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New Economical 19Cr Duplex Stainless Steels

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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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  2. Thermo-Calc is a trademark of the company Thermo-Calc Software AB, Stockholm.

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Acknowledgments

This work was sponsored by the key project of Science and Technology Commission of Shanghai Municipality under Contract No. 065211026 and the Innovation Fund of Education Commission of Shanghai Municipality under Contract No. 09yz20.

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Authors and Affiliations

  1. Institute of Materials, Shanghai University, 200072, Shanghai, P.R. China

    Jun Li (Postdoctoral Student), Zixing Zhang (Masters), Hong Chen (Masters) & Xueshan Xiao (Professor)

  2. Baoshan Iron & Steel Co., Ltd, Shanghai, 200431, P.R. China

    Junliang Zhao (Senior Engineers) & Laizhu Jiang (Senior Engineers)

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  1. Jun Li
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  2. Zixing Zhang
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  3. Hong Chen
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  4. Xueshan Xiao
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  5. Junliang Zhao
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Correspondence to Xueshan Xiao.

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Manuscript submitted August 7, 2010.

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Li, J., Zhang, Z., Chen, H. et al. New Economical 19Cr Duplex Stainless Steels. Metall Mater Trans A 43, 428–436 (2012). https://doi.org/10.1007/s11661-011-0916-4

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