Beryllium Copper Strip

Features of Beryllium Copper

(2) Chemical composition and Physical Properties

Chemical Composition

NGK AlloyChemical Composition (wt%)Major FeaturesForm
25 Be
Ni+Co
Ni+Co+Fe
Cu+Be+Ni+Co+Fe
1.80-2.00
min.0.20
max.0.60
min.99.5
High strength
High Fatigue strength
High electrical conductivity
Wear resistance
Nonmagnetic
Cold worked
Strip, Bar, Wire
Hot Worked
Plate, Rod
8·11 Be
Ni
Cu+Be+Ni
0.20-0.60
1.40-2.20
99.5min.
High electrical conductivity
High fatigue strength
High strength
Nonmagnetic
7 Be
Ni+Co
Al
Cu+Be+Ni+Co+Al
0.20-0.40
1.80-2.50
max.0.60
min.99.0
Cold worked
Strip

Physical Properties

ItemNGK Alloy 25NGK Alloy 8·11NGK Alloy 7
Melting Point (solidus) °C 865 1004 1050
Melting Point (liquidus) °C 980 1070 1081
Density g/cm3 at 20°C 8.26 8.75 8.71
Specific Heat J/(kg·K) at 20°C 419 419 419
Thermal Expansion Coefficient /°C at 20~300°C 17.8x10-6 17.6x10-6 17.6x10-6
Thermal Conductivity W/(m·K) at 20°C 83.7-130 167-260 148-194
Electrical Conductivity %IACS at 20°C 25 63·55 38
Modulus of Elasticity kN/mm2 127 132 127
Modulus of Rigidity kN/mm2 49 52 49
Poison's Ratio 0.3 0.3 0.3
Magnetic Permeability µ(µ=1+4pk) 1.000042 1.000031 1.000027

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