Sep 11 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Forging
Hot Working
Cold Working
Annealing
Applications
Introduction
UNS C17200 beryllium copper alloys are ductile and produced in mill hardened and heat treatable tempers. These alloys are used for all applications, which require high strength, stiffness and good conductivity. The tensile strength of C17200 copper is over 1380 MPa (200 ksi).
The following datasheet will explain about UNS C17200 beryllium copper alloys.
Chemical Composition
The following table shows the chemical composition of UNS C17200 copper.
| Element |
Content (%) |
| Cu |
97.9 |
| Be |
1.9 |
| Co |
0.20 |
Physical Properties
The physical properties of UNS C17200 copper are given in the following table.
| Properties |
Metric |
Imperial |
| Density (during age hardening, 2% max. decrease in length and 6% max. increase in density) |
8.25 g/cm3 |
0.298 lb/in3 |
| Melting point |
866°C |
1590°F |
Mechanical Properties
The mechanical properties of UNS C17200 copper are tabulated below.
| Properties |
Metric |
Imperial |
| Hardness, Rockwell B |
80.0 - 85.0 |
80.0 - 85.0 |
| Tensile strength, ultimate |
1280 - 1480 MPa |
186000 - 215000 psi |
| Tensile strength, yield |
965 - 1205 MPa |
140000 - 174800 psi |
| Elongation at break |
15.0 - 30.0% |
15.0 - 30.0% |
| Modulus of elasticity |
125 - 130 GPa |
18100 - 18900 ksi |
| Poissons ratio |
0.300 |
0.300 |
| Machinability (UNS C36000 (free-cutting brass) = 100%) |
20% |
20% |
| Shear modulus |
50.0 GPa |
7250 ksi |
Other Designations
Other designations that are equivalent to UNS C17200 copper include:
- AMS 4651
- AMS 4725
- ASTM B194
- ASTM B196
- ASTM B197
- ASTM B570
- MIL C-21657
- SAE J461
- SAE J463
Fabrication and Heat Treatment
Machinability
The machinability rate of C17200 copper alloys is 20%.
Welding
Welding procedures such as butt welding, seam welding, spot welding, coated metal arc welding, gas shielded arc welding, brazing and soldering are recommended for C17200 copper alloys. For this type of alloys, oxyacetylene welding is not recommended.
Forging
Forging of C17200 copper alloys is carried out at temperature ranging from 649 to 816°C (1200 to 1500°F).
Hot Working
C17200 copper alloys have good hot working property.
Cold Working
C17200 copper alloys have excellent cold working property.
Annealing
C17200 copper alloys are annealed at temperature ranging from 774 to 802°C (1425 to 1475°F).
Applications
The following are the major applications of the UNS C17200 copper:
- Electrical/electronic connectors
- Current-carrying springs
- Precision screw machined parts
- Welding electrodes
- Bearings
- Plastic molds
- Corrosion resistant components