Alloy 46

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Alloy 46

Precision Alloy 4J46,UNS K94600,(Fe-46Ni),Chinese 4J46

Usage: This alloy has a constant average linear expansion coefficient at the range of 20 °C to 500 °C. It is mainly used with 95% aluminum oxide ceramic to form air tight seal in vacuum electronics.


Grade   Chemical Composition (see Table 1) Table 1 Grade   Chemical Composition


Grade

Chemical Composition (%)

C

P

S

Mn

Si

Ni+Co+Cu

Co

Cu

Fe

4J46

0.05

0.020

0.020

0.40

0.30

45.0~46.0

5.0~6.0

3.0~4.0

Balance


Notes:

1,Under condition that the average coefficient of the linear expansion meets the requirements of the standard, the content of nickel, cobalt and copper are allowed to deviate from the stated range.

2,The shape and dimensions of the alloys are in compliance with GB/T14985.


Physical Property (see Table 2) 


Table 2 coefficient of linear expansion


Grade

Heat treatment of samples

Average coefficient of linear expansion

20~300°C

20~400°C

20~500°C

4J46

Heat to 850~900°C in a 

protective atmosphere or in vacuum 
condition, hold for 1 hour, 

and then cool to 300°C 

at a rate less than 300°C/h

5.5~6.5

5.6~6.6

7.0~8.0

Notes:

1. The Vickers hardness of the annealed strip (sheet) should be no more than 170.

2. For the unannealed strip (sheet) delivered, after heat treat at 900°C, and then hold for 30 min, the Vickers hardness should be no more than 170.


Typical Property (see Table 3—Table 6) 


Table 3 coefficient of linear expansion


Grade

Average coefficient of linear 

expansion in different temperature, ã/( 10-6/K)

20~100°C

20~200°C

20~300°C

20~400°C

20~500°C

20~600°C

4J46

6.8

6.5

6.4

6.4

7.9

9.3


Table 4 Mechanical Property


Grade

Heat treatment temperature,°C

Tensile strength, sb/MPa

Tensile stretch, δ(%)

Vickers hardness

Grain size

4J46

750

527.5

34.8

137.4

7

850

510

35.4

134.6

6

950

483.5

36.7

128.1

6~5

1050

466.5

34.3

125.6

5~4


Table 5 Magnetic Property


Grade

magnetic induction

remanent magnetic induction/ Br/T

coercivity

maxmum perameability

B10/T

Bl00/T

4J46

1.58

1.6l

0.31

2.96

55.5


Table 6 Other Propertise of the Alloy


Grade

modulus of elasticity

Resistivity

thermal conductivity200°C/[W/(m•K)]

Density/(g/cm³)

4J46

137500

0.54

20.1

8.18 

Specification: Sheet/Plate, Bar/Rod/Wire/Coil,Capillary/Pipe/Tube


Size Range:

1. Sheet---Thickness 0.1mm~3.5mm, width:≤300mm,Condition: cold rolled, bright, bright annealed

2. Plate---Thickness 3.5mm~40.0mm,width:≤300mm,Condition: cold rolled, hot rolled, annealed

3. Round Wire---Dia 0.1mm~Dia 5.0mm,Condition: cold drawn, bright, bright annealed

4. Flat Wire---Dia 0.5mm~Dia 5.0mm,length:≤1000mm,Condition:flat rolled, bright annealed

5. Bar---Dia 5.0mm~Dia 8.0mm,length:≤2000mm,Condition:cold drawn,bright, bright annealed

---Dia 8.0mm~Dia 32.0mm,length:≤2500mm,Condition:hot rolled,bright, bright annealed

---Dia 32.0mm~Dia 180.0mm,length:≤1300mm,Condition:hot forging,peeled, turned, hot treated

6. Capillary---OD 8.0mm~1.0mm,ID 0.1mm~8.0mm,length:≤2500mm,Condition: cold drawn, bright, bright annealed

7. Pipe---OD 120mm~8.0mm,ID 8.0mm~129mm,length:≤4000mm,Condition: cold drawn, bright, bright annealed