Hastelloy C-276 Coil Tube (Ni-Mo-Cr-W Alloy)
Product Overview
Hastelloy C-276 is a high-performance nickel-molybdenum-chromium-tungsten (Ni-Mo-Cr-W) superalloy coil tube manufactured by Wenzhou Jixing Metal Materials Co., Ltd. Engineered for the most demanding chemical processing environments, this alloy delivers exceptional resistance to wet chlorine, oxidizing acids, and a wide spectrum of corrosive media that defeat conventional austenitic stainless steels and even other nickel-based alloys.
The product is supplied in coil (coiltube) form, offering superior material utilization, reduced fabrication waste, and seamless integration into automated tube-forming, bending, and heat-exchanger manufacturing lines. As Item No. 17 in the company's nickel-base alloy product line, Hastelloy C-276 represents the pinnacle of corrosion-resistant tubular solutions for extreme industrial applications.
Material & Properties
Chemical Composition (wt%)
| Element | Specification Range |
|---|---|
| Nickel (Ni) | Balance (≥55%) |
| Molybdenum (Mo) | 15.0 – 17.0 |
| Chromium (Cr) | 14.5 – 16.5 |
| Tungsten (W) | 3.0 – 4.5 |
| Cobalt (Co) | ≤2.5 |
| Iron (Fe) | ≤4.0 |
| Carbon (C) | ≤0.01 |
| Manganese (Mn) | ≤1.0 |
| Silicon (Si) | ≤0.08 |
| Phosphorus (P) | ≤0.01 |
| Sulfur (S) | ≤0.005 |
Mechanical Properties (Solution Heat-Treated Condition)
| Property | Typical Value |
|---|---|
| Tensile Strength (UTS) | ≥620 MPa (90,000 psi) |
| Yield Strength (0.2% Offset) | ≥275 MPa (40,000 psi) |
| Elongation | ≥40% |
| Density | 8.89 g/cm³ |
| Thermal Conductivity (20°C) | 11.4 W/(m·K) |
| Modulus of Elasticity | 207 GPa (30 × 10⁶ psi) |
| Maximum Service Temperature | 900°C (1650°F) |
Corrosion Resistance Characteristics
- Wet Chlorine (Cl₂): Outstanding resistance across the entire temperature and concentration spectrum, outperforming Hastelloy C-22 and C-200 in hot, concentrated chlorine environments.
- Oxidizing Acids: Superior resistance to sulfuric acid (H₂SO₄) at all concentrations and temperatures, hydrochloric acid (HCl), nitric acid (HNO₃), and mixed acid systems.
- Reducing Acids: Excellent performance in hydrofluoric acid (HF), phosphoric acid (H₃PO₄), and formic acid.
- Caustic Solutions: Immune to concentrated sodium hydroxide (NaOH) and potassium hydroxide (KOH) solutions at elevated temperatures.
- Chloride-Containing Media: High resistance to stress corrosion cracking (SCC) in chloride environments, even at temperatures exceeding 200°C.
Specifications
| Parameter | Specification |
|---|---|
| Product Form | Coil Tube (Coiltube) |
| Alloy Designation | Hastelloy C-276 / UNS N10276 / W.Nr. 2.4610 |
| Standard References | ASTM B435, ASTM B723, EN 10217, ISO 14543 |
| Outer Diameter (OD) | 3.00 mm – 50.80 mm (configurable) |
| Wall Thickness | 0.30 mm – 4.50 mm (configurable) |
| Coil Inner Diameter (ID) | 150 mm – 600 mm |
| Coil Length (per coil) | 100 m – 500 m (customizable) |
| Surface Finish | Mill finish / Polished / Pickled & Passivated |
| Heat Treatment | Solution Annealed (1100–1150°C), followed by water quench |
| Tolerance – OD | ±0.05 mm to ±0.10 mm |
| Tolerance – Wall | ±5% to ±10% |
| Applicable Standards | ASTM B435, ASME B31.3, EN 10217-6 |
Manufacturing Process
- Raw Material Selection: High-purity nickel, molybdenum, chromium, and tungsten master alloys are sourced from certified suppliers and subjected to spectrographic analysis (OES) to ensure compositional compliance.
- Vacuum Arc Remelting (VAR) / Electro-Slag Remelting (ESR): The alloy ingot is produced via double-remelt processes to achieve ultra-low impurity levels (S ≤ 0.005%, P ≤ 0.01%) and eliminate segregation.
- Hot Rolling & Homogenization: The remelted ingot undergoes controlled hot rolling to refine the grain structure and achieve uniform microstructure.
- Hot Extrusion: Billet is extruded at elevated temperatures to form seamless tube blanks with precise dimensional control.
- Piercing & Sizing: The extruded tube is pierced and sized to achieve the required inner and outer diameters with tight tolerances.
- Induction Heating & Coil Winding: The straight tube is induction-heated to enhance ductility and wound onto precision coil reels, ensuring minimal mechanical stress and kinking.
- Solution Heat Treatment: The coil tube is solution-annealed at 1100–1150°C followed by rapid water quenching to dissolve all carbides and precipitates, achieving the single-phase austenitic microstructure essential for maximum corrosion resistance.
- Pickling & Passivation: Surface oxides are removed via controlled acid pickling, followed by passivation treatment to establish a protective chromium oxide film.
- Final Inspection & Certification: Each coil undergoes 100% dimensional verification, hydrostatic testing, and optional eddy-current inspection before packaging and shipment.
Applications
Primary Target Industries
- Extreme Chemical Processing: Reactor linings, heat exchangers, condensers, and piping systems handling concentrated sulfuric acid, mixed acids, and chlorinated organic solvents.
- Waste Acid Regeneration & Recovery: Components in sulfuric acid regeneration plants, acid concentration systems, and spent-acid recovery facilities where simultaneous oxidizing and reducing conditions prevail.
- Pulp & Paper Industry – Bleaching: Chlorine dioxide (ClO₂) generators, hypochlorite solutions, and white liquor systems in kraft pulping and paper bleaching processes.
- Chemical Synthesis: Production of terephthalic acid (PTA), acetic acid, and organic acids involving chlorinated intermediates.
- Pharmaceutical & Biotech: Equipment handling aggressive reagents and cleaning-in-place (CIP) chemicals.
- Environmental & Waste Treatment: Scrubbers, flue gas desulfurization (FGD) systems, and wastewater treatment involving chlorinated compounds.
- Energy Sector: Fuel-cell components, hydrogen production systems, and nuclear waste management equipment.
Typical Operating Environments
| Service Medium | Concentration | Temperature Range | Performance Rating |
|---|---|---|---|
| Sulfuric Acid (H₂SO₄) | 0–100% | Room Temp – 100°C | Excellent (no corrosion) |
| Hydrochloric Acid (HCl) | 0–100% | Room Temp – 60°C | Excellent |
| Wet Chlorine (Cl₂) | All concentrations | Room Temp – 120°C | Excellent |
| Chlorinated Water (200 ppm Cl⁻) | 200 ppm | Room Temp – 150°C | No SCC |
| Hydrofluoric Acid (HF) | 0–100% | Room Temp – 40°C | Good to Excellent |
| Chlorine Dioxide (ClO₂) | 10–30% | Room Temp – 60°C | Excellent |
Quality Certifications & Compliance
- ISO 9001:2015 – Quality Management System certification for consistent product quality and process control.
- EN 10204 3.1/3.2 – Full material traceability certificates with third-party inspection available upon request.
- ASTM B435 – Compliance with the standard specification for Nickel-Molybdenum-Tungsten Alloy (UNS N10276) pipe and tubing.
- ASME Section VIII, Div. 1 – Approved for pressure vessel and piping applications under boiler and pressure vessel code.
- Mill Test Reports (MTR) – Provided with every shipment, including chemical analysis, mechanical test results, and heat treatment records.
- Third-Party Inspection – Available through SGS, Bureau Veritas, or TÜV for independent verification.
- RoHS & REACH Compliance – Free of restricted hazardous substances per European regulatory standards.
Unique Selling Points
"Unmatched resistance to the full spectrum of oxidizing and reducing acids — the definitive alloy for extreme chemical service."
- Superior Wet Chlorine Resistance: Hastelloy C-276 remains the industry benchmark for wet chlorine service, offering corrosion rates below 0.1 mm/year in conditions that rapidly destroy C-22, C-200, and all stainless steels.
- Coil Form Advantage: Supplied as continuous coil tube, enabling automated processing, reduced welding joints, higher system integrity, and 20–30% material savings compared to straight-length supply.
- Wenzhou Jixing Expertise: Over two decades of specialized experience in nickel-base alloy coil tube manufacturing, with in-house vacuum remelting, precision coil winding, and full-spectrum metallurgical testing capabilities.
- Full Traceability: Every coil is traceable from raw material lot through remelting, rolling, and heat treatment, ensuring complete supply chain transparency.
- Custom Configuration: Flexible sizing, surface finish, and coil geometry to meet specific OEM and end-user requirements.
- Global Delivery: Export-oriented logistics with robust packaging suitable for international ocean and air freight.
Technical Advisory Note
Important: Hastelloy C-276 is not recommended for use in environments containing free nitric acid (HNO₃) at concentrations above 10% at temperatures exceeding 40°C, or in the presence of dry chlorine gas. For mixed-acid applications, corrosion rate predictions should be validated against specific concentration and temperature data. Consult Wenzhou Jixing Metal Materials Co., Ltd. technical engineering team for application-specific material selection guidance and corrosion rate estimation.