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) Fe Al Be Co Si
(1) Cu value includes Ag.(2) Cu + Sum of Named Elements 99.5% min.
Min (%) 0.4 2.4
Max (%) Rem 0.10 0.20 0.7 2.7 0.20

Mechanical Properties:

Physical Properties Metric English Comments
Density 8.75 g/cc 0.316 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell B 79 – 88 79 – 88
Tensile Strength, Ultimate 515 – 585 MPa 74700 – 84800 psi
Tensile Strength, Yield 345 – 515 MPa
@Strain 0.200 %		 50000 – 74700 psi
@Strain 0.200 %
Elongation at Break 8.0 – 15 % 8.0 – 15 % In 50 mm
Modulus of Elasticity 125 – 130 GPa 18100 – 18900 ksi
Fatigue Strength 205 – 240 MPa 29700 – 34800 psi
Machinability 40.0 % 40.0 %
Electrical Properties Metric English Comments
Electrical Resistivity <= 0.00000287 ohm-cm <= 0.00000287 ohm-cm
Thermal Properties Metric English Comments
CTE, linear 17.6 µm/m-°C
@Temperature 20.0 – 200 °C		 9.78 µin/in-°F
@Temperature 68.0 – 392 °F
Specific Heat Capacity 0.420 J/g-°C 0.100 BTU/lb-°F
Thermal Conductivity 17.3 W/m-K 120 BTU-in/hr-ft²-°F
Melting Point 1030 – 1070 °C 1890 – 1960 °F
Solidus 1030 °C 1890 °F
Liquidus 1070 °C 1960 °F
Processing Properties Metric English Comments
Processing Temperature 980 °C 1800 °F Hot-Shortness Temperature
Solution Temperature 900 – 925 °C 1650 – 1700 °F Large sections, 1 hour per inch or fraction of an inch
900 – 955 °C 1650 – 1750 °F 10 minutes, water quench
Ageing Temperature 425 °C 797 °F 3-6 hours, for maximum strength
470 – 495 °C 878 – 923 °F Commercial practice, 2-3 hours
Hot-Working Temperature 700 – 925 °C 1290 – 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.