304/316L Stainless Steel Coil Tube — Ready Stock Supply
Product Overview
The 304/316L Stainless Steel Coil Tube offered by Wenzhou Jixing Metal Materials Co., Ltd. is a high-performance, pre-formed tubular product designed for rapid deployment across industrial, commercial, and engineering applications. Available in a continuously coiled configuration, this product eliminates the need for on-site cutting and straightening, delivering immediate usability upon receipt. With a dedicated ready-stock inventory program covering the most commonly specified grades and dimensions, Wenzhou Jixing ensures delivery within 1 to 3 business days, making it an ideal solution for emergency maintenance, urgent production line replacements, and time-sensitive sample prototyping.
Material & Properties
The coil tubes are manufactured from two premier austenitic stainless steel grades, each selected for its balance of corrosion resistance, mechanical strength, and formability:
- 304 Stainless Steel (UNS S30400): Contains 18% chromium and 8% nickel, providing excellent general corrosion resistance, good weldability, and superior formability. Ideal for non-marine, atmospheric, and food-grade environments.
- 316L Stainless Steel (UNS S31603): A low-carbon variant of 316 with added molybdenum (2–3%), offering enhanced resistance to pitting and crevice corrosion, particularly in chlorinated and acidic environments. The low carbon content minimizes carbide precipitation during welding.
Key Mechanical & Physical Properties
| Property | 304 Stainless Steel | 316L Stainless Steel |
|---|---|---|
| Tensile Strength (min.) | 515 MPa (75 ksi) | 485 MPa (70 ksi) |
| Yield Strength (min.) | 205 MPa (30 ksi) | 170 MPa (25 ksi) |
| Elongation (min.) | 40% | 40% |
| Density | 8.0 g/cm³ | 8.0 g/cm³ |
| Thermal Conductivity (20°C) | 16.3 W/m·K | 14.6 W/m·K |
| Operating Temperature Range | −196°C to +870°C | −196°C to +870°C |
| Corrosion Resistance | Good (general) | Excellent (chloride-rich) |
Specifications
| Parameter | Specification |
|---|---|
| Material Grades | SUS304 / 304L / SUS316L |
| Outer Diameter (OD) | 3 mm – 25 mm (common stock range) |
| Wall Thickness | 0.3 mm – 1.5 mm |
| Coil Length | Standard coils: 50 m – 200 m per spool |
| Surface Finish | Pickled & Passivated (P&P); BA (Bright Annealed) available |
| Tolerance (OD) | ±0.05 mm – ±0.10 mm |
| Tolerance (Wall) | ±10% |
| Standards Complied | ASTM A269 / ASME SA-269 / EN 10216-5 / JIS G3459 |
| Manufacturing Method | Seamless (SMLS) or Precision-Welded (ERW) |
| Delivery Lead Time | 1–3 business days for stocked specifications |
| Minimum Order Quantity | Flexible — sample quantities available |
Manufacturing Process
The coil tube production process at Wenzhou Jixing Metal Materials Co., Ltd. follows rigorous, multi-stage quality control protocols:
- Raw Material Selection: Only certified ingot or mill feedstock from approved suppliers is used, with full traceability from heat number to finished coil.
- Piercing & Extrusion (Seamless): Hot-rolled and pierced billets are cold-drawn and cold-rolled to achieve precise dimensional tolerances and superior surface integrity.
- Precision Welding (ERW alternative): For selected specifications, electric resistance welding produces a high-integrity seam with minimal heat-affected zone.
- Cold Drawing & Sizing: Tubes pass through a series of precision dies to achieve the final OD, wall thickness, and concentricity requirements.
- Heat Treatment: Solution annealing at 1010–1150°C followed by controlled cooling ensures full austenitic microstructure and maximum corrosion resistance.
- Pickling & Passivation: The final surface is cleaned and passivated to remove scale, contaminants, and free iron, establishing a protective chromium oxide layer.
- Coiling & Packaging: Finished tubes are coiled onto steel or plastic spools, wrapped in protective film, and packaged for shipment.
Applications
The versatility of 304/316L stainless steel coil tubes supports a broad spectrum of industrial applications:
- Heat Exchangers & Condensers: Coil tubes are extensively used in shell-and-tube heat exchangers, air conditioning coils, and refrigeration systems where efficient heat transfer and corrosion resistance are critical.
- Automotive & Aerospace: Fuel lines, exhaust components, brake lines, and hydraulic tubing in high-performance vehicles and aircraft.
- Medical & Pharmaceutical: Autoclave tubing, dialysis equipment, surgical instrument tubing, and fluid delivery systems requiring biocompatibility and sterilizability.
- Food & Beverage Processing: Milk processing lines, brewery tubing, sanitary piping, and food-grade transfer systems.
- Chemical & Petrochemical: Process piping, reactor internals, and transfer lines handling aggressive chemicals and corrosive media.
- Emergency Maintenance & Prototyping: The ready-stock inventory is specifically designed to support urgent field repairs, production line stoppages, and R&D sample trials where lead time is the critical constraint.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management systems and holds the following certifications:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001 — Environmental Management System
- NADCAP — Special Process Certification (where applicable)
- ASTM / ASME Compliance — Full material traceability with Mill Test Reports (MTR) and Heat Treatment Records
- Third-Party Inspection — Available upon request (SGS, Bureau Veritas, TÜV)
Unique Selling Points
⚡ Rapid Delivery Guarantee: With a strategically maintained stock of the most commonly specified 304 and 316L coil tube dimensions, Wenzhou Jixing delivers within 1–3 business days — dramatically reducing downtime for emergency repairs and accelerating prototyping timelines.
- Zero Minimum Order for Samples: Flexible MOQ policies accommodate small-quantity sample orders, enabling engineers and procurement teams to validate specifications before committing to bulk purchases.
- Full Traceability: Every coil is traceable to its original heat number, providing complete material provenance for regulated industries.
- Consistent Quality: In-house inspection protocols ensure dimensional accuracy, surface integrity, and mechanical property compliance on every batch.
- Supply Chain Reliability: As a vertically integrated supplier within the Wenzhou stainless steel manufacturing cluster, Wenzhou Jixing leverages deep supply chain relationships to maintain inventory depth and rapid replenishment capability.
Ordering & Support
For immediate inquiries regarding stocked specifications, sample requests, or custom coil tube requirements, Wenzhou Jixing Metal Materials Co., Ltd. provides responsive technical support and quotation services. Customers are encouraged to confirm grade, dimensions, surface finish, and applicable standards prior to placing orders to ensure optimal product selection for their specific application.