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|
Grade |
W. Nr. |
UNS |
Nickel Alloys |
|
Invar 36 / Alloy 36 |
1.3912 |
K93600 / K93603 |
Invar 36 / Alloy 36 is a special low-expansion alloy developed for applications where dimensional stability under temperature changes is critical. Its main advantage is minimizing dimensional change, particularly at low and moderate temperature ranges. Good ductility, formability and weldability make it suitable for precision-tolerance components. However, Invar 36 / Alloy 36 is not selected primarily for high corrosion resistance or high-temperature strength; it is mainly preferred for dimensional stability and low thermal expansion.
|
Ni % |
Fe % |
C % |
S % |
Mn % |
Si % |
Cr % |
Co % |
P % |
|
35.00 – 37.00 |
Bal. |
0.05 max. |
0.015 max. |
0.60 max. |
0.40 max. |
0.25 max. |
0.50 max. |
0.015 max. |
|
Product form |
Rp0.2, MPa |
Rm, MPa |
Elongation, % |
Hardness |
Density, g/cm³ |
|
Round bar |
270 |
490 |
40 |
≤150 HV / ≤80 HRB |
8.1 |
|
Plate |
270 |
490 |
40 |
≤150 HV / ≤80 HRB |
8.1 |
Note: Mechanical values are typical room-temperature values and may vary depending on product form, section size, annealing condition and order specification.
|
Sector / Application Area |
Products |
|
Aerospace and composite manufacturing |
Carbon fiber composite molds, autoclave tooling plates, precision tooling/fixture components |
|
Cryogenic systems and LNG |
LNG tank/membrane components, liquefied gas handling equipment, low-temperature connection and support components |
|
Electronics and semiconductor |
Semiconductor equipment parts, electronic device carriers, OLED/display production components |
|
Optical and laser systems |
Laser system housings, optical support platforms, precision adjustment/connection components |
|
Measurement, control and precision engineering |
Gauges, measuring device components, reference plates requiring dimensional stability |
|
Thermostat and bimetal applications |
Bimetal thermostat strips, thermostat rods, temperature regulator rod/tube components |
|
Space and defense |
Satellite electronic carrier frames, precision mounting plates, low-expansion support elements |
|
Industrial tooling and special machinery |
Precision machining plates, mold blocks, machine components that should not be affected by temperature changes |
Invar 36 / Alloy 36 service temperature should not be treated as a fixed maximum value, because this grade is selected for low thermal expansion and dimensional stability rather than high-temperature strength. Its low-expansion behavior is most pronounced at approximately -250 °C to +200 °C. It retains useful toughness and strength at cryogenic temperatures, which makes it suitable for low-temperature applications such as liquefied gases/LNG. Its Curie temperature is around 230 °C; above this range, the alloy’s thermal expansion behavior starts to change. Therefore, it should not be considered a high-temperature service alloy. Weldability is generally good; however, to preserve the low-expansion characteristic, clean surfaces, controlled heat input, suitable filler metal and a controlled welding procedure should be used.
Invar 36, Alloy 36, NILO 36, Pernifer 36, Fe-Ni36, Ni36, 1.3912, UNS K93600, UNS K93603
|
Product form |
ASTM |
AMS |
|
Round bar |
ASTM F1684 |
AMS-I-23011 Class 7* |
|
Plate |
ASTM F1684 / ASTM B753 |
AMS-I-23011 Class 7* |
|
Pressure vessel plate |
ASTM A658 / ASME SA-658 |
— |
*Note: AMS-I-23011 is a noncurrent SAE specification for iron-nickel alloys used for glass/ceramic sealing. For general commercial bar and plate orders, ASTM F1684 should be treated as the main reference unless AMS-I-23011 is specifically required by the customer specification.
Special Metals — NILO® alloy 36
VDM Metals — VDM® Alloy 36 / Pernifer 36
Note: The information provided in this data sheet is for informational purposes only; no liability is accepted.
