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ASTM F15 Iron Nickel Cobalt Kovar alloy 4J29 Tubes
Glass sealed and controlled expansion Kovar alloys * kovar alloy, ASTM F15, Nilo-K, UNS K94610 (FeNi29Co17), Chinese 4J29 *Specifications:ASTM F15; DIN 17745; S.E.W. 385; Werkstoff Nr. 1.3981; AFNOR NF A54-301
Kovar Alloy, also know as ASTM F-15, NILO K, Pernifer 2918, Rodar, and Dilvar P1 is Nickel-Iron-Cobalt, controlled expansion alloy containing 29% Nickel. It’s coefficient of expansion (which decreases with rising temperature to the inflection point), matches the expansion rate ofborosilicate glasses and aluminia ceramics. Applications include glass to metal seals in applications requiring high reliability or resistance to thermal shock, ie.high~power transmitting valves, transistor leads and heaters and photography flash bulbs.
Alloy Type
Trade Name
UNS No.
Specifications
Forms Of Supply
Rod
Strip
Wire
Sheet
Ni29Co17
Kovar
K94610
ASTM F15
√
√
√
√
FeNi36
Invar 36
K93603
ASTM 1684
√
√
√
FeNi32Co5
Super Invar 32-5
KI93500
ASTMF1684
√
√
√
FeNi27Co25
Ceramvar
F1466
ASTMF1466
√
√
√
√
FeNi42
Alloy 42
K94100
ASTM F30
√
√
√
FeNi46
Alloy 46
K94600
ASTM F30
√
√
√
FeNi48
Alloy 48
K94800
ASTMF30
√
√
√
FeNi50
Alloy 52
K95050
ASTM F30
√
√
√
√
Item
1J33
3J01
3J9
4J29
4J32
4J33
4J45
FeNi50
Invar36
C
≤0.05
≤0.05
0.22-0.26
≤0.03
≤0.05
≤0.03
≤0.05
≤0.05
≤0.1
Mn
≤0.05
≤1.00
1.80-2.20
≤0.5
0.2-0.6
≤0.5
≤0.8
≤0.8
≤0.5
Fe
Rest
P
≤0.020
≤0.020
≤0.03
≤0.02
≤0.02
≤0.02
≤0.02
≤0.02
≤0.006
S
≤0.020
≤0.020
≤0.020
≤0.02
≤0.02
≤0.02
≤0.02
≤0.02
≤0.04
Si
0.30-0.6
≤0.80
1.30-1.70
≤0.3
≤0.2
≤0.3
≤0.3
≤0.3
≤0.35
Ni
32.8-33.8
34.5-36.5
9.0-10.5
28.5-29.5
31.5-33
28.5-29.5
44.5-45.5
49.5-50.5
35-38
Al
1.0-2.0
1.00-1.80
--
--
--
--
≤0.1
≤0.1
--
Co
--
--
--
16.8-17.8
3.2-4.2
16.8-17.8
-
-
-
Ti
-
2.70-3.20
-
-
-
-
-
-
-
Cu
-
--
--
--
≤0.2
0.4-0.8
≤0.2
--
--
Cr
--
11.5-13.0
19.0-20.5
≤0.2
--
≤0.2
--
--
--
Mo
--
--
1.60-1.85
≤0.2
--
≤0.2
--
--
--
Kovar (also known as KV-1 or ASTM F15) is a nickel-iron alloy that finds wide applications in the field of electronics due to its thermal expansion coefficient that matches that of borosilicate glass. Here are some of the application areas of Kovar:
1. Electronics industry: Kovar strips are commonly used in the electronics industry for the manufacture of vacuum tubes, cathode ray tubes (CRTs), microwave tubes, and other electronic components. The low coefficient of thermal expansion of Kovar ensures that the electronic components maintain their shape and size under varying thermal conditions.
2. Aerospace industry: Kovar strips are used in the aerospace industry for the manufacture of aircraft and spacecraft components, especially those that require high thermal stability and dimensional stability. The low coefficient of thermal expansion of Kovar makes it an ideal material for use in critical aerospace applications.
3. Optical industry: Kovar strips are used in the optical industry for the manufacture of optical filters, mirrors, and lenses as they have excellent thermal stability and low thermal expansion.
4. Automotive industry: Kovar strips are used in the automotive industry for the manufacture of sensors, switches, and other electronic components that require high dimensional stability and thermal stability.
In summary, Kovar strip is a versatile material with a wide range of applications in various industries that require high thermal stability, low thermal expansion, and good mechanical properties.
Changzhou Victory Technology Co., Ltd is a leading manufacturer of high-quality nickel alloy products. We offer a wide range of solutions, including pipes, fittings, bars, sheets, and wires, specializing in grades such as Monel, Inconel, Incoloy, and Hastelloy. With a focus on innovation a...
Changzhou Victory Technology Co., Ltd is a leading manufacturer of high-quality nickel alloy products. We offer a wide range of solutions, including pipes, fittings, bars, sheets, and wires, specializing in grades such as Monel, Inconel, Incoloy, and Hastelloy. With a focus on innovation a...
