Duplex stainless steels (DSS) have been growing continuously as they are cost effective alternative to austenitic stainless steel with better mechanical and corrosion resistance. Duplex stainless steel compositions are expanding in both directions towards leaner and richer chemistry for popular as well as very critical applications. The strength of DSS is its high yield strength compared to popular austenitic series and corrosion resistance particularly pitting and chloride stress corrosion cracking. Challenges of DSS remain in the embrittlement phase formation during the manufacturing of highly alloyed DSS, hot cracking and formability of the steel. Super duplex and hyper duplex steels are finding extremely critical application due to their good mechanical properties and corrosion resistance even replacing Nickel based alloys and Ti alloys in few applications. The paper reviews the characteristics and manufacturability of duplex stainless steel including recent developments.

双相不锈钢（DSS）一直在持续增长，因为它们是具有更好的机械和耐腐蚀性的奥氏体不锈钢的经济有效替代品。双相不锈钢成分在朝着更稀薄和更丰富化学的方向上都向着越来越广泛的方向发展，以普及和非常关键的应用。与流行的奥氏体系列相比，DSS的强度在于其高的屈服强度和耐腐蚀性，尤其是点蚀和氯化物应力腐蚀开裂。在高合金化DSS的制造过程中，DSS的挑战仍然在于脆化相的形成，钢的热裂化和可成形性。超级双相钢和超双相钢由于其良好的机械性能和耐蚀性而正在找到极其关键的应用，即使在极少数应用中也能替代镍基合金和Ti合金。本文回顾了双相不锈钢的特性和可制造性，包括最近的发展。