Stress corrosion cracking of type 304 austenitic stainless steel in sulphuric acid solution including sodium chloride and chromate |
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Authors: | Rokuro Nishimura Yasuaki Maeda |
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Affiliation: | Department of Applied Materials Science, College of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Sakai, Osaka 599-8531, Japan |
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Abstract: | The stress corrosion cracking (SCC) of a commercial austenitic stainless steel type 304 was investigated as functions of chloride concentration, chromate concentration and test temperature under a constant applied stress condition in 0.82 kmol/m3 sulphuric acid solution by using a constant load method. From the dependence of the three parameters (, steady state elongation rate; tss, transition time; tf, time to failure) obtained from corrosion elongation curve on chloride/chromate concentrations and test temperature, a parameter for predicting time to failure and critical values of chromate concentration and test temperature, below which little SCC takes place, were estimated. In addition, a transgranular SCC mechanism was qualitatively inferred and then the effect of chromate and chloride on SCC behavior was discussed. |
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Keywords: | Type 304 Chromate Steady state elongation rate Prediction Sulphuric acid Corrosion elongation curve Sodium chloride Critical value TGSCC |
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