Royce,
I pulled out my handy dandy Copper Alloy Guide, courtesy of Olin Mills.
Unfortunately they cross Olin alloy numbers with ASTM specs. In any event,
P-bronze is between 92% and 98% copper, and the balance being tin, with the
exception of 0.1% Phosphor. Commercial bronze is 90% copper and 10% zinc.
Brass can contain as much as 37% zinc and even a little lead, the balance
being copper. A local bearing shop sells "bearing bronze" (SAE 660) as 85%
copper, 6% tin, 8% lead and 1% zinc, +- 1% on most of the values. The lead
makes for a slippery wear surface.
Hope this helps.
Jon
----- Original Message -----
From: Royce Woodbury <[EMAIL PROTECTED]>
To: Multiple recipients of sslivesteam <[EMAIL PROTECTED]>
Sent: Friday, March 24, 2000 6:45 AM
Subject: Re: materials
> Thanks for responding, Bob.
>
> I was beginning to think my questions weren't being posted. So is
phosphor
> bronze the same as SAE 660 bearing bronze. I ask because 660 is easy to
get
> anywhere, and if I ask for phosphor bronze, I know someone will ask me
what
> composition I want. And then there's that dumb look on my face. . . again
!
> I've also got some "marine" bronze. From a propeller shaft about 2" in
> diameter. I think that it's supposed to have a bit more lead in it.
>
> royce
>
> [EMAIL PROTECTED] wrote:
>
> > In a message dated 3/23/2000 11:17:54 AM Pacific Standard Time,
> > [EMAIL PROTECTED] writes:
> >
> > > it wouldn't seem to be a good idea to have the same
> > > material for bearing/wearing surfaces.
> > > Any thoughts out there?
> > I was always under the impression to use dissimilar metals for valve and
> > sliding surfaces. I have used phos-bronze successfully for cylinders
and CR
> > for the pistons. But I have also built entirely out of brass too.
Charlie
> > Mynheir builds everything out of stainless, a bit too tough for my
equipment.
> > Bob
> >
>
>
