Hastelloy C276 Nickel Alloy Coil Tube
Product Overview
The Hastelloy C276 Coil Tube is a high-performance, nickel-molybdenum-chromium-tungsten alloy coil tube engineered for the most demanding chemical processing environments. Manufactured by Wenzhou Jixing Metal Materials Co., Ltd, this premium coil tube is specifically designed to withstand extreme corrosion conditions where conventional stainless steels and standard nickel alloys fail. The continuous coil format provides flexibility in downstream forming, cutting, and installation, making it an ideal solution for heat exchangers, chemical reactors, and process piping systems operating under severe corrosive exposure.
Material & Properties
Hastelloy C276 is a solid-solution strengthening nickel-molybdenum-chromium-tungsten alloy, renowned globally for its exceptional resistance to reducing acids, oxidizing acids, and mixed-acid environments. The unique metallurgical composition delivers outstanding performance in wet chlorine, chlorinated hydrocarbons, sulfuric acid, hydrochloric acid, phosphoric acid, and nitric acid at elevated temperatures and concentrations.
- Base Metal: Nickel (Ni) — provides fundamental corrosion resistance and ductility
- Molybdenum (Mo): Enhances resistance to reducing acids and chlorides
- Chromium (Cr): Improves oxidation resistance and passivation capability
- Tungsten (W): Augments strength and resistance to pitting and crevice corrosion
- Carbon (C): Tightly controlled to prevent sensitization and intergranular corrosion
Hastelloy C276 maintains its mechanical integrity and corrosion performance across a wide temperature range, from cryogenic to approximately 400°C, with excellent resistance to stress corrosion cracking (SCC) and pitting in chloride-containing environments.
Specifications
| Parameter | Specification |
|---|---|
| Alloy Designation | Hastelloy C276 (UNS N10276 / W.Nr. 2.4819) |
| Product Form | Coil Tube (Continuous Coil) |
| Chemical Composition (Typical) | Ni: Bal.; Mo: 15.0–17.0%; Cr: 14.5–16.5%; W: 3.0–4.5%; Fe: ≤2.0%; C: ≤0.015%; Mn: ≤1.0%; Si: ≤0.08% |
| Density | 8.89 g/cm³ |
| Tensile Strength (Annealed) | ≥ 550 MPa |
| Yield Strength (0.2% Offset) | ≥ 275 MPa |
| Elongation (Annealed) | ≥ 40% |
| Operating Temperature Range | Cryogenic to ~400°C (752°F) |
| Available Outer Diameters | 6.0 mm – 50.8 mm (custom sizes available) |
| Available Wall Thicknesses | 0.5 mm – 3.0 mm (custom sizes available) |
| Coil Width | Up to 1524 mm (60 inches) |
| Coil Inner Diameter | 305 mm – 762 mm (standard); custom available |
| Surface Finish | Pickled & Passivated / Polished / As-Rolled |
| Hardness (Annealed) | ≤ 187 HB |
Manufacturing Process
The Hastelloy C276 Coil Tube is produced through a rigorously controlled manufacturing process ensuring consistent metallurgical quality and dimensional accuracy:
- Material Selection: Only certified, traceable Hastelloy C276 strip or plate stock from licensed suppliers (e.g., Haynes International, Special Metals) is used as raw material.
- Coil Forming: Precision roll-forming machines shape the alloy strip into the desired tube diameter and wall thickness with tight dimensional tolerances.
- Seam Welding: Continuous TIG (GTAW) or laser welding is employed to produce a high-integrity, corrosion-resistant weld seam with full penetration.
- Weld Heat-Affected Zone Treatment: Post-weld annealing restores the microstructure of the heat-affected zone, eliminating residual stresses and ensuring uniform corrosion resistance throughout the tube.
- Pickling & Passivation: Chemical pickling removes oxide scale and discoloration, followed by passivation to establish a protective chromium oxide film on the surface.
- Non-Destructive Testing (NDT): 100% inline inspection using eddy current testing, ultrasonic testing, and hydrostatic pressure testing ensures weld integrity and absence of defects.
- Final Inspection & Packaging: Dimensional verification, surface inspection, and protective packaging for safe transport and storage.
Applications
Hastelloy C276 Coil Tube is the material of choice for the most aggressive chemical processing applications worldwide:
- Wet Chlorine & Chlorine Dioxide Processing: Unmatched resistance to wet chlorine at elevated temperatures, making it indispensable for chlorine dioxide generators, wet chlorine piping, and related process equipment.
- Waste Acid Regeneration & Recovery: Critical component in spent acid concentration and regeneration systems handling mixed sulfuric, hydrochloric, and nitric acid streams at high concentrations and temperatures.
- Pulp & Paper Bleaching: Essential for chlorine dioxide generators, bleach plant equipment, and evaporators in the kraft pulping and bleaching process.
- Chemical Processing: Reactors, heat exchangers, distillation columns, and piping systems handling reducing and oxidizing acids, including sulfuric acid, hydrochloric acid, and phosphoric acid.
- Petrochemical & Refining: Crude oil distillation, sour water handling, and hydrodesulfurization unit components exposed to chlorides and hydrogen sulfide.
- Pharmaceutical & Food Processing: Equipment requiring extreme purity and corrosion resistance in aggressive cleaning and processing environments.
- Environmental & Waste Treatment: Flue gas desulfurization systems, wastewater treatment, and hazardous waste incineration applications.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management system ensuring every Hastelloy C276 Coil Tube meets international standards:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001 — Environmental Management System
- EN 10204 3.1 — Third-party material certification with full traceability
- ASTM B626 / ASTM B626M — Specification for seamless and welded nickel-iron-chromium-molybdenum-tungsten alloy (C276) pipe and tube
- ASTM B415 — Specification for sheet and plate of nickel-iron-chromium-molybdenum alloys
- ASME BPV Code — Compliance for pressure vessel applications (where applicable)
- Mill Test Reports (MTR) — 100% material traceability with full chemical and mechanical test data
- Third-Party Inspection — Available upon request (e.g., SGS, Bureau Veritas, TÜV)
Unique Selling Points
- Superior Corrosion Resistance: Hastelloy C276 offers the broadest corrosion resistance envelope of any nickel-based alloy, performing where 316L, 316LN, and even Hastelloy B alloys cannot survive.
- Wet Chlorine Resistance: The only alloy suitable for continuous service in wet chlorine at temperatures up to 60°C, a critical differentiator in chlorine and chlor-alkali industries.
- Continuous Coil Format: Reduces material waste, eliminates field welding joints, and enables seamless integration into heat exchanger coil manufacturing and complex process piping layouts.
- Full Traceability: Every coil tube is accompanied by certified mill test reports with complete chemical analysis, mechanical test data, and heat number traceability.
- Custom Fabrication Capability: Wenzhou Jixing Metal Materials offers custom diameters, wall thicknesses, coil widths, and surface finishes to meet specific project requirements.
- Proven Global Track Record: Hastelloy C276 is the industry-standard alloy specified by major chemical, pulp & paper, and petrochemical engineers worldwide for the most severe service conditions.
Conclusion
The Hastelloy C276 Coil Tube from Wenzhou Jixing Metal Materials Co., Ltd represents the pinnacle of corrosion-resistant tubing solutions for extreme chemical processing applications. With its unmatched resistance to wet chlorine, strong oxidizing acids, and reducing environments, combined with the flexibility and efficiency of the continuous coil format, this product delivers superior performance, extended service life, and reduced lifecycle costs for the world's most demanding industrial processes.