[modeleng] Gunmetal / bronze

At 09:54 AM 2/21/06 -0000, you wrote:
>As an aside, the lead in leaded bronze/gunmetal appears to have no effect 
>upon silver soldering the material in question. - Alan

Alan,
        We have a continuous cast bearing bronze designated CDA932 or
C93200 (SAE660 under our old system) and I use it for many needs where
small diameter Brz bar is needed.  Locally stocked length is usually 13"
and it's sold at a surprising number of places at reasonable prices (to me
anyway), mainly because I don't have to buy 10 feet!
       This alloy is typically Cu83 Pb7 Sn7 Zn3.  I've used it regularly
for boiler bushings larger than 5/8"OD (I have PhosBrz up to 5/8") and the
7% lead content seems to have no effect at all on the (silver)
solderability when properly prepared nor does it lead to dezincification.
I did check this last issue with the mfgs and found that at this level of
Zn content it is not a "brass" and dezincification is not a safety issue.


Regards,
Harry Wade
Nashville  Tennessee

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