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Data sheet - CuNi12Zn24

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K65
L49
S23
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CuNi12Zn24
MAILLECHORT

Cu63-66 Ni11-13 Zn reste Pb0.03 max

Chemical composition

Cu63-66

Ni11-13

ZnBAL

Pb0.03 max

Sn0.03 max

Fe0.3 max

Mn0.5 max

Other0.2 max

Alloy name
RLSA no.400
EN standardCW403J
DIN standard2.0730
UNS no.*C75700

*Unified Numbering System (USA)

Characteristics and main uses

CuNi12Zn24 is a nickel silver alloy which is alloyed with 12% nickel and 24% zinc. It is easy to cold-form and has particularly good deep-drawing 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. NB12 is insensitive to stress corrosion cracking. NB12 is used for contacts, deep drawn parts and for optical goods. This alloy is registered with U.S. EPA as antimicrobia

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) 8,67 Kg/dm³
Melting point 1020-1065 °C
Longitudinal elasticity modulus 125 GPa
Thermal conductivity W/m·K
Electrical conductivity >3 m/Ω·mm²
Electrical resistivity <0.333 µΩ·m
Linear expansion Coefficient 18 10⁻⁶·K⁻¹
IACS (International Annealed Copper Standard) >5 %
Poisson's ratio 0,32
Capabilities
Corrosion resistance4
Hot deformation1
Cold deformation4
Electrodepositing
Diamond cutting
Nitriding
Mechanical polishing4
Welding without filler2
Brazing2

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

CuNi12Zn24
Possible hardness range 80 - 230 HV
Possible Rm range 395 - 700 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) ≤ 100
G020 EN1652 (1997) ≤ 110
H080 EN1652 (1997) ≥ 80
H110 EN1652 (1997) 110 - 150
H150 EN1652 (1997) 150 - 180
H170 EN1652 (1997) 170 - 200
H190 EN1652 (1997) ≥ 190
R360 EN1652 (1997) 360 - 430 ≤ 230 ≥ 35 (≥45) 50
R430 EN1652 (1997) 430 - 510 ≥ 230 ≥ 8 (≥15) 50
R490 EN1652 (1997) 490 - 580 ≥ 400 (≥8) 50
R550 EN1652 (1997) 550 - 640 ≥ 480
R620 EN1652 (1997) ≥ 620 ≥ 580

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

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