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Microtube Heat Exchanger Core Tubes are precision small-diameter tubes engineered for compact and high-performance heat exchanger cores. In typical configurations, hundreds or thousands of these micro tubes are assembled between tube sheets to form heat transfer cores. One fluid flows inside the tubes while another fluid flows across the outside. The small tube diameter creates a high surface-area-to-volume ratio, enabling thermal performance in compact and lightweight structures. These tubes serve commercial procurement needs across multiple industrial sectors.
Microtube core tubes allow heat exchanger manufacturers to build smaller and lighter heat exchanger cores compared with conventional large-diameter tube designs. This characteristic supports applications in aerospace, racing, defense, compact thermal systems, and high-performance cooling.
The small outer diameter of micro tubes increases the heat transfer surface area within a limited volume. This characteristic contributes to improved heat transfer efficiency and supports compact heat exchanger designs.
Precision control of inner diameter, wall thickness, roundness, and inner surface finish helps maintain smooth fluid flow. This feature benefits radiators, intercoolers, oil coolers, condensers, evaporators, and air-side cooling systems.
Micro tubes function as small pressure vessels inside heat exchanger cores. With appropriate material selection, wall thickness control, and pressure testing, they operate in high pressure heat exchangers, supercritical CO₂ systems, hydrogen systems, and aerospace thermal management systems.
Nickel alloy micro tubes including Inconel 625, Inconel 600, Inconel 601, Incoloy 800, Incoloy 825, and Hastelloy C276 provide high-temperature strength, oxidation resistance, and corrosion resistance for high temperature heat exchangers.
316L stainless steel and nickel alloy micro tubes operate in cryogenic recuperators, LNG systems, hydrogen cooling systems, and low-temperature heat exchangers. They offer low-temperature toughness, clean internal surfaces, and leak-tight performance.
Depending on working fluid and environment, stainless steel, duplex stainless steel, nickel alloy, or titanium can be selected to resist corrosion from oil, gas, coolant, seawater, chemical media, refrigerants, and cryogenic fluids.
Microtube heat exchanger core tubes require dimensional consistency for tube sheet assembly, welding, brazing, sealing, or other joining processes. Production focuses on tight OD tolerance, stable wall thickness, straightness, burr-free ends, and clean surface condition.
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Parameter | Range |
OD | 0.2 - 6.0 mm |
WT | 0.02 - 1.50 mm |
Length | ≤12 mtrs |
Coil length | ≤ 500 m |
Available types include straight and coil forms. Fabrication can be performed as per drawing or sample. Delivery conditions include various heat treatments (annealing/BA/solution treated, stress released, QT), material hardness levels (cold hardened, half hardened, 1/4 hardened, soft), and surface conditions (pickled, passivated, bright, grinded, polished, cleaned, sanitary level).
Material | Suitable Applications |
304 / 304L Stainless Steel | General cooling systems, compact heat exchangers, low-corrosion environments |
316L Stainless Steel | Cryogenic service, oil coolers, condensers, evaporators, hydrogen-related systems, clean heat exchanger cores |
321 Stainless Steel | High temperature heat exchangers and oxidation-resistant applications |
310S Stainless Steel | High temperature heat transfer systems |
Duplex 2205 | High strength and chloride corrosion resistance |
Super Duplex 2507 | Seawater, offshore, and severe corrosion environments |
904L Stainless Steel | Strong acid and chemical heat exchanger environments |
Inconel 625 | High pressure, high temperature, aerospace, supercritical CO₂, bleed air coolers |
Inconel 600 / 601 | High temperature oxidation-resistant heat exchangers |
Incoloy 800 / 825 | High temperature and corrosive fluid heat exchangers |
Hastelloy C276 | Severe corrosion, chemical processing, acid-resistant heat exchangers |
Titanium Grade 2 / Grade 5 | Lightweight, seawater, chemical, and aerospace heat exchanger applications |
These tubes serve as heat transfer core tubes in radiators, coolant-air intercoolers, and oil coolers for lubricating oil, hydraulic oil, and fuel-oil systems. They also operate in oil-air heat exchangers, high pressure/high temperature heat exchangers, cryogenic recuperators, and bleed air coolers for aerospace systems. Additional applications include condensers and evaporators for refrigerant systems, phase change material heat exchangers for thermal energy storage, and microtube shell & tube heat exchangers for liquid-liquid, gas-liquid, high pressure, high temperature, and cryogenic heat transfer.
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Inspection Item | Purpose |
OD Inspection | Ensure accurate tube sheet assembly and sealing |
ID Inspection | Ensure stable flow rate and low pressure drop |
Wall Thickness Inspection | Ensure pressure resistance and dimensional consistency |
Roundness Inspection | Improve assembly accuracy and flow stability |
Straightness Inspection | Ensure smooth tube bundle assembly |
Length Inspection | Meet cut-to-length and tube sheet design requirements |
Surface Inspection | Check scratches, dents, oxidation, pits, and stains |
Inner Surface Cleanliness | Reduce contamination, blockage, and system failure risk |
Burr Inspection | Ensure burr-free tube ends for assembly and welding |
PMI Test | Verify material grade |
Chemical Composition Test | Confirm material compliance |
Mechanical Test | Check tensile strength, yield strength, and elongation |
Hardness Test | Confirm material condition where required |
Hydrostatic Pressure Test | Verify pressure resistance |
Air Pressure Test | Check leakage risk |
Eddy Current Testing | Detect surface and near-surface defects |
Ultrasonic Testing | Detect internal defects where applicable |
Clean Packaging Inspection | Ensure oil-free, dust-free, capped, and protected delivery |
Microtube Heat Exchanger Core Tubes are supplied according to customer drawings, samples, or technical specifications. Both small batch trial orders and mass production are available. Supply forms include straight length, cut-to-length, precision drawn, and thin wall micro tubes with burr-free ends, cleaned and capped. Personalized processing services include cutting, laser cutting, laser welding, bending, coiling, grinding, polishing, cleaning, end forming, hydraulic forming, flaring, flanging, chamfering, deburring, grooving, thread rolling, perforation, caps, CNC machining, and EDM drilling.
Straight micro tubes are available in lengths up to 12 meters. Coiled micro tubes can be supplied in lengths up to 500 meters.
Super Duplex 2507 stainless steel and Titanium Grade 2 / Grade 5 are suitable for seawater and offshore applications due to their corrosion resistance properties.
Available heat treatments include annealing/BA, solution treated, stress released, and QT (quenched and tempered). Material hardness options include cold hardened, half hardened, 1/4 hardened, and soft conditions.
