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4J6 Controlled-Expansion Alloy
Overview of 4J6 Controlled-Expansion Alloy
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4J6 has the similar linear expansion coefficent with glass in a range of temperature. Similar alloy's names in different trademark systems:

Beiye

China Standard

America

Germany

France

Japan


4J6

Class6

Sylvania 4

Sealmet 4

Carpanter 426

ASTM F31

Vacovit

Nicr 426

ASV

NF A54-301

Fe-Ni 426Cr

NRS1

SNC

NCK

426

EMAS-1002



kovar thermal expansion

The Typical Applications of This Alloy are

  • Sealing alloys for soft glass or ceramics

  • Electron-beam tube

  • Receiving tube


Typical Chemical Composition in Percent


Ni

41.5~42.5

Fe

bal.

Cr

5.5~6.3





Typical Linear Expansion Coefficient


25℃-300℃

7.6~8.3

25℃-400℃

9.5~10.2 (α, 10-6-1)



Typical Mechanical Properties


Tensile Strength

Soft

Hard


<590 MPa (85.6 ksi)

>720 Mpa (104.4 ksi)

Gain Size

Deep-drawing State: ≥Level 7




Typical Physical Properties

Density

8.15 g/cm3 (0.294 lb/in3)

Resistivity

92 µΩ•cm

Thermal conduction

13 W/K

Elastic modulus

150 Gpa



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