Looking to ID brass or bronze alloy

For a reed plate for accordion - I have a piece of Russian made
"latun'" - L87 type. When trying to match it to American brass
I tried different types from McMaster, including "engravers brass" -
which is the hardest they offer. Still Russian material is harder ...
so I was wondering may be what I have is a bronze alloy (it is somewhat
darker in hue compared to brass). It is important to have right
hardness as I punch out reed slots on a fly wheel press
How does say 220 bronze alloy compare to brass in terms of hardness ?
I need to have a copper alloy with hardness of say 7075 Al (150 brinell
or thereabout), something w/o any health related issues.

TY
Rashid
Reply to
rashid111
Loading thread data ...
somewhat
brinell
I'm sure you know that brasses and bronzes will vary in hardness depending on how much they've been worked. Used to be you could get 1/2 hard, 3/4 hard or full-hard brass sheets, for clock making in particular. You can add a lot of hardness to brass by rolling it or hammering it, up to the point where it gets brittle and cracks.
A spark spectrometer would make fast work of figuring out the chemical composition but you'd never know what state your original parts were in. You'd have to polish and etch a piece and look at it under a metallurgical microscope to see the grain structure.
Might be what you've got is phosphor bronze, that's used quite a bit for non-ferrous springy parts. I've got some that was used for R.F. sealing strips in military radio equipment, it's a little darker to look at than yellow brass. There was a chemical test that someone posted awhile back in RCM, turned brass one color and bronze another, might be you could go over to groups.google.com and see what turns up in the archives.
Stan
Reply to
stans4
I ordered phosphor bronze from McMaster in .064 thickness, now this alloy is _hard_, I think I might have found what I was looking for.
Will do more tests in days to come, but it does look good. Does anyone know if this one poses any health hazards ? As one plays the instrument, the air has to pass through slots in the metal and one ends up breathing that air ...
Reply to
rashid111
There shouldn't be any health hazards. They make guitar strings and harmonicas out of it.
Kelley
Reply to
Kelley Mascher

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