Introducing Capillary Tubes

Capillary tubes are special, precision-made, high quality metallurgical products of circular profile. Unlike standard hot and cold made seamless pipes, they are characterized by extremely small walls and diameters with a particularly narrow dimension. The capillary tubes, apart from their small dimensions, are characterized by much smaller deviations of the straightness, precision of the surface itself, the length and the ends of the product. They are most often produced from stainless steel, acid resistant, heat resistant and creep resistant, special alloys, nickel, titanium and other non-ferrous metals. 

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Key Characteristics

(1) High Precision: Capillary tubes are manufactured with strict tolerances to ensure consistent inner and outer diameters.

(2) Smooth Surface: The inner and outer surfaces of the tubes are polished to reduce friction and improve flow efficiency.

(3) Corrosion Resistance: Made from high-grade metal materials, these tubes offer excellent resistance to corrosion, ensuring longevity and reliability.

(4) Strength and Durability: The metal material provides robust mechanical properties, making these tubes suitable for high-pressure and high-temperature environments.

 

Outer Diameter and Wall Thickness Range

The outer diameter range of capillary tubes should be closed in the range of 0.30 - 20.00 mm, while the wall thickness range is between 0.10 - 6.00 mm.

Material Grades

To ensure optimal performance and durability, the material grade of the capillary should be selected according to the specific application requirements. Common grades include:

u304 and 316 Stainless Steel

These are the most widely used grades, known for their excellent corrosion resistance and good mechanical properties.

u321 Stainless Steel

This grade is stabilized with titanium, making it ideal for high-temperature applications.

u904L Stainless Steel

Known for its high resistance to corrosion, especially in harsh chemical environments.

uNickel Alloys

Such as Inconel and Hastelloy, which offer excellent high-temperature and corrosion resistance.

uTitanium Alloys

Lightweight with high strength and corrosion resistance, suitable for specialized applications.

 

Applications Areas

uMedical Industry

Used in the manufacturing of needles, catheters, and precision instruments for minimally invasive surgeries.

uChemical and Pharmaceutical Industry

Employed for precise fluid transfer, sampling, and injection systems.

uLaboratory Research

Utilized in gas chromatography and liquid chromatography for sample separation and analysis.

uIndustrial Manufacturing

Applied in hydraulic systems, fuel lines, and cooling systems for precise fluid control.

uAerospace and Defense

Used in hydraulic systems, fuel lines, and instrumentation tubing where precision and reliability are paramount.

uOil and Gas Industry

Utilized in control and instrumentation tubing in high-pressure and high-temperature environments.

 

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Conclusion

Capillary tubes , with their small size and high precision, are indispensable in many high-tech and demanding applications. Their ability to facilitate precise fluid movement, coupled with their robust material properties, makes them a critical component in industries ranging from medical to industrial manufacturing. Understanding their characteristics, size ranges, material grades, and applications can help in selecting the right tube for specific needs, ensuring efficiency and reliability in various processes.