A New Economical Sigma-Free Duplex Stainless Steel 19Cr-6Mn-1.0Mo-0.5Ni-0.5W-0.5Cu-0.2N

作者:Chen Hong*; Ding Tie-suo; Jun, Li; Xiao Xue-shan; Zhao Jun-liang; Jiang Lai-zhu
来源:Journal of Iron and Steel Research International, 2011, 18(4): 52-57.
DOI:10.1016/S1006-706X(11)60050-2

摘要

A new resource-saving duplex stainless steel with composition of 19Cr-6Mn-1.0Mo-0.5Ni-0.5W-0.5Cu0.2N has been developed, and the microstructure, mechanical properties and corrosion properties have been investigated. The results show that the alloy has a balanced ferrite-austenite relation, and the ferrite content rises with the solution treatment temperature. The designed alloy is free of precipitation of sigma phase when aged at 650, 750 and 850 degrees C for 3 h, respectively, whereas a few Cr23C6 precipitates are found after being aged at 750 degrees C for 8 h. Charpy impact tests indicate that the impact energy of the alloy is 68, 200 and 220 J at 40, 0 and 25 degrees C, respectively. The designed alloy solution treated at 1 050 degrees C for 30 min has a much higher yield strength and similar corrosion resistance compared with those of AISI 304 austenitic stainless steel. Moreover, the production cost of the alloy is about $ 1 000 per ton which is lower than that of AISI 304.

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