316Ti Titanium-Stabilized Stainless Steel Coil Tube
Product Overview
The 316Ti stainless steel coil tube, manufactured by Wenzhou Jixing Metal Materials Co., Ltd, is a premium-grade austenitic alloy tube specifically engineered for demanding high-temperature and chlorinated service environments. As a titanium-stabilized variant of the widely recognized 316L grade, 316Ti delivers superior intergranular corrosion resistance and enhanced high-temperature mechanical strength, making it an ideal choice for applications where conventional 316L tubing may suffer from sensitization and performance degradation. Supplied in continuous coil configuration, this product offers exceptional material utilization, reduced fabrication waste, and streamlined processing for downstream formers and fabricators.
Material & Properties
The 316Ti alloy is a titanium-stabilized austenitic stainless steel derived from the 316/316L family. The addition of titanium (Ti) acts as a powerful carbide scavenger, preferentially forming titanium carbides (TiC) rather than allowing chromium carbides (Cr₂₃C₆) to precipitate at grain boundaries during welding or high-temperature exposure. This metallurgical stabilization eliminates the chromium-depleted zones responsible for intergranular corrosion, preserving the full corrosion resistance of the alloy even after prolonged exposure to elevated temperatures.
Key material advantages include:
- Superior high-temperature strength compared to 316L, maintaining structural integrity in the 450–800°C operating range
- Exceptional resistance to intergranular corrosion after welding or heat exposure, eliminating the need for solution annealing post-fabrication
- Excellent resistance to chlorinated environments, including saltwater, hydrochloric acid solutions, and chloride-rich industrial atmospheres
- Non-magnetic properties in the annealed condition, suitable for electromagnetic compatibility requirements
- Outstanding weldability without risk of sensitization, reducing fabrication complexity and cost
- Good formability and machinability for complex coil tube geometries and custom shapes
Chemical Composition (Typical)
| Element | Carbon (C) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Titanium (Ti) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|---|---|---|---|---|
| Specification | ≤ 0.08% | 16.0 – 18.0% | 10.0 – 14.0% | 2.0 – 3.0% | 5 × C – 0.70% | ≤ 2.0% | ≤ 1.0% | ≤ 0.035% | ≤ 0.030% |
Technical Specifications
| Parameter | Specification |
|---|---|
| Material Grade | 316Ti (UNS S31635 / EN 1.4571 / JIS SUS316Ti) |
| Alloy Classification | Austenitic — Corrosion Resistant (Titanium-Stabilized) |
| Supply Form | Continuous Coil Tube |
| Outer Diameter (OD) | 4 mm – 108 mm (custom sizes available upon request) |
| Wall Thickness | 0.3 mm – 6 mm (tolerance ±0.05 mm) |
| Coil Inner Diameter | 300 mm – 600 mm (configurable) |
| Coil Length | Standard 50 – 500 m per coil (custom lengths available) |
| Surface Finish | Pickled & Passivated (2B), Bright Annealed, or Custom |
| Operating Temperature Range | −196°C to +800°C |
| Key Application Temperature | 450°C – 800°C (chlorine-containing environments) |
| Equivalent Standards | ASTM A213/A269, EN 10216-5, GB/T 14976 |
Manufacturing Process
Wenzhou Jixing Metal Materials Co., Ltd employs a rigorous multi-stage manufacturing process to ensure consistent quality and dimensional accuracy in every coil tube produced:
- Material Selection & Ingot Casting: High-purity raw materials are carefully selected and cast into ingots under controlled atmospheric conditions to minimize contamination and ensure consistent chemistry.
- Hot Rolling & Billet Preparation: Ingot stock is hot-rolled into seamless tube blanks or precision-wound strip, depending on the production route (seamless or welded).
- Pipe/Tube Forming: Blanks are drawn through precision dies or formed via cold-rolled welding and subsequent cold-drawing to achieve exact outer diameter and wall thickness specifications.
- Heat Treatment & Annealing: The formed tube undergoes solution annealing at 1050°C – 1150°C followed by controlled cooling to homogenize the microstructure, dissolve carbides, and restore full ductility and corrosion resistance.
- Pickling & Passivation: The coil is immersed in acid baths to remove surface oxides and impurities, followed by passivation treatment to form a protective chromium oxide film that enhances corrosion resistance.
- Coiling & Packaging: Finished tubes are coiled onto precision mandrels, wrapped in protective film, and packaged in moisture-resistant wrapping with wooden or steel pallets for safe transport.
Applications
The 316Ti stainless steel coil tube is engineered for the most demanding industrial applications where high-temperature strength and chloride corrosion resistance are critical:
- Chemical & Petrochemical Processing: Heat exchangers, reactors, distillation columns, and piping systems handling chlorinated compounds, sulfuric acid, and caustic solutions at elevated temperatures (450–800°C).
- Marine & Offshore Equipment: Seawater cooling systems, desalination plant components, and offshore platform piping exposed to saltwater spray and chlorinated marine atmospheres.
- Power Generation: Boiler tubes, superheater elements, and steam lines in fossil-fuel and nuclear power plants operating in high-temperature, high-pressure environments.
- Food & Pharmaceutical Industry: Hygienic-grade heat exchangers, sanitary piping, and processing equipment requiring resistance to aggressive cleaning chemicals and elevated sterilization temperatures.
- Environmental & Waste Treatment: Flue gas desulfurization systems, scrubber components, and wastewater treatment equipment exposed to acidic, chlorinated, and corrosive media.
- Mechanical Engineering: Spring coils, expansion loops, and flexible connectors in industrial equipment requiring fatigue resistance and high-temperature stability.
Unique Selling Points
Why Choose 316Ti Coil Tube from Wenzhou Jixing Metal Materials Co., Ltd?
- Direct Replacement for 316L in 450–800°C Chloride Environments: Eliminates the need for expensive post-weld heat treatment, reduces fabrication costs, and extends component service life in applications where 316L would suffer from sensitization and intergranular corrosion.
- Superior High-Temperature Mechanical Strength: Maintains yield strength and creep resistance well beyond the capabilities of 316L, ensuring structural reliability in prolonged high-temperature service.
- Cost-Effective Alternative to Nickel Superalloys: Provides a significant portion of the corrosion and temperature performance of 310-series or alloy 625 materials at a fraction of the material cost.
- Seamless Coil Configuration: Maximizes material yield, eliminates weld seams in the tube body, and reduces fabrication time for coil-spring, heat exchanger, and forming applications.
- Customizable Specifications: Available in a wide range of diameters, wall thicknesses, and coil configurations to meet specific project requirements.
Quality Certifications & Testing
Every coil tube produced by Wenzhou Jixing Metal Materials Co., Ltd undergoes comprehensive quality assurance to ensure compliance with international standards:
- Chemical Analysis: Spectrographic verification of alloy composition against ASTM/EN/GB specifications
- Mechanical Testing: Tensile strength, yield strength, and elongation tests conducted per ASTM A370
- Hydrostatic/Pneumatic Testing: 100% pressure testing to verify seam integrity and dimensional accuracy
- Intergranular Corrosion Testing: ASTM A262 Practice E (18% H₂SO₄ + CuSO₄) or Practice A (65°C HCl) to confirm Ti stabilization effectiveness
- Surface Quality Inspection: Visual and magnetic particle inspection for surface defects and imperfections
- Mill Test Certification: Each coil is accompanied by a detailed material test certificate (MTC) conforming to EN 10204 3.1 or 3.2 requirements
- ISO 9001 Quality Management System: Production processes are governed by a certified quality management system ensuring traceability and consistency
Conclusion
The 316Ti titanium-stabilized stainless steel coil tube from Wenzhou Jixing Metal Materials Co., Ltd represents the optimal engineering solution for applications requiring the combined benefits of high-temperature strength, chloride corrosion resistance, and cost-effectiveness. By serving as a proven replacement for 316L in 450–800°C chlorinated environments, this product eliminates sensitization risks, reduces fabrication complexity, and delivers reliable long-term performance in the most demanding industrial conditions. With rigorous quality control, flexible specification options, and adherence to international standards, this coil tube is trusted by chemical processors, power generation facilities, and marine engineers worldwide.