A890 7A

Grade 7A is a highly alloyed duplex stainless steel casting alloy specified by ASTM A890/A890M, designed for use in the most demanding corrosive and mechanical environments. With elevated levels of chromium, nickel, molybdenum, nitrogen, and tungsten, Grade 7A provides exceptional resistance to localized corrosion, including pitting and crevice corrosion, and excels in chloride-rich and acidic media. Its robust duplex microstructure offers superior strength and toughness compared to standard austenitic stainless steels, making it suitable for critical applications such as offshore platforms, subsea components, chemical reactors, and high-performance heat exchangers. Grade 7A is chosen where long-term durability, corrosion resistance, and structural reliability are paramount.