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Popular Copper Bismuth Alloys


• C89833 copper bismuth alloy • C89836 copper bismuth alloy • C89520 copper bismuth sele- nium alloy (SeBiLOY II, Enviro- Brass II)


Pb


Min (%) Max (%)


86.0 91.0


Sand Cast Tensile Strength:


Yield Strength: % Elongation:


Pb


Min (%) Max (%)


87.0 91.0


Sand Cast Tensile Strength:


Yield Strength: % Elongation:


Pb


Min (%) Max (%)


85.0 87.0


0.09


Sn 4.0 6.0


Zn 2.0 6.0


Fe Note: All properties from ASTM 13584-14 unless otherwise noted.


C89833 Copper Bismuth Alloy (U.S. EPA registered antimicrobial) Cu


0.30


Copper + sum of named elements 99.3% min Ni value included Co


30 ksi minimum 14 ksi minimum 16 minimum


C89836 Copper Bismuth Alloy (U.S. EPA registered antimicrobial) Cu


0.25


Sn 4.0 7.0


Copper + sum of named elements 99.5% min Ni value included Co


33 ksi minimum 14 ksi minimum 20 minimum


C89520 SeBiLOY II (EnviroBrass II) (U.S. EPA registered antimicrobial) Cu


0.09


Sn 5.0 6.0


Copper + sum of named elements 99.5% min Ni value included Co Bi:Se >= 2:1


Sand Cast Tensile Strength:


Yield Strength: % Elongation:


25 ksi minimum 17 ksi minimum 6 typical


Casting Considerations In most cases, very few gating modifications will be


required when changing from leaded brass patterns. Te melting and pouring is very similar to the leaded brasses, but a slight increase in pour temperature is typical. Chips and returns are highly recyclable as long as the chips are dry enough to safely melt, and sound housekeeping prac- tices are maintained to avoid cross-contamination with leaded alloys. Tese alloys are more gas prone than the leaded brasses. Tey are also more brittle, so new casting


processes may need to be implemented to avoid crack- ing during shakeout and finishing. Contamination with leaded material is detrimental and metalcasting facilities pouring both bismuth and lead containing alloys need to be very careful to avoid cross contamination. Tis is also a major concern if bismuth alloys get into leaded alloys. Bismuth alloys are more difficult to machine compared to the leaded brasses. If overheated during machining or soldering, bismuth alloys have a potential to crack.


September 2016 MODERN CASTING | 35


Zn 4.0 6.0


Fe 0.20 Ni 0.90 Al 0.005 Bi


1.6 2.2


S 0.08 Sb 0.25 Si


0.8 1.1


Zn 2.0 4.0


Fe 0.35 P 0.06 Ni 0.90 Al 0.005 Bi


1.5 3.5


S 0.08 Sb Si 0.25 0.005 P 0.050 Ni 1.0 Al 0.005 Bi


1.7 2.7


S 0.08 Sb Si 0.25 0.005


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