1. brief introduction4J33 is also an 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	Germany
   4J34	31HК(Ni31Co20)	Vacon20(Ni28Co20)

    

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

   Grade	chemical composition,%
   	C	P	S	Mn	Si	Cu	Cr	Mo	Ni	Co	Fe
   	MAX
   4J34	0.05	0.02	0.02	0.5	0.3	–	–	–	28.5~29.5	19.5~20.5	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℃
   4J34	–	7.5	6.9	6.6
   20℃~450℃	20℃~500℃	20℃~600℃	20℃~700℃	20℃~800℃
   –	6.9	8.3	–	–

   
   

6. Main product types:

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

   
   

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