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Data sheet - CuNi18Zn20

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CuNi18Zn20
MAILLECHORT

Cu60-63 Ni17-19 Zn reste Pb0.03 max

Chemical composition

Cu60-63

Ni17-19

ZnBAL

Pb0.03 max

Fe0.25 max

Mn0.5 max

Alloy name
RLSA no.420
EN standardCW409J
DIN standard2.0740
UNS no.*C76400

*Unified Numbering System (USA)

Characteristics and main uses

Le CuNi18Zn20 is a nickel silver alloy alloyed with 18 % nickel and 20 % zinc. It has good cold working properties, is tarnish resistant and has very good spring properties. Like all copper materials, the copper-nickel-zinc alloys show no tendency to embrittlement at lower temperatures. The corrosion resistance of nickel silver is much better than that of binary copper-zinc alloys. CuNi18Zn20 is insensitive to stress corrosion cracking.

Main uses

Coins, Crystal Caps, Electromagnetic Shielding, Stampings, Tableware, Safety Keys, Cutlery, Contact Springs, Connectors, Jewelry, Relay Springs and Electrical Contacts

Physical properties Units
Density (20°C) 8,72 Kg/dm³
Melting point 1055-1105 °C
Longitudinal elasticity modulus 135 GPa
Thermal conductivity W/m·K
Electrical conductivity >2 m/Ω·mm²
Electrical resistivity <0.50 µΩ·m
Linear expansion Coefficient 17,7 10⁻⁶·K⁻¹
IACS (International Annealed Copper Standard) >3 %
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

CuNi18Zn20
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
G035 EN1652 (1997) ≤ 110
G020 EN1652 (1997) ≤ 120
H085 EN1652 (1997) 85 - 115
H115 EN1652 (1997) 115 - 160
H160 EN1652 (1997) 160 - 190
H180 EN1652 (1997) 180 - 210
H200 EN1652 (1997) 200 - 230
R380 EN1652 (1997) 380 - 450 ≤ 250 ≥ 27 (≥ 37) 50
R450 EN1652 (1997) 450 - 520 ≥ 250 ≥ 9 (≥ 18) 50
R500 EN1652 (1997) 500 - 590 ≥ 410 (≥ 3) 50
R580 EN1652 (1997) 580 - 670 ≥ 510
R640 EN1652 (1997) 640 - 730 ≥ 600

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

Contact us

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