Specifications

1.A nickel-iron-cobalt controlled-expansion alloy
2.Have ISO9001:2008 Certificate
3.Have RoHs test report

4J29 KOVAR

4J29 is also known as kovar alloy,ASTM F15,Nilo-K, UNS K94610 ,(FeNi29Co17),

YB/T5231-2005 ,(FeNi29Co18),Lockinvar,Alloy 12B,Sealing Alloy. Iron Nickel cobalt.

 

Note:

A Nickel-Iron-Cobalt, controlled expansion alloy containing 29% Nickel. It's coefficient of expansion (which decreases with rising temperature to the inflection point), matches the expansion rate of borosilicate glasses and aluminia ceramics. Applications include glass to metal seals in applications requiring high reliability or resistance to thermal shock, ie. high-power transmitting valves,transistor leads and heaters and photography flash bulbs.

 

1.Alloy grades and chemical composition consistent with the provisions of table 1

the chemical composition of Kovar(%)
C	P	S	Mn	Si	Cu	Cr	Mo	Ni	Co	Fe
Not more than≤
0.03	0.020	0.020	0.5	0.30	0.20	0.20	0.20	28.5-29.5	16.8-17.8	balance