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Home > Products > Hastelloy bar > Hastelloy C-2000/UNS N06200/W. Nr. 2.4675/Alloy C-2000 bar
Hastelloy C-2000 bar, designated as UNS N06200, material number W.Nr. 2.4675, and commonly referred to as Alloy C-2000, is a versatile nickel-chromium…
Hastelloy C-2000 bar, designated as UNS N06200, material number W.Nr. 2.4675, and commonly referred to as Alloy C-2000, is a versatile nickel-chromium-molybdenum-copper alloy engineered to provide the widest possible range of corrosion resistance, excelling in both oxidizing and reducing chemical environments. This bar stock form represents a significant advancement in corrosion-resistant alloys, offering a balanced composition that allows it to handle mixed acids, chlorides, and other aggressive media more effectively than many predecessors. It is a premier material for machining critical components like pump shafts, valve trim, and agitators in demanding chemical processing, pharmaceutical, and pollution control applications.
Hastelloy C-2000 was developed to bridge the performance gap between alloys optimized for either oxidizing or reducing conditions. By incorporating a significant amount of chromium for oxidizing resistance, molybdenum for reducing resistance, and a deliberate addition of copper to enhance resistance to sulfuric acid, it achieves an unparalleled breadth of corrosion resistance. The bar stock is ideal for components exposed to complex or fluctuating process chemistries where a single, reliable material is required to handle a variety of corrosive species.
The exceptional and balanced corrosion resistance of Hastelloy C-2000 bar stems from its uniquely optimized chemistry. Supplied by Shanghai NC Metal Materials Co., Ltd., the bar stock is produced to meet precise specifications that ensure its top-tier performance.
| Element | Percentage (%) – Typical Range | Primary Function in the Alloy |
|---|---|---|
| Nickel (Ni) | Balance (≥ 59.0) | Base element; provides the austenitic matrix and fundamental resistance to stress corrosion cracking and a wide range of environments. |
| Chromium (Cr) | 22.0 – 24.0 | Provides excellent resistance to oxidizing media such as nitric acid, ferric ions, cupric chloride, and environments containing dissolved oxygen. |
| Molybdenum (Mo) | 15.0 – 17.0 | Confers outstanding resistance to reducing acids (e.g., hydrochloric, sulfuric) and is critical for preventing pitting and crevice corrosion in chloride solutions. |
| Copper (Cu) | 1.3 – 1.9 | Strategic addition that significantly improves resistance to sulfuric acid and other reducing acids, particularly at intermediate concentrations. |
| Tungsten (W) | 0.5 max | Residual element; some versions may contain a small controlled amount. |
| Iron (Fe) | 3.0 max | Residual element; kept low to optimize corrosion resistance. |
| Cobalt (Co) | 2.0 max | Residual/controlled element. |
| Carbon (C) | 0.01 max | Kept extremely low to prevent carbide precipitation and sensitization during welding, ensuring optimal corrosion resistance in fabricated structures. |
| Manganese (Mn) | 0.50 max | Residual element, deoxidizer. |
| Silicon (Si) | 0.08 max | Kept very low to prevent the formation of detrimental phases and maintain thermal stability and fabricability. |
| Aluminum (Al) | 0.50 max | Residual element. |
| Titanium (Ti) | 0.10 max | Residual element. |
Hastelloy C-2000 bar offers a robust combination of high strength and excellent ductility, suitable for demanding mechanical applications in aggressive chemical plants. It is supplied in the solution-annealed condition.
| Mechanical Property | Typical Value at Room Temperature (Annealed) | Key Characteristic |
|---|---|---|
| Tensile Strength | ≥ 690 MPa (100 ksi) | High strength for pressure vessel components and rotating equipment. |
| Yield Strength (0.2% Offset) | ≥ 310 MPa (45 ksi) | – |
| Elongation in 2 inches (50mm) | ≥ 45% | Excellent ductility, ensuring good formability and toughness for fabricated components. |
| Hardness (Rockwell B) | 85 – 100 HRB | – |
The physical properties of Alloy C-2000 bar are consistent with other nickel-chromium-molybdenum alloys and are important for equipment design.
| Physical Property | Value at Room Temperature (20°C / 68°F) | Notes / Condition |
|---|---|---|
| Density | 8.50 g/cm³ (0.307 lb/in³) | – |
| Melting Range | 1350 – 1400°C (2460 – 2550°F) | – |
| Specific Heat | ≈ 410 J/kg·°C (0.098 BTU/lb·°F) | At 100°C |
| Thermal Conductivity | 10.5 W/m·K (72.8 BTU·in/hr·ft²·°F) | At 100°C |
| Mean Coefficient of Thermal Expansion | 11.5 μm/m·°C (6.4 μin/in·°F) | 20-100°C (68-212°F) |
| Electrical Resistivity | 1.25 μΩ·m (49.2 μΩ·in) | At 20°C |
| Modulus of Elasticity (Tensile) | 206 GPa (29.9 x 10^6 psi) | At 20°C |
Shanghai NC Metal Materials Co., Ltd. supplies Hastelloy C-2000 bar in various forms to meet the needs of the chemical process industry, adhering to both international and proprietary standards.
| Product Form | Standard Size Range | Key Standard Specifications | Common Supply Conditions |
|---|---|---|---|
| Round Bar (Hot Rolled/Forged) | 10mm (0.4″) to 300mm (12″) Diameter | ASTM B574 (UNS N06200), ASME SB-574, DIN 17744 (W.Nr. 2.4675), Proprietary Haynes® specification | Solution Annealed |
| Hexagonal Bar | 10mm to 80mm Across Flats | ASTM B574, DIN 17744 | Solution Annealed |
| Square Bar | 10mm to 80mm Width | ASTM B574 | Solution Annealed |
| Cold Finished Bar (Drawn/Ground) | 5mm to 120mm Diameter | ASTM B574 (cold drawn) | Solution Annealed, Cold Drawn & Stress-Relieved |
| Forging Billet | 150mm to 400mm Diameter | ASTM B564 (Forgings), Customer forging specs | As-Forged, Solution Annealed |
Machined components from Hastelloy C-2000 bar are employed in the most challenging corrosive services: Chemical Processing: Reactors, columns, heat exchangers, pumps, and valves handling mixed acids (e.g., sulfuric/nitric), hydrochloric acid, chlorine-containing streams, and acidic chlorides. Flue Gas Desulfurization (FGD): Critical components in scrubbers, fans, and ducting where chloride-laden acidic conditions are prevalent. Pharmaceutical and Fine Chemical Synthesis: Equipment requiring resistance to a wide array of aggressive reagents and cleaning agents. Pulp and Paper Industry: Components in bleach plants and chemical recovery systems.
Hastelloy C-2000 is renowned for its truly versatile corrosion resistance. It performs exceptionally well in both oxidizing and reducing environments. It offers superior resistance to sulfuric acid across a wide concentration and temperature range, significantly enhanced by its copper content. It handles hydrochloric acid, hydrofluoric acid (especially when aerated), phosphoric acid, and organic acids. Its high chromium and molybdenum levels give it outstanding resistance to pitting and crevice corrosion in chloride solutions, often outperforming other C-type alloys. It also resists stress corrosion cracking in chloride-bearing environments.
Hastelloy C-2000 bar is machinable using techniques standard for high-strength, work-hardening nickel alloys. Best practices include: using rigid machine tools with ample power; sharp carbide or ceramic cutting tools with positive rake angles; moderate cutting speeds; consistent, positive feed rates to work beneath the hardened surface; and high-pressure coolant for heat dissipation and chip evacuation. Its work-hardening tendency requires avoiding tool dwelling.
Alloy C-2000 exhibits excellent weldability, comparable to or better than other C-type alloys. It can be welded using Gas Tungsten Arc Welding (GTAW/TIG), Shielded Metal Arc Welding (SMAW/Stick), and Gas Metal Arc Welding (GMAW/MIG). Matching filler metals (e.g., ERNiCrMo-17) are typically used. Its extremely low carbon content and balanced composition make it highly resistant to sensitization and the formation of harmful secondary phases in the weld heat-affected zone. Post-weld heat treatment is not generally required for corrosion resistance in most applications.
The price of Hastelloy C-2000 bar from Shanghai NC Metal Materials Co., Ltd. is influenced by its high nickel, chromium, and molybdenum content, the strategic copper addition, and the premium associated with its top-tier, versatile corrosion performance.
| Pricing Factor | Impact on Reference Price | Procurement Guidance |
|---|---|---|
| High Alloying Element Content | The combined cost of high nickel, chromium (~23%), and molybdenum (~16%) is significant. The deliberate copper addition also contributes to the cost structure. | This is a premium alloy where cost is justified by its unparalleled versatility, potentially reducing inventory needs by replacing several other specialized alloys. |
| Ultra-Low Carbon and Silicon | The requirement for carbon ≤ 0.01% and silicon ≤ 0.08% necessitates advanced melting and refining techniques, adding to manufacturing complexity and cost. | Verify these ultra-low levels on the mill certificate, as they are crucial for the alloy’s weldability and resistance to intergranular attack. |
| Form and Size | Large diameter forging stock and small diameter precision ground bar are more expensive per kilogram than standard hot-rolled round bar. | For most shaft and valve component machining, standard hot-rolled round bar offers the best balance of availability and cost. |
| Certification and Testing | Requirements for extensive corrosion test data (e.g., corrosion rates in specific acid mixtures), full traceability, or special NDE can add considerable cost. | Specify the exact testing package required. For many applications, a standard mill test report meeting ASTM B574 is adequate. Its broad resistance often reduces the need for extensive project-specific testing. |
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