Jul 17 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication
Applications
Introduction
Cast silicon brasses are high strength brasses belonging to the family of copper alloys. Brasses are formed when copper is alloyed with zinc. Other elements, such as silicon and lead, are added to further enhance the properties of brass.
The following datasheet discusses the chemical composition and properties of copper UNS C87800.
Chemical Composition
The chemical composition of UNS C87800 copper alloy is outlined in the following table.
|
Element |
Content (%) |
|
Copper, Cu |
80 |
|
Zinc, Zn |
12-16 |
|
Silicon, Si |
3.8-4.2 |
|
Tin, Sn |
0.25 |
|
Nickel, Ni |
0.2 |
|
Aluminum, Al |
0.15 |
|
Manganese, Mn |
0.15 |
|
Iron, Fe |
0.15 |
|
Lead, Pb |
0.09 |
|
Antimony, Sb |
0.05 |
|
Arsenic, As |
0.05 |
|
Sulfur, S |
0.05 |
|
Magnesium, Mg |
0.01 |
|
Phosphorous, P |
0.01 |
Physical Properties
The following table discusses the physical properties of copper UNS C87800.
|
Properties |
Metric |
Imperial |
|
Density |
8.28 g/cm3 |
0.299 lb/in3 |
|
Melting point |
821 - 917 °C |
1510 - 1680 °F |
Mechanical Properties
The mechanical properties of UNS C87800 copper alloy (sand cast) are tabulated below.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
460 MPa |
66700 psi |
|
Yield strength |
205 MPa |
29700 psi |
|
Modulus of elasticity |
106 GPa |
15400 ksi |
|
Elongation at break |
21% |
21% |
|
Hardness, Brinell |
134 |
134 |
|
Hardness, Rockwell B |
85 |
85 |
|
Machinability |
40 |
40 |
Thermal Properties
The thermal properties of copper UNS C87800 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-300°C/68-572°F) |
19.6 x10-6/°C |
10.90 x 10-6/°F |
|
Thermal conductivity (@20-/68°F) |
27.7 W/mK |
16 BTU in/hr.ft2.°F |
Other Designations
Other designations that are equivalent to copper UNS C87800 include:
-
ASTM B584
-
ASTM B176
-
ASTM ZS144A
-
ASTM B806
-
SAE J461, J462
-
ASTM B30
Fabrication
Soldering, brazing, and gas shielded arc welding are rated as excellent techniques to weld. Coated metal arc welding, spot welding, seam welding, and butt weld are considered good options.
Applications
Copper UNS C87800 finds application in:
-
Lever arms
-
Pump impellers
-
Brush holders
-
Tools and gears
-
Hexagonal nuts
-
General hardware
-
Marine hardware
-
Clamps and brackets
-
Valve parts and plumbing parts
-
Corrosion resistant components
-
High strength, thin walled die castings