Download file (344KB)
Download as zip (318KB)

コレクション

引用

代替タイトル: 9Cr鋼と18Cr鋼の水蒸気／超臨界水酸化の圧力依存性

説明:

9Cr ferritic/martensitic heat-resistant steel and 18Cr austenitic steel were exposed for various durations in a pressure vessel to steam (0.5 MPa), subcritical water (10.2 MPa), and supercritical water (22.7 MPa) at 650 °C. The pressure dependence of the oxidation rate constants of each material was determined from the time dependence of specimen weight gain and oxide scale thickness due to oxidation. The oxidation rate constants of both steels decreased with increasing pressure. In steam, the oxidation rate constant of the 18Cr steel was smaller than that of the 9Cr steel. The difference between the two steels decreased with increasing pressure, and the oxidation rate constants of the two steels became almost identical in supercritical water. These results suggest that, at 650 °C, boilers and pressure vessels can be safely operated using higher-pressure steam or supercritical water at the same temperature if they are designed based on the oxidation behavior of heat-resistant steels in steam at atmospheric pressure. The decrease in the oxidation rate constants with increasing pressure is considered to result from the reduction in voids in the formed oxide scales, which decreases the contact area between dissolved oxygen in steam or supercritical water and the metal.

権利情報:

• In Copyright
  

キーワード: heat-resistant steel, supercritical water, subcritical water, oxide scale, parabolic law, oxidation rate constant, thermal power plant

刊行年月日:

出版者:

掲載誌:

会議: International Symposium on High-temperature Oxidation and Corrosion 2026 (2026-10-18 - 2026-10-23)

研究助成金:

• JSPS 25K08550 (Oxidation and Corrosion Behavior of Metallic Materials by Acidic Supercritical Water Mixed with Solid Particles)
• Iron and Steel Institute of Japan (Oxidation and Corrosion Behavior of Heat-resistant Steels in Simulated Geothermal Fluids with High Temperature, Pressure, and Acidity)

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.8696

公開URL:

関連資料:

その他の識別子:

連絡先:

更新時刻: 2026-11-04 10:35:37 +0900

MDRでの公開時刻: 2026-11-04 12:32:01 +0900