NILO 42

NILO ALLOY 42

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Product Description

A nickel-iron controlled-expansion alloy containing 42% nickel. It has a low and nominally constant coefficient of thermal expansion from room temperature to about 570°F (300°C). Used for semiconductor lead frames in integrated circuits, bi-metal thermostat strip, thermostat rods, for ceramic-to-metal seals with alumina ceramics and various glass-to-metal seals such as: the core of copper-clad wire for sealing into glass envelopes of electric bulbs, radio valves, television tubes and fluorescent lights.
STANDARD PRODUCT FORMS
Strip, plate and wire.
MAJOR SPECIFICATIONS
UNS K94100, ASTM F 29, F 30 , DIN 385, 17745 , Werkstoff Nr. 1.3917
LIMITING CHEMICAL COMPOSITION, %
Limiting
Ni .....................42 a
Fe ......Remainder
C ..........0.05 max.
Mn .......0.80 max.
P ........0.025 max.
S .......0.025 max.
Si .........0.30 max.
Cr .........0.25 max.
Al .........0.15 max.
Co ..........1.0 max.
aNominal value; adjusted to meet expansion requirements.
PHYSICAL CONSTANTS AND THERMAL PROPERTIES
Density, Ib/in3 ........................................................................0.293
g/cm3 .........................................................................8.11
Melting Temperature (Approximate), °F ........................2615
°C ........................1435
Inflection Point, °F ..................................................................700
°C ..................................................................370
Thermal Conductivity, Btu • in/ft2 • h • °F ..........................72.8
W/m • °C ..........................................10.5
Coefficient of Expansion, 68 – 212°F, 10-6 in/in • °F........2.9
20 – 100°C, µm/m • °C ............5.3
68 – 572°F, 10-6 in/in • °F ..............2.5 – 3.6
20 – 300°C, µm/m • °C ...................4.5 – 6.5
Electrical Resistivity, ohm • circ mil/ft ...............................370
µ Ω• m ..............................................0.610
TYPICAL MECHANICAL PROPERTIES
(Annealed)
Tensile Strength, ksi ..................................................................71
MPa ............................................................490
Yield Strength (0.2% Offset), ksi ...........................................36
MPa .....................................250
Elongation, % ..............................................................................43
NILO 42

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