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High Pressure Micro Tubing for sCO₂ Recuperators is engineered for supercritical carbon dioxide heat exchanger systems operating in high-pressure, high-temperature, and space-constrained environments. These precision micro tubes serve as core components of microtube recuperator cores, where high-pressure sCO₂ flows through small-diameter tubes while a secondary stream transfers heat across the tube wall. Huashang Steel supplies stainless steel, nickel alloy, and high-temperature alloy micro tubing for sCO₂ recuperator applications, with customizable outer diameter, wall thickness, length, surface finish, cleanliness, and inspection requirements aligned with customer drawings.
For microtube heat exchanger designs, high pressure micro tubing supports reduced heat exchanger volume and increased heat transfer density. The small-diameter structure enables efficient heat exchange between two fluid streams, fitting thermal management systems with strict space and weight constraints. This structure caters to system designs that pursue compact form factors while maintaining stable heat transfer performance.
This micro tubing applies to a range of industrial use cases, including supercritical CO₂ recuperators, sCO₂ Brayton cycle heat exchangers, and high-pressure microtube shell & tube heat exchangers. It also supports modular nuclear heat exchange systems, advanced power generation systems, waste heat recovery systems, aerospace propulsion heat exchangers, space vehicle combustion heat exchangers, high-temperature gas-to-gas heat exchangers, compact liquid-liquid heat exchangers, high-pressure CO₂ thermal management systems, research and pilot-scale energy systems, and high-efficiency compact recuperator cores.
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Three main material categories are available, with additional custom superalloy options provided based on specific project requirements.
Stainless steel grades include 316L / 316H, 304L, 321 / 321H, 310S, and 904L, suitable for moderate to high-temperature operating conditions with basic corrosion resistance demands.
Nickel alloy and high-temperature alloy grades cover Inconel 625 / UNS N06625, Inconel 600 / UNS N06600, Incoloy 800H / 800HT, Incoloy 825 / UNS N08825, and Hastelloy C276 / UNS N10276, selected for applications with elevated temperature and pressure loads.
Titanium options include Titanium Grade 2 and Titanium Grade 5, with customized titanium alloy micro tubing available for specialized project needs.
Parameter | Range |
OD | 0.2 - 6.0 mm |
WT | 0.02 - 1.50 mm |
Length | ≤12 mtrs |
Coil length | ≤ 500 m |
The micro tubing is available in straight and coil forms, with custom fabrication supported as per drawing or sample.
Multiple delivery conditions are offered to match different operational needs:
Heat treatment: Annealing/BA/Solution treated, stress released, QT
Material hardness: Cold hardened, half hardened, 1/4 hardened, soft, etc.
Surface condition: Pickled, passivated, bright, grinded, polished, cleaned, sanitary level, etc.
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Full-range inspection and quality control procedures are applied to verify dimensional accuracy, material integrity, and performance compliance.
Inspection items cover dimensional checks (outer diameter, inner diameter, wall thickness, length, ovality, straightness), surface and end quality checks (visual inspection, burr inspection, cleanliness inspection), and material verification (PMI testing, chemical composition test). Mechanical and performance tests include tensile test, hardness test, grain size inspection, surface roughness inspection, Eddy Current Testing, and Ultrasonic Testing when applicable. Pressure and leak tests such as hydrostatic pressure test, pneumatic pressure test, and air under water leak test are also conducted. High-temperature mechanical property tests and intergranular corrosion tests are available when required.
All products undergo 100% final inspection before shipment. EN 10204 3.1 material certificates are available for commercial procurement documentation.
The micro tubing is developed to address specific demands of sCO₂ recuperator systems:
Designed for compatibility with high-pressure sCO₂ operating conditions
Delivers high heat transfer surface area per unit volume, enabling compact and lightweight recuperator core designs
Corrosion and oxidation resistance corresponding to the selected material grade
Precision dimensional control with uniform wall thickness and smooth inner bore
Clean, burr-free tube ends for direct assembly
Customizable tube lengths to fit specific system layouts
Available materials include stainless steel (316L / 316H, 304L, 321 / 321H, 310S, 904L), nickel alloy & high-temperature alloy (Inconel 625 / UNS N06625, Inconel 600 / UNS N06600, Incoloy 800H / 800HT, Incoloy 825 / UNS N08825, Hastelloy C276 / UNS N10276), and titanium (Titanium Grade 2, Titanium Grade 5). Additional superalloys and customized titanium alloys can be provided based on project-specific requirements.
Custom sizes are produced strictly according to customer drawings. The standard available range covers outer diameter from 0.2 - 6.0 mm, wall thickness from 0.02 - 1.50 mm, straight tube length up to 12 mtrs, and coil length up to 500 m.
All products go through dimensional inspection, material verification, mechanical property testing, non-destructive testing, and pressure & leak testing. 100% final inspection is conducted before shipment, and EN 10204 3.1 material certificates can be provided for full quality traceability.
For industrial clients with specific sCO₂ recuperator project requirements, Huashang Steel accepts custom orders based on detailed drawings or sample specifications. Clients may submit their dimensional, material, and inspection requirements to receive a tailored micro tubing solution matching their system design needs.
