Precision 4j29 Low-Expansion Capillary Tubing for Vacuum Feedthrough Applications

• Customization: Available
• After-sales Service: Online
• Warranty: 6 Months
• Model NO.: 4J29
• Type: Seamless
• Technique: Hot Rolled
• Material: Alloy Steel
• Surface Treatment: Polished
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Transport Package: Shipping Package
• Specification: customized
• Trademark: Zhongxing
• Origin: China
• HS Code: 75071200
• Production Capacity: 500000000

Product Description

4J29 capillary tubes represent a pinnacle of precision manufacturing, tailored to meet the stringent demands of industries requiring ultra-fine, high-performance components. Fabricated from the iron-nickel-cobalt alloy 4J29 (also known as Kovar), these tubes exhibit exceptional thermal expansion compatibility with glass, ceramics, and specific grades of stainless steel, making them indispensable in applications where hermetic sealing and dimensional stability are critical. The alloy's unique composition-29% nickel, 17% cobalt, and trace elements-ensures a controlled coefficient of thermal expansion (CTE) that closely matches that of borosilicate glass and alumina ceramics. This property eliminates mechanical stress at junctions between dissimilar materials during temperature fluctuations, a feature vital for vacuum seals, optical systems, and electronic packaging. Capillary tubes manufactured from 4J29 undergo rigorous cold-drawing processes to achieve inner diameters as small as 0.1 mm with tolerances within ±0.005 mm, while maintaining exceptional surface finish (Ra ≤ 0.4 μm) to prevent fluid turbulence or particulate entrapment in analytical instrumentation. Advanced annealing techniques are employed to optimize ductility without compromising the alloy's signature thermal properties, enabling complex forming operations for medical device components and aerospace sensors.

 

Contact us today to discuss your project needs and discover how 4J29 can elevate your engineering solutions.
 

Grades		Chemical Composition(wt)%
		C	Cr	Ni	Ti	Fe	Co	Mn	Si	Mo	Cu	W	P	S	Al	Nb	V	B	Zr	O+N	H
4J29	Max	0.03	-	29.5	-	rest	17.8	0.5	0.3	-	0.2	-	0.02	0.02	-	-	-	-	-	-	-
	Min	-	-	28.5	-	-	16.8	-	-	-	-	-	-	-	-	-	-	-	-	-	-

 

 

Jiangsu Zhongxing Nickel Alloy Co., Ltd. is a leading manufacturer specializing in the research, development, and production of seamless pipes and capillary coils. With a factory spanning 16,000 square meters, we offer a diverse range of products, including nickel alloys, high-temperature alloys, nickel-copper alloys, nickel-titanium alloys, Invar alloys, soft magnetic alloys, and other alloy materials.

Our technical team has achieved world-leading levels through years of technological improvement and innovation, developing domestically produced technologies that are high-performance, high-quality, and high-yield.

Our company is certified under ISO 9001, EU PED, and China TS for pressure pipeline systems, ensuring our commitment meeting and going beyond what international industry standards' required. Each product undergoes rigorous quality control and performance testing, and has accumulated rich OEM/ODM production experience for international market supply.



Q1:Are you a factory or trade company?
A1: A Factory and A subsidiary international trade company for export.

Q2:Where is your factory?
A2:Our company is located in Huaian city, China, which is well equipped with kinds of machines.

Q3: How do you control quality?
A3: Inspection & Guarantee Certificate is supplied with shipment, and the Third Party Inspection is available.

Q4: What are the advantages of your company?
A4: We have many professional and technical personnel, more competitive prices and better after-sales service than other companies.

Q5: Can you arrange the shipment?
A5: Sure, we can help you with the shipment. We have forwarders who have cooperated with us for many years.

Q6: How about the delivery time?
A6: It is based on the order, normally within 30 days after receiving your advance payment.

Q7: Can you provide sample?
A7: Small samples in store can be provided for free.

Please contact us for more information today!