INVAR 36

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.

Chemistry

 NiFeMoCCuMnSiPSCr
MIN 35.0 - - - - - - - - -
MAX 37.0 Balance 0.5 0.1 0.5 0.6 0.35 0.025 0.025 0.5

Specifications

AFNOR NF A54-301 (chemistry only)
ASTM F 1684-06
EN 1.3912
UNS K93600, UNS K93603
Werkstoff 1.3912

Inventory

INVAR 36 Plate, INVAR 36 Welding Products

Common Trade Names

Nilo 36

Features

  • Low expansion rate up to 500°F
  • Readily weldable

Applications

  • Tooling and dies for composite forming
  • Cryogenic components
  • Laser components

Physical Properties

Density: 0.293 lb/in3
Melting Point: 2605°
Electrical Conductivity: 69.3 Btu • ft/ ft² • hr • °F

Density: 0.293 lb/in3Melting Point: 2605°Electrical Conductivity: 69.3 Btu • ft/ ft² • hr • °F* 70°F to indicated temperatures.

Temperature, °F -328 -148 212 302 392 482 572 662 752 842 932
Modulus of Elasticity, Dynamic psi x 106 0.8 0.7 0.8 1.1 1.4 1.9 3.1 4.0 4.7 5.2 5.6
Modulus of Elasticity, Dynamic psi x 106 0.8 0.7 0.8 1.1 1.4 1.9 3.1 4.0 4.7 5.2 5.6

* 70°F to indicated temperature.

Mechanical Properties

Typical Tensile Properties

Temperature,°F 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