Astm F15 Seamless, Kovar Tube Matching Sealing For Electric Vacuum Industry

Product Details:
Place of Origin: CHINA
Brand Name: JINXING
Certification: ISO 9001
Model Number: Kovar Tube
Payment & Shipping Terms:
Minimum Order Quantity: 50KGS
Price: 15~50USD/kg
Packaging Details: Plywood Case
Delivery Time: 25 work days
Payment Terms: L/C, D/A, D/P, T/T, Western Union
Supply Ability: 100000kgs/M

Detail Information

Material: Kovar Alloy K UNS K94610 Surface: Pickled , Polished
Standard: ASTM F15 Heat Treatment: Solution Annealed
Size: Customized Application: Glass Sealing
Density: 8.36g/cm3 Melting Point: 1450C
High Light:

ni based superalloys


ni based alloys

Product Description

Kovar Tube

Kovar alloy tube , Alloy K / UNS K94610 / ASTM F15


  • Description

Alloy K / K94610 / ASTM F15 Also known as Kovar*** and Nilo K**, this alloy contains 29% nickel with a 17% cobalt addition. Its composition is tightly controlled within narrow limits to ensure precise and universal thermal expansion and mechanical characteristics. This helps the material provide high integrity glass-to-metal and ceramic-to-metal seals in applications requiring reliability and resistance to thermal shock. Alloy K is often used for the manufacture of hermetic seals with both the harder Pyrex or borosilicate glasses and alumina-type ceramic materials. It finds extensive application in the production of transistors and diodes for lids and closures in a variety of hybrid electronic circuit packages and also in the manufacture of microwave tubes.


Main Application:

Matching sealing in electric vacuum industry and hard glass


Material :

Russia USA England Japan Franch Germany
29HK kovar Nilo K KV-1 Dilvar P0 Vacon 12
29HK-B Rodar
Techallony Glasseal 29-17
Teleaseal KV-2
Dilver P1 Silvar


Content Composition %

C P S Mn Si Cu Cr Mo Ni Co Fe
Less than
0.03 0.02 0.02 0.5 0.3 0.2 0.2 0.2 28.5-29.5 16.8-17.8 Rest

Physical properties

Density g/cm3 8.25
Curie Point 430
Resistivity μ· m 0.48
Tensile strength Mpa Cold state  
Annealing 520
Yield strength Mpa Cold state  
Annealing 330
Elongation % Cold state  
annealing 30


The linear expansion coefficient of the kovar alloy is similar to that of borosilicate glass at 20-450 ℃, the Curie point is higher, and the alloy has good low temperature structure stability. The oxide film of the alloy is compact and can be well infiltrated by glass. It does not interact with mercury and is suitable for use in instruments containing mercury discharge. It is the main sealing structure material of electric vacuum device.


 Astm F15 Seamless, Kovar Tube Matching Sealing For Electric Vacuum Industry 0

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