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Nilo K

Nilo K*

Available in any of the 'profile options'

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.

Chemical Composition Specifications Designations Key Features Typical Applications
Element Min % Max %
Fe 53.00 nominal
Ni 29.00 nominal
Co 17.00 nominal
Mn 0.50
Si 0.20
C 0.04
Al 0.10
Mg 0.10
Zr 0.10
Ti 0.10
Cu 0.20
Cr 0.20
Mo 0.20
ASTM F15 W.NR 1.3981
UNS K94610
AWS 094
Controlled coefficient of expansion (which decreases with rising temperature to the inflection point).
Matches the expansion rate of borosilicate glasses and alumina ceramics.
Glass to metal seals in applications requiring high reliability or resistance to thermal shock, ie. high power transmitting valves
Density 8.16 g/cm³ 0.295 lb/in³
Melting Point 1450°C 2640°F
Inflection Point 450°C 840°F
Thermal Conductivity 16.7 W/m•°C 116 btu•in/ft2•h°F
Coefficient of Expansion 6.0 µm/m °C (20 - 100°C)
4.6 - 5.2 µm/m °C (20 - 400°C)
3.3 x 10-6 in/in °F (70 - 212°F)
2.6 - 2.9 x 10-6 in/in °F (70 - 752°F)
Heat Treatment of Finished Parts
The Nilo alloys are usually supplied and used in the annealed condition (residual cold work distorts the coefficients of thermal expansion).
Annealing times may vary due to section thickness.
Oxidizing time and temperature to be selected depending on required oxide thickness.
Type Temperature Time (Hr) Cooling
°C °F
Anneal 850 - 1000 1560 - 1830 0.5 Air or water
To prepare for glass to metal sealing Decarburization 900 - 1050 1650 - 1920 1 Air or water
If a metal oxide interface is required
(time and temperature depend on required oxide thickness)
Oxidize 600 - 1000 1110 - 1830 1 Air
Properties
Condition Approx. tensile strength Approx. operating temperature
N/mm² ksi °C °F
Annealed 450 - 550 65 - 80 up to +400 up to +750
Hard Drawn 700 - 900 102 - 131 up to +400 up to +750

The above tensile strength ranges are typical. If you require different please ask.

*Trade name of Special Metals Group of Companies

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