Stainless Steel Coil Tube — Industrial Flexible Tubing Solution

Product Overview

The Stainless Steel Coil Tube (Coiltube) is a precision-engineered flexible tubing product manufactured by Wenzhou Jixing Metal Materials Co., Ltd. Designed for demanding industrial applications, this coil tube combines superior mechanical strength, corrosion resistance, and thermal stability in a compact, space-efficient coiled configuration. The product is engineered to meet international standards for seamless and welded stainless steel tubing, offering reliable performance in high-pressure, high-temperature, and chemically aggressive environments.

The coil tube format provides significant advantages over straight-length tubing in terms of storage efficiency, material utilization, and downstream processing flexibility. The intelligent manufacturing and scheduling systems employed in production ensure consistent quality, optimized yield rates, and precise dimensional tolerances throughout the manufacturing lifecycle.

Material & Properties

Grade Options

Mechanical Properties (Typical for Grade 316L)

Chemical Composition (Grade 316L, wt%)

Performance Characteristics

Specifications

Parameter Specification Standard Reference
Product Type Stainless Steel Coil Tube (Coiltube) —
Manufacturing Method Seamless / ERW (Electric Resistance Welded) / Autoclaved Welded ASTM A269, A312, A249
Outer Diameter (OD) 1.5 mm – 168 mm (1/16" – 6.5") ASTM A269 Table 1–5
Wall Thickness 0.1 mm – 12.7 mm (0.004" – 0.5") ASTM A269 Table 1–5
OD Tolerance ±0.05 mm to ±0.5 mm (depending on diameter) ASTM A269
Wall Thickness Tolerance ±10% of nominal (minimum ±0.025 mm) ASTM A269
Coil Length Standard: 10 – 60 m per coil; Custom lengths available —
Coil Inner Diameter 150 mm – 600 mm (6" – 24") —
Surface Finish Pickled & Passivated, Polished (No. 4), Mirror (8K), Matte ASTM A480
Surface Roughness (Ra) 0.2 – 2.0 μm (depending on finish grade) ASTM A480
Heat Treatment Condition Annealed (Solution Annealed), Cold Worked ASTM A269
End Condition Plain End, Beveled, Threaded, Flanged, or Custom ASME B1.20.1
Maximum Working Pressure Up to 30 MPa (4350 psi) — grade and size dependent ASME B31.3
Minimum Bend Radius 3× OD (cold bending) —
Weight (Coil) 50 kg – 500 kg per coil (typical) —
Applicable Standards ASTM, ASME, EN 10216-5, EN 10217-7, JIS G3446 —
Custom Fabrication Cutting, bending, welding, forming, threading, machining available —

Manufacturing Process

Process Flow Overview

  1. Raw Material Procurement & Inspection: High-purity stainless steel billets or continuous casting slabs are sourced from certified mills. Incoming materials undergo rigorous spectrographic analysis (OES) and mechanical testing to verify chemical composition and metallurgical quality.
  2. Hot Rolling / Hot Extrusion: Billets are heated to 1100–1200°C and hot-rolled or hot-extruded into seamless tube blanks of the desired outer diameter and wall thickness. For welded tubing, hot-rolled strip is produced and slitted to precise width.
  3. Cold Drawing / Cold Rolling: Tube blanks are cold-drawn through precision dies or cold-rolled to achieve tight dimensional tolerances, improved surface finish, and enhanced mechanical properties. Multiple drawing passes may be employed for critical tolerance applications.
  4. Welding (for welded products): ERW (Electric Resistance Welding) or automatic orbital welding is performed with precise control of welding parameters (voltage, current, speed) to ensure full-penetration, defect-free weld seams. Back-purging with inert gas (argon or nitrogen) prevents internal oxidation.
  5. Heat Treatment (Solution Annealing): Tubes are annealed at 1010–1150°C followed by controlled cooling (air cooling or water quenching) to relieve cold-work stresses, restore full solution-annealed microstructure, and achieve maximum corrosion resistance. This step is critical for stabilizing the austenitic grain structure.
  6. Pickling & Passivation: Tubes are subjected to acid pickling (hydrofluoric/nitric acid bath or dip) to remove scale, discoloration, and surface contaminants. Subsequent passivation treatment forms a protective chromium oxide layer on the surface, enhancing long-term corrosion resistance.
  7. Surface Finishing: Depending on application requirements, tubes may undergo mechanical polishing, electropolishing, or chemical mirror finishing to achieve specified surface roughness values (Ra ≤ 0.2 μm for mirror finish).
  8. Coiling & Packaging: Finished tubes are coiled using precision winding equipment with tension control to prevent deformation or kinking. Coils are wrapped with protective film, placed in wooden or metal containers, and labeled with full traceability documentation.

Intelligent Scheduling & Production Optimization

Wenzhou Jixing Metal Materials Co., Ltd employs advanced intelligent scheduling systems for coil tube production lines, incorporating real-time monitoring, predictive maintenance algorithms, and anti-swing transfer mechanisms. These technologies minimize coil oscillation during transfer between processing stations, reduce material waste, and ensure consistent product quality throughout the production cycle. The intelligent system optimizes batch scheduling to maximize throughput while maintaining dimensional accuracy and surface quality standards.

Applications

Industrial Applications

Specialized Applications

Quality Certifications & Compliance

System Certifications

Product Certifications & Testing

Applicable Standards Compliance

Standard Description Applicability
ASTM A269 / ASME SA-269 Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for Chemical and Heat-Transfer Applications Chemical process, heat exchangers
ASTM A312 / ASME SA-312 Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for High Temperature Service
"Professional Coil Tubes, Professionally Made"
© 2026 Wenzhou Jixing Metal Materials Co., Ltd · This content is for technical reference only. Final order specifications are subject to the signed contract and mill test certificate.