Abstract

Recovery of materials from end-of-life products will contribute to the reduction in consumption of natural resources and global warming. For many decades, ships have been a major share of steel use, and used high quality steel products, mainly plates and high tensile strength steel. So, the steels contained in end-of-life ships should be useful for secondary resources. Therefore, it is important to estimate the in-use stock and demand of steel for ships from past to future. In this study, we conducted material flow analysis of steel for ships in global scale to estimate the in-use steel stock and demand in the future for ships. As the result, world in-use steel stock of ships was estimated as 540 million ton in 2009, and predicted to reach 900 million ton in 2035, 1.7 times in 2009. It was expected that future steel demand for ships would increase up to 41 million ton in 2035.

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