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Controlled Expansion Alloys: Physical and Mechanical Properties

 

Controlled Expansion Alloys Physical Properties

Alloy

 

Invar

Kovar

Alloy 52

Alloy 48

Alloy 46

Alloy 42

Alloy 42-6

Density

lb/cu in

0.291

0.302

0.3

0.298

0.295

0.293

0.293

Specific Gravity

 

8.05

8.36

8.3

8.25

8.17

8.12

8.12

Curie Temp

°F

535

815

986

880

860

716

560

 

°C

279

435

530

471

460

380

293

Melting Point

°F

2600

2640

2600

2600

2600

2600

2600

 

°C

1427

1449

1427

1427

1427

1427

1427

Electrical Resistivity

Micro-ohm-cm

84

49

44

49

47

68

97

 

ohm-cir mil/ft

495

294

258

290

277

400

570

Thermal Conductivity

W/cm °C

0.10

0.17

0.14

0.13

0.11

0.11

0.13

 

BTU-in/sq. ft-hr-

72.6

120

97

90

79.2

74.5

87

Specific Heat

Cal/g- °C

0.12

0.11

0.12

0.12

0.12

0.12

0.12

 

BTU/lbm- °F

0.12

0.11

0.12

0.12

0.12

0.12

0.12

Thermal Expansion

ppm / °F (75°F to 842°F)

4.9

2.9

5.5

5.0

4.4

3.9

5.9

 

ppm / °C (25°C to 450°C)

8.9

5.3

9.9

9.0

7.9

7.0

10.6

 

 

Controlled Expansion Alloys Mechanical Properties

Alloy

 

Invar

Kovar

Alloy 52

Alloy 48

Alloy 46

Alloy 42

Alloy 42-6

Tensile Strength

ksi

75

75

80

79

80

82

80

 

MPa

518

518

552

545

552

566

552

Yield Strength

ksi

40

40

40

36

35

34

40

 

MPa

276

276

276

248

242

235

276

Elongation

% in 2 in.

34

30

35

30

30

30

30

Typical Hardness Ann.

Rockwell HRB

80

80

80

80

80

80

80

Modules of Elasticity

Mpsi

20.5

30

23

23

23

21.5

23

 

kMPa

141

207

159

159

159

148

159

 

Controlled Expansion Alloys Chemistry

maximum % unless noted

Alloy

Invar

Kovar

Alloy 52

Alloy 48

Alloy 46

Alloy 42

Alloy 42-6

Iron

Bal

Bal

Bal

Bal

Bal

Bal

Bal

Nominal Nickel

36

29

50.5

48

46

41

42

Nominal Cobalt

0.5

17

--

--

--

--

--

Carbon

0.05

0.02

0.05

0.05

0.05

0.05

0.07

Silicon

0.40

0.20

0.30

0.30

0.30

0.30

--

Sulfur

0.015

--

0.025

0.025

0.025

0.025

0.025

Chromium

0.25

0.20

0.025

0.025

0.025

0.025

5.6 nom.

 

 

Controlled Expansion Alloys Specifications

Alloy

Invar

Kovar

Alloy 52

Alloy 48

Alloy 46

Alloy 42

Alloy 42-6

UNS

K93601

K94610, K94630

N14052

K94800

K94600

K94100

K94760

ASTM

A-658, B-753

F-15, F-1466

F-30

F-30

F-30

F-30

F-31

Military

Mil-I-23011C Class 7

Mil-I-23011C Class 1

Mil-I-23011C Class 1

Mil-I-23011C Class 3

Mil-I-23011C Class4

Mil-I-23011C Class 5

Mil-I-23011C Class 6

AMS

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7726B, 7727, 7728C

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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