A New Economical Sigma-Free Duplex Stainless Steel 19Cr-6Mn-1. 0Mo-0. 5Ni-0. 5W-0. 5Cu-0.2N

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...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2011-04, Vol.18 (4), p.52-57
Main Authors: Chen, Hong, Ding, Tie-suo, Li, Jun, Xiao, Xue-shan, Zhao, Jun-liang, Jiang, Lai-zhu
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Engineering
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Physical Chemistry
Processes
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Summary: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 °C for 3 h, respectively, whereas a few Cr 23 C 6 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 1 050 °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.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(11)60050-2