Effect of Short-Time Aging on the Sensitization Characteristics of 310S Stainless Steel

Abstract

The sensitization characteristics of 310S stainless steel that was aged at 500 to 900 °C for less than 60 min were investigated by using a double-loop electrochemical potentiokinetic reactivation test (DL-EPR), scanning electron microscopy (SEM) and energy dispersive analysis (EDS). The 310S stainless steel was almost unsensitized after the aging treatments at 600 and 900 °C and was seriously sensitized at 700 and 750 °C. With the increase in aging time from 10 to 60 min, the degree of sensitization changed very slightly after aging at 600 and 900 °C and noticeably enlarged after aging at 700 and 800 °C. The precipitation of carbides during the short-term aging process led to Cr depletion at the grain boundary and then sensitized the 310S specimens.

Electrochemical Corrosion Behavior of 310S Stainless Steel in Hot Concentrated Tap Water

“…The experimental material is a commercial 310S austenitic stainless steel strip with a thickness of about 0.4 mm, whose chemical composition measured by an atomic absorption spectrometer (TALOS F200X) is (wt.%): C 0.04, Mn 1.21, P 0.02, Si 0.74, Cr 23.9, Ni 19.0, Mo 0.01, N 0.18, Ti 0.01, Al 0.02, and Fe balance [23]. The specimens were cut into a size of 10 mm × 10 mm, ground with 1000 grit SiC sandpaper, and pretreated in a nitric acid solution at 55 • C for 30 min.…”