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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 |
Modulus 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 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.
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