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CUNI3SI Nickel Silicon Bronze

CuNi3Si Nickel Silicon Bronze is a heat treatable Nickel Silicon Bronze alloy. It has very high mechanical strength, good wear and corrosion resistance in both marine and industrial conditions.

It is famous for its good anti-friction properties and is extensively used for plunger tips for die casting machines connectors, possessing high electrical and thermal conductivity with very good notch ductility.

Typical Uses for CuNi3Si Nickel Silicon Bronze:

RAILWAY INDUSTRY: valve guides, bearing cages

AEROSPACE INDUSTRY: short-circuit rings, rotors anti-friction rings, insert for plastic injection molds

CuNi3Si – UNS.C70320 Nickel Silicon Bronze Alloys, which is an age-hardening alloy, higher alloyed in comparison with CuNi2Si, has higher contents of nickel and silicon in order to be able to adjust a particularly higher strength. It has an a-structure with very fine precipitations and recommends itself both for lead frames which require a high rigidity of the pins and for connector with high demands on the electrical conductivity, strength and relaxation behavior.

Typical Application for C70320 Nickel Silicon Bronze Alloys

Electrical : Resistance Welding Electrodes, Motor Rotor Bar, And Resistance Welding Tips.
Fastener : Fastener parts
Industrial : Brazing Rod, Welding Rod

Available Sizes:
Custom Diameter & Sizes, Random Mill lengths

Available Products (forms):
Round bars, Flat bars, Square bars, Rectangular bars, Hexagon bars
Custom shapes are available upon request.

Chemical Composition:

Ni: 2.50-3.50%
Si: 0.60-1.10%
Fe: 0.10% Max.
Zn: 0.50% Max.
Cu: Balance
Note: Copper plus additions equal 99.50% minimum.

Typical Physical Properties:

Specific Gravity: 8.80-8.90 g/cm3
Coefficient of Thermal Expansion per °C: 17 x 10-6 /K (20-300°C)
Electrical Conductivity (% IACS): 38 (22 Ms/m)
Thermal Conductivity (W/mk): 190
Modulus of Elasticity (10 3 MPA): 135

Note:
1). the units are based upon US Customary.
2). the typical physical properties apply to age hardened products.

International Specification:

Rods/Bars/Plates/Sheets: UNS.C70320, RWMA Class 3

European Standards: CuNi3Si, DIN 2.0855, CW112C to EN

Note:
ASTM: American Society for Testing and Materials
RWMA: Resistance Welder Manufacturers' Association
Note: Unless otherwise specified, material will be produced to DIN & RWMA.

Mechanical Properties:

The detailed Mechanical Properties will be available on request from customers.

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