The sea water resistance of members of the duplex family of UNS S32304, S31803 and S32750 is very different. UNS S32304 should not be used in sea water and UNS S31803 has roughly the same corrosion resistance as AISI 904L. Finally, there is the superduplex stainless steel UNS S32750, with a similar resistance to austenitic 6Mo-steels. A 'super' stainless steel here refers to a high alloy stainless steel with a PRE (PRE= Cr + 3.3Mo + 16N) of more than 40. The superduplex UNS S32750, 25Cr-7Ni-4Mo, has a PRE of minimum 41. It has now been in service for more than 10 years. Extensive experience of using SAF 2507 in different environments has been gained. Experiences of the use in sea water of the three duplex stainless steels UNS S32304, S31803 and S32750 are summarised in the paper and instructions for good practice are given. Results are also given from an exposure of butt-welded tubes exposed in natural sea water. No significant corrosion was found on the samples included in this test.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Duplex stainless steels in sea water - instruction for good practice and results from exposure of butt-welded tubes


    Contributors:


    Publication date :

    2001


    Size :

    15 Seiten, 6 Bilder, 4 Tabellen, 12 Quellen



    Type of media :

    Article/Chapter (Book)


    Type of material :

    Print


    Language :

    English




    Investigation of pitting corrosion behaviour of welded duplex stainless steels

    Gobbon,M.E. / Univ.d.Bundeswehr Hamburg,DE | Automotive engineering | 1994


    Duplex stainless steels for offshore use

    Bendall, K. | Tema Archive | 1992


    Duplex stainless steels for chemical tankers

    Charles, J. / Vincent, B. | Tema Archive | 1997


    Drydock butt welded underwater

    Wolfe, I. | Engineering Index Backfile | 1964


    What savings from butt-welded rail?

    Engineering Index Backfile | 1953