Development of the toughness-improved reduced-activation F82H steel for demo reactor

K. Shiba, H. Tanigawa, T. Hirose, T. Nakata

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


A toughness-improved type ofF82H steel called F82H mod3 has been developed, and the material properties and irradiation behavior have been examined. The significant modification of the chemical composition is the reduction of Tt (<10 ppm) and N (<20 ppm) as impurities and the increase of Ta (0. I %) as an alloying element. The ductile-to-brittle transition temperature (DBTT) is improved to -90°C from -45°C for F82H IEA without change in strength. However, the creep rupture time of F82H mod3 was 1/10 of F82H IEA. Another feature of the F82H mod3 is the stability of the material properties. Higher temperature normalization (1080°C) degrades the DBTT only to -80°C due to grain coarsening without large change in strength. It is quite important for largescale production of the material in high quality. Preliminary neutron irradiation experiments up to 17 dpa showed better irradiation resistance to changes in fracture toughness than F82HIEA.

Original languageEnglish
Pages (from-to)145-149
Number of pages5
JournalFusion Science and Technology
Issue number1
Publication statusPublished - 2012
Externally publishedYes


  • Mechanical properties
  • Steels ferritic /'martensitic
  • Structural materials

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • General Materials Science
  • Mechanical Engineering


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