Stainless Steel Coil Tube — Vertical Coil Tube Fuel Oil Heater Application
1. Product Overview
The Stainless Steel Coil Tube (Product No. 1122) is a precision-engineered heat exchange component manufactured by Wenzhou Jixing Metal Materials Co., Ltd. Designed specifically for vertical coil tube fuel oil heaters, this product combines superior thermal conductivity, exceptional corrosion resistance, and mechanical durability to deliver optimal performance in high-temperature industrial heating systems. The coil tube serves as the primary heat transfer element within fuel oil heater assemblies, facilitating efficient combustion gas-to-fluid heat exchange in demanding operational environments.
As a critical component in thermal management systems, the coil tube is engineered to withstand continuous exposure to high-temperature combustion gases while maintaining structural integrity and thermal efficiency over extended service life cycles. The product represents a convergence of metallurgical science and precision manufacturing, tailored to meet the rigorous demands of industrial process heating applications.
2. Material & Properties
The coil tube is fabricated from high-grade austenitic stainless steel, selected for its outstanding combination of mechanical strength, oxidation resistance, and thermal stability. The primary material specifications are as follows:
- Base Alloy: Austenitic Stainless Steel (e.g., SUS304 / SUS316L / 310S depending on application temperature)
- Chemical Composition: Contains chromium (Cr ≥ 18%), nickel (Ni ≥ 8%), and carbon (C ≤ 0.08%) to ensure corrosion resistance and weldability
- Mechanical Properties: Tensile strength (≥ 520 MPa), yield strength (≥ 205 MPa), elongation (≥ 40%)
- Thermal Properties: Thermal conductivity approximately 16.3 W/(m·K) at 20°C; stable thermal expansion coefficient up to 1100°C
- Corrosion Resistance: Excellent resistance to atmospheric corrosion, acidic media, and high-temperature oxidation
- Temperature Range: Operational service temperature from −196°C to 1150°C (depending on grade)
3. Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (盘管Coiltube) |
| Product No. | 1122 |
| Manufacturer | Wenzhou Jixing Metal Materials Co., Ltd |
| Material Grade | SUS304 / SUS316L / 310S (Customizable) |
| Outer Diameter (OD) | Φ6 mm – Φ50 mm (Customizable) |
| Wall Thickness | 0.5 mm – 3.0 mm |
| Coil Diameter | Φ100 mm – Φ800 mm (Configurable) |
| Coil Height | 300 mm – 3000 mm (Customizable) |
| Number of Turns | 10 – 200 turns (Application-dependent) |
| Surface Finish | Mirror polish / Matte / Pickled & Passivated |
| End Treatment | Flat cut / Beveled / Threaded / Flanged |
| Connection Method | Soldered / Welded / Flanged / Threaded |
| Operating Pressure | ≤ 1.6 MPa (Standard); ≤ 4.0 MPa (Reinforced) |
| Operating Temperature | Up to 1100°C (310S grade); Up to 870°C (304/316L grade) |
| Applicable Media | Fuel oil, thermal oil, water, steam, combustion gas |
| Standard Reference | GB/T 12771 / ASTM A213 / EN 10216-5 |
4. Manufacturing Process
The production of the Stainless Steel Coil Tube follows a rigorous multi-stage manufacturing process to ensure dimensional accuracy, structural integrity, and surface quality:
- Raw Material Selection: High-purity stainless steel wire rod sourced from certified mills, subjected to incoming inspection for chemical composition (spectroscopic analysis) and mechanical properties.
- Cold Drawing: Wire rod is cold-drawn through precision dies to achieve the required tube diameter and wall thickness with tight dimensional tolerances (±0.05 mm).
- Annealing: Tubes undergo solution annealing at 1050–1150°C followed by controlled cooling to restore ductility, relieve residual stresses, and achieve the desired microstructure.
- Precision Coiling: Using CNC-controlled coiling machines, the annealed tube is formed into the specified helical geometry with consistent pitch, uniform curvature radius, and minimal residual deformation.
- Heat Treatment (if applicable): Post-coiling stress-relief annealing to eliminate coiling-induced residual stresses and ensure dimensional stability during service.
- Surface Treatment: Pickling and passivation to remove scale and form a protective chromium oxide layer; optional polishing to mirror finish for hygienic or aesthetic requirements.
- End Preparation: Precision cutting, bevelling, or threading at tube ends to facilitate assembly and connection within the heater system.
- Quality Inspection: Comprehensive testing including dimensional verification, hydrostatic pressure testing, visual inspection, and material certification validation.
5. Applications
The Stainless Steel Coil Tube (No. 1122) is designed for integration into vertical coil tube fuel oil heaters and serves a broad spectrum of industrial applications:
- Industrial Process Heating: Thermal oil heating systems for chemical reactors, distillation columns, and polymerization processes
- Boiler Systems: Auxiliary heating elements in industrial boilers and waste heat recovery systems
- Food Processing: Heating elements in food-grade thermal systems requiring hygienic-grade stainless steel (SUS316L)
- Petrochemical Industry: Fuel oil preheating, crude oil warming, and process stream heating
- Pharmaceutical Manufacturing: Steam generation and process heating in cleanroom environments
- Textile Industry: Hot air furnaces and drying equipment requiring reliable thermal transfer
- HVAC Systems: Commercial and industrial heating, ventilation, and air conditioning heat exchangers
- Marine Applications: Marine boiler auxiliaries and onboard heating systems requiring corrosion-resistant components
6. Quality Certifications & Standards
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management system ensuring product conformity with international standards:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001:2015 — Environmental Management System Certification
- GB/T 12771 — Chinese National Standard for Welded Stainless Steel Tubes
- ASTM A213 — American Standard for Seamless Austenitic Stainless Steel Tubing
- EN 10216-5 — European Standard for Stainless Steel Tubes for Heat Exchangers
- JIS G3459 — Japanese Industrial Standard for Stainless Steel Tubes
- Pressure Vessel Code Compliance — ASME Section VIII Div.1 (where applicable)
7. Unique Selling Points
- Precision Engineering: CNC-controlled coiling ensures dimensional accuracy and geometric consistency critical for optimal heat transfer performance in vertical heater configurations.
- Extended Service Life: Superior oxidation resistance and thermal fatigue resistance significantly reduce maintenance intervals and total cost of ownership.
- Customizable Design: Flexible configuration options for coil diameter, height, turn count, and material grade to match specific heater designs and thermal load requirements.
- Vertical Orientation Optimization: Designed specifically for vertical installation, promoting natural convection and efficient gas flow patterns within the heater shell.
- Multi-Grade Availability: Material selection from SUS304 to 310S accommodates service temperatures up to 1100°C, covering the full spectrum of fuel oil heater applications.
- Traceable Quality: Full material traceability with mill certificates, heat treatment records, and test reports provided with each production batch.
Note: All specifications are subject to customization based on customer requirements. Wenzhou Jixing Metal Materials Co., Ltd provides engineering consultation and technical support for optimal coil tube integration into vertical fuel oil heater systems. For detailed design calculations, thermal performance analysis, or custom specifications, please contact the technical department directly.