Invar 36
Invar 36 Alloy
What is Invar 36?
INVAR 36, also known as FeNi36, is a nickel-iron alloy with a low coefficient of expansion, containing 36% nickel. It maintains consistent dimensions across normal atmospheric temperatures and exhibits low expansion from cryogenic temperatures up to approximately 500°F (260°C). This alloy retains strength and toughness even at cryogenic temperatures, making it ideal for various applications such as standards of length, measuring devices, laser components, bi-metal thermostat strips, thermostat rods, and tanks and piping for storing and transporting liquefied gases.
For optimal performance in applications involving a wide temperature range, fully annealed material is recommended. Annealing at 850-900°C (1560-1650°F) for a suitable duration, with slow cooling, is preferred. For devices requiring maximum dimensional stability within normal ambient temperatures, a specific heat treatment process is advised: heating to 830°C (1525°F) for 30 minutes followed by water quenching, then re-heating to 300°C (570°F) for 1 hour with air cooling, and finally re-heating to 100°C (212°F) for 48 hours with air cooling. This treatment ensures full stability at temperatures up to 100°C (212°F). Protective atmospheres should be employed during preheating or annealing processes.
Invar 36 Standards
ASTM B388
ASTM B753
Invar 36 Chemical Composition
Invar 36 Data Sheet
Invar 36 Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN | OR |
Alloy 36 | 1.3912 | K93600 | – | – | – | – | – | – |
Invar 36 Mechanical Properties
Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
8.05 g/cm3 | 1427 °C | 490Mpa | 240Mpa | 42% |
Invar 36 Applications
Invar 36 Related Resources
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