Hastelloy C276 vs G30 alloy
Gnee Steel
Hastelloy C276 vs G30 alloy
Hastelloy C-276 is a versatile nickel-based alloy that performs well in both oxidizing and reducing environments and is renowned for its excellent corrosion resistance. Hastelloy G-30, on the other hand, is a high-chromium nickel-based alloy specifically designed for superior performance in highly corrosive oxidizing acids, such as wet-process phosphoric acid. Due to its higher chromium and copper content, G-30 outperforms C-276 in these specific corrosive media. While C-276 offers broad protection (including against pitting/crevice corrosion), G-30 performs particularly well under extreme oxidizing conditions and high phosphorus content, making it ideal for fertilizer/chemical processing.
Gnee Steel
What are the uses of Hastelloy C276?
Hastelloy C276 seamless steel pipes have wide applications in the oil and gas industry, especially in harsh environments and corrosive fluid environments. These pipes are commonly used on offshore platforms, in oil refineries, and in petrochemical plants.
What is Hastelloy G30?
Hastelloy G30 is renowned for its exceptional corrosion resistance in phosphoric acid environments. Composed of nickel, chromium, and molybdenum, it is primarily used in the chemical processing and petrochemical industries. G30 alloy exhibits extremely strong resistance to pitting, crevice corrosion, and stress corrosion cracking. It also demonstrates excellent corrosion resistance in chloride environments. Hastelloy G30 is commonly used in environments containing sulfuric acid, hydrochloric acid, and hydrofluoric acid, making it ideal for pharmaceuticals, pulp and paper manufacturing, and flue gas desulfurization.
What is Hastelloy C276?
Hastelloy C276 is a commonly used alloy widely applied in the chemical processing and oil and gas industries. Composed of nickel, molybdenum, and chromium, it possesses excellent resistance to oxidation, reduction, alkalis, and chlorides. C276 alloy has been used in wet chlorine environments and exhibits excellent resistance to stress corrosion cracking and localized corrosion. It is also suitable for components subjected to high mechanical stress and high-temperature environments, such as industrial processes containing large amounts of sulfur dioxide.
Chemical composition of Hastelloy C276 and Hastelloy G30
| Element | Hastelloy G30 (UNS N06030) | Hastelloy C276 (UNS N10276) |
|---|---|---|
| Nickel (Ni) | ≥ 58.0 % (Balance) | ≥ 57.0 % (Balance) |
| Chromium (Cr) | 28.0 – 31.5 % | 14.5 – 16.5 % |
| Iron (Fe) | 13.0 – 17.0 % | 4.0 – 7.0 % |
| Molybdenum (Mo) | 4.0 – 6.0 % | 15.0 – 17.0 % |
| Tungsten (W) | 1.5 – 4.0 % | 3.0 – 4.5 % |
| Cobalt (Co) | ≤ 5.0 % | ≤ 2.5 % |
| Copper (Cu) | 1.0 – 2.4 % | – |
| Carbon (C) | ≤ 0.03 % | ≤ 0.01 % |
| Manganese (Mn) | ≤ 1.5 % | ≤ 1.0 % |
| Silicon (Si) | ≤ 0.80 % | ≤ 0.08 % |
| Phosphorus (P) | ≤ 0.04 % | ≤ 0.04 % |
| Sulfur (S) | ≤ 0.02 % | ≤ 0.03 % |
| Vanadium (V) | – | ≤ 0.35 % |
Physical properties of Hastelloy C276 and Hastelloy G30
| Physical Property | Hastelloy G30 (Annealed) | Hastelloy C276 (Annealed) |
|---|---|---|
| Density (g/cm³) | 8.22 | 8.89 |
| Melting Range (°C) | 1330 – 1380 | 1325 – 1370 |
| Modulus of Elasticity (GPa) | 205 | 205 |
| Thermal Conductivity (W/m·K, at 20°C) | 10.5 | 11.1 |
| Coefficient of Thermal Expansion (×10⁻⁶/K, 20–100°C) | 12.8 | 11.2 |
| Electrical Resistivity (μΩ·m, at 20°C) | 1.25 | 1.30 |
| Specific Heat (J/kg·K, at 20°C) | 440 | 427 |
| Magnetic Permeability | Typically non‑magnetic | Typically non‑magnetic |
| Poisson's Ratio | 0.30 | 0.30 |
| Thermal Diffusivity (mm²/s, at 20°C) | ~3.0 | ~2.9 |
Differences between Hastelloy G30 and C276 Alloy
There are several differences between Hastelloy G30 and C276:
G30 is best suited for environments containing phosphoric acid, while C276 is better suited for environments containing oxidizing or reducing acids.
C276 has a wider tolerance range to inorganic and organic chemicals than G30.
C276 is more resistant to pitting and crevice corrosion than G30.
C276 can be used at temperatures up to 1900°F, while G30 can be used at temperatures up to 1800°F.
Hastelloy G30 vs C276 Alloy Corrosion Resistance
Both Hastelloy G30 and C276 are renowned for their exceptional corrosion resistance. However, their specific corrosion resistance varies depending on the corrosive environment. Hastelloy G30 exhibits excellent corrosion resistance in sulfuric acid environments, especially at high temperatures. This makes it the material of choice for equipment and piping in sulfuric acid production and processing facilities.
In contrast, Hastelloy C276 demonstrates superior corrosion resistance to a wider range of corrosive media, including hydrochloric acid, nitric acid, and various organic acids. It also effectively resists pitting and crevice corrosion in chloride-containing environments. These properties make C276 a popular choice for chemical processing plants, marine applications, and other harsh environments.
Key Characteristics and Applications:
Nickel Alloy G30:
Exhibits excellent corrosion resistance to oxidizing acids, especially nitric acid, and mixed acid environments containing phosphoric acid, hydrochloric acid, and fluorides.
Excellent resistance to localized corrosion such as pitting and crevice corrosion.
G30 can be used in high-temperature environments up to 1800°F (982°C).
Widely used in the chemical processing industry, especially suitable for applications such as nitric acid production, pickling, and scrubbing.
Nickel Alloy C276:
Exhibits excellent corrosion resistance to a variety of corrosive environments, including oxidizing and reducing acids, chlorinated media, seawater, and brine solutions.
High resistance to stress corrosion cracking and pitting.
C276 can be used in high-temperature environments up to 1900°F (904°C).
Widely applicable in various industries including chemical processing, pollution control, pulp and paper production, and waste treatment.
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.