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Cryogenic capillary tube is a precision-drawn small-diameter tubing designed for ultra-low temperature applications that require accurate fluid control, pressure regulation, thermal transfer, and flow restriction. Manufactured by Huashang Steel, the tubing is made from cryogenic-grade alloys including TP316L stainless steel, Inconel 625, Incoloy 825, and Monel 400. It retains mechanical strength and dimensional stability at temperatures as low as -269°C (-452°F).
This tubing serves a wide range of industrial applications, including cryocooler production, hydrogen energy systems, semiconductor manufacturing, aerospace engineering, and scientific research facilities. Produced via seamless cold drawn precision processes, the tubing features tight dimensional control and multiple surface finish options to meet the specific requirements of cryogenic and hydrogen industry operations.
Parameter | Range |
Material Grade | TP316L, Inconel 625, Incoloy 825, Monel 400 |
Standard | ASTM A269, ASTM A632, ASTM B444, ASTM B423 |
Manufacturing Process | Seamless / Cold Drawn Precision Tube |
Outside Diameter (OD) | 0.30 mm – 8.00 mm |
Wall Thickness (WT) | 0.05 mm – 1.00 mm |
Length | Straight Length or Coil |
Surface Finish | BA, EP, Pickled |
Tolerance | ±0.01 mm to ±0.03 mm |
Operating Temperature | -269°C to +600°C |
Certification | EN10204 3.1, PED 2014/68/EU |
Two sets of pre-set standard sizes are available for common application scenarios. Custom dimensions can be manufactured according to customer drawings and specific flow-control requirements.
Ultra Precision Sizes
OD (mm) | WT (mm) | ID (mm) |
0.80 | 0.15 | 0.50 |
1.00 | 0.20 | 0.60 |
1.20 | 0.20 | 0.80 |
1.60 | 0.25 | 1.10 |
2.00 | 0.30 | 1.40 |
2.50 | 0.30 | 1.90 |
3.00 | 0.50 | 2.00 |
4.00 | 0.50 | 3.00 |
6.00 | 0.80 | 4.40 |
8.00 | 1.00 | 6.00 |
Common Cryocooler & Hydrogen Industry Sizes
Size |
0.8 × 0.15 mm |
1.0 × 0.20 mm |
1.2 × 0.20 mm |
1.6 × 0.25 mm |
2.0 × 0.30 mm |
3.0 × 0.50 mm |
4.0 × 0.50 mm |
The tubing is engineered to deliver consistent performance in cryogenic operating environments. It maintains toughness and dimensional stability at temperatures down to -269°C, supporting long-term use in extreme low-temperature systems. For Joule-Thomson (JT) expansion systems and cryogenic refrigeration circuits, the precisely controlled inner diameter delivers stable flow restriction and fluid regulation.
Strict production control of outside diameter, inner diameter, and wall thickness ensures predictable flow characteristics across production batches. The selected alloy materials are compatible with helium, hydrogen, nitrogen, oxygen, and other common cryogenic media. For high-purity gas systems, Bright Annealed (BA) and Electropolished (EP) surface finishes are available with controlled surface roughness levels. The base material is compatible with orbital welding and automated assembly processes for streamlined production integration.
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All incoming raw materials undergo mill test certificate verification, heat number traceability, positive material identification (PMI), and chemical composition analysis to confirm full compliance with specified material grades.
100% dimensional inspection is performed on every tube, covering outside diameter, inner diameter, wall thickness, and length. Additional geometry inspection includes ovality check, concentricity measurement, straightness inspection, and end preparation inspection, with typical dimensional tolerances of ±0.01 mm for both OD and WT. Mechanical testing covers tensile strength, yield strength, elongation, hardness, flattening, and flaring properties to verify structural performance under cryogenic and pressure conditions.
Non-destructive testing methods include eddy current testing (ECT), ultrasonic testing (UT), and penetrant testing (PT) for assembled components. Pneumatic pressure test and hydrostatic pressure test are conducted to verify pressure resistance and sealing performance.
For hydrogen and helium applications, oil-free verification, grease-free verification, particle-free inspection, and clean packaging inspection are carried out to meet high-purity system requirements. All orders are supplied with full documentation, including EN10204 3.1 material certificate, PMI report, dimensional inspection report, mechanical test report, surface roughness report, and NDT report.
Cryogenic capillary tubes are deployed across multiple industrial sectors. In cryocooler manufacturing, they act as precision flow restriction tubes and heat transfer channels in Gifford-McMahon (GM), pulse tube, and Stirling cryocoolers. They also support cryopump systems for semiconductor manufacturing, display panel production, and vacuum coating equipment.
In hydrogen energy systems, the tubing integrates into liquid hydrogen (LH₂) liquefiers, hydrogen refueling stations, storage systems, compressor systems, and fuel cell test platforms. It also serves helium refrigeration setups including recovery units, circulation systems, and cooling equipment. Additional use cases include rocket propulsion systems, cryogenic fuel transfer lines, and satellite thermal control systems in aerospace; particle accelerators, superconducting magnets, and quantum computing cooling systems in scientific research; and MRI cooling and cryogenic medical storage in medical equipment.
Cryogenic capillary tubes are produced in TP316L stainless steel, Inconel 625, Incoloy 825, and Monel 400, all formulated for cryogenic service conditions.
The tubing supports an operating temperature range from -269°C to +600°C, retaining structural properties across extreme temperature fluctuations.
Available surface finishes include BA, EP, and pickled. BA surface has a typical roughness of Ra ≤ 0.8 μm, standard EP surface has Ra ≤ 0.4 μm, and high-purity EP surface reaches Ra ≤ 0.25 μm.
Each order is supplied with EN10204 3.1 material certification and complies with PED 2014/68/EU. Full inspection reports covering PMI, dimensional, mechanical, and NDT items are also included.
For custom dimension requests or project-specific consultation, commercial procurement teams can contact Huashang Steel for tailored support.
