Stainless Steel Coil Tube (Coil Tubing) — Model No. 1388
Product Overview
The Stainless Steel Coil Tube (Coiltube), Catalog No. 1388, manufactured by Wenzhou Jixing Metal Materials Co., Ltd, is a precision-engineered continuous-length tubular product formed through cold-rolled and cold-drawn processes into a coiled configuration. This product is specifically designed for high-performance industrial applications, including stripping steam coil systems in petroleum refining, chemical processing, and environmental treatment installations. The coil tube delivers superior thermal conductivity, mechanical integrity, and corrosion resistance, making it an ideal solution for demanding process environments where reliability and longevity are paramount.
Unlike seamless or welded straight-length pipes, coil tubes offer distinct advantages in terms of material utilization efficiency, continuous forming capability, and adaptability to complex installation geometries. The coiled configuration also facilitates convenient storage, transportation, and on-site deployment, reducing installation time and labor costs.
Material & Properties
The coil tube is fabricated from high-grade stainless steel alloys conforming to international standards, with the following material grades available:
- AISI 304 / 304L (UNS S30400 / S30403) — General-purpose austenitic stainless steel with excellent corrosion resistance and formability.
- AISI 316 / 316L (UNS S31600 / S31603) — Enhanced resistance to chlorides and pitting corrosion due to molybdenum (Mo) addition.
- AISI 321 (UNS S32100) — Titanium-stabilized grade suitable for elevated-temperature applications.
- AISI 310S (UNS S31008) — High-temperature grade for extreme thermal environments.
Key material properties include:
- Corrosion Resistance: Outstanding resistance to atmospheric corrosion, chemical agents, and acidic/alkaline environments.
- Thermal Conductivity: High heat transfer efficiency, critical for steam coil heat exchange applications.
- Mechanical Strength: High tensile strength and yield strength at both ambient and elevated temperatures.
- Weldability: Excellent welding performance for field fabrication and connection to process equipment.
- Hygienic Surface: Low roughness surface finish suitable for sanitary and high-purity applications.
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (Coiltube) |
| Catalog No. | 1388 |
| Manufacturer | Wenzhou Jixing Metal Materials Co., Ltd |
| Outer Diameter (OD) | 6.0 mm – 114.3 mm (1/4" – 4-1/2") |
| Wall Thickness | 0.5 mm – 6.0 mm |
| Coil Width | Customizable, up to 3000 mm |
| Coil Weight | Typically 500 kg – 3000 kg per coil |
| Material Grades | 304, 304L, 316, 316L, 321, 310S, 2205 (Duplex) |
| Surface Finish | 2B, No.1, BA (Bright Annealed), Pickled, Polished (Ra ≤ 0.4 μm available) |
| Standard Length | Continuous coil (custom cut lengths available) |
| Applicable Standards | ASTM A269, ASTM A312, ASME SA-213, EN 10216-5, GB/T 12771 |
| Operating Temperature | -196 °C to +1100 °C (grade dependent) |
| Operating Pressure | Up to 40 MPa (depending on dimensions and grade) |
| Tolerance (OD) | ±0.05 mm to ±0.5 mm (per customer requirement) |
| Tolerance (Wall Thickness) | ±10% (standard) or ±5% (precision grade) |
Manufacturing Process
The production of the Stainless Steel Coil Tube follows a rigorous, multi-stage manufacturing workflow designed to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Selection: High-purity stainless steel slab or strip is sourced from certified mills, with full chemical composition and mechanical property verification via Spectroscopic Analysis (OES) and Positive Material Identification (PMI).
- Hot Rolling & Annealing: The steel strip is hot-rolled to approximate dimensions, followed by annealing to relieve internal stresses and refine grain structure.
- Pickling & Descaling: The hot-rolled strip undergoes acid pickling to remove oxide scale, restoring the passive chromium oxide layer essential for corrosion resistance.
- Cold Rolling: Precision cold rolling reduces the strip to target thickness with tight dimensional tolerances, improving mechanical strength and surface finish.
- Forming & Welding: The strip is formed into a tubular shape and longitudinally welded using Argon Arc Welding (TIG) or Resistance Welding, depending on the application. For seamless coil tubing, cold drawing through a die is employed.
- Heat Treatment: Solution annealing at temperatures between 1050 °C and 1150 °C, followed by rapid quenching, ensures uniform austenitic microstructure and optimal corrosion resistance.
- Precision Sizing: Final cold drawing or expansion processes achieve exact outer diameter and wall thickness specifications.
- Surface Finishing: Electropolishing or mechanical polishing may be applied to achieve specified surface roughness values.
- Coiling: The finished tubing is wound into coils on precision-controlled coilers to prevent deformation and surface damage.
- Quality Inspection: Comprehensive non-destructive testing (NDT) including Eddy Current Testing (ECT), Hydrostatic Testing, and Visual Inspection is performed on every coil before release.
Applications
The Stainless Steel Coil Tube (Model No. 1388) is widely deployed across multiple industrial sectors:
- Petroleum & Refining: Stripping steam coils in fractionating columns, distillation settlers, and atmospheric/vacuum distillation units. Specifically engineered for Settler Stripping Steam Coil Nozzle Retrofit applications where enhanced heat transfer and durability are required.
- Chemical Processing: Heat exchangers, reactor coils, condensate recovery systems, and chemical transfer lines handling aggressive media.
- Power Generation: Boiler tubes, superheater coils, economizer elements, and feedwater preheating systems.
- Pharmaceutical & Food Industry: Sanitary process piping, CIP (Clean-In-Place) systems, and heat transfer coils requiring hygienic-grade surfaces.
- Environmental Engineering: Flue gas desulfurization (FGD) systems, wastewater treatment heat recovery, and incinerator heat exchange components.
- Aerospace & Defense: Hydraulic lines, fuel systems, and thermal management coils requiring high strength-to-weight ratios.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management system ensuring full traceability and compliance with global standards:
- ISO 9001:2015 — Quality Management System certification
- ISO 14001 — Environmental Management System certification
- EN 10204 — Type 3.1 Mill Test Certificates (MTC) provided for every batch
- ASTM International — Compliance with ASTM A269, A312, and A213 specifications
- ASME — Conformance with ASME SA-213 and SA-269 for pressure-containing applications
- PED (EU 2014/68/EU) — Pressure Equipment Directive compliance for European market
- API — American Petroleum Institute standards for oil and gas applications
- NACE MR0175 / ISO 15156 — Resistance to sulfide stress cracking for sour service environments
Unique Selling Points
- Superior Thermal Performance: Engineered for maximum heat transfer efficiency in steam coil and heat exchanger applications, with optimized wall thickness-to-diameter ratios.
- Extended Service Life: Premium alloy composition and controlled heat treatment deliver exceptional resistance to corrosion, scaling, and thermal fatigue.
- Precision Dimensional Control: Tight manufacturing tolerances ensure seamless integration into existing process equipment, including retrofit applications.
- Full Traceability: Each coil is accompanied by comprehensive documentation including chemical analysis, mechanical test results, and heat number tracking.
- Customization Capability: Flexible manufacturing capacity supports custom dimensions, surface finishes, and material grades to meet project-specific requirements.
- Cost-Effective Solution: Continuous coil configuration reduces material waste and installation costs compared to straight-length alternatives.
Note: All specifications are subject to verification based on the specific material grade, dimensions, and application conditions. Customers are advised to consult with Wenzhou Jixing Metal Materials Co., Ltd technical engineering team for application-specific guidance and material selection recommendations.