SWISSMETAL NM3                   ~C79800                                             AVINS 

Guaranteed composition

Cu 49.0 - 50.0  Ni 7.0 - 7.7  Mn 2.4 - 3.1  Pb 2.5 - 3.0  Zn remainder

Main technological
characteristics

A nickel silver alloy offering an optimal compromise between cold forming and machining.

Delivery form

Specialties

drawn in round and profile cross sections

small diameters in rods (f max 0.590") or wires in coils or drums

Physical properties

density (68°F)

electrical conductivity

thermal conductivity

thermal capacity (specific heat)

coefficient of thermal expansion

magnetic properties

melting interval

color

0.303 lb/in³

7 %IACS

228.8 Btu.in./h.ft².°F

0.100 Btu/lb.°F

0.000011 in/in. °F

non magnetic

1670 - 1697°F

gray-silver

Capacity for
forming/machining

machinability rating (free cutting brass = 100)

tool life (free cutting brass = 110)

tendency for short chips (free cutting brass = 90)

capacity for cold working

capacity for hot working

capacity for soft soldering

capacity for hard soldering

capacity for welding

thermal stress relief

annealing

capacity for polishing

capacity for galvanic plating

good (90)

good (90)

very good (95)

good

good

good

fair

fair

570°F - 4h at temperature

1200°F - 1h at temperature

good

good

Typical mechanical
properties for wires

modulus of elasticity =  16,676,330 PSI

Corrosion resistance

stress corrosion

industrial atmosphere

rural atmosphere

marine atmosphere

chlorine (humid)

vinegar

fresh water

high relative humidity and elevated temperature

sea water

slightly sensitive

good

good

good

poor

fair

good

fair

fair-good

galvanic:

Copper alloys present a high and positive standard potential of corrosion. Consequently, there is a risk of galvanic corrosion if they enter into contact with a material of lower standard potential such as steels containing less than 13% of chromium.

Typical applications

• ball point pen tips cold formed and machined

• eyeglass components

• screws