Alloy 390® UNS Number C17460
Alloy 390® by Materion Brush Performance Alloys combines the best attributes of the two separate families of commercial copper beryllium alloys, with the strength of the “high strength” Alloy 25 and the conductivity of “high conductivity” Alloy 3 and Alloy 174. In addition to the combination of high strength and conductivity, it has excellent stress relaxation resistance at elevated temperatures. Alloy 390 was specifically designed for high power applications.This alloy is proving successful in handheld communication devices for its promise of increasing battery life and reducing charging times due to its enhanced electrical conductivity. In applications where durability, power management and or harsh operating environments are of concern, its excellent fatigue strength extends product life and improves product. Alloy 390 features high conductivity, excellent stress relaxation performance, excellent resilience, and excellent fatigue strength.
Alloy 390 Markets and Applications for Alloy 390
Automotive power applications
Computer burn-in and test sockets (BiTS),
SIM card contacts; and appliance switches, relays, sensors, and controls
Alloy 390 Chemical Composition
Beryllium – 0.15 – 0.5%
Nickel – 1.0 – 1.4%
Copper - balance
Alloy 390 Physical Properties
Elastic Modulus - 20 x 106 psi (138 Gpa)
Density - 0.318 lb/in3 (38.8 g/cm3)
Poisson's Ratio - 0.3
Relative Magnetic Permeability - <1.01
Electrical Conductivity – 44 min.% IACS (25.6 min. MS/m)
Thermal Conductivity 70°F / 20°C - 128 BTU/ft•hr•°F (222 W/m•K)
Coefficient of Thermal Expansion - 9.8 ppm/°F (17.6 ppm/°C)
Specific Heat (Heat Capacity) 70°F / 20°C - 0.08 BTU/lb•°F (335 J/kg K)
Specific Heat (Heat Capacity) 200°F / 100°C - 0.091 BTU/lb•°F (381 J/kg K)
Melting Range - 1880 - 1960 °F (1030 - 1070 °C)
Mechanical properties may vary by product size, form and temper. Please see individual data sheets for values.
Available Forms, Sizes and Tolerances ofAlloy 390
Alloy 390 is available in strip form. See data sheet for sizes and tolerances.
Applicable Specifications & Standards for Alloy 390
Resources and Related links
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