Shanghai, China
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Kovar Seamless Tube, 4j29 Seamless Tube, Kovar Tube manufacturer / supplier in China, offering Seamless Tube of Kovar, Constantan Flat wire, SS420 stainless steel wire TAFA t60 Thermal Spray Wire and so on.

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Seamless Tube of Kovar

Get Latest Price
Min. Order / Reference FOB Price
30 KG US $300/ KG
Production Capacity: 1 Tons Per Month
Transport Package: Waterproof Paper, Wooden Case
Payment Terms: L/C, T/T, Paypal, Western Union
Product Type: Tube
Material: Feni
Carbon Content: Low Carbon
Shape: Tube
Condition: Soft
Surface: Bright

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Basic Info

Model NO.: Kovar tube/ 4J29 tube
Diameter Outside: 2-30mm
Diameter Inside: 0.5-10mm
MOQ: 5 Kgs
Sample: Free
Trademark: TANKII-429
Specification: RoHs
Origin: China
HS Code: 750712000

Product Description

Grade : Kovar nickel-cobalt ferrous alloy/ 29HK/ 4J29
 
Classification : the alloy of expansion characteristics

Application: Kovar (trademark of CRS Holdings, inc., Delaware[1]) is a nickel-cobalt ferrous alloy compositionally identical to Fernico 1, designed to be compatible with the thermal expansion characteristics of borosilicate glass (~5 × 10?6 /K between 30 and 200 °C, to ~10 × 10?6 /K at 800 °C) in order to allow direct mechanical connections over a range of temperatures. It finds application in electroplated conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes and some lightbulbs.
 
 
Chemical Composition in %  Kovar


 Ni
28,5-29,5%

Fe
51,14-54,5%

C
0.03%

Si
0.3%

Mn
0,4 %

S
o 0.015%

P
0.015%

o
17-18%

Ti
0.1%

Al
0.2%

Cu
0.2%

Cr
0,1 %
 
 
The thermal properties of alloy
 
Temperature coefficient of linear expansion αsr ? 10-6 K-1 in the temperature range, ° Cinflection point temperature, ° C
No less
Heat treatment regime blanks and samples
20-8020-10020-30020-40020-45020-50020-800
--4,6-5,64,6-5,2-5,9-6,4-420samples and blanks annealing in hydrogen, a vacuum or protective atmosphere at a temperature (960 ± 20) ° C, holding 1 hr., cooling with the furnace or container to 200 ° C at a rate not exceeding 10 ° C / min

PropertysinteredHIPed
Density / g cm38.08.35
Hardness / HV1160150
Youngs Modulus / GPa138138
reduction of area at fracture / %3030
yield strength / MPa270270
thermal conductivity / W/Km17
Curie Temperature / °C435
electrical resistivity Ω mm2 / m0.49
specific heat J/gK0.46
thermal expansion coefficient/10?6 K?1 (25 - 200 °C)5.5
(25-300 °C)5.1
(25-400 °C)4.9
(25-450 °C)5.3
(25-500 °C)6.2














 
The name Kovar is often used as a general term for Fe-Ni alloys with these particular thermal expansion properties. Note the related particular Fe-Ni alloy Invar which exhibits minimum thermal expansion.
 
TANKII, referring to the presence of high-power production, offers customers buy alloy Kovar in the required quantities and ensures minimum time shipments of rolled metal products, made on the basis of Kovar.

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