Small-Diameter Stainless Steel Coil Tube — Compact Reel Configuration (ID ≥ 300 mm, OD ≤ 800 mm)
Product Overview
The Small-Diameter Stainless Steel Coil Tube offered by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered tubing solution supplied in a compact coiled configuration designed for applications where space constraints and installation accessibility are critical. With an inner coil diameter (ID) of 300 mm or greater and an outer coil diameter (OD) not exceeding 800 mm, this reel format is specifically engineered to facilitate manual pay-off and deployment in narrow passages, confined workspaces, and restricted-access construction environments.
Unlike large-diameter coil configurations that require mechanized pay-off equipment, the small coil tube eliminates the need for heavy machinery on-site, significantly reducing labor costs, equipment requirements, and installation complexity. This makes it an ideal choice for retrofit projects, indoor piping installations, and applications in densely built environments.
Material & Properties
Small-diameter coil tubes are manufactured from high-grade austenitic stainless steel, providing superior corrosion resistance, mechanical strength, and long-term durability. Available grades typically include:
- 304 / 304L — Excellent general-purpose corrosion resistance; suitable for food-grade, chemical processing, and architectural applications.
- 316 / 316L — Enhanced molybdenum content provides superior resistance to chlorides and acidic environments; ideal for marine and chemical industries.
- 321 — Stabilized against intergranular corrosion at elevated temperatures; suitable for high-temperature service.
- 310S — High-temperature oxidation resistance for demanding thermal applications.
The austenitic microstructure ensures excellent formability, weldability, and non-magnetic properties, while maintaining full mechanical integrity through cold-rolling and coiling processes.
Specifications
| Parameter | Specification |
|---|---|
| Coil Inner Diameter (ID) | ≥ 300 mm |
| Coil Outer Diameter (OD) | ≤ 800 mm |
| Tube Outer Diameter (Typical Range) | 6 mm – 50 mm (customizable) |
| Tube Wall Thickness (Typical Range) | 0.3 mm – 3.0 mm (customizable) |
| Surface Finish | No. 1 (industrial), 2B (cold-rolled), BA (bright annealed), or custom |
| Coil Length per Reel | 500 m – 2,000 m (configurable) |
| Pay-Off Method | Manual pay-off (no mechanized equipment required) |
| Standard Compliance | ASTM A269, ASTM A213, EN 10216-5, GB/T 12771 |
| Available Grades | 304, 304L, 316, 316L, 321, 310S, 904L, Duplex 2205 |
Manufacturing Process
The production of small-diameter coil tubes follows a rigorous multi-stage manufacturing sequence to ensure dimensional accuracy, surface quality, and mechanical consistency:
- Strip Selection & Inspection — Cold-rolled stainless steel strip is selected from certified mills and subjected to incoming quality inspections for thickness tolerance, surface defects, and chemical composition verification.
- Tube Forming — The strip is fed through precision forming stations (ERW, welded-and-annealed, or seamless processes) to produce the desired tube outer diameter and wall thickness with tight tolerances.
- Weld Seam Finishing (where applicable) — Welded tubes undergo internal grinding and external finishing to ensure a smooth, defect-free seam surface.
- Heat Treatment & Annealing — Tubes are solution-annealed to relieve residual stresses, restore full austenitic structure, and achieve the required mechanical properties.
- Precision Coiling — The formed and heat-treated tube is wound onto the compact reel (ID ≥ 300 mm, OD ≤ 800 mm) using controlled-tension coiling equipment to prevent kinking, ovality, or surface damage.
- Final Quality Control — Each coil undergoes dimensional verification (OD, wall thickness, straightness), surface inspection, pressure testing, and chemical/spectroscopic analysis.
- Packaging & Dispatch — Coils are wrapped in protective film or paper, strapped securely, and packaged for safe transportation.
Applications
The compact coil configuration of this product makes it uniquely suited for a wide range of applications where traditional straight-length pipe or large-diameter coils are impractical:
- Building Services & HVAC — Chilled water piping, heating systems, and air conditioning circuits in commercial and residential buildings, where installation in tight mechanical rooms or ceiling voids is common.
- Food & Beverage Processing — Sanitary piping in breweries, dairy plants, and food processing facilities where hygienic design and ease of installation in confined plant layouts are paramount.
- Pharmaceutical & Medical — Process piping for CIP (Clean-in-Place) systems, steam distribution, and instrument tubing in GMP-regulated facilities.
- Chemical & Petrochemical — Small-bore process lines, instrument connections, and utility piping in plant areas with restricted access.
- Marine & Offshore — Piping installations on vessels and offshore platforms where space is limited and manual handling is essential.
- Renewable Energy — Solar thermal systems, geothermal heat exchangers, and hydrogen fuel cell balance-of-plant piping.
- Retrofit & Renovation Projects — Replacing existing piping in existing structures where large coils cannot be maneuvered through narrow corridors, stairwells, or shafts.
Unique Selling Points
- Manual Pay-Off Capability — The compact reel dimensions (OD ≤ 800 mm) allow operators to manually unroll the tube without the need for expensive mechanized pay-off stands, reducing capital expenditure and on-site logistics complexity.
- Narrow Passage Installation — Ideal for threading through tight spaces, narrow corridors, ceiling cavities, and confined plant areas where large coils cannot be transported or deployed.
- Reduced Splicing & Waste — Continuous coil supply minimizes the number of weld joints and butt-weld connections, reducing leak points and installation time.
- Cost-Effective Deployment — Lower handling costs, fewer labor hours, and reduced equipment rental expenses translate to significant savings on total installed cost.
- Multi-Grade Availability — Available in multiple stainless steel grades to match specific corrosion, temperature, and mechanical requirements across diverse industries.
- Custom Coil Configuration — Wenzhou Jixing Metal Materials offers customizable coil lengths, tube dimensions, and surface finishes to meet project-specific needs.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system and ensures all products meet or exceed international standards:
- ISO 9001:2015 — Quality Management System certification
- ISO 14001 — Environmental Management System certification
- ISO 45001 — Occupational Health & Safety Management System certification
- CE / PED Compliance — European Pressure Equipment Directive compliance for pressure-rated applications
- Mill Test Certificates (MTC) — Full EN 10204 3.1 certification with chemical analysis and mechanical test data provided with every shipment
- Third-Party Inspection — Available upon request (SGS, Bureau Veritas, TÜV)
- Material Traceability — Heat-number traceability from raw material through to finished product
Conclusion
The Small-Diameter Stainless Steel Coil Tube from Wenzhou Jixing Metal Materials Co., Ltd. represents a purpose-engineered solution that bridges the gap between high-performance stainless steel tubing and practical on-site installation requirements. By delivering premium-grade material in a compact, manually deployable reel format, this product empowers contractors, engineers, and facility managers to tackle challenging installations with confidence, efficiency, and reduced cost — making it the preferred choice for projects where space is limited but performance is non-negotiable.