Effect of Tungsten Content on Microstructure and Properties of New Type High Chromium, Manganese and Nitrogen Duplex Stainless Steels Cr29Mn12Ni2N0.6Wx

Influence of tungsten content on the microstructure, mechanical properties and corrosion resistance of a new type high chromium, manganese and nitrogen duplex stainless steels with a composition of Fe-29Cr-12Mn-2Ni-0.6N-xW (x=1,2,3) was investigated. The results show that Fe-29Cr-12Mn-2Ni-0.6N-xW steels after solution treating had typical dual-phase microstructure of ferrite and austenite, and the ferrite content was in the range of 45%-60%. With the increase of tungsten content, precipitation tendency of σ phase and ferrite content in the alloy enhanced, corrosion resistance of the alloy reduced, and yield strength and ultimate tensile strength increased. When Fe-29Cr-12Mn-2Ni-0.6N-xW steels were solution treated at 1 050 ℃ for 30 min, there was no σ phase precipitation in the microstructure, yield strength, ultimate tensile strength and percentage elongation were beyond 650 MPa, 900 MPa and 30% respectively. So these type alloy has a bright future in application as high strength resource-saving super duplex stainless steels.