GB/T	AISI/ASTM	JIS	W.Nr
4J29	F15	EMAS-1001	1.3912

chemical composition:

Brand	%	Ni	Cr	Fe	Co	Cu	C	Mn	Si	P	S	Mo
4J29	min	28.5		margin	16.8
4J29	min	29.5	0.2	margin	17.8	0.20	0.03	0.50	0.30	0.02	0.02	0.20

Average linear expansion coefficient (10-6 ° C:

20~100℃	20~300℃	20~400℃	20~450℃	20~500℃	20~530℃	20~600℃
——	——	4.6~5.2	5.1~5.5	——	——	——

4J29 alloy has a coefficient of expansion similar to that of hard glass in a wide temperature range (-80~450°C). In the electric vacuum industry, it is used to seal high-viscosity components with hard glass. Ceramic sealing. Name: Iron nickel cobalt glass sealing alloy. It has a thermal expansion coefficient similar to that of silicon-boron hard glass at 20 to 450 °C, and has a high Curie point and good low temperature structure stability. It is an iron nickel cobalt glass sealing alloy.