Stainless Steel Coil Tube — Length-to-Yield Optimization Series

Product Overview

The Stainless Steel Coil Tube (Coiltube) produced by Wenzhou Jixing Metal Materials Co., Ltd represents a high-efficiency, cost-optimized solution for industrial piping applications. This product line is specifically engineered around the principle that longer coil lengths directly translate to fewer butt welds and a significantly higher overall yield rate (综合成材率). By supplying coil tubes in extended lengths — such as 500 meters per coil versus standard 100-meter coils of identical specification — manufacturers and end-users achieve material savings of up to 8–12%, reduced labor costs associated with welding, and improved structural integrity through minimized joint interfaces.

This product falls under the category of Business Procurement — Cost Elements — Material Yield Rate (成材率), addressing one of the most critical economic factors in stainless steel pipe fabrication and installation.

Material & Properties

Coil tubes in this series are manufactured from premium austenitic and duplex stainless steel grades, ensuring superior corrosion resistance, mechanical strength, and long-term service life across demanding environments.

Specifications

Parameter Specification / Range Notes
Outer Diameter (OD) 6.0 mm – 219.1 mm Custom sizes available upon request
Wall Thickness 0.3 mm – 8.0 mm Conforms to ASTM A554 / A269
Coil Length (Standard) 100 m / 200 m / 500 m 500 m coils offer lowest unit cost
Coil Weight Up to 3,000 kg per coil Optimized for handling equipment
Material Yield Rate Improvement 8–12% vs. short-length coils Directly proportional to coil length
Joint Reduction Up to 80% fewer butt welds 500 m coil vs. 100 m coil (same run length)
Applicable Standards ASTM A554, ASTM A269, GB/T 12771, EN 10217 Certification available per order
Surface Treatment Pickled & Passivated (P&P) Optional: electropolished, satin
Unit Price Advantage 500 m coil < 100 m coil (same spec) Cost savings from reduced processing overhead

Manufacturing Process

The production of optimized-length stainless steel coil tubes follows a rigorous multi-stage process:

  1. Hot-Rolled Coil Slitting: Hot-rolled stainless steel strip (HRC) is slit to precise width tolerances (±0.05 mm) from certified mill coils.
  2. Forming & Welding: High-frequency induction welding (HFW) or orbital TIG welding is employed to form the tube from flat strip, with in-line optical seam inspection ensuring weld integrity.
  3. Piercing & Sizing: Multi-stand cold rolling reduces OD and wall thickness to target dimensions with controlled springback compensation.
  4. Heat Treatment: Solution annealing (1050–1150°C) followed by controlled cooling to achieve full austenitic microstructure and eliminate residual stresses.
  5. Pickling & Passivation: Acid immersion removes mill scale and weld discoloration; subsequent passivation establishes a protective chromium oxide layer.
  6. Coiling & Packaging: Tubes are coiled to target lengths (100 m / 200 m / 500 m) on precision pay-off reels, with protective wrapping and wooden or steel coil crates for shipping.

Key Technical Advantage: Length-to-Yield Relationship

Core Principle: The longer the coil tube length, the fewer the number of butt welds required during downstream fabrication, resulting in a proportionally higher comprehensive material yield rate (综合成材率).

This relationship is quantifiable and economically significant:

Applications

Quality Certifications

Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management system and holds the following certifications:

Unique Selling Points