ASTM F15, Nilo-K, UNS K94610 (FeNi29Co17), Chinese 4J29 kovar sheet/bar

Specifications: ASTM F15; DIN 17745; S.E.W. 385; Werkstoff Nr. 1.3981; AFNOR NF A54-301

Products Details

Kovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties. Extensive quality controls are employed in the manufacture of this alloy to ensure uniform physical and mechanical properties for ease in deep drawing, stamping and machining.Kovar alloy has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials. This alloy has found wide application in power tubes, microwave tubes, transistors and diodes. In intergrated circuits, it has been used for the flat pack and the dual-in-line package.

C

P

S

Mn

Si

Cu

Cr

Mo

Ni

Co

Fe

Not more than≤

0.03

0.020

0.020

0.5

0.30

0.20

0.20

0.20

28.5-29.5

16.8-17.8

balance

The following are the average coefficient of expansion properties after annealing in hydrogen for 1 hr at 1650°F (900°C) and 15 minutes at 2010°F (1099°C) and cooled to room temperature within 1 hr. Material heat treated using this procedure should not exhibit any transformation when cooled to -112°F (-80°C) for 4 hrs. This was determined by means of metallographic examination.

Temp Range 77°F to

Coefficient 10-6/°F

Temp Range 25°C to

Coefficient 10-6/°C

ASTM F15 CTE* 30°C to

µm/m • °C

212°F

3.25

100°C

5.86

392°F

2.89

200°C

5.20

572°F

2.85

300°C

5.13

662°F

2.72

350°C

4.89

752°F

2.81

400°C

5.06

400°C

4.60 to 5.20*

842°F

2.92

450°C

5.25

450°C

5.10 to 5.50*

932°F

3.41

500°C

6.15

1112°F

4.34

600°C

7.80

1292°F

5.06

700°C

9.12

1472°F

5.73

800°C

10.31

1652°F

6.25

900°C

11.26

Density lb/cu in 0.302
Specific Gravity   8.36
Curie Temp °F 815
  °C 435
Melting Point °F 2640
  °C 1450
Electrical Resistivity (70°F) ohm-cir mil/ft 294
  microhm-cm 49
Thermal Conductivity BTU-in/sq. ft-hr-°F 120
  W/cm °C 0.17
Specific Heat Cal/gm °C 0.11
  BTU/lbm- °F 0.11

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