Kovar(4J29) Alloy Material
Kovar/4J29/UNS K94610/W.Nr.1.3912
Kovar glass sealed and controlled expansion alloys Equal grades: ASTM F15, Nilo-K,UNS K94610 (FeNi29Co17), 4J29, 29HК Applications: 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. Integrated circuits, it has been used for the flat pack and the dual-in-line package Our factory has over 15 years' experience of Kovar capillary production Size range we could supply is: O.D: 0.20~8mm Wall thickness: 0.05~1mm The tolerance we could meet: Out diameter: ±0.003mm Wall thickness: ±0.005mm Length: ±0.05mm We could do further fabrication of the capillary such as cutting, bending, slotting and so on
Kovar (4J29) Chemical components
	C	Si	Mn	P	S	Ni	Fe	Cu	Cr	Co	Mo
max	0.03	0.3	0.5	0.02	0.02	29.5	bal	0.2	0.2	17.8	0.2
min						28.5				16.8
Kovar (4J29)Mechanical property & Physical properties:
Yield Strength		Tensile Strength		Elongation		Hardness		Density		Melting point
(Mpa)		(Mpa)		(%)		(HRC)		Density		Melting point
344		517		30		78HB		8.36 g/cm3		1450 °C
Supply scope
O.D: 0.20~100mm Wall thickness: 0.05~10mm The tolerance we could meet: Out diameter: ±0.003mm Wall thickness: ±0.005mm
Coefficient of Thermal Expansion (Nominal):
°C		20-200	20-300	20-400	20-450	20-500	20-600	20-700	20-800
10-6 /°C		5.9	5.3	5.1	5.3	6.2	7.8	9.2	10.2

Kovar (4J29)Applied field:
1.Kovar alloy has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials.
2.This alloy has found wide application in power tubes, microwave tubes, transistors and diodes. In integrated
circuits, it has been used for the flat pack and the dual-in-line package

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