Corrosion resistant steel for cargo tanks of oil tankers

With the development of deep-sea explorationand ocean shipping, higher and higher requirements are put forward for the corrosion resistance of ship plates and marine structures, including atmospheric corrosion resistance, seawater corrosion resistance and crude oil corrosion resistance. Among them, corrosionresistant steel for cargo tanks of oil tankers has been the focus of international research and development in recent ten years.

Oil tanker is an important tool for international crude oil transportation. Its cargo tanks are mainly made of AH32 and AH36 steel plates with poor corrosion resistance, which are coated for corrosion protection. For the coating protection form, the coating maintenance shall be carried out regularly, which is expensive, long construction period and harsh construction environment. In 2010, the International Maritime Organization (IMO) identified the use of corrosionresistant steel as an alternative to protective coatings. In 2013, IMO's performance standard for marine corrosion-resistant steel was officially implemented.

In addition, in order to improve the service life of offshore structures, it is necessary to develop test methods for seawater corrosion resistance, mainly ESSO test and double tensile test proposed by Japan classification society.

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