A New Resource-Saving, High Chromium and Manganese Super Duplex Stainless Steels 29Cr-12Mn-2Ni-1Mo-xN

作者：Ma Zheng huan^*; Zhao Xiang juan; Ge Chang sheng; Ding Tie suo; Li Jun; Xiao Xue shan

来源：Journal of Iron and Steel Research International, 2011, 18(9): 41-46.

• duplex stainless steel
• microstructure
• mechanical property
• pitting potential

A new family of resource-saving, high chromium and manganese super duplex stainless steels (DSSs), with a composition in mass percent, % of Cr 0. 29, Mn 0. 12, Ni 2. 0, Mo 1. 0, and N 0. 51-0. 68, has been developed by examining the effect of N on the microstructure, mechanical properties and corrosion properties. The results show that these alloys have a balanced ferrite-austenite relation. The austenite volume fraction decreases with the solution treatment temperature, but it increases with an increase in N content. The increases in nitrogen enhance the ultimate tensile strength (UTS) and reduce the ductility of the material slightly. The pitting corrosion potential increases first and then decreases with an increase in nitrogen content when the amount of N arrives to 0. 68%. The yield stress and ultimate tensile strength of solution-treated samples were more than 680 and 900 MPa, the elongation of experimental alloys are higher than 30%, respectively, what is more, the pitting potentials were beyond 1 100 mV.

• 出版日期2011-9
• 单位上海大学