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BYP2 (4J6a) Controlled-Expansion Alloy
Overview of BYP2 (4J6a) Controlled-Expansion Alloy
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BYP2 (4J6a) has the similar linear expansion coefficient with soft glasses from room temperature to 400℃, and can seal glasses well. Similar alloy's names in different trademark systems:

Beiye

China Standard

America

Germany

France

Japan

BYP2

4J6a

Class6

Sylvania 4

Sealmet 4

Carpanter 426

ASTM F31

MIL-l-23011C

Vacovit

Nicr 426

ASV

NF A54-301

Fe-Ni 426Cr

NRS1

SNC

NCK

426

EMAS-1002

Fe-42Ni-6Cr



invar thermal expansion

The Typical Applications of This Alloy are

  • Array of vacuum fluorescent display

  • Soldering terminal


Typical Chemical Composition in Percent


Ni

41.5~42.5

Fe

bal.

Cr

5.4~6.2





Typical Linear Expansion Coefficient


25℃-400℃

9.5~10.2 (α, 10-6-1)



Typical Mechanical Properties


Hardness

≥200HV



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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