Nilo K Wires

Product Details

A nickel-iron-cobalt controlled-expansion alloy containing 29% nickel. Its coefficient of expansion, which decreases with rising temperature to the inflection point, matches the expansion rate of borosilicate glasses and alumina ceramics. Used for glass-to-metal seals in applications requiring high reliability or resistance to thermal shock. Examples include: high-power transmitting valves, transistor leads and headers, integrated-circuit lead frames and photography flash bulbs.

STANDARD PRODUCT FORMS
Tube, sheet and round bar.

MAJOR SPECIFICATIONS
UNS K94800, ASTM F 30, DIN 17745, Werkstoff Nr. 1.3922, 1.3926, 1.3927 

LIMITING CHEMICAL COMPOSITION, %
Ni ....................29 a
Fe ....................53 a
Co ....................17 a
C ..........0.04 max.
Mn .......0.50 max.
Si .........0.20 max.
Al .........0.10 max.
Cr .........0.20 max.
Mg .......0.10 max.
Zr .........0.10 max.
Ti..........0.10 max.
Cu........0.20 max.
Mo .......0.20 max.
a Nominal value; adjusted to meet expansion
requirements.

PHYSICAL CONSTANTS AND THERMAL
PROPERTIES
Density, Ib/in3
........................................................................0.295
g/cm3
.........................................................................8.16
Melting Temperature (Approximate), °F
........................2640
°C ........................1450
Inflection Point, °F
..................................................................840
°C
..................................................................450
Thermal Conductivity, Btu • in/ft2 • h • °F
...........................116
W/m • °C ..........................................16.7
Coefficient of Expansion, 68 – 212°F, 10-6
in/in • °F........3.3
20 – 100°C, µm/m • °C ............6.0
68 – 752°F, 10-6 in/in • °F ..............2.6 –
2.9
20 – 400°C, µm/m • °C ...................4.6 –
5.2
Electrical Resistivity, ohm • circ mil/ft
...............................260
µ Ω• m
..............................................0.430
TYPICAL MECHANICAL PROPERTIES
(Annealed)
Tensile Strength, ksi
..................................................................75
MPa
............................................................520
Yield Strength (0.2% Offset), ksi
...........................................49
MPa .....................................340
Elongation, %
..............................................................................42