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Invar3 Controlled Expansion Alloy

Invar3 (aka Invar 361, Pernifer 362, NILO 364, and Invar Steel) is a low expansion alloy consisting of 36% Nickel, balance Iron. Invar Alloy exhibits extremely low expansion around ambient temperatures, making Invar Alloy particularly useful in applications where minimum thermal expansion and high dimensional stability is required, such as in precision instruments like optoelectronic devices, optical and laser benches, electronics, and other kinds of scientific instruments.

Invar Products

Ed Fagan Europe Ltd. stocks 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 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 Invar to your exact specifications, and we also have tremendous versatility when it comes to custom sizes, packages, and unusual materials.

Invar Sheet

Invar Sheet Thickness

Invar Sheet Thickness

0.762 mm Invar Sheet

1.574 mm Invar Sheet

1.016 mm Invar Sheet

2.540 mm Invar Sheet

1.270 mm Invar Sheet

3.175 mm Invar Sheet

 

Invar Plate

Invar Plate Thickness

Invar Plate Thickness

3.810 mm Invar Plate

22.225 mm Invar Plate

4.749 mm Invar Plate

25.40 mm Invar Plate

6.350 mm Invar Plate

38.10 mm Invar Plate

9.525 mm Invar Plate

50.80 mm Invar Plate

12.70 mm Invar Plate

63.50 mm Invar Plate

15.875 mm Invar Plate

76.20 mm Invar Plate

19.050 mm Invar Plate

101.60 mm Invar Plate


Invar Rod

Invar Rod Diameter

Invar Rod Diameter

3.175 mm Invar Rod

28.575 mm Invar Rod

4.749 mm Invar Rod

31.750 mm Invar Rod

6.350 mm Invar Rod

38.10 mm Invar Rod

7.937 mm Invar Rod

41.275 mm Invar Rod

9.525 mm Invar Rod

44.450 mm Invar Rod

12.70 mm Invar Rod

50.80 mm Invar Rod

15.875 mm Invar Rod

57.150 mm Invar Rod

19.050 mm Invar Rod

63.50 mm Invar Rod

22.225 mm Invar Rod

76.20 mm Invar Rod

25.50 mm Invar Rod

152.40 mm Invar Rod

 

Invar Applications

Positioning devices • Bimetal thermostats • Advanced composite molds for aerospace industry • Dimensionally stable instruments and optical devices • Containers for LNG tankers • Transfer lines for LNG • Echo boxes and filters for mobile telephones • Magnetic shielding • Small electrical transformers • Precision condenser blades • Radar and microwave cavity resonators • Special electronic housings • Seals, spacers, and specialized frames • High voltage transmission lines • CRT applications: shadow masks, deflection clips, and electron gun components • Metrology devices • Scientific instruments • Electrical circuit breakers • Temperature regulators • Clock balance wheels • Pendulum clocks

Invar Properties

 

Invar Alloy Physical Properties

Density

lb/cu in

0.291

Specific Gravity

 

8.05

Curie Temp

°F

535

 

°C

279

Melting Point

°F

2600

 

°C

1427

Electrical Resistivity

Micro-ohm-cm

84

 

ohm-cir mil/ft

495

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)

4.9

 

ppm / °C (25°C to 450°C)

8.9

Invar Mechanical Properties

Tensile Strength

ksi

75

 

MPa

518

Yield Strength

ksi

40

 

MPa

276

Elongation

% in 2 in.

34

Typical Hardness Ann.

Rockwell HRB

80

Modulus of Elasticity

Mpsi

20.5

 

kMPa

141

Invar Chemistry

maximum % unless noted

Iron

Bal

Nominal Nickel

36

Nominal Cobalt

0.5

Carbon

0.05

Silicon

0.40

Sulfur

0.015

Chromium

0.25

 

 

Invar Specifications

ASTM F-1684
MIL 1-23011 CL 7

AMS 1-23011 CL 7


Invar Alloy Linear Coefficient of Thermal Expansion

Degree C

  

Degree C

  

30-100

0.8 - 1.6

30-450

8.5 - 9.2

30-150

--

30-475

--

30-200

1.3 - 2.1

30-500

9.7

30-250

--

30-525

--

30-300

4.92

30-550

--

30-325

--

30-600

11.4

30-350

6.2 - 7.0

30-700

12.7

30-375

--

30-800

13.5

30-400

7.8

30-900

13.9

30-425

--

30-1000

--

 

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

1. Trademark Carpenter Technology Corp., Reading PA
2. Trademark ThyseenKrupp-VDM, Germany
3. Trademark Imphy Alloys, France
4. Trademark Special Metals Corporation, USA

Controlled Expansion Alloys

Ed Fagan Europe Ltd. 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
Kovar
42 Alloy
42-6 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