Presision Alloy Kovar 4j29 Kovar Alloy Steel Sheet/Plate Factory Direct Supply

• Customization: Available
• Type: Sheet
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Model NO.: kovar 4j29
• Composition: Precision Alloy
• Technique: Cold Rolled
• Shape: Sheet
• Surface Treatment: Polished
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
• Application: Aerospace, Chemical Industry,
• MOQ: 50kg
• Trade Terms: EXW, Fob, CIF, CFR
• Stock: Stock Available
• Delivery Time: 10-20day
• Transport Package: Marine Packaging of Metal
• Specification: Ultra-thin 0.5~100mm range
• Trademark: Titanium-nickel alloy
• Origin: Shandong Province, China
• HS Code: 7226920000
• Production Capacity: 20000ton/Month

Product Description

 

Product Description

Here is an English table summarizing the key properties of Kovar (4J29):

Property	Value
Composition	29% Cobalt, 17% Nickel, Balance Iron
Density	8.2 g/cm³
Thermal Expansion Coefficient	~5.0 × 10 /°C (room temperature to 500°C)
Melting Point	~1,300°C (2,372°F)
Tensile Strength	550-700 MPa
Electrical Resistivity	1.4 µΩ·cm
Poisson's Ratio	~0.30
Modulus of Elasticity	210 GPa
Hardness (Rockwell B)	~95
Thermal Conductivity	~16 W/m·K
Magnetic Properties	Ferromagnetic
Applications	Electronic seals, glass-to-metal seals, vacuum systems, semiconductor manufacturing

 

Detailed Photos

 

 

Company Profile

 Shandong Titanium Nickel Special Steel Co., Ltd., registered funds (one thousand yuan for 10,000 yuan), the company is mainly committed to high -tech enterprises that are integrated with special alloy materials, specializing in the research and sales of special alloys such as nickel -based and iron -based. Products include corrosion-resistant alloys, superalloys, precision alloys, Hastelloy, Monel, INCONEL, INCOLOY, copper-nickel alloys, titanium and titanium alloys, zirconium and zirconium alloys, nickel and nickel-based alloys, nickel-cobalt-based heat-resistant alloys , Hafnium alloy, etc., more than 60 kinds of alloy materials such as special stainless steel. On the basis of stabilizing the quality of the original products, according to the market demand, it solves the quality problems existing in the traditional metallurgical process, and ensures the low miscellaneous and low deflection of the alloy material products, which has won an excellent reputation in the industry.

 

 

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FAQ

1. What is Kovar alloy?

Kovar (4J29) is a cobalt-nickel iron alloy, typically composed of 29% cobalt, 17% nickel, and the balance being iron. It is known for its low and uniform thermal expansion coefficient, which is close to that of borosilicate glass, making it ideal for glass-to-metal seals.

2. Why is Kovar important?

Kovar's ability to expand at the same rate as borosilicate glass makes it invaluable in applications where metal needs to be sealed to glass without causing cracking due to differential expansion. This makes it ideal for electronics, aerospace, and vacuum systems.

3. What are the key properties of Kovar?

• Low Coefficient of Thermal Expansion: ~5.0 × 10 /°C (similar to borosilicate glass).
• High Mechanical Strength: Tensile strength of 550-700 MPa.
• Corrosion Resistance: Moderate resistance to corrosion but may require protection in harsh environments.
• Magnetic Properties: Ferromagnetic, though less magnetic than pure iron.
• Good Weldability and Formability: Can be easily welded and processed.

4. What are the main applications of Kovar?

• Glass-to-Metal Seals: It is primarily used for sealing glass to metal, such as in electronic components and vacuum tubes.
• Electronic Devices: In semiconductors, circuit components, and other precision electronics.
• Aerospace and Vacuum Systems: Used in environments that require vacuum integrity and dimensional stability under temperature fluctuations.
• Military and Medical Applications: In certain high-reliability applications, such as hermetic seals for medical devices and sensors.

5. What is the thermal expansion of Kovar?

Kovar has a very low coefficient of thermal expansion (~5.0 × 10 /°C), which is very close to that of borosilicate glass. This allows it to be used in applications where metal needs to be joined to glass without causing thermal stress and cracking.

6. Can Kovar be welded?

Yes, Kovar can be welded using various methods, such as tungsten inert gas (TIG) welding, but special care is needed to ensure minimal distortion. The welding process must be carefully controlled due to the alloy's high cobalt content, which can make it somewhat brittle.

7. What are the advantages of Kovar alloy?

• Thermal Expansion Matching: It matches the expansion of certain glasses and ceramics, making it ideal for sealing applications.
• Mechanical Strength: It offers high strength and durability, even in challenging environments.
• Magnetic Properties: Its ferromagnetic nature can be advantageous in applications where magnetic properties are required.

8. What are the challenges of working with Kovar?

• Cost: Kovar is more expensive than many other alloys due to its cobalt content.
• Brittleness: The alloy can be more brittle than some other materials, especially when exposed to higher temperatures or in thinner forms.
• Specialized Handling: Because of its cobalt content, Kovar requires specialized techniques for welding and machining to avoid cracking or distortion.

9. Is Kovar alloy resistant to corrosion?

Kovar has moderate resistance to corrosion, but it may require protective coatings or additional treatments in highly corrosive environments, such as in seawater or aggressive chemicals.

10. Is Kovar used in the semiconductor industry?

Yes, Kovar is commonly used in semiconductor devices and other precision electronic applications. Its ability to form tight, reliable glass-to-metal seals is critical in these fields, particularly for packages that house semiconductors and sensors.

11. Can Kovar be used in high-temperature applications?

While Kovar is generally stable at moderate temperatures, it is not suited for extremely high-temperature applications (above 500°C) because its properties, including strength and dimensional stability, can degrade at elevated temperatures.

If you have more specific questions or need further details on Kovar (4J29), feel free to ask!