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ohmalloy insulated heater wire

Expansion Alloy Wire

Expansion alloy ( Widely known as Kovar or Invar alloy) having a specific coefficient of thermal expansion,  also it has  good sealing properties, weldability, corrosion resistance, workability and ease of machinability, and within the temperature range is not allowed to cause expansion characteristics significant changes in the phase transition.

Expansion alloys in the manufacturing process must be accurate control of chemical composition of the alloy, and its products can include rod, sheet, strip, wire and tube.


OHMALLOY can provide the expansion alloy in wire form and the following grade:


1. Chemical composition(%)

Grade

C

Si

Mn

P

S

Ni

Co

Fe

4J29

0.015

0.12

0.25

0.006

0.005

29.10

17.3

Bal

4J33

0.03

0.12

0.26

0.006

0.005

33.1

14.5

Bal

4J42

0.03

0.12

0.50

0.006

0.005

41.7

0.05

Bal

4J50

0.03

0.12

0.50

0.006

0.005

50

1.0

Bal


2. Physical properties



Grade



Density(g/cm3)

Thermal expansion coefficient (10-6/℃)


Curie point(℃)


Volume resistivity(μΩ.cm)


Thermal conductivity(W/m. ℃)

4J29

8.17

5.0(20~300℃)

5.2(20~450℃

430

46(20℃)

20.3

4J33

8.16

6.4(20~400℃)

6.9(20~500℃

440

44(20℃)

18.6

4J42

8.14

4.8(20~300℃)

6.9(20~450℃)

350

62(20℃)

15.5

4J50

8.21

9.4(20~400℃)

9.7(20~500℃)

500

44(20℃)

16.7


OHMALLOY can make the wire from dia 0.05mm to 8mm. The rod dia from 8mm to 200mm.






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