Description of 4j29 Nickel Alloy Strip
In recent times, the special low-expansion 4J29 alloy, or Kovar alloy, has caught the interest of many. This interest is attributed to its remarkable physical, mechanical, and thermal stability. Nickel and cobalt comprise about 28.5 to 29.5% and 16.8 to 17.8% of 4J29 alloy, respectively, and the rest is iron and minor additives. 4J29 alloy has special thermal expansion properties and is complemented by small amounts of other elements such as carbon, manganese, silicon, phosphorus, sulfur, copper, chromium, and molybdenum, allowing for minimal dimensions to change with temperature variations.
Do you work in aerospace, lasers, or even in elite electronic packing, and are faced with the challenge to find critical material that can seal with hard glass or ceramics for perfect hermeticity? Our Kovar alloy 4J29 ribbon may be perfect for such applications.
Using ultra-high-purity raw materials and advanced refining processes, YIWU YITECH rigorously ensures that the alloy's composition is within the optimal sealing range. Its highly compatible thermal expansion coefficient with borosilicate hard glass effectively eliminates internal stress during the sealing process, preventing cracking and leakage. This product offers excellent room-temperature and high-temperature hermeticity, good ductility, and stable mechanical properties, making it easy to deep-draw into complex parts.
Specifications of 4j29 Nickel Alloy Strip
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Material: |
Nickel alloy |
| Purity: | 30%-72% |
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Density: |
8.3 g/cm³ |
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Melting Point: |
1420–1455℃ |
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MOQ: |
No restrictions |
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Process: |
Cold Drawn, Cold Rolled, Bright Annealed, etc |
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Surface: |
Mirror Polishing, Hairline Finishing, Sb |
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Size: |
Customized |
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Origin: |
China |
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Transport Package: |
Wooden case |
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OEM: |
Avaliable |
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Standard: |
ISO, ASTM, AISI |
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Sample: |
Avaliable |
Testing and quality control of 4j29 Nickel Alloy Strip

FAQ for 4j29 Nickel Alloy Strip
Are you a factory or a manufacturer?
A: Yes, we are a 4j29 Nickel Alloy Strip factory, but we generally use our trading company to handle the business abroad. It will be more convenient to receive the remittance and arrange the shipment.
What is the delivery method?
A: Generally, we send 4j29 Nickel Alloy Strip by UPS, DHL, or FedEx. Also, we can send by sea to a seaport or by air to the closest airport.
Why is your 4j29 Nickel Alloy Strip so cost-effective?
A: We cut out the middlemen in the end-to-end manufacturing process, and we obtain raw material directly from its source.
Do you do spot quality inspection of products?
A: 100% full inspection for sure. All unqualified 4j29 Nickel Alloy Strips are discarded.
How do you ensure your lead time?
A: From material preparation to machining and finally to a full inspection. Every stage of production is strictly monitored and controlled to give you an accurate delivery time.
What is the MOQ of 4j29 Nickel Alloy Strip?
A: Depends on the quantity of 4j29 Nickel Alloy Strip; generally, no MOQ limit.
How to pay for the products?
A: A bank transfer (T/T) will be acceptable.
What is the delivery time?
A: Around 7-20 days, which depends on the quantity and production of 4j29 Nickel Alloy Strip.
What kind of package is it?
A: Generally, we use a carton case or plywood case with protective material inside to ensure the safety of 4j29 Nickel Alloy Strip.
What is the lead time?
A: From the order placed to cargo receiving will take around 10-25 days.

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