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Beryllium Copper Strip (Strip, Plate, Rod and Wire forms)

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Overview

Beryllium Copper Strip (Strip, Plate, Rod and Wire forms)

Widely used for contact springs, these core NGK products, available as strips, plates, rods, or wire, offer an ideal combination of properties such as tensile strength, electrical conductivity, fatigue strength, thermal stability, bending formability, and corrosion resistance.

Features

Beryllium Copper is a copper alloy with the optimum combination of mechanical and physical properties such as tensile strength, fatigue strength, performance under elevated temperatures, electrical conductivity, bending formability, corrosion resistance and non-magnetic. Beryllium Copper is widely used as contact springs in various applications like connectors, switches, relays, etc. NGK offers a variety of Beryllium Copper alloys in several tempers to cover different applications. Our Beryllium Copper products are available in strip, plate, rod and wire forms.

Properties of Beryllium Copper

Tensile Strength vs. Electrical Conductivity

Tensile Strength vs. Electrical Conductivity
Note: These are typical values as measured by NGK. They do not constitute guarantees.

Chemical Composition

NGK Alloy Chemical Composition [wt%]
Alloy 25 Be
Ni+Co
Ni+Co+Fe
Cu+Be+Ni+Co+Fe		 1.80-2.00
0.20min.
0.6max.
99.5min.
Alloy 8
Alloy 11		 Be
Ni
Cu+Be+Ni		 0.20-0.60
1.40-2.20
99.5min.
Alloy 7 Be
Ni+Co
Al
Cu+Be+Ni+Co+Al		 0.20-0.40
1.80-2.50
0.6max.
99.0min.
  • *The chemical composition of beryllium copper alloys is tested using optical atomic emission spectrometry as specified by NGK. Cu is considered the remainder after subtracting other elements.

Physical Properties

Item NGK Alloy 25 NGK Alloy 8·11 NGK Alloy 7
Melting Point (solidus) [℃] 865 1004 1050
Melting Point (liquidus) [℃] 980 1070 1081
Density [g/cm3]
at 20℃		 8.36 8.82 8.71
Specific Heat [J/(kg・K)]
at 20℃		 419 419 419
Thermal Expansion Coefficient [/℃]
at 20〜300℃		 17.8×10-6 17.6×10-6 17.6×10-6
Modulus of Elasticity [kN/mm2] 127 132 127
Modulus of Rigidity [kN/mm2] 49 52 49
Poidon's Ratio 0.3 0.3 0.3
Magnetic Permeability [μ(μ=1+4πk)] 1.000042 1.000031 1.000027

Electrical conductivity and thermal conductivity * （at 20℃）

  NGK Alloy 25 NGK Alloy 8 NGK Alloy 11 NGK Alloy 7
Age Hardenable Mill hardened 8-1/2HT 8-HT 11-HT 11-SHC 7-1/2HT 7-HT 7-EHT
Thermal conductivity [W/(m・K)] 99 85 298 280 262 221 194 180 176
Electrical conductivity [%IACS] 24 21 68 64 60 51 45 42 41

Forms of Copper Beryllium Products

Strip: Range of Standard Production

Mill width coil, Slit coil, Cut to length
Mill width coil
Coil Thickness 0.05 - 2.0mm
Width max. 200mm
Cut to length Thickness 0.05 - 1.0mm
Length max. 1200 mm
  • *Please contact us for special requirement.
  • *Alloy 7 and 8 are available in standard thickness dimensions.
  • *The range may vary depending on alloy and temper.

Rod: Range of Standard Production

ProductionRound rodin
ProductionRound rodin
Diameter 1 - 120mm

Wire: Range of Standard Production

in coil, on bobbin
in coil, on bobbin
Diameter in coil 0.2 - 1.0mm
on bobbin 0.05 - 0.15mm

Technical data

Product Overview of Copper Beryllium

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Featured Articles

Proper use of Beryllium Copper

Provides in-depth data on the proper use of beryllium copper, including aging conditions, heat shrinkage, and storage.
Performance of Beryllium Copper

Provides in-depth data on beryllium copper properties, including spring properties, bending formability, thermal stability, and fatigue strength.
Laws and regulations governing beryllium copper alloy and beryllium

As alloys contain beryllium, these products may be subject to safety and environmental regulations. Read a summary of the current regulations in existence around the world and in Japan.
Introduction of Improved Beryllium Copper (less dimensional changes and variations)

Provides beryllium copper, which has improved dimensional accuracy of finished products by suppressing dimensional changes before and after heat treatment. This improvement achieved improvement of manufacturing yield, reduction of lead time and stabilization product performance.

Request a Catalog

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  • Properties (Chemical Composition, Physical Properties, Electrical conductivity and thermal conductivity etc.)
  • Test data (Tensile strength, Yield strength 0.2% offset, Elongation, Hardness etc.)
  • *Our products and industrial standards listed on this page are used for the purpose of convenience to indicate our products and their correspondence with the standards. They do not imply that the materials or our testing methods conform to or comply with the standards.

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