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Copper – Beryllium Alloy Bars
Alloy 25
Be: 1.8 – 2.0%
Co: 0.2% min.
Co + Ni + Fe: 0.6% min.
Cu + additions: 99.5% min.
Copper – Beryllium Alloy 25, C17200 is also known as Alloy 25 and is the most commonly utilized beryllium copper alloy and is notable for exhibiting the highest strength and hardness compared to commercial copper alloys. Its strength and hardness is similar to that of steel. Copper – Beryllium Alloy 25 copper's ultimate tensile and Rockwell hardness properties in a peak aged condition are in the 200 ksi range and RC 45 respectively (electrical conductivity 22% IACS minimum).
Mechanical Properties
Grade Alloy (25)
Temper H
Tensile Strength 90-125 ksi
Tensile Strength 620-860 MPa
0.2% Yield Strength 75 ksi min
0.2% Yield Strength 520 MPa min
Elongation in 4D 8% min
Hardness Rockwell B 88-102
Electrical Conductivity 15 %IACS min
Typical Age Hardening ...
Typical Physical Properties
Density .298 lbs./in.3 ( @ 68°F)
Coefficient of Thermal Expansion 9.7 x 10-6 (68°F to 390°F)
Thermal Conductivity 60 BTU/(ft. x hr. x °F)(@ 68°F)
Electrical Conductivity 22 %IACS (@ 68oF)
Thermal Capacity (specific heat) 0.1 BTU/ (b. x °F)(@ 68°F)
Modulus of elasticity 18.5 x 106 psi
Modulus of rigidity (Torsion Modulus) 7.2 X 106 psi
Magnetic permeability 1.0025
Machinability 20
Specifications
ASTM B196, B643
Federal QQC530
AMS 4650, 4651, 4533, 4534, 4535
RWMA Class 4
CDA C17200
DIN 17666
Outstanding Characteristics: High strength, High fatigue strength, Good conductivity, non-magnetic
Typical Uses
Electrical - Contact Bridges, Clips, Spring Connectors, Current Carrying, Navigational Instruments, Relay Parts, Belleville Washers, Electrical Switch and Relay Blades, Connectors, Switch Parts, Fuse Clips
Fasteners - Bolts, Screws, Roll Pins, Retaining Rings, Lock Washers, Fasteners, Washers
Industrial - Flexible Metal Hose, Non Sparking Safety Tools, Shafts, Pump Parts, Rolling Mill Parts, Housings for Instruments, Bearings, Bushings, Valve Seats, Valve Stems, Diaphragms, Bourdon Tubes, Bellows, Wear Plates on Heavy Equipment, Springs, Welding Equipment, Spline Shafts, Valves, Pumps, Springs, Electrochemical
Ordnance - Firing Pins