NSSMC is planning to conduct more advanced analyses with the support of the ‘Joint R&D with Industries and Academic Partners’ scheme of Nippon Kaiji Kyokai (ClassNK). ClassNK is also considering assigning notations to ships with higher safety, such as for ships in which NSafe-Hull is used, in order to further improve ship safety.
The first bulk carrier adopting NSafe-Hull was launched in August for Mitsui O.S.K. Lines. NSafe-Hull – a highly ductile steel plate for shipbuilding with improved collision safety – was developed by Nippon Steel & Sumitomo Metal Corporation (NSSMC) and adopted through the collaborative R&D by NSSMS, Imabari Shipbuilding and the National Maritime Research Institute (NMRI).
Due to NSafe-Hull’s superior ductility, the energy absorbed before breaking hull in the case of a side collision could be roughly triple that for a ship made of conventional steels thereby increasing the ship’s durability compared with conventional steels. The Mitsui O.S.K. Lines ship used approximately 3,000 tons of NSafe-Hull for structural parts where high collision safety performance was required, such as the side plates of cargo holds and fuel tanks.