UNS-C17500-Beryllium-Copper

UNS C17500 Beryllium Copper Alloys

CuCo2Be—UNS C17500 (CW104C) Cobalt Beryllium Copper is good to excellent corrosion resistance and has Excellent cold workability and good hot formability.

CuCo2Be-C17500 (CDA 175) beryllium-cobalt copper is primarily used in industrial applications requiring the highest thermal or electrical conductivity with the addition of a cobalt alloy (2.40-2.70%).

C17500 also has good strength and hardness properties with electrical conductivity in the 45-60% range of copper and ultimate tensile and hardness properties close to 140 ksi and RB 100 respectively.

Chemical Composition:

Element
Cu(1,2)FeAlBeCoSi
(1) Cu value includes Ag.(2) Cu + Sum of Named Elements 99.5% min.
Min (%)0.42.4
Max (%)Rem0.100.200.72.70.20

Mechanical Properties:

Physical PropertiesMetricEnglishComments
Density8.75 g/cc0.316 lb/in³
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell B79 – 8879 – 88
Tensile Strength, Ultimate515 – 585 MPa74700 – 84800 psi
Tensile Strength, Yield345 – 515 MPa
@Strain 0.200 %
50000 – 74700 psi
@Strain 0.200 %
Elongation at Break8.0 – 15 %8.0 – 15 %In 50 mm
Modulus of Elasticity125 – 130 GPa18100 – 18900 ksi
Fatigue Strength205 – 240 MPa29700 – 34800 psi
Machinability40.0 %40.0 %
Electrical PropertiesMetricEnglishComments
Electrical Resistivity<= 0.00000287 ohm-cm<= 0.00000287 ohm-cm
Thermal PropertiesMetricEnglishComments
CTE, linear17.6 µm/m-°C
@Temperature 20.0 – 200 °C
9.78 µin/in-°F
@Temperature 68.0 – 392 °F
Specific Heat Capacity0.420 J/g-°C0.100 BTU/lb-°F
Thermal Conductivity17.3 W/m-K120 BTU-in/hr-ft²-°F
Melting Point1030 – 1070 °C1890 – 1960 °F
Solidus1030 °C1890 °F
Liquidus1070 °C1960 °F
Processing PropertiesMetricEnglishComments
Processing Temperature980 °C1800 °FHot-Shortness Temperature
Solution Temperature900 – 925 °C1650 – 1700 °FLarge sections, 1 hour per inch or fraction of an inch
900 – 955 °C1650 – 1750 °F10 minutes, water quench
Ageing Temperature425 °C797 °F3-6 hours, for maximum strength
470 – 495 °C878 – 923 °FCommercial practice, 2-3 hours
Hot-Working Temperature700 – 925 °C1290 – 1700 °F
Precipitation Temperature>= 482 °C
@Time 7200 sec
>= 900 °F
@Time 2.00 hour
Air

 

Available Forms: 
Bar, rod, round bar, solid bar, hollow bar, pipe, Flat bars, square bars, rectangular bars, hexagonal bars, and Customized shapes are available upon request.
Strip: ASTM B 534-07, MILITARY MIL-C-81021, B 888
Sheet: ASTM B 534-07, B 888
Rod: ASTM B 441-04, ASTM B 534, SAE J463, J461, BS 2872, BS 2874
Tube: ASTM B 937, SAE J463, J461
Profile: ASTM B 870-08, SAE J463, J461, BS 2874
Forgings: ASTM B 870-08, ASTM B 938, BS 2872

Applications:
Fuse clips, fasteners, switch and relay parts, electrical conductors, welding equipment, Corrosion-resistant components, Electrical connectors, Precision screw machined parts, Bearings, Plastic moulds, Current-carrying springs, and Welding electrodes.