Material Identification

[moiz19670309]

Ni 0.06
Cu 61.44
Zn 38.39
Nb 0.11

Please help me to identify the above material.

 

[btrueblood]

Alpha brass. The Ni and Nb are tramp elements.

http://www.copper.org

 

[moiz19670309]

Any ASTM number for the Alpha Brass. I have to use this material for M10 bolt. The bolt has to be tightened to 40 Newton Meter torque. Any other suggestions for material.

 

[EdStainless]

Was this chemistry by handheld XRF?
Was the surface well prepared?
Was it run in double precision mode?
There are at least 15 brass alloys within a few % of these numbers.
What product form? casting? Plate? Tube?
If it is plate then it is likely Muntz, ASTM B111.

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P.E. Metallurgy, consulting work welcomed

 

[moiz19670309]

 

[moiz19670309]

It is a bolt, composition identified using XRF, surface well prepared, used double precision mode.

 

[MagBen]

seems to me Naval brass C464. ASTM B21.
Other grades with similar Zn content are C462, C268.
not sure what role it is for 0.1% Nb, prossibly to improve mechanical or corrosion resistance.
c464 is hard to form a single alpha solid solution alloy, but rather a two-phase alpha+beta. beta strengthens the alloy. Both C462 and C268 tend to be a single alpha phase