In AI computing and hyperscale data center infrastructure,**High PurityStainless Steel Liquid Cooling Tubing/**Manifolds serve as the “circulatory hub” ensuring stable operation of server chips (CPUs/GPUs) under high power densities. As AI model training demands superior thermal management, traditional air cooling is rapidly being replaced. These tubes, typically manufactured to ASTM A270 or ASME-BPE standards, utilize 304L or 316L low-carbon stainless steel. Through precision Bright Annealing (BA) or Electropolishing (EP), the internal surface roughness (Ra) is controlled within 0.2μm to 0.5μm.
The primary value of these piping systems lies in theirextreme chemical stability and fluid purity. A mirror-smooth internal surface not only reduces fluid friction to enhance pumping efficiency but also fundamentally prevents metallic ion leaching or particle shedding. This contamination control protects the micro-channels of expensive server Cold Plates from clogging and maintains the low conductivity of coolants (e.g., DI water, glycol solutions), preventing thermal failure or electrical corrosion of high-value computing assets.
Core Functions Integrated with Stainless Steel Properties:
·Exceptional Chemical Inertness & Water Quality Stability: Liquid cooling loops often use Deionized (DI) water or glycol solutions. DI water is highly aggressive and can leach ions from common metals, increasing electrical conductivity. Stainless steel tubes (especially 316L) treated with advanced Passivation ensure a 15-year lifecycle without chemical reactions, preventing ion leaching that causes system short-circuits or electrochemical corrosion of chips.
·Extreme Internal Smoothness & PUE Optimization: Data centers strive for minimal Power Usage Effectiveness (PUE). Through precision Mechanical Polishing (MP) or Electropolishing (EP), the internal Ra value can reach a mirror finish (≤0.4μm). This smoothness significantly reduces the pressure drop throughout the circulation, allowing pumps to maintain required flow rates at lower power, directly optimizing the overall energy efficiency ratio.
·Superior Structural Strength & Leak-Free Reliability: Data center assets are high-value and sensitive to moisture. Stainless steel tubing offers robust pressure resistance and thermal stability, withstanding water hammer and stresses from thermal expansion. When paired with precision-controlled tolerances, it ensures a perfect seal with Quick Disconnect (QD) couplings, eliminating the risk of leaks and unplanned downtime.
·Standards
Compliance with ASTM A270 or ASME-BPE standards is mandatory. These standards define the micro-surface quality and dimensional precision necessary for high-purity fluid environments surrounding sensitive electronic components.
·Materials
304/304L: The mainstream choice for primary loops and general cooling circuits due to its structural strength.
316L (1.4404): Mandatory for secondary aseptic loops (chip-contact side). Its ultra-low carbon content and anti-pitting properties prevent ion leaching into Deionized (DI) water, which would otherwise increase conductivity or cause electrochemical corrosion.
·Surface Treatment
Internal surface roughness (Ra) must be stabilized between 0.25μm and 0.5μm. Electropolishing (EP) or Bright Annealing (BA) is used to create a dense, uniform passivation layer. This mirror finish minimizes flow resistance (optimizing PUE) and prevents micro-particles or biofilms from clogging the micron-sized channels in cold plates.
·Types
Precision Sanitary Welded Tubes: Must undergo Online Bright Annealing and internal bead leveling to ensure no welding slag or micro-burrs shed into the system.
Custom Manifold Assemblies: A unique product form for liquid cooling, requiring high-precision welding of headers and branches to ensure stable flow distribution and tight branch positioning tolerances.
·Compatibility
Tubes must undergo strict Degreasing/Oil-Free Treatment. No residual machining oil is permitted as it contaminates coolants. Furthermore, strict dimensional tolerance control is required for seamless compatibility with Quick Disconnect (QD) couplings to guarantee leak-free operation.
·Quality Inspection
Helium Leak Testing: Used for manifolds to detect molecular-level leak paths that standard hydrostatic tests might miss.
Conductivity Flush Testing: Monitoring the change in DI water conductivity after flushing the tubes to verify zero ion leaching.
Precision Tolerance Measurement: 100% inspection of OD and roundness to ensure zero-error assembly with critical liquid cooling components.
Yaolong Hygienic As a professional fluid solution provider for data center liquid cooling, we understand that the safety of high-value computing assets is the lifeline of your enterprise. We offer the following core support to meet the industry’s demands for high purity, longevity, and precision:
·Ultimate Purity & Oil-Free Control: We provide stainless steel tubing treated with precision Electropolishing (EP) and rigorous Degreasing/Cleaning. This ensures a mirror-like finish (Ra ≤ 0.25μm) and zero residual machining oils or micro-particles, eliminating the risk of cold plate micro-channel clogging and maintaining low-conductivity coolant operation.
·Total Leak-Free Assurance: For critical Manifold components, we provide high-precision dimensional control for seamless integration with Quick Disconnect (QD) couplings. Furthermore, we employ aerospace-grade Helium Mass Spectrometry Leak Detection, capable of identifying molecular-level leak paths that standard tests miss, ensuring zero-risk operation for the 10-15 year lifecycle of the data center.
·Customized Manifold R&D and Pre-fabrication: Utilizing advanced automatic TIG welding and precision bending, we offer bespoke services from initial design collaboration to pre-fabricated assemblies. Whether for compact CDU internal circuits or large-scale rack manifolds, we guarantee tight branch positioning tolerances, significantly improving on-site assembly efficiency and consistency.
·Compliance & Technical Support for Long-term Operation: We provide comprehensive Material Traceability Reports (MTR) and coolant compatibility test data to help your liquid cooling systems pass rigorous industry audits and efficiency tests. Our technical team offers cost-effective material selection advice for both primary and secondary loops, helping you achieve superior PUE metrics.
