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KOVAR

Find below the search results for the material you've specified. Please note here this information is NOT to be used for design purposes, and in no event shall MSO be liable for any damages arising from the misuse of this information

Super Alloy KOVAR(tm)

Related Metals:

Rodar(tm)
Telcoseal(tm)
Sealvar(tm)
Alloy 29-17(tm)
Nilo K(tm)
Dilver(tm)
Pernifer 29-18(tm)                                    

Specifications:

AMS 7726
AMS 7727
AMS 7728
ASTM F15
MIL I-23011 Class 1
UNS K94610

Chemistry Data

Carbon

0.02 max

Cobalt

Iron

Balance

Manganese

Nickel

Silicon

General Information

Principal Design Features

Kovar is an iron based alloy with nickel and cobalt. The chemistry is closely controlled so as to result in low, uniform, thermal expansion characteristic for the alloy.


Applications

One of the primary uses for this alloy is for glass sealing of metal components, or lead wires, into hard glass or ceramic devices. It also finds use in applications where low expansion with temperature change is a desired characteristic, such as integra


Machinability

The alloy is machinable by standard methods.


Forming

Ductility is good and thus forming may be done by conventional methods.


Corrosion Resistance

No data -- this is not intended as an alloy for applications involving corrosive media.


Welding

Welding may be done with any of the conventional methods.


Heat Treatment

See "Annealing".


Forging

No data. However the alloy is ductile and would be forgeable.


Hot Working

No data. However the alloy would have good hot ductility and could be hot formed.


Cold Working

Readily cold worked by conventional means.


Annealing

Anneal, if necessary, at 2000 F and air cool. Note that annealing after cold working may affect end product thermal expansion characteristics. To restore to original condition in regard to thermal expansion follow the following annealing practice: Anneal in hydrogen atmosphere at 1650 F for one hour. Then raise temperature to 2010 F and hold for 15 minutes followed by cooling to room temperature within one hour.


Hardening

Not applicable.


Other Physical Props

Thermal expansion from Room Temp. to Temperature shown: 212 F 3.25 400 F 2.89 572 F 2.85 750 F 2.81 1100 F 4.34 1300 F 5.06 1475 F 5.73


Physical Data

Density (lb / cu. in.)

0.302

Specific Gravity

8.36

Specific Heat (Btu/lb/Deg F - [32-212 Deg F])

0.12

Electrical Resistivity (microhm-cm (at 68 Deg F))

294

Melting Point (Deg F)

2640

Thermal Conductivity

120

Mean Coeff Thermal Expansion

3.25

Modulus of Elasticity Tension

20

Mechanical Data

Form

Sheet

Condition

Test Specimen Annealed

Temper

70

Tensile Strength

75

Yield Strength

42

Elongation

25

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