Invar 36 Datasheet | Invar 36 Material Properties

Invar 36 Stands for:-

Invar 36 is a nickel-iron low-expansion alloy that contains 36% nickel. Manan Steels & Metals is a leading Invar 36 Round Bar Manufacturers in India. It has nearly constant dimensions across the normal atmospheric temperature range and a low coefficient of expansion from cryogenic temperatures to about 500°F. At cryogenic temperatures, the alloy retains good strength and toughness.

Invar 36 can be hot and cold formed and machined in the same way that austenitic stainless steels can. Filler Metal CF36, which is available in bare wire for both the GTAW and GMAW processes, can be used to weld Invar 36.

Invar 36 Datasheet

PropertyValue
NameAlloy 36 / Invar 36
TypeControlled Expansion Alloy
Chemical SignFeNi36, 64FeNi

Invar 36 Composition

SubstanceSymbol%
NickelNi36
ChromiumCr0.25
ManganeseMn0.50
SiliconSi0.25
CarbonC0.05
AluminiumAl0.10
MagnesiumMg0.10
ZirconiumZr0.10
TitaniumTi0.10
PhosphorusP0.020
SulpurS0.020
IronFeBalance

Invar 36 Thermal Expansion

Range ( °C )Value (cm/cm. C X 10(-6))
30 to 1001.18
30 to 2001.72
30 to 3004.92
30 to 3506.60
30 to 4007.82
30 to 425n/a
30 to 4508.82
30 to 5009.72
30 to 550n/a
30 to 60011.35
30 to 70012.70
30 to 80013.45
30 to 90013.85
30 to 1000n/a

Invar 36 Tensile Strength & Hardness

PropertyTensile Strength (PSI)Hardness (Rockwell B)
Annealed85,000 max70 max
1/4 Hard90,000 to 115,00078 to 83
1/2 Hard105,000 to 125,00084 to 88
Hard120,000 min

Invar 36 Material Properties

Invar 36 Chemical Composition

NiCSiMnS
35.5 – 36.50.01 max0.2 max0.2 – 0.40.002 max
PCrCoFe 
0.07 max0.15 max0.5 maxBalance 

Invar 36 Mechanical Properties

Metallurgical ConditionAnnealed, Descaled 
Yield StrengthKSI (MPa) 38(260) Max
Tensile StrengthKSI (MPa) 63(430) Max
HardnessHB135
Elongation50mm>30% (Typical 40%)

Application and Features of Invar 36

• Tooling and dies for composite forming
• Cryogenic components
• Laser components
• Readily weldable
• Low expansion rate up to 500°F

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