Aug 22 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Welding
Machinability
Heat Treatment
Introduction
Bronze alloys are many in number and they include:
-
Phosphor bronze
-
Tin bronze
-
Aluminum bronze
-
Silicon bronze
-
Architectural bronze
-
Manganese bronze
The UNS C92700 alloy is a leaded tin bronze, copper casting alloy. The datasheet given below provides an overview of the UNS C92700 alloy.
Chemical Composition
The chemical composition of the UNS C92700 alloy is outlined in the following table.
|
Element |
Content (%) |
|
Copper, Cu |
86.0-89.0 |
|
Tin, Sn |
9.0-11.0 |
|
Lead, Pb |
1.0-2.50 |
|
Nickel, Ni |
1.0 |
|
Zinc, Zn |
0.70 |
|
Phosphorus, P |
0.25 |
|
Iron, Fe |
0.15 |
|
Aluminium, Al |
0.0050 |
Physical Properties
The following table shows the physical properties of the UNS C92700 alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.80 g/cm³ |
0.318 lb/in³ |
Mechanical Properties
The mechanical properties of the UNS C92700 copper alloy are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Hardness, Brinell |
77 |
77 |
|
Tensile strength |
290 MPa |
42100 psi |
|
Yield strength (@strain 0.500%) |
145 MPa |
21000 psi |
|
Elongation at break (in 50 mm) |
20.00% |
20.00% |
|
Machinability (UNS C36000 (free-cutting brass) = 100) |
45 |
45 |
|
Poisson's ratio |
0.34 |
0.34 |
|
Elastic modulus |
117 GPa |
16969 ksi |
Thermal Properties
The thermal properties of the UNS C92700 alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-177°C/68-351°F) |
18.0 µm/m°C |
10.0 µin/in°F |
Other Designations
Equivalent materials to the UNS C92700 alloy are:
-
ASTM B30
-
ASTM B505
-
QQ C390
-
SAE J461
-
SAE J462
Fabrication and Heat Treatment
Welding
Welding processes suitable for the UNS C92700 copper alloy include brazing and soldering. Welding processes not recommended for this alloy include gas shielded arc welding, carbon arc welding, coated metal arc welding and oxyacetylene welding.
Machinability
The machinability rating of the UNS C92700 alloy is 45.
Heat Treatment
The UNS C92700 alloy has stress relieving temperature of 260°C (500°F). Work pieces should be soaked at the the stress relieving temperature for one hour per inch of work piece thickness.
This alloy does not react to heat treatment.