4j29 Ribbon Kovar Expansion Precision Alloy Flat Wire

Model NO.: 4J29 Material: Fe,Ni, Co Status: Bright Thermal Expansion Coefficient: 5.0(20~300°c)10-6/°c Thermal Conductivity(W/M. °c): 20.3 Advantages: Small Order Accepted ,Short Delivery Time Certification: ISO9001 Trademark: Ualloy Origin: Zhejiang, China Product Type: Flat Wire, Ribbon Carbon Content: Low Carbon Density(g/cm3): 8.17 Curie Point(°c): 430 Size: Thickness:Less Than 0.5mm Width: Less Application: Ignitron, Magnetron, Transistor, Sealing Plug, Rel Chemical Composition: Ni,Co,Fe Specification: SGS HS Code: 75052200
1.Description:  

4J29(China); 29H, 29H-B, Techallony(Russia); Kovar, Rodar, Glasseal 29-17(United States); Nilo K, Telcaseal(Great Britain); KV-1, KV-2, KV-3(Japan); Dilver P0, Dilver P1(France); Vacon 12, Silvar 48(Germany).

4J29 expansion alloy, also known as Kovar alloy, is a Nickel Iron alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron. The expansion characteristics of Kovar match both borosilicate (or Pyrex) glasses and alumina ceramics, making it one of the most popular controlled expansion alloys for hermetic sealing applications. Kovar is produced to ensure good properties for machining and deep drawing, and is a porosity free product. You'll find Kovar in applications such as power tubes, microwave tubes, transistors, diodes, hybrid packages, and other kinds of scientific instruments.
 
 
 
2. Chemical composition(%)
 
 
 

Grade	C	Si	Mn	P	S	Ni	Co	Fe
4J29	0.015	0.12	0.25	0.006	0.005	29.10	17.3	Bal

 
 
 
 
3. Physical properties
 
 
 

Grade	Density(g/cm3)	Thermal expansion coefficient (10-6/°C)	Curie point(°C)	Volume resistivity(μΩ.cm)	Thermal conductivity(W/m. °C)
4J29	8.17	5.0(20~300°C) 5.2(20~450°C	430	46(20°C)	20.3

 
 
 
 
4. Mechnical properties
 
 
 

Grade		Yield Strength(Mpa)	Tensile Strength	Elongation(%)	Hardness(HV)
4J29	Temper rolled	695	780	5	230
	As annealed	315	520	24	148

 
 
 
 
 
5.Application
The alloy is widely used as glass sealing for electronic vacuum devices, such as launching tube, oscillating tube, ignitron, magnetron, transistor, sealing plug, relay, leading wire of integrated circuit, chassis, shell, scaffold and so on.
 
 
6.size

Flat Wire  : thickness:less than 0.5mm
             width: less than 5mm


 
7.Advantages
1.Pass: ISO9001 certification 
2.fine after-sale services 
3.small order accepted 
4.samples available 
5.short delivery time 

Contact us if you need more details on Ni29co17. We are ready to answer your questions on packaging, logistics, certification or any other aspects about Uns K94610、4j29. If these products fail to match your need, please contact us and we would like to provide relevant information.

Product Categories : Precision Alloy