[modeleng] Re: Gun metal or phosphor bronze
- From: "R.L. Roebuck" <rlr20@xxxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Thu, 5 May 2005 10:14:34 +0100 (BST)
Blackgates use leaded phosphor bronze in the construction of their boilers
(but I don't know the exact grade).
There was a comment in one of Keith Wilson's articles in Model Engineer a
couple of years back I think - he said that it weas okay unless you kept
the heat on too long, and then the flus reacted with the lead and you got
an unsolderable green mess being produced.
The suggestion was that the beginner perhaps shouldn't use the leaded
bronze, they being the most likely to put in too much heat.
I agree though, bronze not gunmetal for the boiler bushes if at all
possible.
Yours,
Rich.
On Wed, 4 May 2005, Harry Wade wrote:
> At 10:50 PM 5/4/05 +0100, you wrote:
> >What should I use for boiler bushes? Gunmetal or Phosphor bronze and what
> grade? I have been told Phosphor bronze grade SA660 but as that is leaded
> and would it not cause problems when silver soldering? - Andy
>
> Andy,
> Are you in the U.S.? If so SAE660 is OK for bushes, there isn't
> enough lead content to inhibit soldering, but a phosphor bronze such as
> C510 or C521 would be better.
>
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