1. Brief introduction:

   Ceramic sealing alloy.

   It has a linear expansion coefficient similar to that of 95% Al2O3 ceramic in -60℃ to 600℃ temperature range.

   It is mainly used for matching sealing with ceramics and is an important sealing structure material in the electric vacuum industry.

    

2. Main specifications:
   

   Chinese grade	Russia	Japan
   4J33	33HК(Ni33Co17)	KV-4(Ni33Co17)

    

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

   Grade	chemical composition,%
   	C	P	S	Mn	Si	Cu	Cr	Mo	Ni	Co	Fe
   	MAX
   4J33	0.05	0.02	0.02	0.5	0.3	–	–	–	32.1~33.6	14~15.2	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	＞700	＞860

    

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

   Grade	20℃~100℃	20℃~200℃	20℃~300℃	20℃~400℃
   4J33	–	7.1	6.5	6.3
   20℃~450℃	20℃~500℃	20℃~600℃	20℃~700℃	20℃~800℃
   –	7.1	8.5	–	–

   
   

6. Main product types:

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

   
   

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