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A new resource-saving duplex stainless steel with composition of 19Cr-6Mn-1.0Mo-0.5Ni-0.5W-0.5Cu-0.2N 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 ℃ for 3 h,respectively,whereas a few Cr23C6 precipitates are found after being aged at 750 ℃ 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 ℃,respectively.The designed alloy solution treated at 1050 ℃ 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 ＄ 1000 per ton which is lower than that of AISI 304.
A new resource-saving duplex stainless steel with composition 19Cr-6Mn-1.0Mo-0.5Ni-0.5W-0.5Cu-0.2N 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 ° C for 3 h, respectively, a few Cr23C6 precipitates are found after being aged at 750 ° 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 ° C, respectively. The designed alloy solution treated at 1050 ° C for 30 min has a much higher yield strength and similar corrosion resistance than those of AISI 304 austenitic stainless steel. Moreover, the production cost of the alloy is about $ 1000 per ton which is lower than that of AISI 304.