First approval issued for corrosion resistant steel for crude oil cargo tanks

27 Apr 2011

Japanese classification society ClassNK says that it has issued the first type approval for corrosion resistant steel to the new NSGP-1 steel manufactured by Nippon Steel Corporation’s Oita Works.

The approval certifies that the material, which has been specifically designed for the inner bottoms of the cargo oil tanks of crude oil tankers, complies with the IMO’s latest  performance standard for corrosion resistant steels. The IMO adopted the new requirements, SOLAS Regulation II-1/3-11, at the MSC 87 meeting in May 2010, to allow the application of corrosion resistant steels to cargo oil tanks as an alternative to the use of coatings. Crude oil tankers over 5,000 dwt contracted after 1 Jan 2013 will thus be required to apply either protective coatings or corrosion resistant steel to the inner surfaces of the cargo oil tanks.

Class NK believes the use of approved corrosion-resistant steel provides an economical alternative to the expensive preparation and finishing work associated with coating application, and reduces the maintenance requirement, so the demand for steels such as Nippon Steel Corporation’s NSGP®-1 is expected to be strong in the future.

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