Precision Alloy Kovar 4j29 Kovar Alloy Steel Strip Coil Foil Price Concessions

• Customization: Available
• Type: Coil
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Model NO.: kovar 4j29
• Composition: Precision Alloy
• Technique: Cold Rolled
• Shape: Coil
• 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 0.005~0.3mm range
• Trademark: Titanium-nickel alloy
• Origin: Shandong Province, China
• HS Code: 7226920000
• Production Capacity: 20000ton/Month

Product Description

 

Product Description

 

Property	Details
Alloy Name	Kovar (4J29)
Chemical Composition	~29% Nickel, ~17% Cobalt, Balance Iron
Density	8.3 g/cm³
Coefficient of Thermal Expansion (CTE)	~5.5 × 10 /°C (20-200°C)
Melting Point	~1450°C
Curie Point	~435°C
Magnetic Properties	Ferromagnetic below Curie point
Corrosion Resistance	Moderate; often plated for protection
Applications	Hermetic seals, electronic components, CRTs, and glass-to-metal or ceramic-to-metal seals
Key Features	Matches expansion rates of glass and ceramics, excellent sealing properties

 

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.

 

 

Factory workshop

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Packaging & Shipping

FAQ

 

1. What is Kovar (4J29)?

Kovar is a nickel-cobalt-iron alloy specifically designed for applications requiring a precise match of thermal expansion rates with materials like glass and ceramics. It is widely used for hermetic sealing.

 

2. What is the chemical composition of Kovar?

• Nickel: ~29%
• Cobalt: ~17%
• Iron: Balance
• Trace Elements: Carbon, manganese, silicon, and molybdenum.

 

3. What are the key properties of Kovar?

• Low Coefficient of Thermal Expansion (CTE): Matches glass and ceramics over specific temperature ranges.
• High Strength: Retains mechanical integrity at various temperatures.
• Magnetic Properties: Ferromagnetic below its Curie point (~435°C).
• Good Sealing Capability: Excellent for creating airtight seals with glass and ceramics.

 

4. What are the typical applications of Kovar?

• Hermetic Seals: Used in glass-to-metal and ceramic-to-metal seals.
• Electronics: Components for transistors, diodes, and integrated circuits.
• Aerospace: Containers for delicate instruments requiring precise thermal stability.
• Optics: Seals for optical components in high-precision devices.

 

5. Why is Kovar suitable for glass and ceramic seals?

Kovar's thermal expansion closely matches that of specific glasses and ceramics over a wide temperature range, preventing stress and ensuring airtight seals during thermal cycling.

 

6. How does Kovar perform at high and low temperatures?

• Low Temperatures: Maintains excellent dimensional stability and sealing properties.
• High Temperatures: Retains mechanical properties up to its Curie point (~435°C). Beyond this, its magnetic and structural properties may change.

 

7. What are the mechanical properties of Kovar?

• Density: ~8.3 g/cm³
• Tensile Strength: ~500 MPa
• Elastic Modulus: ~138 GPa
• Hardness: ~150 HB

 

8. Is Kovar corrosion-resistant?

Kovar has moderate corrosion resistance. For improved performance in humid or aggressive environments, it is often plated with materials like nickel, gold, or tin.

 

9. Can Kovar be heat-treated?

Yes, Kovar can be annealed or heat-treated to relieve internal stresses or optimize mechanical properties without affecting its thermal expansion characteristics.

 

10. What are the challenges of working with Kovar?

• Machinability: Tough to machine due to its strength and toughness.
• Welding: Requires careful techniques to preserve its properties.
• Cost: Higher cost compared to standard steels due to its composition.

 

11. How does Kovar compare to other alloys like Invar?

While Invar has a lower thermal expansion, Kovar is specifically engineered to match the thermal expansion of glasses and ceramics, making it better suited for sealing applications.

Let me know if you need further clarification or additional details!