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Popular Silicon Alloys


• C87300 Silicon Bronze • C87500 Copper Silicon Alloy • C87600 Copper Silicon Alloy • C87800 Cast Silicon Bronze Alloy • C87850 Copper Silicon Alloy


Pb Zn


Min (%) Max (%)


94.0 0.09


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


Sand Cast Tensile Strength:


Yield Strength: % Elongation:


Min (%) Max (%)


79.0 0.09 Copper + sum of named elements 99.5% min


Sand Cast Tensile Strength:


Yield Strength: % Elongation:


Min (%) Max (%)


88.0 0.09


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


Sand Cast Tensile Strength:


Yield Strength: % Elongation:


Pb


Min (%) Max (%)


80.0 0.09


Permanent Mold Tensile Strength:


Yield Strength: % Elongation:


Pb


Min (%) Max (%)


74.0 78.0


Sand Cast Tensile Strength:


Yield Strength: % Elongation:


0.25


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


80 ksi minimum 30 ksi minimum 15 minimum


C87850 Copper Silicon Alloy (U.S. EPA registered antimicrobial) Cu


Sn 0.09 0.30


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


59 ksi minimum 22 ksi minimum 16 minimum


36 | MODERN CASTING September 2016 Zn Rem Fe 0.10 P


0.05 0.20


Ni 0.20 Mn 0.10 Sb 0.10 Si


2.7 3.4


60 ksi minimum 30 ksi minimum 16 minimum


C87800 Cast Silicon Bronze (U.S. EPA registered antimicrobial) Cu


Sn Zn


12.0 16.0


Fe 0.15 P 0.01 Ni 0.20 Al 0.15 0.05


As Mg Mn S Sb Si 3.8 4.2


0.01 0.15 0.05 0.05


Note: Properties from the Copper Development Association. There is no established ASTM data yet.)


60 ksi minimum 24 ksi minimum 16 minimum


C87600 Copper Silicon Alloy (U.S. EPA registered antimicrobial) Cu


Pb


Zn 4.0 7.0


Fe 0.20 Mn 0.25 Si


3.5 5.5


45 ksi minimum 18 ksi minimum 20 minimum


C87500 Copper Silicon Alloy (U.S. EPA registered antimicrobial) Cu


Pb Zn


12.0 16.0


Al 0.50 Si


3.0 5.0


0.25 0.20


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


Casting Considerations: No furnace or ladle additions are


C87300 Silicon Bronze (U.S. EPA registered antimicrobial) Cu


Fe


Mn 0.8 1.5


Si


3.5 4.5


required when pouring the silicon alloys, and the alloys melt and pour at lower temperatures than other lead-free alloys. Tese alloys are typically much stronger and have a significant increase in fluidity over the other lead-free alloys, so they are capable of filling thinner sections. Silicon alloys contain no rare or uncommon elements. Cross contamination with any of the other alloy groups is a major problem due to the higher silicon content. When switching to silicon alloys, most of the tooling used for leaded alloys will need to be reworked. Tese alloys are gas prone if good melt practices are not followed. If a good quality charge material is not used, casting defects will occur in the form of misruns, oxide laps and white textured spots on the cast- ing surface. A significant reduction in casting yield is common due to increases in gating and risers which may increase part cost. Recycling of machining chips is difficult. Silicon alloys are the most difficult to machine compared to the other popular options.


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