Liquid Cooling Hard Tube
Liquid cooling hard tube is a precision stainless steel coolant line engineered for AI data centers, CDU systems, and energy storage thermal management. Available in 304 and 316L grades (ASTM A312, JIS G3459), with internal surface roughness control to Ra ≤0.4 μm, square tube options from...
Product Introduction
Liquid cooling hard tube is a precision stainless steel coolant line engineered for AI data centers, CDU systems, and energy storage thermal management. Available in 304 and 316L grades (ASTM A312, JIS G3459), with internal surface roughness control to Ra ≤0.4 μm, square tube options from 10×10 mm to 80×80 mm, wall thickness 0.5–3.0 mm, and lengths up to 6000 mm. Every tube passes 100% leak inspection under ISO 3834 welding standards before shipment.
ISO9001 · ISO14001 · ISO45001 · ISO3834 · CE · RoHS - 11+ years · 12,000 tons/year · 20+ countries · 600+ projects
[Get a Quote] - engineering reply within 24 hours
Welding Defect Risks
- Risk: Micro-leakage at weld zones causes system teardown and test cycle delays - a failed connection in a CDU loop can halt an entire server row
- Root cause: Inconsistent weld penetration from manual processes, which orbital welding eliminates through automated arc control
- Impact: Unplanned downtime in AI server cooling, where one leak forces coolant drain and full re-inspection
Batch Inconsistency
- Risk: Dimensional drift across batches (OD tolerance, wall thickness, interface position) breaks assembly fit with existing cooling modules
- Root cause: Uncontrolled forming parameters between production runs
- Impact: Field rework and installation inefficiency during mass production of liquid cooling systems
Compliance Documentation Gaps
- Risk: Missing material certificates, test reports, RoHS/REACH declarations, and ISO system documentation extends supplier qualification cycles
- Root cause: Suppliers without integrated quality management systems
- Impact: Delays in vendor approval and project procurement timelines
- If any of these sound familiar, liquid cooling hard tube was engineered to solve exactly these problems.
Core Differentiation vs Industry Conventional
| Dimension | This product | Industry conventional | Differential value |
| Internal surface roughness | Ra ≤0.4 μm via polishing, pickling, passivation | Ra 0.8–1.6 μm typical industrial finish | 50–75% smoother flow path; particle accumulation risk drops proportionally, verified per ISO 4287 |
| Welding process | ISO 3834-controlled processes incl. orbital welding, 100% leak test pre-shipment | Manual TIG with spot-check leak testing | Leak risk reduced from ~2% field failure rate to near-zero in hermetic cooling loops |
| Material certification | ASTM A312 / JIS G3459 verified, full MTR with each shipment | Grade claims without independent verification | Zero qualification risk when integrating into international systems |
| Dimensional stability | CNC-controlled forming, ±0.1 mm tolerance on square tube cross-section | ±0.5 mm typical for standard pipe mills | 4× tighter tolerance; drop-in fit with manifold and quick-connect interfaces |
| Supply capacity | 12,000 tons/year, integrated in-house process from coil to finished tube | External processing across multiple vendors | Single-point accountability; 30% faster delivery on urgent projects |
| Customization scope | 10×10 to 80×80 mm square, 0.5–3.0 mm wall, 6000 mm length, bent/manifold assemblies | Standard straight tube only | 1 vendor replaces 3; piping layout optimized without multi-supplier coordination |
| 3-year TCO | Lower total cost incl. zero rework, stable batch-to-batch performance | Higher hidden cost from rework, re-inspection, and field failures | ~15–20% total cost reduction despite potentially higher unit price |
Manufacturing Process
-
- Material Verification & Grade Control - spectrometer chemical composition check per batch; 304/316L selection matched to coolant environment
- High-Precision Tube Forming - CNC-controlled forming holds wall thickness uniformity and cross-section geometry for leak-free connections
- Controlled Welding Process - orbital welding with automated arc parameters ensures consistent penetration; TIG/laser options per joint design
- Internal Surface Optimization - polishing, pickling, passivation to achieve Ra ≤0.4 μm, reducing particle accumulation in coolant loops
- Customized Forming & Assembly - precision bending, manifold fabrication, and integrated assembly for space-constrained layouts
- Multi-Stage Quality Testing - dimensional measurement, weld inspection, surface verification, hydrostatic pressure test, and helium leak detection
- Clean Packaging - contamination-free wrapping prevents surface damage during transit, ready for direct system integration
Core Components
- Raw material: 304/316L stainless steel, sourced with full MTR documentation
- Welding system: Orbital welding equipment, automated parameter control
- Surface line: Polishing/pickling/passivation line for internal cleanliness
- Inspection tools: Spectrometer, roughness tester (per ISO 4287), helium leak detector
Quality Inspection
- Incoming inspection - chemical composition verification per ASTM A312 / JIS G3459
- In-process inspection - dimensional measurement at forming and welding stages
- Weld inspection - visual and penetrant testing per ISO 3834 requirements
- 100% leak test - hydrostatic pressure test + helium leak detection per customer spec
- Surface verification - roughness measurement per ISO 4287, cleanliness check
- Final approval - documented batch traceability from coil to finished tube
Defect rate: ≤0.3%. Third-party inspection: SGS/TÜV/BV available upon request.
Technical Specifications
| Category | Parameter | Value | Standard |
| Dimensional | Square tube size | 10×10 – 80×80 mm | Custom |
| Wall thickness | 0.5 – 3.0 mm | Custom | |
| Length | up to 6000 mm | Custom | |
| Chemical | C ≤0.030% (316L), Cr 16–18%, Ni 10–14%, Mo 2–3% | Per grade | ASTM A312 |
| C ≤0.08% (304), Cr 18–20%, Ni 8–10.5% | Per grade | JIS G3459 | |
| Mechanical | Tensile strength | ≥515 MPa (316L) | ASTM A312 |
| Yield strength | ≥205 MPa (316L) | ASTM A312 | |
| Surface | Internal roughness | Ra ≤0.4 μm | ISO 4287 |
| Integrity | Leak test | 100% pre-shipment | Custom spec |
Customization Capability
- Cross-section: 10×10 mm to 80×80 mm square tubes, custom rectangular profiles
- Wall thickness: 0.5–3.0 mm, custom tolerances down to ±0.05 mm
- Fabrication: Custom bends, manifolds, and pre-assembled liquid cooling assemblies
- Surface finish: Ra ≤0.4 μm internal, custom external finish options
Applications
| Industry | Typical Application | Recommended Spec | Operating Environment |
| AI data centers | Server liquid cooling loops, CDU connections | 316L, Ra ≤0.4 μm, custom bends | Glycol-based coolant, continuous 24/7 operation |
| Energy storage | Battery thermal management manifolds | 304/316L, square tube, welded assemblies | Cycling thermal load, vibration |
| Industrial cooling | Precision cooling systems, process fluid loops | 316L, pressure-tested, leak-checked | Corrosive media, high-pressure |
| Immersion cooling | CDU distribution lines, tank manifolds | 316L, custom length, clean finish | Dielectric fluid, long-term immersion |
Customer Cases
- AI data center (North America) - supplied 316L bent tubes for CDU retrofit · volume 40,000 pcs · 6 months · zero leak incidents across all installed units, verified by helium testing at commissioning
- Energy storage integrator (Europe) - customized 30×30 mm square manifolds · volume 8,000 sets · 4 months · dimensional acceptance rate 100%, no rework at assembly line
- Industrial cooling OEM (Southeast Asia) - 304 straight tubes for process loops · volume 120 tons · 12 months · batch-to-batch consistency maintained across 6 shipments, zero field failures reported
FAQ
Q1: What standards does liquid cooling hard tube comply with?
A: The product is manufactured per ASTM A312 and JIS G3459 for seamless and welded stainless steel pipe. Welding quality is managed under ISO 3834 certification, and the factory holds ISO9001, ISO14001, ISO45001, CE, and RoHS compliance. Material certificates (MTRs) with chemical composition and mechanical properties are provided with each shipment. This means your procurement and quality teams can complete supplier qualification without additional testing burden.
Q2: What is the minimum order quantity for liquid cooling hard tube?
A: MOQ is flexible depending on specification. Standard straight tube orders start from 500 kg. Customized bent tubes and manifolds typically require a 1,000-piece minimum or prototype-first arrangement. For new projects, we recommend starting with a sample order of 20–50 pieces to verify dimensions, surface finish, and leak-tightness before mass production. Sample lead time is 7 days.
Q3: What are the lead times for standard and customized orders?
A: Standard product lead time is 7–15 working days. Customized bent tubes and assemblies require 15–25 working days including drawing review and prototype confirmation. For urgent projects, expedited production can cut standard lead time by 30% - a 10-day standard order can ship in 7 days. Annual capacity of 12,000 tons means parallel orders run without queuing, so your timeline is not competing with other customers' volumes.
Q4: Which material grade should I choose - 304 or 316L?
A: Choose 316L when the coolant contains glycol, chlorides, or operates above 60°C - the molybdenum content provides pitting corrosion resistance that prevents micro-leakage over years of service. Choose 304 for pure water or deionized water loops where cost is the priority. If your system runs 24/7 in a data center environment with minimal maintenance windows, 316L is the safer long-term choice despite the higher unit price.
Q5: How do you guarantee leak-tightness before shipment?
A: Every tube undergoes 100% hydrostatic pressure testing at 1.5× the rated working pressure. Additionally, helium leak detection is available for hermetic cooling applications, with a sensitivity threshold of 1×10⁻⁸ mbar·L/s. Welding is performed under ISO 3834-controlled procedures using orbital welding technology, which eliminates human error in arc travel speed and filler feed. The combination of automated welding and 100% testing means field leak rates are statistically near zero.
Q6: Can you provide internal surface roughness of Ra ≤0.4 μm on all custom shapes?
A: Yes. The polishing, pickling, and passivation line handles both straight tubes and pre-bent components. For bent sections, surface treatment is applied after forming to ensure the entire internal surface meets Ra ≤0.4 μm. Roughness is verified per ISO 4287 using a profilometer. This level of cleanliness matters for two reasons: particle shedding is minimized (protecting pumps and valves), and biofilm growth is inhibited in long-running coolant loops.
Q7: What customization options are available for square tubes?
A: Square tubes are manufactured from 10×10 mm up to 80×80 mm cross-section. Wall thickness ranges 0.5–3.0 mm, and length extends to 6000 mm. We also produce custom bends, manifolds, and pre-assembled liquid cooling components. Tolerances down to ±0.05 mm on critical dimensions are available. Each custom project starts with a drawing review by our engineering team - we confirm dimension feasibility, welding access, and pressure rating before production begins.
Q8: What is the warranty period for liquid cooling hard tube?
A: Products carry a minimum 12-month warranty from shipment date against manufacturing defects including dimensional deviation, weld failure, and surface defects. For 316L series used in compatible coolant environments, we provide extended engineering recommendations for a 15-year design life. If any defect is confirmed during the warranty period, replacement units are shipped at no cost - freight and customs included. A manufacturer engineer responds to technical inquiries within 24 hours.
Hot Tags: liquid cooling hard tube, China liquid cooling hard tube manufacturers, suppliers, factory
You Might Also Like
Send Inquiry
