A890 1B

Grade 1B is a duplex stainless steel casting alloy defined by ASTM A890/A890M, designed for use in pressure-containing components requiring both high strength and excellent corrosion resistance. It consists of a balanced austenitic-ferritic microstructure and is alloyed with chromium, nickel, molybdenum, copper, and nitrogen, delivering superior resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking. This grade is especially suited for demanding applications in chemical processing, offshore oil and gas platforms, desalination, and pulp and paper industries. Grade 1B castings offer a combination of mechanical durability and corrosion performance in aggressive environments, making them a preferred choice where long-term reliability is essential.