Stainless Steel Coil Tube (Coiltube) — Product Technical Specification
Product Overview
The Stainless Steel Coil Tube (Coiltube) is a precision-engineered continuous tubular product supplied in coil form, designed for high-flexibility, long-run applications where straight-length handling is impractical or economically disadvantageous. Manufactured by Wenzhou Jixing Metal Materials Co., Ltd., this product line integrates advanced cold-drawing and coiling technologies to produce uniform wall thickness, tight dimensional tolerances, and superior surface finish. The coil configuration enables seamless integration into continuous conveying systems, automated forming lines, and high-volume fabrication environments.
The coil tube form factor addresses a critical engineering challenge: the transportation and deployment of long-length tubing without the logistical constraints of straight-length handling. This is particularly significant in applications involving continuous pipeline systems, where the movement dynamics of traction steel wire ropes and drive wheel configurations directly influence operational efficiency and mechanical reliability.
Material & Properties
Base Materials
- Austenitic Stainless Steels: SUS304 (UNS S30400), SUS304L (UNS S30403), SUS316 (UNS S31600), SUS316L (UNS S31603), SUS321 (UNS S32100)
- Super-Austenitic Grades: SUS317L (UNS S31703), 904L (UNS N08904)
- Duplex Stainless Steels: 2205 (UNS S31803/S32205), 2507 (UNS S32750)
- Ferritic & Martensitic Grades: SUS409L, SUS410, SUS420 (as required by application)
Key Mechanical Properties (Typical — Annealed Condition)
| Property | SUS304 | SUS316L | 2205 Duplex |
|---|---|---|---|
| Tensile Strength (抗拉强度) — Rm (MPa) | ≥ 520 | ≥ 450 | ≥ 550 |
| Yield Strength (屈服强度) — Rp0.2 (MPa) | ≥ 205 | ≥ 170 | ≥ 450 |
| Elongation (延伸率) — A (%) | ≥ 40 | ≥ 40 | ≥ 25 |
| Density (密度) (g/cm³) | 7.93 | 7.98 | 7.80 |
| Corrosion Resistance (耐蚀性) | Excellent (通用耐蚀) | Superior (氯离子耐蚀) | Outstanding (高强度耐蚀) |
| Maximum Service Temperature (最高使用温度) (°C) | 870 | 870 | 315 (pitting limit) |
Corrosion Resistance Characteristics
The austenitic grades (SUS304/SUS316L) exhibit excellent resistance to atmospheric corrosion, organic acids, and aqueous solutions. The addition of molybdenum in SUS316L significantly enhances pitting and crevice corrosion resistance (耐点蚀和缝隙腐蚀), making it suitable for marine environments and chemical processing. Duplex grades offer a combined austenitic-ferritic microstructure (奥氏体-铁素体双相微观结构), delivering approximately twice the yield strength of standard austenitic grades while maintaining superior chloride stress corrosion cracking (Chloride Stress Corrosion Cracking, Cl-SCC) resistance.
Specifications
| Parameter | Specification |
|---|---|
| Outer Diameter (外径) Range | Φ3.0 mm — Φ323.9 mm (custom sizes available) |
| Wall Thickness (壁厚) Range | 0.3 mm — 30.0 mm |
| Coil Length (盘管长度) per Coil | 10 m — 500 m (adjustable per order) |
| Coil Inner Diameter (盘管内径) | Φ200 mm — Φ1000 mm |
| Surface Finish (表面处理) | 2B, BA (Bright Annealed), No.4 Brushed, Mirror (8K), Sandblasted |
| Dimensional Tolerance (尺寸公差) | OD: ±0.05 mm (precision grade); Wall: ±0.03 mm (precision grade) |
| Standard Reference | ASTM A213/A213M, ASTM A269/A269M, GB/T 12771, GB/T 13296, EN 10217, JIS G3459 |
| Heat Treatment (热处理) | Solution Annealed (固溶退火), Stabilized (稳定化处理, for SUS321/SUS347) |
| End Condition (端部状态) | Plain cut, Beveled, Threaded, Flanged (custom) |
| Coil Packaging (盘管包装) | Wooden reel, Steel frame, Moisture-proof wrapping, Export-grade palletization |
| Minimum Order Quantity (最小起订量) | Negotiable based on grade and specification |
Manufacturing Process
Process Flow
- Raw Material Inspection (原材料检验): Incoming stainless steel strip or seamless pipe blanks undergo rigorous spectroscopic analysis (光谱分析) to verify chemical composition compliance with the specified ASTM/EN/GB grade. Mill test certificates (Mill Test Certificate, MTC) are reviewed and cross-referenced.
- Cold Drawing (冷拔工艺): Billet or preformed pipe blanks are cold-drawn through precision tungsten carbide dies (硬质合金模具) to achieve target outer diameter and wall thickness. Multi-pass drawing is employed for tight tolerance requirements, with intermediate annealing cycles to relieve accumulated cold work stress.
- Piercing & Forming (穿孔与成型): For seamless coil tube production, the continuous piercing (连续穿孔) process is utilized, where heated billets are pierced and subsequently reduced through a series of rolling stands to achieve the desired cross-sectional dimensions.
- Solution Annealing (固溶退火): The formed tube is heated to 1050°C–1150°C (depending on grade) and rapidly quenched (水淬) to dissolve carbide precipitates, restoring full austenitic microstructure and maximum corrosion resistance. This critical step ensures the material achieves its specified mechanical and chemical properties.
- Pickling & Passivation (酸洗钝化): The annealed tube undergoes chemical pickling to remove oxide scale (氧化皮), followed by passivation treatment (钝化处理) to form a stable chromium oxide passive film (钝化膜), enhancing long-term corrosion resistance.
- Surface Treatment (表面处理): Depending on specification, the tube receives additional finishing — mechanical polishing, electropolishing (电解抛光), or brushing — to achieve the required surface roughness (Ra values from 0.02 μm to 0.8 μm).
- Coiling (盘绕成型): The finished tube is wound onto precision-mandrel coils (精密卷芯) using controlled tension systems to prevent ovalization (椭圆化) or kinking (扭结). The coiling process is monitored to ensure uniform winding density and prevent inter-coil contact damage.
- Quality Inspection (质量检验): Each coil undergoes comprehensive non-destructive testing (无损检测), including eddy current testing (涡流检测), hydrostatic pressure testing (水压试验), and dimensional verification (尺寸检测) via laser gauging systems.
- Packaging & Dispatch (包装发货): Coils are wrapped in moisture-proof materials, secured on wooden or steel reels, and palletized for export-grade shipment.
Continuous Conveyance System Integration
The coil tube production and deployment system incorporates a series coiled pipeline continuous conveyor (串联盘管道连续输送机) design. The traction steel wire rope movement analysis (牵引钢丝绳运动分析) and drive wheel tooth count determination (驱动轮齿数确定) are critical engineering parameters that govern the smooth, uninterrupted feed of coiled tubing into downstream processing stations. Proper drive wheel configuration ensures:
- Uniform linear feed rate (均匀线速度) without speed fluctuation
- Minimal torsional stress (最小扭转应力) on the tube during unwinding
- Accurate synchronization (精确同步) between the unwinding station and downstream forming/cutting equipment
- Reduced mechanical wear (降低机械磨损) on both the tube surface and conveyor components
Applications
Primary Application Domains
- Automotive Industry (汽车工业): Exhaust system tubing, fuel lines, brake lines, heat exchanger coils, and turbocharger manifolds. The coil form enables automated tube-rolling machines to continuously form complex shapes without manual intervention.
- Food & Beverage Processing (食品饮料加工): Sanitary process piping, brewing equipment, dairy processing lines, and pharmaceutical-grade tubing. BA (Bright Annealed) and electropolished finishes meet FDA and 3-A sanitary standards.
- Chemical & Petrochemical (化工与石油化工): Reactor internals, heat exchanger tubes, distillation columns, and process piping systems. SUS316L and duplex grades handle aggressive chemical media including chlorides, sulfuric acid, and caustic solutions.
- Oil & Gas (石油天然气): Subsea pipeline systems, wellhead equipment, and offshore platform tubing. Duplex and super-duplex grades provide the combination of high strength and chloride SCC resistance required in marine environments.
- Construction & Architecture (建筑与建筑): Structural decorative elements, elevator guide rails, handrail systems, and facade components. The coil form facilitates automated bending and forming of architectural profiles.
- Medical Equipment (医疗设备): Surgical instrument tubing, implant-grade tubing (SUS316L), and diagnostic equipment housings. Precision tolerances and biocompatible surface finishes are critical.
- Energy Sector (能源领域): Solar thermal collector tubes, hydrogen storage vessels, nuclear-grade piping (SUS304/SUS316L), and wind turbine structural components.
- Electronics & Telecommunications (电子与通信): Heat dissipation channels, shielding enclosures, and precision sensor housings.
Advantages of Coil Form (盘管形式优势)
- Continuous Processing: Eliminates the need for butt-welding multiple short lengths, reducing joint-related failure points and improving system integrity.
- Material Efficiency: Minimize cutting waste (减少切割废料) by optimizing coil length to match downstream forming requirements.
- Automation Compatibility: Seamless integration with CNC tube-rolling, laser cutting, and automated bending systems.
- Logistics Optimization: Compact coil packaging reduces shipping volume and weight per linear meter compared to straight-length shipments.
- Flexibility: Single coil can serve multiple product configurations through downstream processing flexibility.
Quality Certifications & Standards Compliance
Management System Certifications
- 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 System (职业健康安全管理体系)
- ISO/TS 22163 — IATF Automotive Quality Management (汽车行业质量管理体系)
Product Certification & Testing
- EN 10204 3.1 — Inspection Certificate (检验证书) with certified material test data
- EN 10204 3.2 — Inspection Certificate (检验证书) with independent third-party inspection
- Mill Test Certificate (MTC): Full chemical analysis (化学成分分析) and mechanical property (力学性能) verification for each heat number (炉号)
- NDT (Non-Destructive Testing, 无损检测): Eddy current (涡流), ultrasonic (超声), magnetic particle (磁粉), and radiographic (射线) testing as required
- Hydrostatic Testing (水压试验): Performed at 1.5× working pressure for minimum 10 seconds per ASTM A213/A269
- Petrochemical & Oil/Gas Certifications: NACE MR0175/ISO 15156 compliance for sour service environments (酸性服役环境)
- Food-Grade Certification: FDA 21 CFR compliance, 3-A Sanitary Standards, EC 1935/2004 (food contact materials)
- Pressure Vessel Certification: PED (Pressure Equipment Directive, 2014/68/EU) compliance, ASME stamp availability for qualified grades
Third-Party Inspection & Verification
All production batches are subject to independent third-party inspection (第三方检验) by accredited bodies including SGS, Bureau Veritas, and TÜV. Chemical composition is verified via optical emission spectrometry (OES, 光发射光谱法), and mechanical properties are confirmed through standardized tensile testing (拉伸试验) per ASTM E8/E8M and hardness testing (硬度试验) per ASTM E92.
Unique Selling Points
1. Precision Engineering Excellence: Wenzhou Jixing Metal Materials Co., Ltd. maintains dimensional tolerances as tight as ±0.03 mm on wall thickness, enabling direct integration into high-precision manufacturing systems without secondary machining.
2. Comprehensive Grade Portfolio: From standard austenitic (SUS304/316L) to super-duplex (25