Hastelloy B2 vs C276 Alloy
Hastelloy B2 vs C276 Alloy
Hastelloy B2 performs excellently in reducing environments, such as hydrochloric acid and sulfuric acid; while Hastelloy C276 offers broader corrosion resistance, capable of withstanding both reducing and oxidizing environments, including chlorine, hypochlorites, and various high-temperature organic/inorganic chemicals. Therefore, although B2 performs better in its specific applications, C276 has a wider range of uses in various chemical processing, pollution control, and marine applications. Furthermore, C276 has better resistance to pitting and crevice corrosion and is generally easier to weld.
What are the material standards for C276?
C-276 alloy (UNS N10276) is an austenitic nickel-molybdenum-chromium alloy with a small amount of tungsten added. It is one of the high-quality corrosion-resistant materials commonly used in process industries. C-276 alloy exhibits excellent corrosion resistance in both oxidizing and reducing environments.
Hastelloy B2 and C276 Introduction
Hastelloy B-2 (UNS N10665, Werkstoff 2.4617) is a nickel-molybdenum alloy, primarily composed of nickel (Ni) and molybdenum (Mo), with extremely low carbon and silicon content. It exhibits excellent resistance to reducing agents, making it particularly suitable for strong hydrochloric acid and other highly corrosive reducing media. Its superior corrosion resistance, good mechanical strength, and weldability make it ideal for many applications involving harsh chemical conditions, such as chemical reactors, heat exchangers, ships, oil refining, and wastewater treatment plants, especially in the presence of strong reducing acids.
Hastelloy C-276 (UNS N10276, W. Nr. 2.4819) is a nickel-molybdenum-chromium alloy. It contains nickel, molybdenum, chromium, and small amounts of iron and tungsten. It possesses excellent corrosion resistance, high-temperature performance, and mechanical strength, as well as outstanding toughness, strength, and good weldability. This material is specifically designed to resist corrosion from strong acids, chlorides, oxides, and other extreme environments, and is widely used in industries such as petrochemicals, chemical processing, energy, and metallurgy. Therefore, it is particularly suitable for environments where both oxidizing and reducing agents are present, such as flue gas desulfurization systems, chemical plants, and nuclear waste treatment.
Chemical Composition of Hastelloy B2 vs C276
| Element | Hastelloy C276 (%) | Hastelloy B2 (%) |
| Carbon (C) | ≤0.01 | ≤0.02 |
| Manganese (Mn) | ≤1.00 | ≤1.0 |
| Phosphorus (P) | ≤0.04 | ≤0.040 |
| Sulfur (S) | ≤0.03 | ≤0.030 |
| Silicon (Si) | – | ≤0.10 |
| Chromium (Cr) | 14.5 – 16.5 | ≤1.0 |
| Nickel (Ni) | Remainder (rem) | Balance |
| Molybdenum (Mo) | 15.0 – 17.0 | 26.0 – 30.0 |
| Cobalt (Co) | ≤2.5 | ≤1.0 |
| Iron (Fe) | 4.0 – 7.0 | ≤2.0 |
| Tungsten (W) | 3.0 – 4.5 | – |
| Vanadium (V) | ≤0.35 | – |
Physical Properties of Hastelloy B2 vs C276
Hastelloy B2 has a higher density and a fixed melting point, which helps in temperature control and improves energy efficiency. C276 alloy is lighter, has a wider melting range, and better thermal stability, making it more suitable for applications such as aerospace where temperature and weight requirements are stringent.
| Property | Hastelloy B2 | Hastelloy C276 |
| Density (g/cm³) | 9.2 | 8.89 |
| Melting Point (°C) | 1370 | 1350 – 1390 |
Mechanical properties of Hastelloy B2 vs C276
Hastelloy B2 has a higher density and a fixed melting point, which helps in temperature control and improves energy efficiency. C276 alloy is lighter, has a wider melting range, and better thermal stability, making it more suitable for applications such as aerospace where temperature and weight requirements are stringent.
| Element | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Hastelloy B2 | Psi – 110,000 , MPa – 760 | Psi – 51,000 , MPa – 350 | 40% |
| Hastelloy C276 | Psi – 52,000 , MPa – 355 | Psi – 115,000 , MPa – 790 | 40% |
Corrosion Resistance of Hastelloy B2 vs C276
Hastelloy B2 exhibits excellent corrosion resistance in many reducing environments, particularly to hydrochloric acid of any concentration and temperature at atmospheric pressure. Under anaerobic conditions, it also shows good resistance to moderate concentrations of sulfuric acid, phosphoric acid of various concentrations, and high-temperature organic acids (such as acetic acid and formic acid). Furthermore, it resists corrosion from bromic acid, hydrogen chloride gas, and halide catalysts. Therefore, Hastelloy B2 is widely used in demanding chemical and petrochemical processes, such as hydrochloric acid distillation, ethylbenzene alkylation, and low-pressure acetic acid production.
Hastelloy C276 exhibits excellent corrosion resistance to most corrosive media in both oxidizing and reducing atmospheres. It possesses excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. It is one of the few materials capable of withstanding corrosion from moist chlorine gas, hypochlorites, and chlorine dioxide solutions. It also demonstrates excellent resistance to high-concentration chloride solutions (such as ferric chloride and copper chloride solutions).
Comparison of Properties of Hastelloy B2 and C276
Hastelloy B2:
Iron and chromium content is kept to a minimum to prevent the formation of the β-phase Ni₄Mo.
Excellent corrosion resistance in reducing environments.
Good corrosion resistance to moderate concentrations of sulfuric acid and many non-oxidizing acids.
Strong resistance to chloride-induced stress corrosion cracking (SCC).
Excellent corrosion resistance to a variety of organic acids.
Hastelloy C276:
Excellent corrosion resistance
Excellent high-temperature performance
Good mechanical properties
Excellent weldability
Comparison of Applications of Hastelloy B2 and C276
Hastelloy B2 is a nickel-based alloy widely used in many harsh environments due to its excellent heat and corrosion resistance. It has wide applications in chemical, petrochemical, energy production, and pollution control fields, especially suitable for industries involving substances such as H₂SO₄, HCl, H₃PO₄, and CH₃COOH.
Hastelloy C-276 is widely used in the chemical and petrochemical industries, including components and catalytic systems that come into contact with chloride-containing organic compounds. It is particularly suitable for high-temperature environments, mixed-impurity inorganic/organic acids (such as formic acid and acetic acid), and seawater corrosion.
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About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including 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. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
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