The　corrosion　characteristics　of　316SS　and　304SS　in　subcritical　and　supercritical　aqueous　systems　including　chloride　of　approximate　4600　mg/L　at　25　MPa　and　250　C,　350　C,　425　C,　and　520　C　are　comparatively　investigated.　Some　local　corrosion　areas　occurred　on　the　surfaces　of　SS316,　not　on　that　of　304SS,　at　250　C　and　425　C,　while　at　350　C,　all　the　sample　surfaces　were　covered　by　large　amounts　of　corrosion　products　and　clay　materials　due　to　the　predominant　precipitation　for　the　formation　of　the　outer　subscale.　Whether　in　reducing　subcritical　and　supercritical　industrial　sludge　suspension　or　in　oxidizing　supercritical　sludge　system,　304SS　owns　better　corrosion　resistance　than　316SS　due　to　higher　chromium　concentration　of　former.　©　2018　Trans　Tech　Publications.