The Materials You Need When You Need Them

Super Invar (aka Super Invar 32-5)

Super Invar 32-5 is a low expansion alloy consisting of 32% Nickel, 5% Cobalt, and balance Iron. Super Invar Alloy exhibits minimum thermal expansion at room temperatures (one half of Invar Alloy), as well as thermal expansion properties less than that of Invar Alloy in the 67/203°F (-55/95°C) temperature range. The minimal expansion of Super Invar over this range of temperatures, makes this alloy useful in many applications including structural components and substrates in instrument systems requiring precision measurements.

Super Invar Products

Ed Fagan Inc. stocks Super Invar in a variety of forms and dimensions. Below are most of the standard stock form/sizes. If you do not see the size or form of Super Invar that you require, please call one of our materials experts; our sales people are very knowledgeable and can assist you. We can cut, slit, shear, or center less grind Super Invar to your exact specifications, and we also have tremendous versatility when it comes to custom sizes, packages, and unusual materials

Super Invar Rod - 0.50" - 3.50"
Super Invar Sheet - 0.039" - 0.118"
Super Invar Plate - 0.50" - 2.50"

Super Invar Applications

Optical instruments . Telescopes . Laser instruments and equipment . Ring laser gyroscopes . Laser benches . Positioning devices . Metrology devices . Structural components . Substrates in instrument systems requiring precision measurements, and other applications that require lower expansivity than Invar Alloy provides.

Super Invar Properties

Super Invar Alloy Physical Properties

Density

lb/cu in

0.294

Specific Gravity

 

8.15

Curie Temp

°F

470

 

°C

245

Melting Point

°F

2600

 

°C

1427

Electrical Resistivity

Micro-ohm-cm

82

 

ohm-cir mil/ft

481

Thermal Conductivity

W/cm °C

0.10

 

BTU-in/sq. ft-hr-

72.6

Specific Heat

Cal/g- °C

0.12

 

BTU/lbm- °F

0.12

Thermal Expansion

ppm / °F (75°F to 842°F)

4.5

 

ppm / °C (25°C to 450°C)

8.0


Super Invar Mechanical Properties

Tensile Strength

ksi

70

 

MPa

483

Yield Strength

ksi

40

 

MPa

276

Elongation

% in 2 in.

40

Typical Hardness Ann.

Rockwell HRB

75

Modules of Elasticity

Mpsi

21

 

kMPa

145


Super Invar Chemistry

maximum % unless noted

Iron

Bal

Nominal Nickel

32

Nominal Cobalt

5.0

Carbon

0.05

Silicon

0.25

Sulfur

0.015

Chromium

0.25

 

 

Super Invar Specifications

ASTM F-1684


Super Invar Alloy Linear Coefficient of Thermal Expansion

Degree C

 

Degree C

 

30-100

0.84

30-450

--

30-150

1.17

30-475

--

30-200

1.72

30-500

8.99

30-250

2.53

30-525

--

30-300

4.16

30-550

10.56

30-325

--

30-600

--

30-350

5.74

30-700

--

30-375

--

30-800

--

30-400

7.03

30-900

--

30-425

--

30-1000

--

 

ED FAGAN INC. supplies the highest quality special purpose metals and alloys for Aerospace/Aviation, Defense, Electronics, Magnetic, Medical, Lighting, Optical, Telecommunications, Ceramics, Heat Treating, and other high-technology industries.

Controlled Expansion Alloys

Ed Fagan Inc. stocks a variety of similar alloys for low expansion, controlled expansion, glass-to-metal or ceramic sealing applications that may also satisfy your needs. EFI carries:
Invar
Super Invar
Kovar
42 Alloy
46 Alloy
48 Alloy
52 Alloy

And we also have a large selection of other types of specialty metals and alloys for high technology applications, including:
Electrical/Electronic Nickel
Soft Magnetic Alloys
Refractory Metals and Alloys
Hard to Find Materials