Stainless Steel Coil Tube — Special Packaging & Export-Grade Protection Solutions
Wenzhou Jixing Metal Materials Co., Ltd is a leading manufacturer and supplier of high-performance stainless steel coil tubes, serving global industrial markets with precision-engineered products and world-class packaging solutions. Our coil tube product line is designed to meet the most demanding requirements of international procurement, pharmaceutical, food processing, and energy sectors — with packaging integrity as a core value proposition.
Product Overview
Our stainless steel coil tubes are supplied in continuous, helically wound configurations optimized for downstream forming, bending, and coil-wound component fabrication. Available in a wide range of grades including 304, 304L, 316, 316L, 321, and 904L, these tubes deliver superior corrosion resistance, mechanical strength, and dimensional accuracy. Whether supplied as seamless drawn tubes or precision-welded coil stock, every product undergoes rigorous quality control from raw material through final packaging.
A critical differentiator in our offering is our specialized packaging program, engineered to preserve surface finish integrity, prevent contamination, and ensure safe global logistics — particularly for EP (Electropolished) tubes and export-grade shipments.
Material & Properties
- Grades Available: 304, 304L, 316, 316L, 321, 310S, 904L, 2205 Duplex, and custom alloys upon request
- Surface Finishes: Pickled, Bright Annealed, Mechanical Polish, Electropolished (EP), Mirror Finish
- Corrosion Resistance: Excellent resistance to pitting, crevice, and intergranular corrosion across a wide pH and temperature range
- Mechanical Properties: High tensile strength with excellent ductility, suitable for cold forming and deep drawing
- Hygienic Compliance: Available in sanitary-grade finishes meeting FDA, 3-A, and EHEDG standards
Specifications
| Parameter | Specification / Range |
|---|---|
| Outer Diameter | 6.0 mm – 168.3 mm |
| Wall Thickness | 0.5 mm – 12.0 mm |
| Coil Length | Custom — typically 5 m to 120 m per coil |
| Manufacturing Method | Seamless (Cold Drawn / Hot Formed) or Precision Welded (AFT/ERT) |
| Applicable Standards | ASTM A269, ASTM A312, EN 10216-5, GB/T 12771, ISO 13505 |
| End Condition | Plain end, Beveled, or Threaded (custom per customer requirement) |
| Acceptable Surface Roughness | Ra ≤ 0.5 μm (EP finish); Ra ≤ 1.6 μm (polished finish) |
| Temperature Range | -196 °C to +870 °C (grade-dependent) |
Manufacturing Process
Our coil tube production follows a tightly controlled multi-stage process to ensure dimensional precision and metallurgical integrity:
- Raw Material Selection: Certified stainless steel wire rod or bar stock from approved mills, verified by chemical composition analysis (OES) and mechanical testing.
- Tubular Forming: Seamless tubes are produced via cold drawing or rotary piercing; welded tubes utilize automatic frequency welding (AFT) or electron beam welding (ERT) for superior joint integrity.
- Heat Treatment: Solution annealing and controlled cooling to achieve required grain structure and corrosion resistance, with intergranular corrosion testing per ASTM A269.
- Surface Finishing: Acid pickling and passivation, followed by mechanical polishing, electropolishing, or mirror finishing as specified.
- Coiling: Precision coiling on calibrated mandrels to maintain ovality within tolerance and prevent surface marking or deformation.
- Final Inspection: 100% dimensional verification, hydrostatic or pneumatic pressure testing, and surface defect inspection via automated optical systems.
Special Packaging Requirements
Recognizing that packaging is a critical cost and quality factor — particularly for electropolished (EP) tubes and export shipments — Wenzhou Jixing Metal Materials offers a tiered packaging program designed to protect product integrity through every stage of global logistics. For EP tubes and export-grade coil tubes, packaging costs may represent 5%–10% of the total tube value, reflecting the premium protection required for high-value, surface-sensitive products.
Packaging Options:
- Wooden Crate Packaging: Heavy-duty export-grade wooden crates with internal cushioning, designed for sea-freight durability and customs compliance (ISPM-15 heat-treated lumber). Ideal for large-diameter coils and mixed-size shipments.
- Double-Layer Stretch Film Wrapping: Multi-layer industrial-grade polyethylene stretch film providing moisture barrier protection, UV resistance, and coil stability during transport. Applied with precision tension to prevent shifting.
- Clean Bag Packaging: Low-lint, non-shedding polyethylene or polypropylene bags for EP tubes and sanitary-grade coils, preventing particulate contamination and preserving electropolished surface quality.
- Vacuum Sealing: Full vacuum packaging for maximum oxidation prevention, moisture exclusion, and surface finish preservation. Particularly recommended for long-term storage, intercontinental shipping, and critical pharmaceutical applications.
Packaging Cost Considerations:
| Packaging Method | Typical Cost Impact (% of Tube Value) | Recommended Application |
|---|---|---|
| Standard Stretch Film Wrap | 1% – 3% | Domestic shipping, standard finish tubes |
| Wooden Crate + Film | 3% – 6% | Export shipments, large-diameter coils |
| Clean Bag + Vacuum Seal | 5% – 8% | EP tubes, sanitary/pharmaceutical grade |
| Full Export Package (Crate + Film + Clean Bag + Vacuum) | 8% – 10% | High-value EP export tubes, critical applications |
Applications
- Pharmaceutical & Biotech: EP coil tubes for fluid transfer, CIP/SIP systems, and bioreactor loops
- Food & Beverage Processing: Sanitary-grade coil stock for pasteurization, fermentation, and hygienic piping
- Chemical Processing: Corrosion-resistant coil tubing for reactor feed lines, heat exchangers, and transfer systems
- Oil & Gas: High-temperature and high-pressure coil tubing for subsea applications and well completions
- Heat Exchanger Manufacturing: Pre-coiled tube stock for spiral wound and shell-and-coil heat exchangers
- Medical Devices: Ultra-clean EP coils for endoscope tubing, surgical instrument channels, and implant manufacturing
- Automotive & Aerospace: Precision coil tubing for exhaust systems, fuel lines, and hydraulic components
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains comprehensive quality management systems and industry certifications to assure global buyers of product reliability and traceability:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001 — Environmental Management System
- ASME / NB — Authorized for pressure vessel and piping component fabrication
- EN 10204 Type 3.1 — Third-party mill test certification for all export shipments
- CE Marking — Compliance with European pressure equipment directives (PED 2014/68/EU)
- FDA 21 CFR Compliance — Food-grade and medical-grade surface certification
- 3-A Sanitary Standards — Dairy and food processing industry certification
- Mill Test Reports (MTR): Full chemical analysis (OES), mechanical test data (tensile, hardness), and dimensional verification provided with every shipment
Why Choose Wenzhou Jixing Metal Materials?
- Integrated Packaging Expertise: Our in-house packaging engineering team designs and executes custom packaging solutions tailored to product sensitivity, destination, and regulatory requirements — eliminating the need for third-party packaging coordination.
- Export-Grade Quality at Competitive Pricing: By optimizing packaging protocols and leveraging direct mill relationships, we deliver premium product protection without unnecessary cost escalation.
- Full Traceability: From raw material heat number to final coil identification, every tube is fully traceable with digital documentation and barcode/QR labeling.
- Custom Engineering Support: Our technical team provides packaging cost estimation, logistics planning, and specification guidance to minimize landed cost and delivery risk.
- Global Logistics Network: Established relationships with international freight forwarders and packaging material suppliers ensure reliable, on-time delivery to ports worldwide.
Note to Procurement Teams: When budgeting for stainless steel coil tube purchases — especially EP-finish or export-bound shipments — allocate 5%–10% of the tube value for specialized packaging to ensure product integrity upon arrival. Under-investing in packaging can result in surface damage, oxidation, or contamination that necessitates costly rework or rejection at the point of use.