Stainless Steel Coil Tube (Coil Pipe) — Product No. 599
1. Product Overview
The Stainless Steel Coil Tube (Coil Pipe) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a continuously formed tubular product rolled into a compact coil configuration, designed for high-throughput processing and downstream fabrication. Unlike traditional straight-length stainless steel pipes, coil tubes offer significant advantages in material utilization, transportation efficiency, and automated forming capacity. This product is engineered to meet demanding requirements in infrastructure, energy, chemical processing, and construction industries where corrosion resistance, mechanical integrity, and dimensional precision are critical.
The coil tube product line draws upon advanced construction methodologies validated through large-scale horizontal coil pipe trials — including references to C120 High-Strength High-Performance Concrete 1800-meter Horizontal Coil Pipe Construction Technology Research — demonstrating proven capability in long-span, high-pressure applications requiring exceptional structural reliability over extended deployment distances.
2. Material & Properties
Stainless steel coil tubes are fabricated from austenitic, duplex, or super-austenitic stainless steel grades, selected according to the target application environment. Common material specifications include:
- 304 (UNS S30400) — General-purpose corrosion resistance; suitable for food-grade, pharmaceutical, and architectural applications.
- 316L (UNS S31603) — Enhanced pitting and crevice corrosion resistance due to molybdenum (Mo) addition; ideal for marine and chemical environments.
- 321 (UNS S32100) — Titanium-stabilized; excellent resistance to intergranular corrosion at elevated temperatures.
- Super Duplex 2205 (UNS S31803) — High yield strength (≥450 MPa) combined with superior chloride stress-corrosion cracking (SCC) resistance.
Key Mechanical Properties:
- Tensile Strength (UTS): 520–800 MPa (grade-dependent)
- Yield Strength (0.2% Offset): 205–450 MPa
- Elongation: ≥35% (minimum)
- Hardness: 150–250 HB (annealed condition)
- Operating Temperature Range: −196°C to +870°C (depending on grade)
3. Specifications
| Parameter | Specification Range | Standard / Reference |
|---|---|---|
| Outer Diameter (OD) | Φ6 mm – Φ325 mm | ASTM A213 / ASME SA-213 |
| Wall Thickness (WT) | 0.5 mm – 12.0 mm | ASTM A269 / ASME SA-269 |
| Coil Length (Continuous) | 50 m – 2,000 m | Manufacturer Specification |
| Coil Inner Diameter (Coil ID) | 500 mm – 1,500 mm | Customer Requirement |
| Surface Finish | No.1, 2B, BA (Bright Annealed), Pickled & Passivated | ASTM A480 |
| Tolerance — OD | ±0.5% to ±1.0% | EN 10216 / GB/T 14976 |
| Tolerance — Wall Thickness | ±10% (minimum) | ASTM A213 |
| End Condition | Plain, Beveled, or Threaded (upon request) | ASME B1.20.1 |
| Heat Treatment | Annealed, Solution Annealed, or Pickled & Passivated | ASTM A240 |
| Packaging | Wooden pallet, steel banding, moisture-proof wrapping | ISO 4180 (Packaging) |
4. Manufacturing Process
The production of stainless steel coil tubes at Wenzhou Jixing Metal Materials Co., Ltd. follows a rigorously controlled multi-stage process to ensure consistent quality and dimensional accuracy:
- Raw Material Procurement & Inspection — Ingot or hot-rolled coil sourced from certified mills; incoming material subjected to spectroscopic analysis (OES), mechanical testing, and visual inspection for surface defects.
- Hot Rolling / Forming — Steel strips or billets are hot-rolled to approximate dimensions, with controlled cooling rates to achieve desired grain structure and minimize residual stress.
- Seamless or Welded Tube Forming — Depending on specification, tubes are produced via seamless piercing (for high-pressure applications) or ERW (Electric Resistance Welded) / TIG welding with subsequent welding seam grinding.
- Pilot Rolling & Sizing — Precision pilot rolls reduce OD and wall thickness to final dimensions with tight tolerance control.
- Coiling — Finished tube is wound onto a pay-off reel at controlled tension to prevent deformation, kinking, or stress concentration at the coil core.
- Heat Treatment (Annealing) — Tubes are annealed in a protective atmosphere (vacuum or argon) to relieve residual stresses, restore full austenitic microstructure, and enhance ductility.
- Pickling & Passivation — Surface oxide scales are removed via acid pickling; a passive chromium oxide film is established to maximize corrosion resistance.
- Final Quality Control — Includes hydrostatic testing (per ASTM A213), dimensional verification, surface inspection, and non-destructive testing (EDDY current or ultrasonic).
- Packaging & Dispatch — Coils are secured on wooden pallets with protective wrapping and labeled per international shipping standards.
5. Applications
Stainless steel coil tubes find extensive use across multiple high-value industries:
- Infrastructure & Construction — Long-span horizontal coil pipe systems for structural applications, validated through large-scale trial programs (e.g., 1,800-meter horizontal coil pipe deployments with C120 high-performance concrete integration).
- Petrochemical & Energy — Heat exchanger tubes, condensers, and process piping in refineries and LNG facilities.
- Food & Pharmaceutical Processing — Hygienic-grade tubing for beverage, dairy, and pharmaceutical manufacturing lines.
- Automotive — Exhaust system components, fuel lines, and structural tubing requiring corrosion and heat resistance.
- Architectural — Decorative railings, structural supports, and facade systems.
- Marine & Offshore — Seawater cooling systems, ballast piping, and offshore platform components.
6. Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system and holds the following certifications to ensure product conformity:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001:2015 — Environmental Management System
- ISO 45001:2018 — Occupational Health & Safety Management
- NADCAP — Special Process Certification (where applicable for aerospace-adjacent applications)
- Mill Test Reports (MTR) — Provided with each batch, including chemical composition, mechanical properties, and heat treatment records
- Third-Party Inspection — Available via SGS, Bureau Veritas, or TUV upon customer request
7. Unique Selling Points
- Extended Continuous Length — Coil configurations up to 2,000 meters reduce joint requirements, minimize leak points, and lower installation labor costs.
- Proven Long-Span Performance — Technical methodology validated through 1,800-meter horizontal coil pipe construction trials demonstrates reliability in demanding infrastructure applications.
- Superior Material Utilization — Coil format eliminates cut-off waste common in straight-length pipe procurement, delivering cost savings of 5–15%.
- Multi-Grade Availability — Full range of austenitic, duplex, and super-austenitic grades accommodates diverse corrosion and mechanical requirement profiles.
- End-to-End Quality Traceability — From raw material spectroscopy through final packaging, each coil is traceable to its heat number and production parameters.
- Customization Capability — Flexible specifications for OD, wall thickness, surface finish, and end conditions to meet project-specific engineering requirements.
Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd.
Product Reference: No. 599 — Coil Tube (Coil Pipe)
Technical Classification: Reference Literature & Applied Construction Technology