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

钢铁研究学报(英文版), 2012, 19(2): 50-56.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

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

2.Jiangsu JosenSpecial Steel Products Co Ltd, Xinghua 225721, Jiangsu, China

3.Institute of Materials, Shanghai University, Shanghai 200072, China

4.Institute of Materials, Shanghai University, Shanghai 200072, China

5.Institute of Materials, Shanghai University, Shanghai 200072, China

6.Institute of Materials, Shanghai University, Shanghai 200072, China

基金项目: Item Sponsored by Innovation Fund of Education Commission of Shanghai Municipality o5 China(09yz20)

关键词：双相不锈钢 , 家庭经济 , 镍含量 , 氮化物 , 冲击性能 , 高锰 , 决策支持系统 , 固溶处理

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

Keywords： economical duplex stainless steel , low-temperature impact property , pitting corrosion resistance ,

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.

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

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