Effect of chemical compositions on IGSCC resistance for strain hardened low carbon austenitic stainless steels in high temperature water

Toshio Yonezawa, Hiroshi Kanasaki, Masaki Taneike, Yasuhiro Sakaguchi, Suguru Ooki, Hideshi Tezuka, Kenro Takamori, Shunichi Suzuki

    研究成果: Conference contribution

    2 被引用数 (Scopus)

    抄録

    In order to clarify the mechanisms and develop the alternative materials on intergranular stress corrosion cracking (IGSCC) for the non-sensitized and strain hardened low carbon austenitic stainless steel in oxygenated water, the SCC resistance was studied for 24 laboratory melted steels and commercial type 31 OS stainless steel by the SCC propagation tests. From this study, it is concluded that the SCC resistance of the strain hardened low carbon austenitic stainless steel in high temperature water mainly increases with increasing of nickel contents and nickel equivalent value. The effects of chromium content, chromium equivalent value on the SCC resistance were hidden by the effects of the nickel contents and nickel equivalent value, in this study. The effects of the carbon content, nitrogen content, minor elements, hardness, grain size, delta ferrite content etc. on the SCC resistance were not so pronounced in this study. Non-cracked materials in this study showed the highest stacking fault energy (SFE) value which was calculated from the literature equations. It is strongly suggested that the SFE value is a key parameter for the SCC resistance of the non-sensitized and strain hardened low carbon austenitic stainless steels. From these test results, low carbon - low nitrogen - low silicon - low manganese - 20 % nickel - 25 % chromium -2.5 % molybdenum steel is recommended as an alternative high SCC resistant low carbon austenitic stainless steel. Following future works are recommended. 1) To develop a reliable calculation formula for SFE value of the austenitic stainless steels according to chemical compositions 2) To verify the superiority of the above new alternative stainless steel under practical fabrication 3) To develop an IGSCC resistant stainless steels within chemical composition range specified in JIS or ASTM material standard.

    本文言語English
    ホスト出版物のタイトル14th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors 2009
    ページ1274-1288
    ページ数15
    出版ステータスPublished - 2009 12 1
    イベント714th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors 2009 - Virginia Beach, VA, United States
    継続期間: 2009 8 232009 8 27

    出版物シリーズ

    名前14th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors 2009
    2

    Other

    Other714th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors 2009
    CountryUnited States
    CityVirginia Beach, VA
    Period09/8/2309/8/27

    ASJC Scopus subject areas

    • Nuclear Energy and Engineering
    • Environmental Engineering

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