Interptetation of Inter-granular Corrosion of 06Cr19Ni10 Austenitic Stainless Steel

This paper gives an introduction to the principles and the influencing factors affecting the inter-granular corrosion of 06Cr19Ni10 austenitic stainless steel and the testing standards and the commonly used testing methods, and then presents some measures to control and reduce the inter-granular corrosion of austenitic stainless steel. The Oxidation of acid corrosive medium will exacerbate the inter-granular corrosion of 06Cr19Ni10 austenitic stainless steel; the sensitization temperature of Austenitic stainless steel falls in the range from 427 ℃ to 816 ℃, and the most sensitive temperature of inter-granular corrosion is at 650 ℃; the speed of inter-granular corrosion will decrease with the decrease of the austenitic grain size; Carbon is found to have a maximum impact in causing the inter-granular corrosion. Therefore, the reasonable control of the chemical composition, the strict control of the environment temperature, and the doing of solid solution treatment and the control of grain size so as to improve its corrosion resistance and reduction of the failure resulted from inter-granular corrosion are all crucial to avoid safety accidents.