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brief introduction
4J33 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.
Main specifications:
Chinese grade Russia Germany 4J34 31HК(Ni31Co20) Vacon20(Ni28Co20) 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.
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 typical average linear expansion coefficient value α,10-6/℃
Grade 20℃~100℃ 20℃~200℃ 20℃~300℃ 20℃~400℃ 20℃~450℃ 20℃~500℃ 20℃~600℃ 20℃~700℃ 20℃~800℃ 4J34 - 7.5 6.9 6.6 - 6.9 8.3 - - Main product types:
wire,rod, bar,strip, plate/sheet,tube, ring,forging
