Invar 36, also known as Nilo 36, Alloy 36, UNS K93600 & K93601, and W. Nr. 1.3912, is a nickel-iron alloy containing 36% Nickel. It is known for its low coefficient of thermal expansion from cryogenic temperatures to about +500°F (260°C). This makes it particularly useful in applications where dimensional stability is required over a wide temperature range. Invar 36 is commonly used in precision instruments, such as clocks, scientific instruments, and seismic instruments, as well as in electronic and telecommunications industry for components that require minimal expansion with temperature changes.
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sales@cocessalloys.comChemical Composition
|
Carbon (C) |
0.15 % max. |
|
Manganese (Mn) |
0.6 % max. |
|
Silicon (Si) |
0.4 % max. |
|
Phosphorus (P) |
0.025 % max. |
|
Sulfur (S) |
0.025 % max. |
|
Chromium (Cr) |
0.25 % max |
|
Nickel (Ni) |
35.0-38.0 % |
|
Cobalt (Co) |
0.5 % max. |
|
Iron (Fe) |
Balance |
Physical Properties
|
Density |
lb/in3 |
0.293 |
|
|
g/cm3 |
8.11 |
|
Melting point |
°F |
2605 |
|
|
°C |
1430 |
|
Inflection Point |
°F |
430 |
|
|
°C |
220 |
|
Thermal Conductivity at 20°C (68°F) |
|
|
|
|
Btu•in/ft²•h•°F |
69.3 |
|
|
W/m•°C |
10 |
|
Electrical Resistivity 20°C (68°F) |
|
|
|
|
ohm•circ mil/ft |
481 |
|
|
microhm-cm |
80 |
|
Expansion coefficent (10ˉ⁶/℃) |
|
|
|
|
from 20°C to 100°C |
1.5 |
|
|
from 20°C to 150°C |
2 |
|
|
from 20°C to 200°C |
2.6 |
|
|
from 20°C to 250°C |
3.5 |
|
|
from 20°C to 300°C |
5.5 |
|
|
from 20°C to 350°C |
7.2 |
|
|
from 20°C to 400°C |
8.4 |
|
|
from 20°C to 450°C |
9.3 |
|
|
from 20°C to 550°C |
10.1 |
Mechanical Properties
|
Form |
Temperature |
Tensile Strength |
Yield Strength |
Elongation on 50 mm (0.2 inch) |
Reduction of Area |
||
|
Mpa |
ksi |
MPa |
ksi |
% |
% |
||
|
Hot-rolled Bar |
Room Temperature |
490 |
71 |
240 |
35 |
42 |
70 |
Invar 36, also known as Nilo 36 or Alloy 36, finds typical applications in various industries due to its unique properties, including its low coefficient of thermal expansion. Some specific applications include:
1. Precision Instruments: Invar 36 is widely used in precision instruments such as clocks, scientific instruments, and metrology tools where dimensional stability over a wide temperature range is essential.
2. Electronic and Telecommunications Industry: It is utilized in electronic and telecommunications industry for components that require minimal expansion with temperature changes, such as in semiconductor manufacturing and telecommunications equipment.
3. Aerospace Industry: Invar 36 is used in aerospace applications, including in the construction of aircraft and aerospace instrumentation, where stability and reliability are critical.
4. Thermostats and Bimetallic Strips: It is employed in the manufacturing of thermostats, bimetallic strips, and other temperature-sensitive devices due to its low expansion characteristics.
5. Magnetic Shielding: Invar 36 is used for magnetic shielding applications in electronic devices and scientific equipment where protection from electromagnetic interference is necessary.
6. Cryogenic Applications: It is utilized in cryogenic applications due to its low thermal expansion properties, making it suitable for use in cryogenic storage tanks and systems.
Specifications for Invar 36 include the following:
Sheet, plate, strip..................................................................... ASTM B 388 & B 753
Standard product forms of Invar 36 are pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. The products are available in a wide variety of sizes. Please contact us at sales@cocessalloys.com for full information.
