Kovar/4J29
Category：Expansion alloy» | Date：2023-03-17
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.
Main specifications:
Chinese grade UNS ASTM DIN Werkstoff Nr. Germany Russia UK 4J29 K94610(FeNi29Co17) F15 17745 1.3981 Silvar 48 29HK Nilo K chemical composition under YB/T5231-2005 standard:
Grade chemical composition,% C P S Mn Si Cu Cr Mo Ni Co Fe MAX 4J29 0.03 0.02 0.02 0.5 0.3 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.
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 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℃ 4J29 – 5.9 5.3 5.1 5.3 6.2 7.8 9.2 10.2 Main product types:
wire,rod, bar,strip, plate/sheet,tube,capillary tube, ring,forging
