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Data sheet - CuNi18Zn27

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K65
L49
S23
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CuNi18Zn27
MAILLECHORT

Cu53-56 Ni17-19 Zn reste Pb0.03 max

Chemical composition

Cu53-56

Ni17-19

ZnBAL

Pb0.03 max

Sn0.03 max

Fe0.3 max

Mn0.5 max

Other0.2 max

Alloy name
RLSA no.455
EN standardCW410J
DIN standard2.0742
UNS no.*C77000

*Unified Numbering System (USA)

Characteristics and main uses

CuNi18Zn27 is a nickel-silver alloy, alloyed with 18% nickel and 27% zinc. It exhibits good work hardening properties, resists tarnishing and has particularly good spring properties. Like all copper materials, copper-nickel-zinc alloys show no tendency to embrittlement at low temperatures. The corrosion resistance of nickel silver is much better than that of binary copper-zinc alloys. CuNi18Zn27 is insensitive to stress corrosion cracking. CuNi18Zn27 is used for contact springs in relays, shields and jewelry.

Main uses

Coins, Caps for crystals, Electromagnetic shielding, Deep drawn parts, Tableware, Security keys, Cutlery, Contact springs, Connectors, Relay springs and Electrical contacts

Physical properties Units
Density (20°C) 8,70 Kg/dm³
Melting point 1040-1090 °C
Longitudinal elasticity modulus 140 GPa
Thermal conductivity W/m·K
Electrical conductivity >2 m/Ω·mm²
Electrical resistivity <0.5 µΩ·m
Linear expansion Coefficient 17,7 10⁻⁶·K⁻¹
IACS (International Annealed Copper Standard) 6 %
Poisson's ratio 0,34
Capabilities
Corrosion resistance4
Hot deformation1
Cold deformation4
Electrodepositing
Diamond cutting
Nitriding
Mechanical polishing4
Welding without filler2
Brazing3

1 poor | 2 average | 3 good | 4 very good | - no info

Heat Treatment / Hardening
Annealing temperature 550-750 °C
Temperature for stress relief treatment 300 °C
Hardening temperature °C
Hardening treatment time hour(s)

Alloy mechanical properties

CuNi18Zn27
Possible hardness range 80 - 250 HV
Possible Rm range 410 - 715 MPa

Non-exhaustive list of grades

Grade According to standard Hardness
(HV: Vickers)
min - max		 Rm
(MPa)
min - max		 Rp 0.2
(MPa)
min - max		 Elongation
(%) where L0 = 100mm
min - max		 L0 Grain size
(µm)
min - max
H190 EN1652 (1997) 190 - 220
H220 EN1652 (1997) 220 - 250
H090 EN1652 (1997) 90 - 120
H120 EN1652 (1997) 120 - 170
H170 EN1652 (1997) 170 - 200
R390 EN1652 (1997) 390 - 470 ≤ 280 ≥ 30 (≥ 40) 50
R470 EN1652 (1997) 470 - 540 ≥ 280 ≥ 11 (≥ 20) 50
R540 EN1652 (1997) 540 - 630 ≥ 450 (≥ 3) 50
R600 EN1652 (1997) 600 - 700 ≥ 550
R700 EN1652 (1997) 700 - 800 ≥ 660

Do not hesitate to ask us for your specific grades and parameters. We can make productions according to your needs.

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