Gnee Steel is a company specializing in the production of Hastelloy C276 alloy products, Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs.
Learn more about Hastelloy C276 and duplex stainless steel 2205
Learn more about Hastelloy C276 and duplex stainless steel 2205
Hastelloy C276 is a high-quality nickel-molybdenum-chromium superalloy that offers exceptional corrosion resistance in extreme corrosive environments and at high temperatures. 2205 duplex stainless steel is a high-strength, cost-effective stainless steel with excellent resistance to chloride corrosion, making it ideal for marine or oil and gas applications. C276 performs better in highly corrosive environments such as demanding chemical processing, while 2205 is more suitable for general industrial use in moderately corrosive environments, offering better cost-effectiveness.
Is duplex stainless steel 2205 magnetic?
Duplex stainless steel 2205 exhibits both magnetic and non-magnetic properties. The presence of ferrite in its microstructure gives it a magnetic response. However, the presence of the austenite phase reduces its overall magnetism.
Overview of Hastelloy C276 and Duplex Stainless Steel 2205
Hastelloy C276: A nickel-based alloy whose core advantage lies in its excellent overall corrosion resistance, especially in harsh reducing and oxidizing media. It can be considered the "ultimate weapon" for solving extreme corrosion problems, but it is very expensive.
Duplex Stainless Steel 2205: A duplex stainless steel whose core advantages are high strength, good resistance to chloride stress corrosion cracking, and excellent cost-effectiveness. It is a "high-performance upgrade" to standard stainless steels such as 316L, suitable for applications requiring higher strength and pitting corrosion resistance, but its performance in extreme corrosive environments is not as good as C276.
Chemical composition of Hastelloy C276 and duplex stainless steel 2205
| Element (%) | Hastelloy C276 | Duplex 2205 | Role of Element |
| Nickel (Ni) | Balance (~57%) | 4.5–6.5 | Enhances toughness and resistance to reducing acids and stress corrosion |
| Chromium (Cr) | 14.5–16.5 | 21.0–23.0 | Improves resistance to oxidizing media |
| Molybdenum (Mo) | 15.0–17.0 | 2.5–3.5 | Enhances pitting and crevice corrosion resistance |
| Nitrogen (N) | – | 0.08–0.20 | Increases strength and pitting resistance of stainless steel |
| Iron (Fe) | 4.0–7.0 | Balance (~67%) | Base element |
| Tungsten (W) | 3.0–4.5 | – | Enhances molybdenum's effects and improves corrosion resistance |
2205 Stainless Steel and Hastelloy C276 Mechanical Properties
Strength:
The performance of 2205 alloy is significantly superior to that of C276 alloy. Due to its duplex structure, the yield strength of 2205 alloy (≥450 MPa) is almost twice that of C276 alloy (≥315 MPa) and 316 stainless steel (≥205 MPa). This means that a thinner wall thickness can be used under the same design pressure, thus reducing equipment weight.
Toughness and Ductility:
C276 alloy performs better than 2205 alloy. The pure austenitic structure of C276 alloy gives it excellent plasticity and toughness, especially in low-temperature environments. Although 2205 alloy also has good toughness, it is generally not as good as C276 alloy.
Corrosion Resistance of Alloy C276 and Duplex 2205 Stainless Steel
C276 Alloy: Excellent performance. It exhibits strong corrosion resistance to various reducing acids (e.g., sulfuric acid, hydrochloric acid, phosphoric acid), oxidizing salts (e.g., Fe³⁺, Cu²⁺), chloride ions, solvents, and wet chlorine gas and hypochlorites. Its pitting resistance equivalent number (PREN = %Cr + 3.3×%Mo + 16×%N) is very high (approximately 78).
2205 Steel: Good performance. Its corrosion resistance is far superior to 304/316L stainless steel, especially in chloride-containing environments. Its pitting resistance equivalent number (PREN ≈ 35) is much higher than 316L (≈26), but lower than C276. It performs well in medium concentrations of sulfuric acid, nitric acid, and other media, but undergoes severe corrosion in hot concentrated sulfuric acid, hydrochloric acid, and other strong reducing acids.
Stress Corrosion Cracking (SCC): Both exhibit excellent resistance to chloride stress corrosion cracking, which is a common advantage.
Pitting and Crevice Corrosion: Both perform well, but C276 is far superior to 2205. C276 can be used in extreme environments with higher temperatures and higher chloride ion concentrations.
Non-oxidizing Acids (e.g., sulfuric acid, hydrochloric acid): C276 performs far better than 2205. The corrosion resistance of 2205 in these acids is limited, especially at high temperatures.
Comparison of Application Fields for Hastelloy C276 and Duplex 2205
Typical applications of Hastelloy C276:
The most demanding environments in the chemical processing industry: for example, reactors, heat exchangers, and piping.
Flue gas desulfurization (FGD) systems (e.g., absorption towers, spray nozzles).
Downhole components and piping in sour gas fields (high H₂S, CO₂, Cl⁻ environments).
Reaction vessels and piping in the pharmaceutical and fine chemical industries.
Equipment for handling wet chlorine gas and sodium hypochlorite.
Critical components in waste incineration and wastewater treatment.
Typical applications of Duplex Stainless Steel 2205:
Oil and gas industry: subsea pipelines, pressure vessels, heat exchangers (especially suitable for environments containing CO₂ and trace amounts of H₂S and Cl⁻).
Chemical tanker storage tanks.
Digesters and bleaching equipment in the pulp and paper industry.
Petrochemical industry: atmospheric and vacuum distillation units, heat exchangers and piping in catalytic cracking units.
Building structures: for coastal areas, bridges, and other applications requiring high strength and weather resistance (as a replacement for 316L stainless steel).
Selection Guide
| Property | Hastelloy C276 | Duplex 2205 |
| Material Type | Nickel-based alloy | Duplex stainless steel |
| Main Advantage | Exceptional overall corrosion resistance | High strength + Good chloride corrosion resistance + Cost-effectiveness |
| Disadvantage | Very high cost | Poor corrosion resistance in strong reducing acids; strict welding requirements |
| Suitable Environments | "Universal" for harsh corrosive environments, especially those containing reducing acids, high temperatures, and high chloride ions | Chloride-containing neutral/oxidizing environments where high strength is required |
| Cost | Very high | Moderate to high |
Gnee Steel is a professional manufacturer 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. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy industries, and we can provide customized alloy material solutions according to customer needs. For alloy material price inquiries or to request customized alloy material solutions, please feel free to contact us at ru@gneesteelgroup.com for a quote.