UNS N06022 nickel alloy seamless pipe for reactor vessel
UNS N06022 (Alloy 22 or Hastelloy C22) seamless tubing is an ideal material for reactor vessels due to its excellent corrosion resistance, particularly in oxidizing and reducing environments, including those with chlorides, nitric acid, or sulfuric acid. Its high chromium, molybdenum, and tungsten content provides resistance to general corrosion, pitting, and crevice corrosion, making it suitable for demanding chemical processing, nuclear fuel reprocessing, and high-temperature applications.
What is the difference between C22 and C276 alloys?
When comparing Hastelloy C22 and Hastelloy C276, the first thing to note is that C22 offers superior corrosion resistance, particularly against pitting and crevice corrosion. This is primarily due to the higher chromium content in Hastelloy C22 than in Hastelloy C276.
Hastelloy C22 Pipe Specification
| Specifications | ASTM B 167 ASME SB 167 / ASTM B 829 ASME SB 829 / ASTM B 517 ASME SB 517 | |
|---|---|---|
| Alloy C22 Seamless Pipes size | 4 to 219mm W. T.: 0.5 to 20mm | |
| DIN 2.4602 Welded Pipes size |
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| Nickel Alloy C22 EFW Pipes size | 5.0 -1219.2 mm | |
| Specialized in | Large Diameter Size | |
| 2.4602 Hastelloy Pipes Schedule | SCH5, SCH10, SCH40, STD, SCH80, SCH160 | |
| ASTM B619 N06022 Pipes Condition | Hot-Finished, Annealed, Cold-Drawn, Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF | |
| Hastelloy Alloy C22 Pipes Form | Hollow, Rectangular, Hydraulic, Straight, Square, Round, | |
| ASTM B619 UNS N06022 Pipes Length | Single Random, Double Random & Cut Length. | |
| End | Plain End, Beveled End, Treaded. |
ASTM B619 N06022 Pipe Chemical Composition
| Hastelloy C22 | Ni | C | Mo | Mn | Si | Fe | P | S | Co | Cr |
| Balance | 0.010 max | 12.5 – 14.5 | 0.50 max | 0.08 max | 2 – 6 | 0.02 max | 0.02 max | 2.5 max | 20 – 22.5 |
Hastelloy Alloy C22 Pipe Mechanical Properties
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.69 g/cm3 | 1399 °C (2550 °F) | Psi – 45000 , MPa – 310 | Psi – 1,00,000 , MPa – 690 | 45 % |
Why UNS N06022 (Alloy 22) is Used in Reactor Vessels
Comprehensive Corrosion Resistance: Alloy 22 offers excellent corrosion resistance to a wide range of corrosive media, including oxidizing acids (such as nitric acid) and reducing acids (such as sulfuric acid), which is highly beneficial in the complex reactor environment.
High Molybdenum and Tungsten Content: These elements provide excellent corrosion resistance to non-oxidizing acids and chloride-containing environments (common challenges in chemical reactors).
Resistance to Pitting and Crevice Corrosion: This is critical to the integrity of reactor vessels, as these types of corrosion can lead to premature failure.
Versatility: It performs well in mixed, contaminated, or high-temperature chemical streams, and its alloy composition enables it to withstand both oxidizing and reducing conditions that may occur in process streams.
Resistance to Stress Corrosion Cracking: This is another key advantage in the harsh service conditions of reactor vessels.
Common Applications
Alloy 22's properties make it an ideal choice for the following applications:
Chemical Processing: Equipment used to handle highly corrosive substances.
Nuclear Fuel Reprocessing: Its ability to withstand corrosive environments is crucial in the nuclear industry. Pollution control: For example, in flue gas desulfurization (FGD) systems.
Multi-purpose plants: Processes may fluctuate between oxidizing and reducing conditions.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications. We also offer customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
