Product Description
A nickel-iron controlled-expansion alloy containing 48% nickel. Its coefficient of thermal expansion is designed to match that of soft lead and soda-lime glasses. The alloy also has a high inflection point. Used for glass-to-metal seals in radio valves and incandescent electric light bulbs and for industrial thermostats that operate at temperatures up to 840°F (450°C).
STANDARD PRODUCT FORMS
Wire.
MAJOR SPECIFICATIONS
UNS K94800, ASTM F 30, DIN 17745, Werkstoff Nr. 1.3922, Werkstoff Nr. 1.3922,
LIMITING CHEMICAL COMPOSITION, %
Ni .....................48 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 .........0.10 max.
Co ..........1.0 max.
aNominal value; adjusted to meet expansion requirements.
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 .........0.10 max.
Co ..........1.0 max.
aNominal value; adjusted to meet expansion requirements.
PHYSICAL CONSTANTS AND THERMAL PROPERTIES
Density, Ib/in3 ........................................................................0.296
g/cm3 .........................................................................8.20
Melting Temperature (Approximate), °F ........................2640
°C ........................1450
Inflection Point, °F ..................................................................860
°C ..................................................................460
Thermal Conductivity, Btu • in/ft2 • h • °F ...........................116
W/m • °C ..........................................16.7
Coefficient of Expansion, 68 – 212°F, 10-6 in/in • °F........4.7
20 – 100°C, µm/m • °C ............8.5
68 – 752°F, 10-6 in/in • °F ..............4.6 – 5.2
20 – 400°C, µm/m • °C ...................8.3 – 9.3
Electrical Resistivity, ohm • circ mil/ft ...............................280
µ Ω• m ..............................................0.470
g/cm3 .........................................................................8.20
Melting Temperature (Approximate), °F ........................2640
°C ........................1450
Inflection Point, °F ..................................................................860
°C ..................................................................460
Thermal Conductivity, Btu • in/ft2 • h • °F ...........................116
W/m • °C ..........................................16.7
Coefficient of Expansion, 68 – 212°F, 10-6 in/in • °F........4.7
20 – 100°C, µm/m • °C ............8.5
68 – 752°F, 10-6 in/in • °F ..............4.6 – 5.2
20 – 400°C, µm/m • °C ...................8.3 – 9.3
Electrical Resistivity, ohm • circ mil/ft ...............................280
µ Ω• m ..............................................0.470
TYPICAL MECHANICAL PROPERTIES
(Annealed)
Tensile Strength, ksi ..................................................................75
MPa ............................................................520
Yield Strength (0.2% Offset), ksi ...........................................38
MPa .....................................260
Elongation, % ..............................................................................43
Tensile Strength, ksi ..................................................................75
MPa ............................................................520
Yield Strength (0.2% Offset), ksi ...........................................38
MPa .....................................260
Elongation, % ..............................................................................43
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