Medium-Length Stainless Steel Coil Tube (100 m – 500 m/Coil)
Product Overview
The Medium-Length Stainless Steel Coil Tube (中长盘) is a precision-engineered coiled tubing product manufactured by Wenzhou Jixing Metal Materials Co., Ltd. This product is specifically designed to deliver optimal coil lengths ranging from 100 meters to 500 meters per coil, representing the mainstream length specification for industrial heat exchanger applications and instrument piping systems. The medium-length coil format strikes a critical balance between material efficiency, handling convenience, and application versatility, making it the preferred choice for high-volume manufacturing environments and complex system integrations.
Unlike short coils (under 100 m) or long coils (exceeding 500 m), the medium-length format minimizes material waste during cutting and fabrication while reducing the frequency of coil changes during continuous production runs. This translates directly into lower operational costs and improved throughput for end users in the industrial process engineering sector.
Material & Properties
Wenzhou Jixing Metal Materials Co., Ltd. produces medium-length coil tubes from a comprehensive range of austenitic and duplex stainless steel grades, each selected to meet specific performance requirements:
- Austenitic Grades (奥氏体不锈钢): SUS304 (1.4301), SUS304L (1.4307), SUS316 (1.4401), SUS316L (1.4404), SUS321 (1.4541), SUS316Ti
- Super Austenitic Grades (超级奥氏体不锈钢): SUS317L (1.4438), 254 SMO (1.4547), Alloy 625 (UNS N06625)
- Duplex Grades (双相不锈钢): SUS316L/2205 (1.4462), 2507 (1.4410)
- Key Mechanical Properties: Tensile Strength (抗拉强度) ≥ 520 MPa (SUS304), ≥ 570 MPa (SUS316L); Yield Strength (屈服强度) ≥ 205 MPa; Elongation (延伸率) ≥ 40%
- Corrosion Resistance (耐腐蚀性): Excellent resistance to pitting (点蚀), crevice corrosion (缝隙腐蚀), and stress corrosion cracking (应力腐蚀开裂) in aggressive chemical and marine environments
Specifications
| Parameter (参数) | Specification (规格) | Standard (标准) |
|---|---|---|
| Coil Length (盘管长度) | 100 m – 500 m per coil (每卷) | Custom (定制) |
| Outer Diameter (外径, OD) | 3.175 mm – 50.8 mm (1/8" – 2") | ASTM A778 / GB/T 12771 |
| Wall Thickness (壁厚) | 0.3 mm – 3.0 mm | ASTM A778 / GB/T 12771 |
| Coil Inner Diameter (盘管内径) | 200 mm – 600 mm (adjustable) | Custom (定制) |
| Surface Finish (表面光洁度) | No. 4 Polish (4K), Electropolished (电解抛光), Matte (哑光) | Ra ≤ 0.4 μm (electropolished) |
| Tolerance (公差) | ±0.05 mm (OD), ±10% (wall thickness) | ASTM A778 |
| Material Grades (材质牌号) | SUS304, 304L, 316, 316L, 321, 317L, 2205, 2507, Alloy 625 | ASTM / EN / GB |
| Packaging (包装) | Wooden pallet with protective wrapping; export-grade available | ISO 17642 |
Manufacturing Process
The production of medium-length stainless steel coil tubes at Wenzhou Jixing Metal Materials Co., Ltd. follows a rigorously controlled multi-stage manufacturing process:
- Hot Rolling (热轧): Continuous casting and hot rolling of stainless steel slabs into strip stock with controlled chemical composition and grain structure.
- Pickling & Annealing (酸洗退火): Removal of mill scale and stress relief through controlled thermal cycling in protective atmosphere furnaces to ensure uniform microstructure and corrosion resistance.
- Cold Rolling (冷轧): Precision reduction of strip thickness to target wall thickness specifications using high-precision rolling mills with real-time gauge control systems.
- Coil Forming & Pipe Making (卷制成型): Strip is formed into tube blanks and welded using automatic orbital TIG welding (自动轨道TIG焊接) with inert gas shielding (氩气保护) to ensure seam integrity and minimal heat-affected zone (热影响区) distortion.
- Heat Treatment (热处理): Solution annealing (固溶处理) at 1050°C – 1150°C followed by rapid quenching to restore full austenitic structure and maximum corrosion resistance.
- Coil Winding & Length Control (盘绕与长度控制): Precision winding to achieve target coil lengths of 100 m – 500 m using computerized length measurement and tension control systems.
- Final Inspection (最终检验): Comprehensive quality verification including dimensional measurement, spectroscopic analysis (光谱分析), hydrostatic testing (水压试验), and surface inspection.
Applications
The medium-length coil tube (100 m – 500 m/coil) is the dominant specification across multiple high-demand industrial sectors:
- Industrial Heat Exchangers (工业换热器): The primary application for medium-length coils. Coils of 100 m – 500 m are ideal for manufacturing spiral heat exchangers (螺旋换热器), plate-and-frame heat exchanger tubes (板式换热器管), and shell-and-tube heat exchanger bundles (管壳式换热器管束). The length range minimizes the number of weld joints per unit, ensuring thermal efficiency and structural integrity.
- Instrument Piping (仪表管路): Medium-length coils are the standard for process instrumentation lines, pressure gauge connections, control valve manifolds, and analytical instrument feed lines in chemical processing and petrochemical facilities.
- Petrochemical & Oil Refining (石油化工): Used in distillation columns, separation units, and catalyst delivery systems requiring high-temperature and high-pressure resistance.
- Pharmaceutical & Food Processing (制药与食品加工): Electropolished medium-length coils meet sanitary requirements for CIP (Clean-in-Place) and SIP (Sterilize-in-Place) systems.
- Power Generation (发电): Condenser tubes, feedwater systems, and steam distribution lines in thermal and nuclear power plants.
- Marine & Offshore (海洋工程): Seawater cooling systems, ballast water treatment, and subsea instrumentation requiring superior chloride resistance.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management systems and certifications to ensure product reliability:
- ISO 9001:2015 — Quality Management System (质量管理体系)
- ISO 14001:2015 — Environmental Management System (环境管理体系)
- ISO 45001:2018 — Occupational Health & Safety Management (职业健康安全管理体系)
- EN 10204 3.1 — Material Test Certificate (材料测试证书)
- ASME Section VIII — Pressure Vessel Code compliance for heat exchanger applications
- Pressure Vessel Inspection Agency (PVIA) — Third-party inspection certification
- DNV-GL — Marine and offshore industry approval
All medium-length coil tubes are accompanied by mill test certificates (MTC, 材质证明书) with full chemical composition analysis (化学成分分析), mechanical property data (力学性能数据), and traceability to the heat number (炉号追溯) of the original steelmaking process.
Unique Selling Points
- Optimal Length for Industrial Applications: The 100 m – 500 m range is specifically validated as the mainstream specification for heat exchanger manufacturing and instrument piping, offering the best balance of productivity, material utilization, and handling logistics.
- Minimized Joint Count: Longer coils per unit reduce the number of weld seams required per heat exchanger bundle or piping run, directly improving system reliability and reducing maintenance requirements.
- Precision Length Control: Computerized winding systems ensure coil length accuracy within ±1%, reducing offcut waste (余料损耗) and optimizing material cost per project.
- Full Material Traceability: Every coil is traceable from raw material ingot through all processing stages, ensuring compliance with stringent industry standards for pharmaceutical, nuclear, and aerospace applications.
- Customizable Specifications: Wenzhou Jixing Metal Materials Co., Ltd. offers flexible customization of outer diameter, wall thickness, surface finish, and coil inner diameter to meet project-specific engineering requirements.