Food Grade Stainless Steel Pipe

Shuangsen supplies Food Grade Stainless Steel Pipe from China factory direct. Internal mechanical polishing achieves Ra≤0.2µm with weld seam leveled and shadow-free. Full nitrogen shield welding and pure hydrogen annealing ensure weld zone strength matches base metal – tensile ≥690MPa, expansion >30%, flattening and flaring tests show no rupture. 1000h salt spray resistance verified. In-house NDT, hydrostatic testing, and roughness measurement per batch. ISO 13485 (medical), 9001, 14001, 45001 certified. Applications: dairy, pharmaceutical WFI/CIP, beverage, brewery, and cooling loops for HUAWEI/Envicool data centers.

Material selection and core process technology

Manufacturing of Food Grade Stainless Steel Pipe begins with 304, 304L, 316, or 316L coil – all sourced from mills with full traceable heat numbers. The production line integrates three proprietary technologies: online roundness control, internal weld leveling, and bright solid‑melting heat treatment. These steps determine final mechanical properties and surface integrity.

Tensile strength reaches 690 MPa minimum, expansion ratio exceeds 30%, and 1000h salt spray testing shows no surface corrosion. Weld seam areas are processed to match the base metal in strength and corrosion resistance. This Food Grade Stainless Steel Pipe is designed for high‑purity environments where crevice‑free surfaces and consistent weld quality are non‑negotiable.

Dimensional range – standard OD and wall combinations

Standard sizes for hygienic applications. Custom OD, wall, and length are available upon request.

Tolerances follow JIS G3447 or ASTM A269/A270 depending on specification. For non‑standard dimensions, drawings or detailed spec sheets are used to define requirements.

Surface integrity and weld zone characteristics

• Internal mechanical polishing – Ra ≤ 0.2 µm, weld path without shadow or discoloration
• Full nitrogen shield welding – prevents oxidation during welding
• Pure hydrogen annealing – restores corrosion resistance across the weld zone
• Internal weld leveling – eliminates crevices and bead traps that harbor bacteria
• Solid solution treatment – applied to every length for uniform grain structure
• No filler metal – autogenous welding ensures seam composition matches base alloy
• External finish options – mill, 180‑grit brushed, 320‑grit polished, or bright annealed
• Special roughness – Ra ≤ 0.1 µm achievable on request

Testing methods applied per batch

Every batch of Food Grade Stainless Steel Pipe undergoes the following verification procedures before release:

• Transverse and longitudinal pressure leveling – confirms ductility and weld integrity
• Reverse flattening test – detects any weld seam weakness
• Hydrostatic test or eddy current flaw detection – leak and defect screening
• Mechanical property verification – tensile, yield strength, elongation percentage
• Inner surface roughness measurement – Ra and Rz values recorded per ASTM B912

Each tube is fully traceable from coil heat number to final inspection. Factory test reports accompany every delivery. Third‑party inspection (SGS, BV, or similar) can be contracted at the factory.

Order specification fields – to be defined at order placement

1. Product name / designation
2. Material grade (304, 304L, 316, 316L)
3. Dimensions and tolerance class
4. Quantity (pieces or total length)
5. Packing method (bundles, crates, or custom)
6. Heat treatment condition
7. Testing method (hydrostatic, eddy current, etc.)
8. External surface finish requirement
9. Internal wall roughness requirement (Ra, Rz)
10. Any special marking or end protection

Application fields – direct industrial use

This tubing is installed in processes where surface finish and corrosion resistance are critical:

• Dairy, milk, and juice processing – raw milk conveyance, pasteurization loops, CIP return lines
• Pharmaceutical WFI and CIP/SIP systems – water‑for‑injection, clean‑in‑place, steam‑in‑place
• Beverage and brewery – beer, soft drinks, fermented product transfer
• AI data center cooling loops – used in HUAWEI and Envicool thermal management systems
• Potable water and heating pipe systems – residential and commercial plumbing

Reference case: A dairy processing facility in Zhejiang province replaced 1.2km of welded line with Shuangsen Food Grade Stainless Steel Pipe (316L, OD 76.2mm, wall 1.50mm) – after 18 months of operation, internal inspection showed no pitting or biofilm accumulation.

Compliance references and certifications

Active certifications: ISO 9001:2015 (Quality), ISO 14001:2015 (Environment), ISO 45001:2018 (Occupational Health and Safety), and ISO 13485:2016 (Medical Devices). National recognition: "Specialized, Refined, Unique and New" Little Giant Enterprise, National High‑Tech Enterprise.

Frequently asked operational questions

Q1: Can the Food Grade Stainless Steel Pipe be produced to non‑standard dimensions or special requirements?
Yes. Custom production covers special OD, wall thickness, length, tighter ovality or straightness tolerances, special surface finishes (matte, bright annealed, pickled), OEM marking (laser etching, stenciling), and specific end preparations (beveled, threaded, or plain). Drawings or detailed specification sheets are used for non‑standard orders. Minimum order quantity for custom items is flexible.

Q2: Is this a manufacturer or a trading operation?
Direct manufacturer. The facility operates 133 welded pipe lines and performs all key processes in‑house: coil slitting, forming, welding, leveling, heat treatment, polishing, and testing. Coils, plates, and rolls can also be supplied if required. No intermediary trading layer is involved.

Q3: Are samples available and what is the cost?
Samples are provided free of charge. The receiver covers the freight cost. Sample lead time is typically 5–10 working days, depending on size and surface requirement. Sample quantities up to 3 meters per size are available for evaluation.

Q4: Can the factory be visited or inspected remotely?
On‑site visits are welcome. For remote inspection, online video walkthroughs of the production line, testing lab, and packing area can be arranged. Real‑time quality data (test reports, gauge readings) can be shared during the visit.

Q5: What quality assurance procedures are in place?
Three inspection stages are applied: (1) incoming coil verification (chemical composition, surface condition), (2) in‑process checks (weld bead consistency, roundness, wall thickness), and (3) final inspection (NDT, mechanical tests, surface roughness, dimensional audit). A factory test report is issued per batch. Third‑party inspection (SGS, BV, or similar) can be contracted at the factory.

Q6: What is the typical delivery lead time?
Stock items (common sizes in 304/316): 3–10 days. Made‑to‑order (non‑standard dimensions, special material, or specific surface): 25–45 days. Large volume orders (>50 tons) may require 50–60 days depending on coil availability.

Q7: How is shipping arranged and what support is provided?
Long‑term freight forwarders provide competitive sea/air freight rates. Services include consolidation, container loading supervision, and customs clearance support. Delivery terms: FOB Ningbo/Shanghai, CIF, or EXW. For urgent orders, air freight can be arranged.

Q8: What if there is no previous import experience?
Full export documentation is provided: commercial invoice, packing list, bill of lading, certificate of origin, and test reports. Customs clearance guidance is offered. The forwarding partner assists with import procedures at the destination port.

Why this tubing is selected for sanitary and high‑purity lines

• 133 welded pipe lines with proprietary leveling and heat treatment equipment – high capacity and consistent output
• In‑house NDT and mechanical lab – reduces external dependency, accelerates batch release, and enables real‑time process adjustments
• ISO 13485 (medical devices) and national "Specialized and New" Little Giant recognition – validated quality system
• Proven 1000h salt spray resistance – suitable for humid, coastal, or outdoor installations without surface degradation
• Non‑standard sizes and gauges produced without minimum batch restrictions – flexibility for pilot lines or maintenance replacements
• Full documentation package – supports regulatory audits, FDA compliance, and end‑user quality requirements
• Direct factory pricing – no trading margin, transparent cost structure

Shuangsen Pipe Industry – National High‑Tech Enterprise. Building a world‑renowned Chinese pipeline brand. Every tube, from 19mm to 165mm OD, reflects 25 years of continuous process refinement and strict hygienic manufacturing discipline.