1. What are the grades of Hastelloy alloy?
Hastelloy B Series: Focused on resistance to hydrochloric acid and other reducing acids, such as Hastelloy B-2, B-3, and B-4.
Hastelloy C Series: Designed for resistance to oxidizing and mixed corrosive media, including Hastelloy C-276, C-22, C-2000, C-4, and C-3.
Hastelloy G Series: Optimized for handling both oxidizing and reducing acids (e.g., sulfuric acid, phosphoric acid), such as Hastelloy G-30, G-35, G-180, and G-50.
Other Special Grades: Includes Hastelloy X (for high-temperature structural applications), Hastelloy N (for molten salt environments), and Hastelloy W (for high-strength, corrosion-resistant scenarios).
2. What are the most commonly used grades of Hastelloy alloy?
Hastelloy C-276: The most popular grade, valued for exceptional resistance to a broad range of corrosive media (e.g., acids, chlorides, and organic compounds) and moderate high-temperature stability. It is widely used in chemical processing and environmental protection.
Hastelloy C-22: A upgraded version of C-276 with improved resistance to crevice corrosion and pitting, making it suitable for harsh chloride-rich environments like seawater treatment.
Hastelloy B-2: The primary choice for handling strong reducing acids (e.g., concentrated hydrochloric acid) at moderate temperatures, commonly used in chemical reactors and acid storage equipment.
Hastelloy G-30: Frequently used in industries dealing with mixed acids (e.g., sulfuric-phosphoric acid mixtures), such as fertilizer production and metal pickling.
3. What is the most common application of Hastelloy alloy?
Fabrication of reactors, heat exchangers, and storage tanks for processing acids (e.g., sulfuric acid, hydrochloric acid, phosphoric acid) and organic chemicals.
Components for flue gas desulfurization (FGD) systems in power plants, where the alloy resists corrosion from acidic flue gases and slurries.
Parts for pharmaceutical and food processing equipment, as Hastelloy's high purity and corrosion resistance prevent contamination of products.
Additionally, they are used in aerospace (e.g., high-temperature engine parts with Hastelloy X) and nuclear energy (e.g., molten salt reactor components with Hastelloy N), but these are less common than chemical processing applications.
