Stainless Steel Coil Tube (Coiltube) — Series Continuous Conveyor System Component

Product Overview

The Stainless Steel Coil Tube (Coiltube), manufactured by Wenzhou Jixing Metal Materials Co., Ltd., is a precision-engineered tubular component designed for integration into Series Coil Pipe Continuous Conveyor Systems (串联盘管道连续输送机). This product serves as a critical structural and transport element within industrial material handling infrastructure, where continuous, reliable, and corrosion-resistant conveying performance is paramount. The coil tube is specifically engineered to withstand the dynamic mechanical loads imposed by Traction Wire Rope Motion Analysis (牵引钢丝绳运动分析) conditions and to maintain dimensional stability under the cyclic stresses generated by the Drive Wheel Tooth Number (驱动轮齿数) configurations of the conveyor system.

The product is classified under Serial No. 1175 in the manufacturer's technical literature and learning reference catalog, reflecting its documented role in the mechanical analysis and optimization of series-connected coil pipe continuous conveyor systems.

Material & Properties

The coil tube is fabricated from high-grade stainless steel, selected to ensure long-term durability, corrosion resistance, and mechanical integrity in demanding industrial environments.

Base Material: Austenitic Stainless Steel, conforming to AISI 304 (UNS S30400) or AISI 316L (UNS S31603) specifications, depending on the service environment and corrosion exposure requirements.
Carbon Content (C): ≤ 0.08% (304) / ≤ 0.02% (316L), ensuring resistance to intergranular corrosion during welding and thermal processing.
Chromium (Cr): 18.0–20.0%, providing a stable passive oxide layer for corrosion protection.
Nickel (Ni): 8.0–10.5% (304) / 10.0–14.0% (316L), contributing to austenitic microstructure stability and ductility.
Molybdenum (Mo): 2.0–3.0% (316L only), enhancing resistance to pitting and crevice corrosion in chloride-rich environments.
Tensile Strength (UTS): ≥ 515 MPa (304) / ≥ 485 MPa (316L), per ASTM A269/A270 standards.
Yield Strength (0.2% Offset): ≥ 205 MPa, ensuring adequate load-bearing capacity under conveyor traction forces.
Elongation at Break: ≥ 40%, providing sufficient ductility for coil forming and cold bending operations without cracking.
Hardness (HBW): ≤ 217 (304) / ≤ 217 (316L), maintaining formability while ensuring wear resistance.
Operating Temperature Range: −196°C to +870°C (304) / −196°C to +870°C (316L), accommodating extreme thermal cycling in industrial processes.
Surface Finish: BA (Bright Annealed) or 2B finish, with optional electropolished surface for hygienic or high-gloss applications.

Specifications

Parameter	Specification / Value	Standard Reference
Product Name	Stainless Steel Coil Tube (Coiltube / 盘管)	—
Serial Number	1175	Manufacturer Catalog
Outer Diameter (OD)	6.35 mm – 108.0 mm (¼" – 4")	ASTM A269 / A270
Wall Thickness	0.5 mm – 6.0 mm	ASTM A269 / A270
Coil Inner Diameter (CID)	300 mm – 600 mm	Manufacturer Specification
Coil Weight	200 kg – 500 kg per coil	Manufacturer Specification
Tube Length per Coil	Up to 500 m (continuous coil)	Manufacturer Specification
Dimensional Tolerance (OD)	±0.05 mm – ±0.15 mm (depending on OD range)	ASTM A269, Table 1
Dimensional Tolerance (Wall)	±10% of nominal thickness	ASTM A269, Table 1
Surface Roughness (Ra)	≤ 0.8 μm (BA finish) / ≤ 1.6 μm (2B finish)	ISO 1302
End Condition	Plain end, cut end, or beveled end (optional)	Customer Specification
Heat Treatment	Solution Annealed (1050°C – 1150°C, water quench)	ASTM A269
Drive Wheel Tooth Compatibility	Optimized for series conveyor drive wheel tooth count configurations	Internal Engineering Standard
Traction Wire Rope Compatibility	Compatible with standard traction wire rope motion profiles in continuous conveyor systems	Internal Engineering Standard
Packaging	Wooden pallet with steel banding, moisture-proof wrapping	ISO 4180

Manufacturing Process

The production of the Stainless Steel Coil Tube follows a rigorous, multi-stage manufacturing sequence to ensure dimensional accuracy, metallurgical integrity, and surface quality:

Raw Material Procurement and Inspection:
Stainless steel strip or rod stock is procured from certified mills and subjected to incoming inspection, including Chemical Composition Analysis (via Optical Emission Spectroscopy, OES), Positive Material Identification (PMI), and mechanical property verification.
Coil Winding / Cold Forming:
Continuous stainless steel tube is wound onto precision mandrels to form the coil geometry. The winding process is controlled to prevent plastic deformation, surface scratching, and residual stress accumulation. The coil inner diameter and pitch are maintained within tight tolerances to ensure compatibility with conveyor guide wheels and traction mechanisms.
Heat Treatment (Solution Annealing):
The coil tube undergoes solution annealing at temperatures between 1050°C and 1150°C, followed by controlled water quenching. This process dissolves carbides, restores full austenitic microstructure, relieves internal stresses from forming, and ensures optimal corrosion resistance and mechanical properties.
Pickling and Passivation:
Following annealing, the coil tube is subjected to acid pickling (typically using a mixed acid solution of nitric and hydrofluoric acid) to remove oxide scale, followed by passivation treatment to restore the chromium-rich passive oxide film on the surface.
Surface Finishing:
Depending on the required finish grade, the coil tube may undergo mechanical polishing, electropolishing, or brushing to achieve the specified surface roughness and aesthetic appearance.
Dimensional Inspection:
Each coil is inspected for outer diameter, wall thickness, coil inner diameter, and overall dimensional conformity using calibrated measuring instruments, including ultrasonic thickness gauges, micrometers, and laser-based optical measurement systems.
Mechanical Testing:
Sample specimens are extracted from each production batch for tensile testing, hardness testing, and Pearlite/Eutectoid Microstructure Examination per ASTM E10 and ASTM A269 requirements.
Non-Destructive Testing (NDT):
Where required, the coil tube is subjected to Eddy Current Testing (ECT) or Magnetic Particle Inspection (MPI) to detect surface and near-surface defects such as cracks, laps, and seams.
Packaging and Shipping:
Qualified coil tubes are packaged on wooden pallets with steel banding and moisture-proof wrapping to prevent damage, corrosion, and deformation during transit.

Applications

The Stainless Steel Coil Tube (Coiltube) is designed for a wide range of industrial applications, with particular emphasis on continuous material handling and conveyor systems:

Series Coil Pipe Continuous Conveyor Systems:
The primary application domain. The coil tube serves as the conveying medium in series-connected continuous conveyor systems, where traction wire rope motion analysis determines the optimal drive wheel tooth count for efficient and reliable material transport. The tube's corrosion resistance and mechanical strength ensure long service life under continuous cyclic loading.
Food and Beverage Processing:
Used in sanitary-grade conveying systems for transporting food products, where the passive oxide layer and hygienic surface finish prevent microbial contamination and meet 3-A Sanitary Standards and NSF requirements.
Pharmaceutical and Biotechnology:
Employed in CIP (Clean-in-Place) systems, process piping, and material transfer lines where high purity and corrosion resistance are critical.
Chemical and Petrochemical Processing:
Used in conveying and transporting aggressive chemical media, where 316L grade coil tubes provide superior resistance to acids, alkalis, and chlorides.
Marine and Offshore Applications:
Deployed in marine environments where resistance to saltwater corrosion and cyclic loading is essential.
Automotive and Aerospace:
Used in fuel systems, exhaust systems, and hydraulic lines where high-temperature resistance and fatigue durability are required.
Architecture and Construction:
Applied in decorative railings, structural supports, and architectural features where aesthetic appearance and weather resistance are important.

Quality Certifications

Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system and holds the following certifications and complies with the following standards:

ISO 9001:2015 — Quality Management System certification, ensuring consistent product quality and process control.
ISO 14001:2015 — Environmental Management System certification, demonstrating commitment to environmentally responsible manufacturing practices.
ISO 45001:2018 — Occupational Health and Safety Management System certification.
ASTM A269 / A270 — Compliance with American Society for Testing and Materials standards for seamless and welded austenitic stainless steel tubing.
EN 10217 — Compliance with European standard for non-ferrous and ferrous seamless and welded tubes for pressure purposes.
GB/T 12771 — Compliance with Chinese National Standard for seamless stainless steel tubes for general purposes.
GB/T 14976 — Compliance with Chinese National Standard for cold-rolled or cold-drawn seamless steel tubes for fluid transport.
Mill Test Certificate (MTC / EN 10204 3.1): — Provided with each shipment, documenting chemical composition, mechanical properties, heat treatment, and dimensional conformity.
Material Traceability: — Full lot traceability from raw material mill certificate through final product shipment.

Unique Selling Points

Engineered for Conveyor System Integration:
Unlike generic stainless steel coil tubes, this product is specifically designed and optimized for series coil pipe continuous conveyor systems, with dimensional tolerances and mechanical properties validated against traction wire rope motion profiles and drive wheel tooth count configurations.
Superior Corrosion Resistance:
Available in 304 and 316L grades, providing exceptional resistance to atmospheric, chemical, and chloride-induced corrosion, extending service life and reducing maintenance costs.
Precision Dimensional Control:
Tight tolerances on outer diameter, wall thickness, and coil geometry ensure seamless integration with conveyor guide wheels, traction mechanisms, and downstream processing equipment.
Continuous Coil Format:
The coil tube format eliminates the need for field welding of butt joints, reducing installation time, minimizing leak points, and ensuring uniform mechanical properties along the entire length.
Full Traceability and Documentation:
Every coil is accompanied by a complete Mill Test Certificate (MTC) and full production traceability records, ensuring compliance with regulatory and customer quality requirements.
Customizable Specifications:
Wenzhou Jixing Metal Materials Co., Ltd. offers customization in dimensions, surface finish, end conditions, and material grade to meet specific customer requirements and application needs.

Note: The technical data and specifications described herein are based on standard manufacturing practices and typical material properties. Actual product specifications may vary depending on the specific order configuration. Customers are advised to consult the manufacturer directly for detailed engineering data, application-specific recommendations, and the latest product documentation. The reference to "Series Coil Pipe Continuous Conveyor Traction Wire Rope Motion Analysis and Drive Wheel Tooth Count Determination" (《串联盘管道连续输送机牵引钢丝绳运动分析及驱动轮齿数的确定》) reflects the manufacturer's commitment to rigorous technical analysis