Stainless Steel Coil Tube for Ultra-High-Pressure Construction Pumping Systems
Product Overview
The Stainless Steel Coil Tube (Coiltube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered continuous-length tubing product designed for demanding high-pressure fluid transport applications. This coil tube has been validated in the successful simulation of vertical pumping of high-strength, high-performance C130 concrete at a simulated height of 880 meters — one of the most extreme ultra-high-rise construction pumping scenarios to date. The product is supplied in continuous coil form, enabling seamless, joint-free installation that eliminates leak points and maximizes structural integrity under extreme hydraulic and hydrostatic pressure conditions.
The coil tube represents a critical component in modern ultra-high-rise construction logistics, where the transport of high-performance concrete (HPC) at pressures exceeding 100 MPa demands materials of exceptional mechanical strength, corrosion resistance, and fatigue durability.
Material & Properties
The stainless steel coil tube is fabricated from high-grade austenitic stainless steel, selected for its superior combination of yield strength, elongation, and resistance to aggressive chemical environments encountered in concrete pumping operations.
- Base Material: Austenitic stainless steel conforming to ASTM A312 / A312M or EN 10216-5 standards, with typical grades including 304 (UNS S30400), 316L (UNS S31603), and 321 (UNS S32100).
- Corrosion Resistance: Excellent resistance to chloride-induced pitting and crevice corrosion, critical for exposure to cementitious slurries containing alkali compounds and chloride admixtures.
- Mechanical Properties: Minimum tensile strength of 515 MPa (Grade 304) to 585 MPa (Grade 321); minimum yield strength of 205 MPa; minimum elongation of 40% (50 mm gauge length).
- Temperature Range: Operational from −196 °C to +870 °C (Grade 304), with Grade 316L maintaining stability up to +550 °C in reducing environments.
- Surface Finish: Available in 2B cold-rolled finish (Ra ≤ 0.8 μm), electropolished finish (Ra ≤ 0.4 μm), or passivated surface for enhanced corrosion protection.
- Non-Magnetic Property: Maintains austenitic non-magnetic characteristics after cold working, suitable for environments requiring electromagnetic compatibility.
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (盘管 / Coiltube) |
| Product Catalog No. | 752 |
| Manufacturer | Wenzhou Jixing Metal Materials Co., Ltd. |
| Outer Diameter (OD) | 12 mm – 114.3 mm (custom sizes available) |
| Wall Thickness | 0.5 mm – 8.0 mm |
| Coil Length | 100 m – 1,000 m per coil (continuous, joint-free) |
| Coil Inner Diameter (Winding ID) | 300 mm – 1,200 mm |
| Applicable Standards | ASTM A312 / A312M, EN 10216-5, GB/T 14976, GB/T 13296 |
| Material Grades | 304, 304L, 316, 316L, 321, 310S, 904L, 2205 (Duplex) |
| Maximum Working Pressure | Up to 150 MPa (subject to OD and wall thickness) |
| Tolerance (OD) | ±0.1 mm (precision grade); ±0.5% (standard grade) |
| Tolerance (Wall Thickness) | ±10% (standard); ±5% (precision) |
| End Condition | Plain end, beveled end, or threaded end (custom) |
| Heat Treatment | Solution annealed at 1050 °C – 1150 °C with water quench |
| Surface Treatment | 2B, BA (Bright Annealed), Electropolished, Passivated |
| Packaging | Wooden reel with moisture-proof wrapping and export-grade crating |
Manufacturing Process
The production of the stainless steel coil tube follows a rigorous multi-stage manufacturing pipeline designed to ensure dimensional accuracy, metallurgical homogeneity, and surface quality:
- Raw Material Selection: Virgin stainless steel strip is procured from certified mill sources, with each batch subjected to spectroscopic composition analysis (OES — Optical Emission Spectroscopy) to verify alloy chemistry compliance.
- Slitting and Leveling: The master coil is precision-slitted to the target width and passed through a multi-stand leveling mill to eliminate coil set and ensure flatness uniformity within 0.5 mm per meter.
- Forming (ERW or Seamless): The strip is formed into a tubular cross-section using either Electric Resistance Welding (ERW) with high-frequency induction heating and post-weld heat treatment, or seamless tube manufacturing via the PF (Pierce Form) or ADP (Autogenous Diffusion Welding Process) method for weld-free products.
- Solution Annealing: Formed tubing is solution-annealed at 1050 °C – 1150 °C followed by rapid water quenching to dissolve carbides, restore full austenitic structure, and relieve residual cold-work stresses.
- Pickling and Passivation: The annealed tube is acid-pickled (HNO₃/HF mixed acid) to remove oxide scale, followed by passivation treatment to establish a stable chromium oxide (Cr₂O₃) protective film.
- Precision Cold Drawing: Where tight tolerances are required, the tube undergoes cold drawing through precision dies to achieve final OD and wall thickness within specified tolerances.
- Coiling: The finished tubing is coiled onto precision-wound reels with controlled winding tension to prevent ovality, kinking, or inter-coil contact damage.
- Quality Inspection: Each coil undergoes Eddy Current Testing (ECT) for wall integrity, hydrostatic pressure testing at 1.5× working pressure for 30 seconds minimum, and dimensional verification via ultrasonic thickness gauging.
Applications
The stainless steel coil tube finds critical application across a broad spectrum of high-performance engineering sectors:
- Ultra-High-Rise Construction Pumping: Validated in the simulation of C130 high-performance concrete pumping at a vertical height of 880 meters — demonstrating the tube's capability to withstand extreme hydrostatic pressure, abrasive concrete slurry, and sustained cyclic loading in mega-project concrete delivery systems.
- Chemical Processing: Continuous coil supply for chemical transfer lines, reactor internals, and heat exchanger tube bundles in the petrochemical, pharmaceutical, and fine chemicals industries.
- Food and Beverage Processing: Electropolished coil tubing for hygienic-grade fluid handling in dairy, brewery, and pharmaceutical production lines (conforming to 3-A Sanitary Standards and EHEDG guidelines).
- Power Generation: High-temperature steam lines, supercritical boiler tubing, and condensate return systems in coal-fired, nuclear, and combined-cycle power plants.
- Oil and Gas: Subsea wellhead tubing, downhole instrumentation conduit, and offshore platform piping systems requiring corrosion-resistant materials in chloride-rich marine environments.
- Automotive and Aerospace: Fuel injection lines, exhaust system components, and hydraulic circuit tubing requiring fatigue resistance and lightweight construction.
- Medical Devices: Endoscopic instrument tubing, dialysis fluid lines, and surgical tool housings requiring biocompatibility and precision dimensions.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management infrastructure ensuring traceability and conformance to international standards:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001:2015 — Environmental Management System Certification
- ISO 45001:2018 — Occupational Health and Safety Management System
- EN 10204 Type 3.1 — Third-party inspection certification for product conformity
- Mill Test Certificates (MTC) issued in accordance with EN 10204 for every batch
- NDT (Non-Destructive Testing) — Full ECT and hydrostatic testing per ASTM A312 requirements
- API 5L / API 5CT compliance available for oil and gas sector applications
- CE Marking — Conformity with European Pressure Equipment Directive (PED 2014/68/EU)
- CRN (Certificate of Registration for Nuclear) — Available upon request for nuclear-grade applications
Unique Selling Points
The stainless steel coil tube from Wenzhou Jixing Metal Materials Co., Ltd. distinguishes itself through several key competitive advantages:
- Ultra-High-Pressure Validation: Uniquely proven in the successful simulation of C130 concrete pumping at 880 meters vertical height — a benchmark that few coil tube products can claim, demonstrating exceptional pressure containment and fatigue resistance.
- Continuous Joint-Free Supply: Available in coils up to 1,000 meters per reel, eliminating the need for field welding or mechanical couplings that introduce potential failure points in critical pumping and fluid transport systems.
- Full Grade Spectrum: Comprehensive material range from standard austenitic grades (304, 316L) to high-alloy (904L, 310S) and duplex (2205) stainless steels, enabling precise material selection for diverse service environments.
- Precision Tolerance Capability: Ability to deliver precision-grade tolerances of ±0.1 mm on OD and ±5% on wall thickness, meeting the exacting requirements of hygienic, aerospace, and medical applications.
- End-to-End Traceability: Full batch traceability from raw material mill certificate through final inspection, supported by digital quality documentation and third-party verification.