A995 1B

Grade 1B is a duplex stainless steel casting alloy defined by ASTM A995/A995M, designed for pressure-containing components requiring a combination of high strength and excellent resistance to corrosion. Its composition includes chromium, nickel, molybdenum, copper, and nitrogen, forming a balanced austenitic-ferritic microstructure that enhances resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking. Grade 1B is well-suited for service in harsh environments such as seawater, brine, and aggressive chemical processing systems. It is commonly used in pump bodies, valves, manifolds, and other components found in offshore oil and gas, desalination, and chemical handling applications, where long-term reliability and corrosion performance are essential.