News / ClassNK calls for upgraded steel plate tolerance in mega-boxship construction

Japanese classification society ClassNK is claiming a “world-first” breakthrough finding in the required crack arrest toughness of steel plates used in the construction of ultra-large container vessels (ULCVs).

In response to the huge increases in containership sizes over the past decade and the need to ensure their structural reliability, in January 2013  the International Association of Classification Societies (IACS) released its “Unified Requirements” for the use of extremely thick steel plates, outlining a minimum brittle crack arrest toughness value of 6,000 N/mm 3/2 ...