An intergranular corrosion is observed in austenitic stainless steels exposed to high temperature, concentrated nitric acid (HNO3) solution with highly oxidizing ions. It is an important degradation mechanism of austenitic stainless steels for use in a nuclear fuel reprocessing plant. The intergranular corrosion is caused by the segregation of impurities to grain boundaries and the resultant formation of active sites. Extra High Purity (EHP™) austenitic stainless steel was developed with conducting the new multiple refined melting in order to suppress the total harmful impurities less than 100ppm. The intergranular corrosion behavior of EHP alloys with various impurities was examined in boiling HNO3 solution with highly oxidizing ions to find a correlation between the intergranular corrosion and the impurities of EHP alloys. A good correlation was confirmed between the degree of intergranular corrosion and the corrosion rate. The relationships between the corrosion rate and the impurities content of EHP alloys was determined using a multiple regression analysis. The influence on corrosion rate became small in order of B, P, Si, C, S and Mn. It was important to control B in intergranular corrosion behavior of EHP alloys.
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17th International Conference on Nuclear Engineering
July 12–16, 2009
Brussels, Belgium
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-4351-2
PROCEEDINGS PAPER
Influence of Impurities on Intergranular Corrosion of Extra High Purity Austenitic Stainless Steels
Ikuo Ioka,
Ikuo Ioka
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
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Jun Suzuki,
Jun Suzuki
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
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Takafumi Motoka,
Takafumi Motoka
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
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Kiyoshi Kiuchi,
Kiyoshi Kiuchi
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
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Junpei Nakayama
Junpei Nakayama
Kobe Steel, Ltd., Kobe, Hyogo, Japan
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Ikuo Ioka
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
Jun Suzuki
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
Takafumi Motoka
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
Kiyoshi Kiuchi
Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
Junpei Nakayama
Kobe Steel, Ltd., Kobe, Hyogo, Japan
Paper No:
ICONE17-75531, pp. 563-567; 5 pages
Published Online:
February 25, 2010
Citation
Ioka, I, Suzuki, J, Motoka, T, Kiuchi, K, & Nakayama, J. "Influence of Impurities on Intergranular Corrosion of Extra High Purity Austenitic Stainless Steels." Proceedings of the 17th International Conference on Nuclear Engineering. Volume 1: Plant Operations, Maintenance, Engineering, Modifications and Life Cycle; Component Reliability and Materials Issues; Next Generation Systems. Brussels, Belgium. July 12–16, 2009. pp. 563-567. ASME. https://doi.org/10.1115/ICONE17-75531
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