Nickel alloys and high alloyed stainless steels have proven their resistance to seawater in many marine, offshore and oil and gas applications and have been recently considered for use in seawater cooled plate type heat exchangers as an alternative to Titanium. To avoid biofouling the seawater is usually chlorinated for example with hypochlorite, which is highly corrosive to many stainless steels and may cause severe crevice and pitting corrosion. The present paper gives an overview of laboratory tests under crevice conditions in nonchlorinated and chlorinated artificial seawater (3mg/L free chlorine) at 50 deg C and 75 deg C. The materials tested were the 6%Mo stainless steels alloy 926 (UNS N08926) and alloy 31 (UNS N08031), and the nickel alloys 825 (UNS N08825), 625 (UNS N06625), C-276 (UNS N10276) and 59 (UNS N06059). In nonchlorinated artificial seawater only the alloys 825 and 625 showed slight crevice attack at 75 deg C. In chlorinated artificial seawater alloy 31 was resistant at 50 deg C; alloy 59 was fully resistant at both 50 deg C and 75 deg C. The success achieved by using the relatively new but already well established alloys 31 and 59 is emphasized. The results of laboratory testing are accompanied by field trials and examples of successful application.


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    Titel :

    Successful applications of nickel alloys and high alloyed stainless steels in seawater service


    Weitere Titelangaben:

    Erfolgreiche Anwendungen von Nickellegierungen und hochlegierten korrosionsfesten Stählen für Anwendungen im maritimen Bereich


    Beteiligte:


    Erscheinungsdatum :

    2008


    Format / Umfang :

    17 Seiten, 4 Bilder, 18 Tabellen, 10 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch