Engineered metals
for precision industries

Data sheet - CuNi12Zn25Pb

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CuNi12Zn25Pb
MAILLECHORT Pb

Cu60-63 Ni11-13 Zn reste Pb0.5-1.5

Chemical composition

Cu60-63

Ni11-13

ZnBAL

Pb0.5-1.5

Sn0.2 max

Fe0.3 max

Mn0.5 max

Other0.2 max

Alloy name
RLSA no.	490
EN standard	CW404J
DIN standard	CuNi12Zn25Pb1
UNS no.*	C79200

*Unified Numbering System (USA)

Characteristics and main uses

CuNi12Zn25Pb is a nickel-silver alloy containing 12% nickel and 25% zinc. The addition of lead makes it suitable for machining operations. It also has good stamping properties and good corrosion resistance.

Main uses

Deep drawn parts, Tableware, Security keys, Cutlery, Watch movement parts

Physical properties		Units
Density (20°C)	8,67	Kg/dm³
Melting point	1020	°C
Longitudinal elasticity modulus	130	GPa
Thermal conductivity		W/m·K
Electrical conductivity	>4.35	m/Ω·mm²
Electrical resistivity	<0.23	µΩ·m
Linear expansion Coefficient	16	10⁻⁶·K⁻¹
IACS (International Annealed Copper Standard)	>7.5	%
Poisson's ratio	0,34

Capabilities
Corrosion resistance	4
Hot deformation	1
Cold deformation	3
Electrodepositing
Diamond cutting
Nitriding
Mechanical polishing	3
Welding without filler	1
Brazing	2

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

Heat Treatment / Hardening
Annealing temperature	550-750	°C
Temperature for stress relief treatment	450	°C
Hardening temperature		°C
Hardening treatment time		hour(s)

Alloy mechanical properties

CuNi12Zn25Pb
Possible hardness range	100 - 230	HV
Possible Rm range	480 - 800	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
H110	EN1652 (1997)	110 - 140
H130	EN1652 (1997)	130 - 160
H155	EN1652 (1997)	155 - 185
H180	EN1652 (1997)	180 - 200
H200	EN1652 (1997)	≥ 200
R380	EN1652 (1997)		380 - 470	≥ 260	(≥ 15)	50
R460	EN1652 (1997)		460 - 540	≥ 320	(≥ 6)	50
R530	EN1652 (1997)		530 - 610	≥ 420	(≥ 3)	50
R620	EN1652 (1997)		620 - 700	≥ 530
R700	EN1652 (1997)		≥ 700	≥ 630

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

Engineered metals for precision industries