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| Quantity: | |
|---|---|
(as per ASTM B622)
Grade | Ni | Cr | Mo | Fe | C | Si | Co | Mn | P | S | Cu | Al |
C2000 | Balance | 22.00-24.00 | 15.00-17.00 | 3.0 | ≤0.01 | ≤0.08 | ≤2.00 | ≤0.50 | ≤0.025 | ≤0.01 | 1.30-1.90 | 0.50 |
Hastelloy C2000 seamless pipe and tube (UNS N06200, EN 2.4675) is a next-generation nickel-chromium-molybdenum-copper alloy designed to excel in mixed acid environments where both oxidizing and reducing conditions coexist. Composed of 55% nickel, 23% chromium, 16% molybdenum, 1.6% copper, and trace tungsten/cobalt, it bridges the performance gap between C22 (high Mo) and C276 (balanced Cr/Mo) by offering improved oxidation resistance and copper-enhanced sulfuric acid tolerance. Manufactured via seamless hot-rolling and cold-drawing to ensure uniform wall thickness, it complies with standards like ASTM B622 and ASME SB622.
The alloy’s unique composition provides a synergistic effect: chromium for oxidizing resistance, molybdenum for reducing conditions, and copper for sulfuric acid tolerance, making it a versatile solution for complex chemical processes.
Mixed Acid Resistance: Resists sulfuric acid (up to 70% at 120°C), nitric acid (up to 90% at 150°C), and their mixtures, outperforming C22 in high-nitric acid environments.
Superior Crevice Corrosion Resistance: Passive film stability in chloride-rich crevices (e.g., gasket interfaces) reduces the need for design modifications to prevent localized attack.
High-Temperature Strength: Maintains tensile strength up to 1000°C and resists carburization in industrial furnace atmospheres, though it is primarily optimized for chemical process temperatures (<300°C).
Weldability & Formability: Can be welded with N06200 filler metal using GTAW; cold forming requires intermediate annealing for wall thickness >2 mm to prevent work hardening.
Mining & Hydrometallurgy: Used in leach tanks, solvent extraction lines, and pressure filters handling sulfuric acid-leached copper/nickel ores.
Petrochemical Synthesis: Ideal for reactors and pipelines producing organic acids (e.g., acetic, formic) where both oxidation and reduction occur simultaneously.
Battery Manufacturing: Employed in electrolyte processing systems for lithium-ion batteries, resisting hydrofluoric acid and nickel/cobalt salts.
Pulp & Paper: Suitable for digester equipment and bleaching lines exposed to chlorine dioxide (ClO₂) and sulfur-containing compounds.
Q: How does C2000 differ from C22?
A:C2000 has higher chromium (23% vs. 16% in C22) for better oxidizing resistance and adds copper (1.6%) to improve sulfuric acid tolerance, while C22 excels in pure reducing acids.
Q: Is C2000 suitable for seawater desalination?
A:Yes, it resists pitting in seawater up to 35,000 ppm Cl⁻, but its primary advantage lies in mixed acid environments rather than pure chloride media.
Q: Can C2000 be heat-treated to increase hardness?
A:As a solution-strengthened alloy, it is not age-hardenable; hardness is increased through cold working (max 30% reduction for optimal ductility).
Q: What is the recommended cleaning method after welding?
A:Use nitric-hydrofluoric acid pickling (10% HNO₃ + 1% HF) to remove heat-affected zone oxides and restore passive film integrity.
(as per ASTM B622)
Grade | Tensile Strength ksi(MPa) | Yield Strength ksi(MPa) | Elongation (%) |
C2000 | ≥100(690) | ≥45(310) | ≥45 |
