Precision 4j29 Low-Cte Seamless Tubes for Semiconductor Furnaces

• Customization: Available
• Type: Seamless
• Technique: Hot Rolled
• Model NO.: 4J29
• 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
• Trademark: Zhongxing
• Origin: China
• HS Code: 75071200
• Production Capacity: 500000000

Product Description

Company Profile

 

Product Description

4J29 seamless 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	-	-	-	-	-	-	-	-	-	-	-	-	-	-

 

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