Jul 15 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication
Machinability
Welding
Heat Treatment
Introduction
Brass is an alloy mainly consisting of copper and zinc. Brass alloys can be easily shaped and are available in various colors. They are used in several applications such as bearings, gears, doorknobs, locks, ammunition casings and valves as well as for plumbing and electrical applications.
The following datasheet gives an overview of UNS C99700 copper alloy.
Chemical Composition
The following table shows the chemical composition of UNS C99700 copper alloy.
|
Element |
Content (%) |
|
Copper, Cu |
≥ 54 |
|
Zinc, Zn |
19 - 25 |
|
Manganese, Mn |
11 - 15 |
|
Nickel, Ni |
4 - 6 |
|
Lead, Pb |
≤ 2 |
|
Tin, Sn |
≤ 1 |
|
Iron, Fe |
≤ 1 |
|
Aluminum, Al |
0.50 - 3 |
Physical Properties
The physical properties of UNS C99700 copper alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
8.19 g/cm3 |
0.296 lb/in3 |
Mechanical Properties
The mechanical properties of UNS C99700 copper alloy are outlined in the following table.
|
Properties |
Metric |
Imperial |
|
Hardness, Brinell (3000 kg, sand cast) |
110 |
110 |
|
Hardness, Brinell (3000 kg, die cast) |
125 |
125 |
|
Tensile strength ( sand cast) |
380 MPa |
55100 psi |
|
Tensile strength (die cast) |
450 MPa |
65300 psi |
|
Yield strength (@ 0.5%, sand cast) |
170 MPa |
24700 psi |
|
Yield strength (@ 0.5%, die cast) |
185 MPa |
26800 psi |
|
Poisson's ratio |
0.34 |
0.34 |
|
Modulus of elasticity |
1147 GPa |
17000 ksi |
|
Elongation at break (in 50 mm, die cast) |
15% |
15% |
|
Elongation at break (in 50 mm, sand cast) |
25% |
25% |
|
Machinability (UNS C36000 (free-cutting brass) = 100) |
80 |
80 |
Other Designations
Other designations that are equivalent to UNS C99700 copper alloy include:
Fabrication
Machinability
The machinability rate of UNS C99700 copper alloy is 80.
Welding
UNS C99700 copper alloy can be welded using brazing, soldering, and oxyacetylene welding processes.
Heat Treatment
UNS C99700 copper alloy can be stress relieved at a temperature of about 370°C (700°F). The time taken for stress relieving is about 1 h/in. of section thickness. They do not respond to heat treatment.