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kovar nico2918 precision alloy 4j29 kovar tube pipe
kovar nico2918 precision alloy 4j29 kovar tube pipe
kovar nico2918 precision alloy 4j29 kovar tube pipe
kovar nico2918 precision alloy 4j29 kovar tube pipe
kovar nico2918 precision alloy 4j29 kovar tube pipe
kovar nico2918 precision alloy 4j29 kovar tube pipe
kovar nico2918 precision alloy 4j29 kovar tube pipe
kovar nico2918 precision alloy 4j29 kovar tube pipe

kovar nico2918 precision alloy 4j29 kovar tube pipe

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≥10 Kilograms
US $26
≥500 Kilograms
US $24
≥1000 Kilograms
US $20
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Quick Details

Elongation (≥ %):
30
Place of Origin:
Hebei, China
Application:
Glass sealing alloy
Grade:
fe-ni-co
Ni (Min):
28.5
Model Number:
Kovar
Brand Name:
ChengYuan
Product name:
kovar tube
Curie point(Tc/ ℃):
430
Usage:
Electric vacuum devices
Density:
8.2g/cm3
Elastic Modulus(E/ Gpa):
138
Technique:
cold rolled
Feature:
Typical Fe-Ni-Co hard glass sealing alloys
Other name:
29HK,Kovar, Nilo K, KV-1, Dilver Po, Vacon 12
MOQ:
10kg
Keywords:
4j29 tube

Quick Details

Resistance (μΩ.m):
0.48
Powder Or Not:
Not Powder
Ultimate Strength (≥ MPa):
520
Elongation (≥ %):
30
Place of Origin:
Hebei, China
Application:
Glass sealing alloy
Grade:
fe-ni-co
Ni (Min):
28.5
Model Number:
Kovar
Brand Name:
ChengYuan
Product name:
kovar tube
Curie point(Tc/ ℃):
430
Usage:
Electric vacuum devices
Density:
8.2g/cm3
Elastic Modulus(E/ Gpa):
138
Technique:
cold rolled
Feature:
Typical Fe-Ni-Co hard glass sealing alloys
Other name:
29HK,Kovar, Nilo K, KV-1, Dilver Po, Vacon 12
MOQ:
10kg
Keywords:
4j29 tube
Product Paramenters
Spesification
Alloy Type
Trade Name
UNS No.
RUS Grade
FR Grade
Sdandard
Forms Of Supply
Rod
Strip
Wire
Sheet
Ni29Co17
Kovar
Kovar
29HK
Nilo K
ASTM F15
FeNi36
Invar 36
Invar
36H
Invar standard
ASTM 1684
FeNi42
Alloy 42
Glass sealing42
42H
N42
ASTM F30
FeNi48
Alloy 48
K94800
47ND
ASTM F30
Ni33Co17
Kovar Physical properties
Density (g/cm3)
Resistivity at 20℃(Ωmm2/m)
Temperature Coefficient of Resistance
(20℃~100℃)X10 -5 /℃
Curie point
(Tc/ ℃)
Elastic Modulus
(E/ Gpa)
8.2
0.48
3.7~3.9
430
138
Kovar Tensile strength, MPa
Status number
State
Wire
Strip
R
Soft
≤585
≤570
1/4I
1/4 Hard
585~725
520~630
1/2I
1/2 Hard
655~795
590~700
3/4I
3/4 Hard
725~860
600~770
I
Hard
≥850
≥700
Kovar Coefficient of expansion
θ/℃
α1/10 -6 -1
θ/℃
α1/10 -6 -1
20~60
7.8
20~500
6.2
20~100
6.4
20~550
7.1
20~200
5.9
20~600
7.8
20~300
5.3
20~700
9.2
20~400
5.1
20~800
10.2
20~450
5.3
20~900
11.4
Kovar Thermal conductivity
θ/℃
100
200
300
400
500
λ/ W/(m*℃)
20.6
21.5
22.7
23.7
25.4
Supply category
Type
Size
Wire
D= 0.1~8mm
Strip
W= 5~250mm
T= 0.1mm~2.5mm
Foil
W= 10~100mm
T= 0.01~0.1mm
Bar
Dia= 8~100mm
L= 50~1000mm
Product Description
Kovar alloy; it has a linear expansion coefficient similar to that of silicon boron hard glass at 20 to 450°C, so it is often called a glass seal alloy in production and processing. This alloy is a typical Fe-Ni-Co hard glass sealing alloy used internationally, with a high Curie point and good low-temperature microstructure stability. The alloy's oxide film is dense, can be well infiltrated by glass, and does not interact with mercury. It is suitable for use in mercury-containing discharge meters. It is the main sealing structure material for electric vacuum devices. It is mainly used for electric vacuum components and emission tubes. Glass sealing of oscillating tube, ignition tube, magnetron, transistor, sealing plug, relay, integrated circuit lead wire, chassis, housing bracket, etc.

In the application, it should be ensured that the selected glass matches the expansion coefficient of the alloy, and its low-temperature structural stability can be strictly checked according to the temperature of use. Appropriate heat treatment should be carried out during processing to ensure that the material has good deep drawing elongation. The alloy is heated to 900°C±20°C in a hydrogen atmosphere for 1 hour, then heated to 1100°C±20°C, held for 15 minutes, and cooled to below 200°C at a rate of no more than 5°C/min.When forging materials are used, their air tightness should be strictly inspected.

Heat treatment process
Stress relief annealing
Heat to 470~540℃, keep for 1~2 h. Cool in the furnace
annealing
Heating to 750~900℃ in vacuum
Holding time
14 min~1h.
Cooling method
Cool down to 200 ℃ at a rate not exceeding 10 ℃/min
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