22Cr High-Mn-N Low-Ni Economical Duplex Stainless Steels

A new family of economical duplex stainless steels in which N or Mn was substituted for Ni with composi- tion of 22Cr-8.0Mn-xNi-1.0Mo-0.7Cu-0.7W-0.3N （x = 0.5 -- 2.0） have been developed by examining the micro- structure, mechanical and corrosion properties of these alloys. The results show that the...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2012-02, Vol.19 (2), p.50-56
Main Authors: JIANG, Da-wei, GE, Chang-sheng, ZHAO, Xiang-juan, LI, Jun, SHI, Lu-lu, XIAO, Xue-shan
Format: Article
Language:English
Subjects:
Alloys
Applied and Technical Physics
Austenitic stainless steels
Corrosion
Duplex stainless steels
economical duplex stainless steel
Economics
Engineering
Iron and steel industry
low-temperature impact property
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Nickel
Physical Chemistry
Pitting (corrosion)
pitting corrosion resistance
Processes
Steels
冲击性能
决策支持系统
双相不锈钢
固溶处理
家庭经济
氮化物
镍含量
高锰
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Summary:A new family of economical duplex stainless steels in which N or Mn was substituted for Ni with composi- tion of 22Cr-8.0Mn-xNi-1.0Mo-0.7Cu-0.7W-0.3N （x = 0.5 -- 2.0） have been developed by examining the micro- structure, mechanical and corrosion properties of these alloys. The results show that these alloys have a balanced ferrite-austenite relation. In addition, the alloys are free of precipitation of sigma phase and Cr-nitride when solution- treated at 750 to 1300℃ for 30 min. The yield strength, tensile strength and fracture elongation values of experi- mental alloys solution-treated at 1050 ℃ for 30 min are about 500, 750 MPa and 40.0%, respectively. Low-temper- ature impact properties can be improved distinctly with the increase of nickel content. Among the designed DSS al- loys, the alloy with Ni of 2.0% is found to be an optimum alloy with proper phase proportion, better low-tempera- ture impact properties and higher pitting corrosion resistance compared with those o~ other alloys. The mechanical and corrosion properties and lower production cost of the designed DSSs are better than those of AISI 304.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(12)60059-4