| In this study, the effect of annealing temperatures, especially without the additional stabilization treatment, on the intergranular corrosion in STS 321 stainless steel was investigated. Nitric acid immersion and Electrochemical Potentiokinetic Reactivation(EPR) tests were periormed to find out an optimum annealing temperature. Also the effect of annealing temperature in relation with the sensitization, i.e. precipitation behavior of the Ti-precipitates, was studied. According to the microscopic results, titanium nitrides formed by solidification and also sulfides were observed in the hot band. On the other hand, titanium carbides and carbosulfides were detected in the annealed hot strip. The optimum annealing temperature for improving intergranular corrosion resistance was found about 1020∼1040℃. This was related to the increase of titanium carbide precipitation during sensitization. |
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