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Special Metals NILO® Alloy 42 Controlled-Expansion Alloy

Category Metal , Superalloy , Iron Base
Manufacturer Special Metals (includes the former Inco Alloys International Inc.)
Trade Name NILO®
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Special Metals NILO® Alloy 42 Controlled-Expansion Alloy.pdf
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Material Notes:
Inflection point 370°C. 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 are tube, sheet, strip, and wire.Data provided by the manufacturer, Special Metals.
Physical Properties Metric English Comments
Density 8.11 g/cc
0.293 lb/in³
Mechanical Properties Metric English Comments
Tensile Strength, Ultimate 490 MPa
71100 psi
Annealed prior to test
430 MPa

@Temperature 300 °C
 62400 psi

@Temperature 572 °F
 Annealed prior to test
Tensile Strength, Yield 250 MPa

@Strain 0.200 %
 36300 psi

@Strain 0.200 %
 Annealed prior to test
120 MPa

@Strain 0.200 %,
Temperature 300 °C
 17400 psi

@Strain 0.200 %,
Temperature 572 °F
 Annealed prior to test
Elongation at Break 42 %
42 %
Annealed prior to test.
42 %

@Temperature 300 °C
 42 %

@Temperature 572 °F
 Annealed prior to test.
Thermal Properties Metric English Comments
CTE, linear 5.30 µm/m-°C

@Temperature 20.0 - 100 °C
 2.94 µin/in-°F

@Temperature 68.0 - 212 °F
4.50 - 6.50 µm/m-°C

@Temperature 20.0 - 300 °C
 2.50 - 3.61 µin/in-°F

@Temperature 68.0 - 572 °F
Thermal Conductivity 10.5 W/m-K
72.9 BTU-in/hr-ft²-°F
Melting Point 1435 °C
2615 °F
Component Elements Properties Metric English Comments
Aluminum, Al <= 0.15 %
<= 0.15 %
Carbon, C <= 0.050 %
<= 0.050 %
Chromium, Cr <= 0.25 %
<= 0.25 %
Cobalt, Co <= 1.0 %
<= 1.0 %
Iron, Fe 55 %
55 %
As remainder
Manganese, Mn <= 0.80 %
<= 0.80 %
Nickel, Ni 42 %
42 %
nominal; adjustable to meet expansion requirements
Phosphorous, P <= 0.025 %
<= 0.025 %
Silicon, Si <= 0.30 %
<= 0.30 %
Sulfur, S <= 0.025 %
<= 0.025 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.0000610 ohm-cm
0.0000610 ohm-cm
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