronze,
>> but never Silicon Bronze.
>>
>> - George
>>
>
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