304 Liquid Cooling Pipe

304 stainless steel offers the best cost‑to‑performance ratio for liquid cooling applications using pure water, DI water, or glycol‑based coolants with low chloride content (typically < 200 mg/L Cl⁻). 316 stainless steel contains 2–3 % molybdenum, which provides superior resistance to pitting and crevice corrosion in high‑chloride environments (e.g., seawater cooling, coastal installations with salt spray). If your coolant system uses high‑purity water or glycol blends in a controlled indoor environment (data center, battery container), 304 is sufficient and more economical. china super tech offers both 304 and 316 options, and we help you select the right grade based on your actual operating conditions - not upselling you to a more expensive material you don't need.

The key difference is carbon content: standard 304 has C ≤ 0.08 %, while 304L has C ≤ 0.035 %. Lower carbon prevents sensitization - the formation of chromium carbides at grain boundaries during welding, which depletes chromium near the weld and can cause intergranular corrosion. china super tech supplies dual‑certified 304/304L material, meaning the carbon content meets the 304L limit while mechanical properties meet or exceed 304 requirements. You get the weldability of 304L and the strength of 304 in one product - this is our standard, not an upgrade.

Yes. china super tech has conducted 1,000‑hour continuous immersion testing in 50 % ethylene glycol / 50 % DI water at 80 °C, demonstrating negligible weight loss and no pitting corrosion. This test is far more demanding than typical ASTM A262 intergranular corrosion tests, which only evaluate the material's as‑delivered condition. Our test simulates years of service in an accelerated manner. Additionally, the ultra‑low carbon content of our dual‑certified 304/304L ensures that welded joints in the glycol circuit will not suffer intergranular attack - the most common failure mode in standard 304 pipes after welding.

china super tech and our 304 liquid cooling pipes are certified under:

ISO 9001:2015 - Quality Management System

ISO 14001:2015 - Environmental Management System

ISO 45001:2018 - Occupational Health & Safety

ISO 3834 - Welding Quality Requirements (essential for pipe assemblies with welded connections)

CE Marking - Compliance with EU directives

RoHS - Restriction of Hazardous Substances

EU Food‑Grade Certification - Confirming suitability for contact with potable water and food products

These certifications are audited and current, and we provide certificates with every shipment. This comprehensive certification portfolio is a significant differentiator - many pipe suppliers hold only ISO 9001, and some cannot even provide material traceability.

Our standard range covers OD Ø6–Ø50 mm with wall thickness 0.5–3.0 mm, in straight lengths up to 6 m and coiled form (for OD ≤ 12 mm) up to 18 m. Custom sizes outside this range can be produced - our in‑house die‑making capability allows us to manufacture non‑standard diameters from Ø4 mm to Ø60 mm with tooling lead time as short as 7 days. Contact our engineering team with your specific requirements for a prompt feasibility assessment and quotation.

This is a critical question that many overlook. china super tech 304 liquid cooling pipes undergo:

Bright annealing in hydrogen atmosphere - produces a clean, oxide‑free inner surface without the need for mechanical polishing (which can embed contaminants)

Acid pickling and passivation - removes any residual surface oxides and enhances the chromium oxide passive layer

Cleanroom packaging - pipes are purged with nitrogen, capped with clean end caps, and packed in sealed bags in a controlled environment

Optional electropolishing - for ultra‑high‑purity applications, further reducing surface roughness to Ra ≤ 0.2 μm and improving corrosion resistance

Why this matters: In liquid cooling systems, even micron‑scale particles can clog micro‑channel cold plates or act as nucleation sites for corrosion. Our process ensures clean, contamination‑free pipe internals from the factory - you don't need to spend hours flushing before commissioning.

For standard sizes and specifications, our MOQ is 500 kg per order (approximately 200–500 m depending on size). For custom sizes or special requirements, MOQ may vary - but we are flexible and have supported prototype quantities as low as 50 m for R&D projects. We understand that liquid cooling system development often requires iterative testing, and we support you from prototype through mass production. This flexibility comes from our vertically integrated production - we control the entire process from steel melting to finished tube, so we can adjust quickly.

Yes, china super tech provides finished pipe assemblies - this is one of our key competitive advantages. We can supply:

Pipes with orbital‑welded fittings (e.g., Swagelok‑type compression fittings, VCR fittings, flanges)

Bent and formed pipe spools with tight radii

Complete manifold assemblies with multiple branch connections

All assemblies are 100 % pressure tested and helium leak checked to 1×10⁻⁹ mbar·L/s when required

Most stainless steel pipe suppliers sell only raw tubes. By providing finished, tested assemblies, china super tech reduces your supply chain complexity, assembly labor, and quality risk. Our ISO 3834 welding certification ensures that every welded joint meets the highest international standards.