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Super ODS steels R&D for fuel cladding of next generation nuclear systems, 10; Cladding tube manufacturing and summary

原子力システム高効率化に向けた高耐食性スーパーODS鋼の開発,10; 被覆管加工

鵜飼 重治*; 大貫 惣明*; 林 重成*; 皆藤 威二; 井上 賢紀; 木村 晃彦*; 藤澤 敏治*; 奥田 隆成*; 阿部 冨士雄*

Ukai, Shigeharu*; Onuki, Somei*; Hayashi, Shigenari*; Kaito, Takeji; Inoue, Masaki; Kimura, Akihiko*; Fujisawa, Toshiharu*; Okuda, Takanari*; Abe, Fujio*

重金属冷却高速増殖炉及び超臨界水冷却高速増殖炉用の燃料被覆管として、優れた高温強度と高耐食性の両方を兼ね備えた酸化物分散強化型フェライト鋼(スーパーODS鋼)の開発を進めている。本報では、開発中のスーパーODS鋼の被覆管加工について強化した結果について報告する。

The super ODS cladding were manufactured into 8.5 mm outer diameter and 0.5 mm thickness by using pilger.mill rolling and intermediate heat treatment. The final heat treatment was successfully conducted at 1150 $$^{circ}$$C for 1h to make perfectly recrystallized structure. The manufactured cladding exhibits a secondary recrystallized grains with {110} $$<$$100$$>$$ Goss orientation. As a summary of super ODS steels R&D, the ODS steel, 16Cr-4Al-2W-0.1Ti added with small amount of Hf or Zr, is the prime candidate of "Super ODS steels" which has high strength at elevated temperatures, high resistance to corrosion for SCW and LBE, and high resistance to irradiation.

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