MITSUBISHI MATERIALSCopper & Copper Alloy Business

MITSUBISHI MATERIALSCopper & Copper Alloy Business

Japanese

Products information

NSSeries Nickel silver

The nickel silver has a silver-white copper alloy with a beautiful color tone. Thanks to its excellence in the mechanical properties and discoloration resistance, it has been used for a variety of items such as decoration, tableware, and musical instruments from the past.

Now, it is used for electronic components such as quartz oscillator cases, switch for measuring instruments, and connectors.

Since nickel silver may become more preferable material with its excellence in characteristics in the future, as platingless copper alloy products prevails in line with the rise of social issues like environmental problems.

We manufactures the nickel silver products by hot rolling process so that we guarantee high quality of our products.

Main features

  1. It shows a silver-white color and thus gloss is very beautiful
    It shows a soft color tone unique to the copper alloy unlike the stainless steel. The silver whiteness is increased as the nickel content is increased.
  2. Good spreadability and excellent deep drawability
  3. Excellent in corrosion resistance and discoloration resistance
  4. Excellent in strength and fatigue resistance.
  5. Nonmagnetic.

Main application

  1. Quartz oscillator case, transistor cap, sliding piece for volume
  2. Clock dial, accessories, architectural, musical instruments, medical equipment, western tableware
  3. Switches, connectors, relays, and the like for electronic/ communication/ information/ electric/ measuring instruments
  4. Plating-less article (substitutes such as brass, phosphor bronze + Ni, Cr, and Sn plating)

Chemical composition

Types and representative compositions of the nickel silver are as follows.

Chemical composition

(Weight %)

Alloy Cu Ni Zn
NS2 64 17.5 Rem.
NS3 62 14 Rem.
NS4 65 10 Rem.
NS5 69 12 Rem.
NS7 65 15 Rem.
NSS 56 17.5 Rem.
NSL 70 6 Rem.
* Including inevitable impurities and trace additive elements

Physical properties

There are no big differences in the density and other physical properties of the nickel silver alloy.
The modulus of longitudinal elasticity of the nickel silver alloy is superior to C2600 (105 kN / mm2), which is very advantageous in terms of mechanical properties.

Physical properties
Property NS2 NS3 NS4 NS5 NS7 NSS NSL
Specific Gravity(293K) 8.7 8.7 8.7 8.7 8.7 8.7 8.6
Melting Point(℃) 1110 1040 1020 1070 1075 1055 1000
Electrical Conductivity
(%IACS:293K)
6 8 9 8 7 6 12.5
Thermal Conductivity
(W/(m・k):297K)
93 105 128 105 105 93 163
Coefficient of liner expansion
(×10-6/K : 293~573K)
16.2 16.2 16.4 16.2 16.2 16.2 17
Modulus of Elasticity
(kN/mm:293K)
130 126 123 125 127 130 121

Mechanical properties (Sampling direction: L.D. )

The tensile strength of NS 7 is higher about 80 N/mm2than that of C2600.

The mechanical properties of NS 7 (Representative value)
Temper G.S.
µm
Tensile Strength
N/mm2
Yield strength
N/mm2
Elongation
Hardness
HV1
Erichsen Value
mm
O 10 440 230 34.0 115 11.0
20 420 175 40.0 105 12.0
35 385 140 43.0 85 12.5
1/4H 12 450 230 33.0 120 11.0
1/2H - 500 450 14.0 160 -
H - 570 550 6.0 175 -
EH - 610 600 2.0 195 -

Stress relaxation resistance

The criteria of CES are determined based on that cracking does not occur with exposure for 72 hours.
The stress corrosion cracking resistance of various types of nickel silver sufficiently satisiesy the criteria of CES and is further superior to C2600.

Bending workability

NS 7 shows good bending characteristics, 180°of tight bending is performed with half H material, and the cracking does not occur with W bending of R/t =0.5 with H material.

Bending workability of NS 7
Temper good way bad way
adhension t/2 t adhensiont/2 t
O
1/4H
1/2H
H
EH ×

Inquiry

Rolled product Sales Dept.

TEL:+81-3-5252-4981

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