New Economical 19Cr Duplex Stainless Steels |
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Authors: | Jun Li Zixing Zhang Hong Chen Xueshan Xiao Junliang Zhao Laizhu Jiang |
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Affiliation: | (1) Institute of Materials, Shanghai University, 200072 Shanghai, P.R. China;(2) Baoshan Iron & Steel Co., Ltd, Shanghai, 200431, P.R. China;; |
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Abstract: | New economical duplex stainless steels (DSSs) containing 19Cr-6Mn-xNi-1.0Mo-0.5W-0.5Cu-0.2N (x = 0.5 to 2.0) were developed, and the microstructure, impact property, and corrosion resistance of the alloys were studied.
The ferrite content increases with the solution treatment temperature, but decreases with an increase in nickel. The sigma
phase is not found precipitating in the alloys treated with solution from 1023 K to 1523 K (750 °C to 1250 °C). The low-temperature
impact energy of the experimental alloys increases first and then decreases rapidly with an increase in nickel, which is mainly
due to the martensite transformation with an increase in austenite. The alloys have a better mechanical property and pitting
corrosion resistance than AISI 304. Among the designed DSS alloys, 19Cr-6Mn-1.3Ni-1.0Mo-0.5W-0.5Cu-0.2N is found to be an
optimum alloy with proper phase proportion, a better combination of mechanical strength and elongation, and higher pitting
corrosion resistance compared with those of the other alloys. |
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