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Phosphor Bronze grade for boiler bushes

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Matt Stevens 113/04/2020 19:12:22
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Hi All,

I am building the 6" vertical AJ Reeves boiler which calls for Phosphor bronze use on the bushes.... trouble is there are lots of grades out there. What type of PB should i be using?

I have heard there are drawn and cast grades - likely the latter is easier to machine on a lathe where i don't have coolant running. Another point is that i am based in Canada so a grade i can get in North America would be great...

Thanks

Former Member13/04/2020 19:16:51
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[This posting has been removed]

Matt Stevens 113/04/2020 19:18:59
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Posted by Bill Chugg on 13/04/2020 19:16:51:

PB102 is what I use.

Bill

Hi Bill - Isnt that the drawn stuff? Does it machine ok given i am not running coolant on my 9" lathe?

I have heard Calphos 90 mentioned alot as well....

Matt Stevens 113/04/2020 19:22:21
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I see C544 mentioned as a grade...any comments?

Former Member13/04/2020 19:26:25
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[This posting has been removed]

Matt Stevens 113/04/2020 19:48:24
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Thanks Bill..... i see that McMaster-Carr carry 510 and 544 grades. I believe 544 does have some lead in it, buts its more accessible and cheaper. If this is a suitable grade for boiler bushes then it might be a good bet.

Former Member13/04/2020 19:59:25
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[This posting has been removed]

Matt Stevens 121/04/2020 20:54:08
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Interesting how Bill's posts have been removed???

Anyway, from doing abit of research, it seems that PB102 is a common grade in the UK which is equivalent to C510 in North America. C544 is more common over here yet it doesnt seem that there is a comparable British Standard equivalent. See attached link for info.... **LINK** .

I still wonder if both C544 and C510 are ok for boiler use.....i would like to buy C544 which is far more accessible.

Thoughts?

Thor 🇳🇴22/04/2020 05:54:07
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Hi Matt,

Doesn't C544 contain zinc and lead (in addition to tin)? If so it may not be as suitable as C510.

Thor

Matt Stevens 122/04/2020 13:11:06
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Yes i believe there is 4% lead in C544. Not sure about zinc.....Could you explain why you think this is a problem for boiler bushes?

I believe C544 is much easier to machine also than PB102/C510

duncan webster22/04/2020 15:39:03
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The spec for C544 is here **LINK** claims to be 'good' for brazing, so should be OK for silver solder as that is slightly lower temp.

It appears to be very similar to Colphos 90, **LINK** which machines a lot more easily than drawn PB102, which can be a right pig to drill and tap, it closes up on the drill.

 

Edited By duncan webster on 22/04/2020 15:42:56

Thor 🇳🇴23/04/2020 05:37:17
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The subject was discussed earlier, see here.

Thor

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