Abstract
The influence of multiple heat treatments on sensitization of austenitic stainless steels were studied. Boiling copper sulfate-sulfuric acid tests were conducted on SUS 304, 316, 304L and 316L stainless steels sensitized by single or multiple heat treatments. Results obtained are as follows:(1) The sensitization region of SUS 304 stainless steel in a time-temperature-sensitization diagram expands to the higher temperature side when the steel is heated at 500°C for 24 h after pre-sensitization heat treatments up to 925°C.(2) The sensitization region of SUS 304 stainless steel expands to the lower temperature side when the steel is heated at temperatures less than 675°C after pre-sensitization heat treatment at 700°C for 30 s.(3) The sensitization region of SUS 304 stainless steel is not affected by the pre-sensitization heat treatment when the steel is heated at 600-800°C after the pre-sensitization heat treatment at 500°C for 24 h.(4) No influence is recognized of multiple heat treatments on sensitization of SUS 316, 304L and 316L stainless steels.(5) These results can be explained by considering the nucleation and growth of chromium carbides and the corrosion rate of chromium deplated zone in a boiling copper sulfate-sulfuric acid solution.
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