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INVAR 36
INVAR 36 is a nickel-iron, low-expansion alloy containing 36% nickel. It maintains nearly constant dimensions over the range of normal atmospheric temperatures, and has a low coefficient of expansion from cryogenic temperatures to about 500°F. The alloy also retains good strength and toughness at cryogenic temperatures.
INVAR 36 can be hot and cold formed and machined using processes similar to austenitic stainless steels. INVAR 36 is weldable using Filler Metal CF36 which is available in bare wire for both the GTAW and GMAW process.
Specifications:
ASTM F 1684-06
EN 1.3912
UNS K93600, UNS K93603
Werkstoff 1.3912
Chemical Composition:
Ni Fe Mo C Cu Mn Si P S Cr
MIN 35.0 - - - - - - - - -
MAX 37.0 Balance 0.5 0.1 0.5 0.6 0.35 0.025 0.025 0.5
Physical Properties:
Density: 0.293 lb/in3
Melting Point: 2605°
Electrical Conductivity: 69.3 Btu • ft/ ft² • hr • °F
Density: 0.293 lb/in3
Melting Point: 2605°
Electrical Conductivity: 69.3 Btu • ft/ ft² • hr • °F
Temperature, oF -328 -148 212 302 392 482 572 662 752 842 932
Coefficient of Thermal Expansion*, 0.8 0.7 0.8 1.1 1.4 1.9 3.1 4.0 4.7 5.2 5.6
in/in oF x 10-8* 70°F to indicated temperature.
Mechanical Properties:
Temperature, oF 68 212 392 572 752 932 1112
Ultimate Tensile Strength, ksi 71 62 62 59 51 42 30
0.2% Yield Strength, ksi 35 26 16 13 13 13 11
Elongation, % 42 43 45 48 53 59 68
