1. Brief introduction:

   It’s nickel-iron controlled-expansion alloy  with Ni50% nominal value.

   It’s widely used as sealing structural material in the electric vacuum industry.

    

2. Main specifications:
   

   Chinese	UK	USA	France	Germany	Russia	Japan
   4J50	Nilo51	FeNi50	N50	Vacodil 500	50H	NS-1

    

3. Chemical composition under YB/T5235-2005 standard:
   

   Grade	chemical composition,%
   	C	P	S	Mn	Al	Si	Co	Ni	Fe
   	MAX
   4J50	0.05	0.02	0.02	0.8	0.1	0.3	–	49.5~50.5	Remainder

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

    

4. Tensile strength under YB/T5235-2005 standard:
   

   delivery condition	Tensile strength of strip ,N/mm2
   Soft	＜590
   Hard	＞700

    

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

   Grade	20℃~100℃	20℃~200℃	20℃~300℃	20℃~400℃	20℃~450℃	20℃~500℃	20℃~600℃
   4J50	9.8	9.8	9.5	9.4	–	9.7	10.6

    

6. Main product types:

   wire,rod, bar,strip, plate/sheet,tube.

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