Invar4j36

Model NO.
4J36
Origin
China
Production Capacity
300t/Year
Reference Price
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Product Description

Invar

Invar

Ualloy-4J36 (Expansion alloy)

(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)
Ualloy-4J36 ( Invar ), also known generically as FeNi36 (64FeNi in the US), is a nickel-iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α).

Ualloy-4J36 (Invar) is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep gauges, television shadow-mask frames, valves in motors, and antimagnetic watches. In land surveying, when first-order (high-precision) elevation leveling is to be performed, the Level staff (leveling rod) used is made of Invar, instead of wood, fiberglass, or other metals. Invar struts were used in some pistons to limit their thermal expansion inside their cylinders.

Normal composition%

Ni

35~37.0

Fe

Bal.

Co

-

Si

≤0.3

Mo

-

Cu

-

Cr

-

Mn

0.2~0.6

C

≤0.05

P

≤0.02

S

≤0.02

 

 

 

Typical Physical properties

Density (g/cm3)

8.1

Electrical resistivity at 20 ºC (OHM* mm2/m)

0.78

Temperature factor of resistivity ( 20 ºC ~200 ºC ) X10-6/ ºC

3.7~3.9

Thermal conductivity, λ/ W/(m*ºC)

11

Curie point  Tc/  ºC

230

Elastic Modulus,  E/ Gpa

144

 

 

 

Coefficient of expansion


θ/ºC

α1/10-6ºC-1

θ/ºC

α1/10-6ºC-1

20~-60

1.8

20~250

3.6

20~-40

1.8

20~300

5.2

20~-20

1.6

20~350

6.5

20~ - 0

1.6

20~400

7.8

20~50

1.1

20~450

8.9

20~100

1.4

20~500

9.7

20~150

1.9

20~550

10.4

20~200

2.5

20~600

11.0

 

Typical Mechanical properties

Tensile Strength

Elongation

Mpa

%

641

14

689

9

731

8

Temperature factor of resistivity


Temperature range, ºC

20~50

20~100

20~200

20~300

20~400

aR/ 103 *ºC

1.8

1.7

1.4

1.2

1.0

The heat treatment process

Annealing for stress relief

Heated to 530~550ºC and hold 1~2 h. Cold down

annealing

In order to eliminate hardening, which be bring out in cold-rolled, cold drawing process. Annealing needs heated to 830~880ºC in vacuum,hold 30 min.

The stabilization process

  1. In protective media and heated to 830 ºC, hold 20min. ~ 1h, quench
  2. Due to the stress generated by quenching, heated to 315ºC,hold 1~4h.

Precautions

  1. Can not be hardened by heat treatment
  2. Surface treatment can be sandblasting, polishing or pickling.
  3. Alloy can be used 25% hydrochloric acid pickling solution at 70 ºC to clear oxidized surface

 

Style of supply


Alloys Name

Type

Dimension

 

Ualloy-4J29

Wire

D= 0.1~8mm

 

Ualloy-4J29

Strip

W= 5~250mm

T= 0.1mm

Ualloy-4J29

Foil

W= 10~100mm

T= 0.01~0.1

Ualloy-4J29

Bar

Dia= 8~100mm

L= 50~1000

 

Alloy