Nov 12 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding Forging Hot Working Cold Working AnnealingApplications
Introduction
Copper can be formed into alloys more easily than most metals. It can also be combined with a wide range of alloying elements. Copper possesses excellent electrical and thermal conductivity of any commercial metal. There are 400 types of copper alloys with each comprising many properties that are suitable for various applications, manufacturing processes, and environments.
UNS C44500 alloys are a type of brass-copper alloys with medium leaded property. It is also known as naval brass. These alloys have good corrosion resistance and hot forgeability, and free-cutting features. The following datasheet will provide details about UNS C48200 medium leaded brass-copper alloys
Chemical Composition
The following table shows the chemical composition of the UNS C48200 medium leaded brass-copper alloys.
| Element |
Content (%) |
| Cu, Copper |
60.5 |
| Pb, Lead |
0.7 |
| Sn, Tin |
0.8 |
| Zn, Zinc |
38 |
Physical Properties
The physical properties of UNS C48200 medium leaded brass-copper alloys are outlined in the following table.
| Properties |
Metric |
Imperial |
| Density |
8.44 g/cm3 |
0.305 lb/in³ |
| Melting point |
888°C |
1630°F |
Mechanical Properties
The mechanical properties the UNS C48200 medium leaded brass-copper alloys are tabulated below.
| Properties |
Metric |
Imperial |
| Tensile strength |
386-517 MPa |
56000-75000 psi |
| Yield strength (depending on temper) |
172-365 MPa |
24900-52900 psi |
| Elongation at break (in 381 mm) |
43.00% |
43.00% |
| Elastic modulus |
117 GPa |
17000 ksi |
| Poisson’s ratio |
0.34 |
0.34 |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
50 |
50 |
| Shear modulus |
39.0 GPa |
5660 ksi |
Thermal Properties
The thermal properties of the UNS C48200 medium leaded brass-copper alloys are tabulated below.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (20-300°C/68-572°F) |
21.2 µm/m°C |
11.8 µin/in°F |
| Thermal conductivity |
116 W/mK |
805 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to UNS C48200 medium leaded brass-copper alloys are:
- ASTM B124
- ASTM B21
- ASTM B283
- QQ B639
Fabrication and Heat Treatment
Machinability
The machinability rate of UNS C48200 medium leaded brass-copper alloys are 50.
Welding
Soldering, brazing, and butt welding are considered as suitable welding processes, whereas processes such as oxyacetylene welding, gas shielded arc welding, coated metal arc welding, spot welding, seam welding are not recommended for UNS C48200 alloys.
Forging
UNS C48200 alloys have a hot forgeability rating of 90 with the recommended hot working temperature being between 649 and 760°C (1200 and 1400°F).
Hot Working
The hot working capacity of UNS C48200 alloys is good.
Cold Working
The cold working capacity of UNS C48200 alloys is poor.
Annealing
The annealing temperature of UNS C48200 alloys is between and 427 and 593°C (800 and 1100°F).
Applications
UNS C48200 medium leaded brass-copper alloys are used in fasteners, hardware requiring corrosion resistant service, and marine applications. It is also used for high strength cold headed products.