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C72700 Copper Nickel Tin Wire

EN: CuNi9Sn6

UNS: C72700

Chemical composition: ASTM B740

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C72700 Copper Nickel Tin Wire
description1
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Description

Quick Detail:
UNS C72700 is a spinodal hardenable copper-nickel-tin alloy (nominal composition: Cu balance, 9% Ni, 6% Sn), widely supplied as precision wire conforming to ASTM B740 specification. It is a beryllium-free elastic copper alloy, serving as a premium alternative to beryllium copper in many electronic spring applications.

Key Characteristics & Advantages:
C72700 wire combines high elasticity, fatigue durability and corrosion resistance without beryllium. It is the preferred environmentally friendly substitute for beryllium copper wire when moderate conductivity and stable spring performance are required.

Chemical composition (wt,%)： 
Ni+Co Sn Fe Mn Pb Mg Nb Cu
8.5-9.5 5.5-6.5 ≤0.5 0.05-0.3 ＜0.02 ＜0.15 ＜0.1 Rem.





Physical and Mechanical property：
Temper Tensile Strength Yield Strength Elongation Hardness
ksi MPa Mpa min.%,4D HV0.5
TX00 - 830-980 ＞590 ＞15 ＞250
TS02 - 930-1080 ＞685 ＞10 ＞250
TS04 - ＞1060 ＞785 ＞3 ＞320

Core Applications:

    • High-speed electronic connectorsSpring wires, contact pins and signal terminals for USB4, HDMI, DisplayPort, 5G & RF connectors. Stable impedance ensures integrity of high-speed data transmission.
    • Precision contact springs & EMI shielding components
      Wire-form shielding springs, relay contacts, battery contact springs and miniature elastic terminals for consumer electronics.
    • Automotive electronics
      Wire springs for automotive high-speed connectors, sensor contacts, and electrical terminal assemblies working under vibration and temperature fluctuation.
    • Communication & optoelectronic devices
      Elastic wire components inside optical modules, filter terminals and high-frequency signal interconnection parts.
    • Instrumentation & precision machineryMiniature coil springs, probe wires, small bushing stock and wear-resistant elastic parts requiring long service life

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