The　effect　of　aging　treatment　time　on　the　microstructure　and　intergranular　corrosion　resistance　of　UNS　S32304　stainless　steel　with　solid　solution　state　and　rolled　state　was　investigated　by　optical　microscopy，　scanning　electron　microscopy　and　energy　spectrometer.　The　sensitivity　of　intergranular　corrosion　of　samples　with　different　states　after　aging　treatment　for　different　time　was　evaluated　by　double-cycle　potentiodynamic　reactivation　test　and　oxalic　acid　corrosion　test.　The　results　showed　that　no　secondary　phase　was　found　in　the　solid　solution　sample　after　aging　for　0.　5　h,　and　secondary　austenite　was　preferentially　precipitated　in　ferrite　in　the　rolled　sample.　After　aging　for　4　h，　the　spherical　M　C　　and　small　granular　secondary　austenite　precipitated　at　the　phase　boundary　of　the　solid　solution　sample，　while　only　serrated　secondary　austenite　precipitated　along　the　phase　boundary　of　the　rolled　sample.　With　the　aging　time　prolonging，　the　serrated　secondary　austenite　of　the　two　samples　became　wide　and　extended　into　ferrite，　and　when　the　aging　treatment　time　was　the　same，　the　precipitation　amount　of　the　secondary　phase　in　the　rolled　sample　was　more　than　that　in　the　solid　solution　sample.　In　addition，　prolonging　the　time　would　also　increased　the　sensitization　coefficient　of　intergranular　corrosion　of　samples　with　solid　solution　state　and　rolling　state,　the　latter＇s　sensitization　coefficient　was　larger　than　the　former，　and　its　corrosion　resistance　was　not　as　good　as　the　former.　©　2023,　Shanghai　Research　Institute　of　Materials.　All　rights　reserved.