The microstructure evolution

mechanical properties and corrosion resistance of low nickel austenitic stainless steel were investigated by means of optical microscope（OM）

scanning electron microscope（SEM）

universal material testing machine and electrochemical workstation within the solution temperature range from 1 000℃to 1 200℃.The results reveal that the austenite content is increased and the ferrite content is decreased with the temperature rising from 1 000℃to 1 050℃.After 1 050℃

the austenite content is decreased and the ferrite content is increased with the increase of temperature.The ferrite content is increased obviously and the grain size is decreased at 1 200 ℃.The tensile results show that the solution temperature has a little effect on the tensile strength

which has the highest value of 780 MPa at 1 050 ℃

while has a great influence on the elongation

which has the highest value of 39.98%at 1 200℃.The polarization curve test shows that the alloy has the desirable corrosion resistance at 1 150℃

where the value of corrosion current density reaches 6.637μA·cm-2.