Kovar 4J29 Nickel Alloy

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The Kovar nickel alloy supplied by XINHUA has similar linear expansion coefficient with borosilicate (or Pyrex) over a range of temperatures (20℃~450℃), enabling it to be compatible with the thermal expansion characteristics of hard glass so as to achieve hermetic seals.

Oxidation film densification allows this iron-nickel-cobalt alloy to be readily welded and excellent plasticity makes it fabricable. Wide applications are power tubes, vacuum tubes, transmitting tubes, kinescopes, switch tubes, transistors, relay housing, etc.

Specifications

GB/T	ASTM	UNS	W. Nr
4J29	F15	K94610	1.3981

Chemical Compositions of Kovar Nickel Alloy

Composition		Ni	Cr	Fe	Co	Cu	C	Mn	Si	P	S	Mo
Content (%)	Min.	28.5		Bal.	16.8
Content (%)	Max.	29.5	0.2	Bal.	17.8	0.20	0.03	0.50	0.30	0.02	0.02	0.20

Coefficient of Linear Expansion

a/10-6·K-1	200-300℃	20-400℃	20-450℃
a/10-6·K-1	/	4.6-5.2	5.1-5.5