Seamless Copper Alloy Coil Tube (盘管)

Product Overview

The Seamless Coil Tube (盘管) is a continuously formed tubular product manufactured through advanced seamless tube drawing and coiling technology. Produced by Wenzhou Jixing Metal Materials Co., Ltd., this product series adheres to current industry standards for copper alloy seamless coil tubes and is designed for demanding thermal exchange, fluid conveyance, and refrigeration applications. Unlike traditional cut-to-length tubing, coil tubes are delivered in continuous wound coils, minimizing waste, reducing welding joints, and improving installation efficiency in heat exchanger manufacturing and process engineering.

Material & Properties

Seamless coil tubes are fabricated from high-purity copper alloys selected for superior thermal conductivity, corrosion resistance, and mechanical integrity. The primary material grades include:

Key material properties include thermal conductivity ranging from 390 to 401 W/(m·K) for pure copper grades, excellent resistance to dezincification in brass grades, and outstanding marine corrosion resistance in cupronickel alloys. Tensile strength typically ranges from 210 MPa (annealed) to 400 MPa (hard-drawn), with elongation values of 20–45% depending on temper condition.

Specifications

Parameter Specification Range
Outer Diameter (OD) 0.5 mm – 50.8 mm (0.020" – 2.0")
Wall Thickness 0.1 mm – 3.0 mm
Coil Length 50 m – 200 m per coil
Coil Inner Diameter (Winding ID) 100 mm – 400 mm
Temper Condition Hard (H), Half-Hard (1/2H), Soft (M/Annealed)
Surface Finish Bright annealed, polished, or as-drawn
Tolerance on OD ±0.05 mm – ±0.10 mm (per ASTM B151)
Tolerance on Wall Thickness ±10% of nominal
Applicable Standards ASTM B151, ASTM B176, GB/T 1174, GB/T 5231
Maximum Operating Temperature -196 °C to +250 °C (pure Cu); up to +300 °C (CuNi)
Maximum Operating Pressure Up to 4.0 MPa (dependent on wall thickness and grade)

Manufacturing Process

The production of seamless coil tubes follows a rigorous multi-stage manufacturing sequence:

  1. Raw Material Preparation: High-purity copper or copper alloy ingots are melted under controlled atmosphere conditions to minimize oxide inclusions. Billets are produced via continuous casting or ingot casting methods.
  2. Hot Extrusion: Preheated billets are hot-extruded through calibrated dies to produce seamless tube blanks with approximate dimensions. Temperatures are maintained between 800–1050 °C depending on alloy grade.
  3. Pilger Rolling / Cold Drawing: Hot-extruded blanks undergo cold drawing through a series of progressively reducing dies to achieve precise dimensional tolerances and desired wall thickness. This process also imparts the required mechanical strength through work hardening.
  4. Intermediate Annealing: Where necessary, tubes are annealed at 450–650 °C to relieve accumulated cold-work stresses and restore ductility for further reduction.
  5. Final Cold Drawing: Tubes pass through final drawing dies to achieve exact specification dimensions with tight tolerance control (±0.05 mm on OD).
  6. Final Annealing (if required): For soft-temper grades, tubes are bright annealed in a controlled hydrogen-nitrogen atmosphere to achieve fully recrystallized microstructure with maximum ductility.
  7. Coiling: Continuous-length tubing is wound onto precision mandrels using automated coiling equipment that maintains constant tension, ensuring uniform coil geometry and preventing surface damage.
  8. Quality Inspection: Every coil undergoes hydrostatic testing (per ASTM A530), eddy current testing for wall thickness verification, dimensional gauging, and visual surface inspection.

Applications

Seamless copper alloy coil tubes serve critical roles across multiple industrial sectors:

Quality Certifications

Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management systems ensuring full traceability and compliance:

Each production batch is accompanied by a mill test certificate (MTC) documenting chemical composition (per ASTM E415 spectrographic analysis), mechanical properties, hydrostatic test results, and dimensional verification data. Full heat-to-coil traceability is maintained throughout the production lifecycle.

Unique Selling Points