On-board pipes of tankers, which are called 'cargo oil pipes', are used for loading/unloading crude oil and seawater. Accordingly, they are exposed to seawater containing crude oil on both of their inner and outer surfaces, and so generally 400 MPa class steel pipes (STPY400) without coating or Cr-added cast-iron pipes are used. Cargo oil pipes must have corrosion wear resistance, in addition to resistance to seawater corrosion. To meet this demand, JFE Steel developed an anti-seawater corrosion steel pipe (JFE-MARINE-COP) which has the weldability equivalent to 400 MPa class steel pipes and the corrosion resistance and corrosion wear resistance same as cast ion pipes, and has been manufacturing and selling the product since 1998. This report describes the characteristics and service performance of JFE-MARINE-COP. The corrosion rate of JFE-MARINE-COP, which contains approximately 1% Cr, is about 50% of that of 400 MPa class steels which do not contain Cr. In a corrosion wear test under conditions simulating seawater containing sludge, JFE-MARINE-COP showed corrosion wear resistance about two times better than that of 400 MPa class steels. JFE-MARINE-COP which contains less carbon suffers no weld cold cracks at the welded portion in the oblique Y-groove weld cracking tests even without preheating. The appearance of a cross section of JFE-MARINE-COP after three years of on-board service as cargo oil pipe without coating is presented. Both the base material and welded portion of the steel pipe showed very little mass loss caused by general corrosion and local corrosion. The excellent performance is due to the suppression of preferential corrosion at the welding heat affected zone by the effect of the homogeneous microstructure of the base material and the welding heat affected zone combined with the effect of adding Cu, Ni, and Ca. JFE-MARINE-COP is available at strengths equivalent to those of STPY400 and STK490 of JIS G 3457, in an approximate size range from 76.3 to 1016 mm in outer diameter and 9.5 to 23.0 mm in wall thickness. (Engl. translation from JFE Giho No.9 (Aug 2005), P.57-58 (jap.))


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    Title :

    Sea water corrosion resistant cargo oil pipe for tankers, 'JFE-MARINE-COP'


    Additional title:

    Meerwasserkorrosionsbeständige Ladeölrohre für Öltanker, 'JFE-MARINE-COP'


    Published in:

    Publication date :

    2006


    Size :

    2 Seiten, 4 Bilder



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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