Alloy wire for electricity
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Kovar　Nickel Alloy Wire,Ribbon

Code：KOV（Kovar）

Properties and Applications

It is an iron-nickel-cobalt alloy with a low coefficient of thermal expansion near room temperature among metals, and is widely used for electron tube materials, etc., as it is suitable for sealing with hard glass and ceramics.

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Product Details

Electrical
Resistivity
[μΩm]		 Average TCR
［×10-6/℃］
0.49 ＊3500
(＊)Reference value
Thermal
Expansion
Coefficient
×10-6/		 Density
g/cm3
(20℃) 		Melting Point
℃
25～200℃ 5.2 8.24 1450
25～300℃ 5.1
25～400℃ 4.9
25～45℃ 5.3
25～500℃ 6.2
Chemical
Composition		 C Si Mn Ni Co Fe
(％) ≦0.015 ≦0.5 ≦1.0 28〜30 15.5〜17｡5 BAL
Alloys Type Diameter (mm）
KOV Wire φ5.00～0.03
Ribbon Please consult

Kovar【Resistance・Length・Weight】

〔Wire〕
Alloys Electrical
Resistivity
(23℃μΩｍ)
KOV 0.49
Diameter
(mm)		 Tolerance
(mm)		 Cross section
(mm2)		 Resistance Tolerance
(%)		 Resistance Tolerance
(Ω/ｍ)		 Length
(ｍ/Kg)		 Weight
(ｇ/ｍ)
5.00 ±0.060 19.6 ±5 0.0250 6.18 162
4.50 ±0.050 15.9 ±5 0.0308 7.63 131
4.00 ±0.050 12.6 ±5 0.0390 9.65 104
3.50 ±0.050 0.62 ±6 0.0510 12.6 79.3
3.20 ±0.040 8.04 ±6 0.0610 15.1 66.3
2.90 ±0.040 6.60 ±6 0.0742 18.4 54.5
2.60 ±0.040 5.31 ±6 0.0923 22.8 43.8
2.30 ±0.040 4.15 ±6 0.118 29.2 34.3
2.00 ±0.030 3.14 ±6 0.156 38.6 25.9
1.80 ±0.030 2.54 ±6 0.193 47.7 21.0
1.60 ±0.030 2.01 ±7 0.244 60.3 16.6
1.50 ±0.030 1.77 ±7 0.277 68.6 14.6
1.40 ±0.030 1.54 ±7 0.318 78.8 12.7
1.30 ±0.030 1.33 ±7 0.369 91.4 10.9
1.20 ±0.030 1.13 ±7 0.433 107 9.33
1.10 ±0.030 0.950 ±7 0.516 128 7.84
1.00 ±0.030 0.785 ±7 0.624 154 6.48
0.90 ±0.030 0.636 ±7 0.771 191 5.25
0.85 ±0.030 0.567 ±7 0.864 214 4.68
0.80 ±0.020 0.502 ±7 0.975 241 4.14
0.75 ±0.020 0.442 ±7 1.11 275 3.64
0.70 ±0.020 0.385 ±7 1.27 315 3.17
0.65 ±0.020 0.332 ±7 1.48 365 2.74
0.60 ±0.020 0.283 ±7 1.73 429 2.33
0.55 ±0.020 0.237 ±8 2.06 510 1.96
0.50 ±0.010 0.196 ±8 2.50 618 1.62
0.45 ±0.010 0.159 ±8 3.08 763 1.31
0.40 ±0.010 0.126 ±8 3.90 965 1.04
0.35 ±0.010 0.0962 ±8 5.10 1260 0.793
0.32 ±0.010 0.0804 ±8 6.10 1508 0.663
0.29 ±0.010 0.0660 ±8 7.42 1836 0.545
0.26 ±0.010 0.0531 ±8 9.23 2284 0.438
0.23 ±0.010 0.0415 ±8 11.8 2919 0.343
0.20 ±0.006 0.0314 ±9 15.6 3860 0.259
0.18 ±0.006 0.0254 ±9 19.3 4766 0.210
0.16 ±0.006 0.0201 ±9 24.4 6032 0.166
0.15 ±0.006 0.0177 ±9 27.7 6863 0.146
0.14 ±0.006 0.0154 ±9 31.8 7878 0.127
0.13 ±0.006 0.0133 ±9 36.9 9137 0.109
0.12 ±0.006 0.01130 ±9 43.3 10723 0.0933
0.11 ±0.006 0.00950 ±9 51.6 12761 0.0784
0.10 ±0.006 0.00785 ±9 62.4 15441 0.0648
0.09 ±0.005 0.00636 ±10 77.1 19063 0.0525
0.08 ±0.005 0.00502 ±10 97.5 24127 0.0414
0.07 ±0.005 0.00385 ±10 127 31512 0.0317
0.06 ±0.004 0.00283 ±11 173 42892 0.0233
0.05 ±0.004 0.00196 ±11 250 61764 0.0162
0.04 ±0.003 0.00126 ±12 390 96506 0.0104
0.03 ±0.003 0.000707 ±12 694 171567 0.00583
(*)Reference value

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