1. Brief introduction:

   It’s Ni-Fe-Co controlled-expansion alloy with Ni29% nominal value.

   Its coefficient of expansion matches the expansion rate of borosilicate glasses and alumina ceramics.

   It’s used for glass-to-metal seals applications, for example:high-power transmitting valves, transistor leads and headers, integrated-circult lead frames and photography flash bulbs. 

   
   

2. Main specifications:
   

   Chinese grade	UNS	ASTM	DIN	Werkstoff Nr.	Germany	Russia	UK
   4J29	K94610 FeNi29Co17	F15	17745	1.3981	Silvar 48	29HK	Nilo K

    

3. chemical composition under YB/T5231-2005 standard:

   Grade	chemical composition,%
   4J29	C	P	S	Mn	Si
   	≤0.03	≤0.02	≤0.02	≤0.5	≤0.3
   Cu	Cr	Mo	Ni	Co	Fe
   ≤0.2	≤0.2	≤0.2	28.5~29.5	16.8~17.8	Remainder

   Remarks：If require adjustments for some chemical compositions, pls consult with us.

   
   

4. Tensile strength under YB/T5231-2005 standard:
   

   delivery condition	Tensile strength of strip ,N/mm2	Tensile strength of wire,N/mm2
   soft	＜570	＜585
   Hard 1/4	520-630	585-725
   Hard 1/2	590-700	655-795
   Hard 3/4	600-770	725-860
   Hard	＞700	＞860

    

5. typical average linear expansion coefficient value α,10-6/℃:

   Grade	20℃~100℃	20℃~200℃	20℃~300℃	20℃~400℃
   4J29	–	5.9	5.3	5.1
   20℃~450℃	20℃~500℃	20℃~600℃	20℃~700℃	20℃~800℃
   5.3	6.2	7.8	9.2	10.2

   
   

6. Main product types:

   wire,rod, bar,strip, plate/sheet,tube,capillary tube, ring,forging

For more product information, please click the top product menu navigation, or view the relevant product information in the right column.