Stainless Steel Coil Tube — One-Step Uncoiling, Traction, Straightening & Interruption Process Equipment
Product Code: No. 1622 | Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd. | Category: Process Engineering & Equipment Documentation
1. Product Overview
The stainless steel coil tube (盘管) is a continuously wound tubular product manufactured from austenitic, ferritic, or duplex stainless steel wire rods. The coil tube is produced using a proprietary one-step process equipment system that integrates four critical operations — uncoiling (松圈), traction (牵引), straightening (矫直), and interruption (中断) — into a single synchronized production line. This integrated approach eliminates the need for intermediate storage buffers between stages, significantly reducing floor space requirements, labor costs, and material handling losses.
Wenzhou Jixing Metal Materials Co., Ltd. specializes in the design, manufacturing, and commissioning of this one-step coil tube processing line, which delivers high throughput rates while maintaining tight dimensional tolerances and superior surface finish quality on stainless steel tubing products.
2. Material & Properties
The coil tube products processed through this equipment system are compatible with the following stainless steel grades:
- Austenitic Grades: AISI 304 (UNS S30400), AISI 304L (UNS S30403), AISI 316 (UNS S31600), AISI 316L (UNS S31603), AISI 321 (UNS S32100), AISI 316Ti (UNS S31609)
- Ferritic Grades: AISI 430 (UNS S43000), AISI 439 (UNS S43900), AISI 444 (UNS S44400)
- Duplex Grades: UNS S31803 (2205), UNS S32205, UNS S32750 (2507 Super Duplex)
- Custom Alloy Grades: Available upon request for specialized chemical compositions
Key Mechanical Properties (Typical for AISI 304 Coil Tube)
| Property | Specification | Standard Reference |
|---|---|---|
| Tensile Strength (抗拉强度) | ≥ 515 MPa (74.7 ksi) | ASTM A213 / ASTM B366 |
| Yield Strength (屈服强度) | ≥ 205 MPa (29.7 ksi) | ASTM A213 |
| Elongation (延伸率) | ≥ 40% (over 50 mm gauge length) | ASTM A213 |
| Hardness (硬度) | ≤ 230 HB (Annealed Condition) | ASTM A923 |
| Corrosion Resistance (耐蚀性) | Equivalent to 304 sheet in most atmospheric and chemical environments | ASTM G48 / ASTM G59 |
| Maximum Service Temperature (最高使用温度) | 870 °C (1600 °F) in oxidizing atmosphere | ASTM A213 |
| Minimum Service Temperature (最低使用温度) | −196 °C (−321 °F) with no ductility loss | ASME BPVC Section VIII |
Chemical Composition (Typical — AISI 304)
| Element | Specification (%) | Element | Specification (%) |
|---|---|---|---|
| Carbon (C) | ≤ 0.08 | Chromium (Cr) | 18.0 – 20.0 |
| Manganese (Mn) | ≤ 2.0 | Nickel (Ni) | 8.0 – 10.5 |
| Silicon (Si) | ≤ 1.0 | Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | Iron (Fe) | Balance |
3. Specifications
Coil Tube Product Dimensions
| Parameter | Specification / Range | Standard Reference |
|---|---|---|
| Outer Diameter (OD) (外径) | Φ 3.0 mm – Φ 50.8 mm (1/8" – 2") | ASTM B366 / GB/T 14976 |
| Wall Thickness (壁厚) | 0.3 mm – 3.0 mm | ASTM B366 |
| OD Tolerance (外径公差) | ± 0.05 mm (Precision grade); ± 0.1 mm (Standard grade) | ASTM B366 |
| Wall Thickness Tolerance (壁厚公差) | ± 10% of nominal | ASTM B366 |
| Coil Inner Diameter (盘管内径) | Φ 150 mm – Φ 300 mm | Manufacturer specification |
| Coil Weight (盘管重量) | 50 kg – 500 kg per coil | Manufacturer specification |
| Surface Finish (表面光洁度) | Mirror polished (Ra ≤ 0.1 μm); Electropolished (Ra ≤ 0.4 μm); Pickled & passivated (Ra ≤ 1.6 μm) | ASTM A967 / GB/T 8898 |
| Delivery Condition (交货状态) | Annealed & Pickled (A&P); Solution annealed; Cold-worked | ASTM A213 |
One-Step Process Equipment Specifications
| Parameter | Specification |
|---|---|
| Line Throughput (生产线产能) | 150 – 600 meters per hour (configurable) |
| Line Length (线体长度) | 12 – 25 meters (compact configuration) |
| Motor Power (电机功率) | 15 kW – 45 kW (main traction motor) |
| Control System (控制系统) | PLC-based (Siemens S7-1500 / Mitsubishi FX5U) with HMI touchscreen |
| Speed Control (调速方式) | VFD (Variable Frequency Drive) with ± 0.5% speed stability |
| Straightening Accuracy (矫直精度) | ≤ 0.1 mm/m straightness deviation |
| Max Continuous Tube Length (最大连续管材长度) | Up to 100,000 meters (continuous operation) |
| Power Supply (电源) | 380V / 3-phase / 50 Hz (customizable for 220V / 60 Hz) |
| Equipment Weight (设备重量) | 3,500 – 8,000 kg (depending on configuration) |
4. Manufacturing Process
The one-step process equipment integrates four fundamental operations into a single continuous line, representing a significant advancement over traditional multi-stage processing methods that require separate equipment and intermediate storage.
4.1 Stage 1 — Uncoiling (松圈 / Loose-Coil Payoff)
The incoming stainless steel coil tube is loaded onto a motorized uncoiling reel. The loose-coil (松圈) mechanism allows the coil to be progressively unwound while maintaining a controlled, gradually expanding loop profile. This prevents excessive bending stresses on the tubing and eliminates the risk of coil collapse or springback. The uncoiling unit features:
- Hydraulic or pneumatic coil expansion mechanism with adjustable coil diameter range
- Anti-slip coil grippers with quick-release clamping for rapid coil changeover
- Encoder-based loop length monitoring for precise material feed control
- Automatic coil end detection and line shutdown safety interlock
4.2 Stage 2 — Traction (牵引 / Continuous Traction)
The traction system provides continuous, uniform pulling force through the entire processing line. The main traction motor, driven by a Variable Frequency Drive (VFD), ensures precise speed control from 5 m/min to 600 m/min. Key features include:
- Multi-stand traction rollers with precision-ground V-groove or flat surfaces
- Roller surface material: Hardened alloy steel (HRC 58–62) or ceramic-coated for enhanced surface protection
- Hydraulic roller pressure adjustment for accommodating different tube diameters and wall thicknesses
- Tension monitoring sensors for real-time force feedback and closed-loop speed control
- Emergency brake and magnetic particle brake (磁粉制动器) for instant line stop
4.3 Stage 3 — Straightening (矫直 / Straightening)
The straightening unit corrects any residual curvature or ovality imparted during the coiling process. The equipment employs a multi-roller straightening mechanism:
- 3-to-4-roller straightening configuration with adjustable roller spacing
- Roller profile: Hardened alloy steel (HRC 60–62) with mirror-polished working surfaces to prevent surface marring
- Hydraulic roller positioning with ± 0.01 mm repeatability
- Post-straightening straightness: ≤ 0.1 mm/m (measured per ASTM A213 / EN 10217-7)
- Optional mandrel straightening for thin-wall tubes (wall thickness ≤ 1.0 mm) to prevent wall thinning
4.4 Stage 4 — Interruption (中断 / Interruption & Cut-off)
The interruption station manages the transition between coils and controls the final cut length of the processed tubing. This critical station ensures:
- Coil-to-coil transition: During the end-of-coil phase, the interruption mechanism maintains line tension while allowing the next coil to be pre-loaded and spliced or butt-welded, achieving near-zero production downtime
- Length control cutting: Integrated flying shear or rotary cut-off saw with encoder-based length measurement accuracy of ± 1 mm
- End finishing: Optional deburring, chamfering, or end-polishing stations downstream of the cut-off point
- Coil changeover cycle time: ≤ 5 minutes (compared to 15–30 minutes in conventional multi-stage systems)
4.5 Process Flow Diagram
Raw Coil Tube → Uncoiling Reel (松圈) → Loop Accumulator → Traction Rollers (牵引) → Straightening Unit (矫直) → Interruption & Cut-off Station (中断) → Finished Product
5. Applications
Stainless steel coil tubes processed through this one-step equipment system find extensive application across multiple industries:
5.1 Heat Exchanger & Boiler Industry
- Tubes for shell-and-tube heat exchangers (管壳式换热器)
- Boiler water tubes and steam superheater tubes
- Condensers and evaporators in HVAC (Heating, Ventilation, and Air Conditioning) systems
5.2 Chemical & Petrochemical Processing
- Process piping for acid, alkali, and solvent handling systems
- Reactor internals and heat transfer coils
- Corrosion-resistant tubing in refinery environments
5.3 Food & Beverage Industry
- Sanitary-grade tubing for dairy, beverage, and pharmaceutical processing lines
- Steam sterilization lines and CIP (Clean-in-Place) systems
- Food-grade tubing meeting FDA 21 CFR Part 178 and 3-A Sanitary Standards
5.4 Automotive & Aerospace
- Exhaust system components and catalytic converter substrates
- Hydraulic and pneumatic tubing for aerospace actuation systems
- Fuel system lines and turbocharger coolant circuits
5.5 Construction & Architecture
- Decorative railings, handrails, and structural tubing
- Building facade support systems
- Fire sprinkler systems and