Hastelloy C-276: Corrosion-Resistant Alloy for Factory Construction & Decoration Machinery in Chloride Environments

Performance Characteristics

1. Excellent Corrosion Resistance: Hastelloy C-276 is renowned for its exceptional corrosion resistance. It can withstand a wide range of highly corrosive chemical environments, including oxidizing and non-oxidizing acids. It is particularly resistant to pitting and crevice corrosion caused by chloride ions, even in high concentrations of hydrochloric and sulfuric acids.
2. Good Weldability: The alloy's low carbon and silicon content make it highly resistant to cracking and intergranular corrosion during welding. It can be welded using various methods, such as Gas Metal Arc Welding (GMAW/MIG), Gas Tungsten Arc Welding (GTAW/TIG), and Shielded Metal Arc Welding (SMAW/Stick).
3. High Strength and Toughness: C-276 offers high strength and excellent toughness, maintaining its performance in high-temperature and high-pressure applications. It is suitable for manufacturing components that need to withstand significant stress.
4. Resistance to Stress Corrosion Cracking: The alloy is highly resistant to stress corrosion cracking caused by chlorides, making it ideal for environments where such issues are common, such as in the petrochemical and marine industries.

Applications

1. Chemical Industry: Used to manufacture reactors, heat exchangers, and towers that can withstand highly corrosive chemicals.
2. Oil and Gas Industry: Employed in the production of pipelines, valves, and pumps in oil fields and refineries, especially in environments containing hydrogen sulfide.
3. Marine Engineering: Due to its excellent resistance to seawater corrosion, it is used in offshore platforms and ship components.
4. Pharmaceutical and Food Processing: Ideal for equipment that comes into contact with pharmaceuticals and food products, such as reactors and piping, ensuring product purity and safety.
5. Electronics and Electrical Industry: Used in electronic components and electrical equipment housings that require corrosion and high-temperature resistance.

Manufacturing and Processing

• Heat Treatment: The production of Hastelloy C-276 involves strict heat treatment processes to ensure optimal mechanical and corrosion-resistant properties. Typically, the material is heated to 980-1020°C for 1-1.5 hours, then raised to 1080-1120°C or 1100-1160°C for 15-16 hours, followed by air cooling.
• Forging and Forming: The alloy can be forged, hot-rolled, and hot-extruded. Forging requires precise temperature control to maintain the material's toughness and strength.
• Cold Working: C-276 can be cold-worked, but its work-hardening characteristics mean that multiple annealing steps may be necessary to restore the material's properties during processing.

Standards and Specifications