Precision Smooth Liquid Cooling Pipes for OEM Thermal Management Systems
Engineered smooth-wall metal tubing designed for high-efficiency thermal transfer loops in industrial, server, and EV cooling systems. Fabricated from certified high-purity alloys, these tubes maintain consistent wall thickness and smooth internal surfaces to minimize fluid friction, prevent particulate trapping, and sustain operating pressures up to 15 MPa. Supplied in straight lengths or custom-formed configurations to match exact OEM routing requirements.
Product Types
Seamless Copper Cooling Tubes:
Manufactured from oxygen-free copper (C12200) offering high thermal conductivity (thermal conductivity greater than 390 W/m.K) for direct-contact cold plates and high-load heat exchangers.
Stainless Steel Liquid Lines:
Produced in 304L and 316L grades for glycol, deionized water, and dielectric fluid circuits requiring high corrosion resistance and chemical inertness.
Aluminum Cooling Tubes:
Extruded from 6063 or 3003 alloys for weight-sensitive applications, featuring anodized or untreated surfaces optimized for brazing and mechanical joining.
Inner-Grooved / Micro-Fin Variants:
Tubes featuring precision internal micro-structures that disrupt boundary layers to enhance turbulent heat transfer coefficient.
Technical Specifications
| Parameter | Specification |
| Outer Diameter (OD) | 3.0 mm to 50.8 mm |
| Wall Thickness (WT) | 0.3 mm to 3.0 mm |
| Length Options | Straight cuts from 100 mm to 6000 mm; coiled lengths up to 100 meters (soft-annealed condition) |
| Alloy Grades | C12200 (DHP Copper), UNS S31603 (316L), UNS S30403 (304L), Al 6063-T5 |
| Pressure Rating | Operating pressure up to 15 MPa; burst pressure verified according to size and wall thickness |
| Surface Roughness | Internal Ra less than or equal to 0.4 um; electropolished or mechanical bright-annealed |
| Tolerances | OD plus or minus 0.05 mm; WT plus or minus 0.03 mm (precision drawn class) |
Materials & Surface Finish
Material Certification:
All incoming raw materials supplied with Mill Test Certificates (EN 10204 3.1) verifying chemical composition and mechanical tensile properties.
Bright Annealing:
Controlled hydrogen atmosphere annealing eliminates internal oxidation and scaling, maintaining absolute surface cleanliness prior to drawing.
Passivation:
Stainless steel variants undergo nitric or citric acid passivation to form a uniform chromium-oxide protective layer against pitting and galvanic corrosion.
Degreasing:
Ultrasonic solvent cleaning removes residual drawing lubricants, ensuring total hydrocarbon residue levels below 5.0 mg/m2.
Performance Features
Low Friction Factor:
Controlled internal surface finish reduces pressure drop across long fluid loops, lowering pumping power requirements.
High Burst Resistance:
Homogeneous grain structure achieved via multi-pass cold drawing sustains high cyclic thermal and hydraulic stress.
Tight Bending Capability:
Ductile elongation properties permit tight-radius bending (down to 1.5 times OD) without wall wrinkling, ovality distortion, or micro-cracking.
Hermetic Integrity:
Zero porosity metal matrix prevents gas permeation in closed-loop dielectric fluid systems.
Data Center Liquid Cooling: Direct-to-chip cooling loops, server rack manifolds, and coolant distribution units (CDUs).
Electric Vehicle Powertrains: Battery pack thermal management plates, inverter cooling lines, and onboard charger heat sinks.
Industrial Laser Systems:
High-power fiber laser resonator cooling and optics temperature regulation loops.
Medical Equipment:
MRI gradient coil cooling and CT scanner tube thermal management assemblies.
Selection Guide:
Use copper for maximum thermal conductivity in standard water/glycol loops; select 316L for aggressive deionized water or chemical coolant environments; choose aluminum for weight-critical mobile or aerospace thermal systems.
Precision Drawing Benches: Multi-die cold drawing lines maintain strict cross-sectional concentricity and dimensional repeatability across production batches.
Eddy Current Testing: 100 percent inline non-destructive testing detects internal flaws, pinholes, and wall thickness irregularities in real-time.
Hydrostatic Pressure Testing: Sample batches subjected to sustained internal pressure testing at 1.5 times maximum working pressure for 60 seconds.
Cleanliness Inspection: Residual particle extraction testing and residue analysis verify compliance with semiconductor and server cooling cleanliness standards.
Certifications
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