Superb Resistance to Pitting Crevice Corrosion and Stress Corrosion Cracking with Hastelloy C276/Inconel 276/2.4819 Nut
Hastelloy C276 (also known as Inconel 276 or 2.4819) nuts are high-performance fasteners made from a nickel-molybdenum-chromium alloy with excellent corrosion resistance. They withstand harsh environments, including strong oxidizing and reducing agents, making them ideal for chemical processing, marine, and aerospace applications. These nuts resist pitting, crevice corrosion, and stress corrosion cracking, even in acidic and high-temperature conditions. Hastelloy C276 nuts maintain mechanical strength and stability up to 1000°C (1832°F). Their superior resistance to chloride-induced attack makes them suitable for offshore and desalination projects. Common standards include ASTM B574 and DIN 2.4819. These nuts are available in hex, heavy hex, and other configurations, ensuring secure fastening in extreme environments requiring durability and reliability.
Trade code
| Chemical Composition Wt.% | % | Ni | Cr | Fe | C | Mn | Si | Mo | V | P | S | Co | W |
| Min | Bal. | 14.5 | 4 | | | | 15 | | | | | 3.0 |
| Max | Bal. | 16.5 | 7 | 0.01 | 1.0 | 0.08 | 17 | 0.35 | 0.04 | 0.03 | 2.5 | 4.5 |
| Physical Constants | Density(g/cm³) | 8.9 |
| Melting Range(℃) | 1325-1370 |
| Minimum mechanical properties of alloy at room temperature | Typical mechanical properties | Tensile strength Rm N/mm² | Yield strength RP 0.2 N/mm² | Elongation A5 % |
| Solution treatment | 690 | 283 | 40 |
Hastelloy C276 (also known as Inconel 276 or 2.4819) nuts are widely used in extreme environments due to their exceptional corrosion resistance and high-performance properties.
Here are the key features:
1. Corrosion Resistance
- Outstanding resistance to strong oxidizing and reducing environments
- Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking
- Performs well in acidic conditions (sulfuric, hydrochloric, phosphoric acids, etc.)
- Resists corrosion in chloride-rich environments and seawater
2. High-Temperature Performance
- Maintains strength and stability up to 1,090°C (2,000°F)
- Good resistance to oxidation and carburization in high temperatures
3. Mechanical Strength
- High tensile and yield strength compared to standard stainless steels
- Excellent fatigue resistance under cyclic loading conditions
4. Chemical Composition
- Mainly composed of Nickel (Ni) (~57%), with additions of Molybdenum (Mo) (~16%), Chromium (Cr) (~15.5%), and Iron (Fe) (~5-7%)
- Low carbon content minimizes carbide precipitation during welding
Hastelloy C276 (also known as Inconel 276 or 2.4819) nuts are widely used in industries requiring exceptional corrosion resistance and high mechanical strength.
Here are their primary applications:
1. Chemical Processing Industry
- Used in reactors, heat exchangers, and piping systems handling highly corrosive chemicals like hydrochloric acid, sulfuric acid, and chlorine.
- Ideal for fastening components in aggressive chemical environments.
2. Marine and Offshore Industry
- Resistant to seawater and brine, making them suitable for offshore platforms, shipbuilding, and underwater applications.
- Used in desalination plants and marine heat exchangers.
3. Aerospace Industry
- Employed in aircraft exhaust systems, jet engines, and other high-temperature areas where oxidation and corrosion resistance are crucial.
4. Power Plants
- Found in nuclear power plants, flue gas desulfurization (FGD) systems, and geothermal energy plants due to their resistance to sulfur compounds and acidic gases.
5. Pulp and Paper Industry
- Used in bleaching equipment and digesters where strong acids and chlorine compounds are present.
6. Pharmaceutical & Food Processing
- Suitable for environments where contamination must be avoided and where aggressive cleaning chemicals are used.
7. Waste Treatment Facilities
- Applied in waste incineration plants and sewage treatment facilities due to their ability to withstand harsh and corrosive waste environments.
