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Steel is one of the most recyclable materials, and thus it is recycled repeatedly. In the past three decades, end-of-life recycling rates have fluctuated over than 80% in Japan.1) In addition, even if disused steel was not be recovered at its end-of-life and remained within the technosphere for a while, it can be recovered later when its price increases.1) When steel scrap is recovered from end-of-life products, some materials other than carbon steel are mixed into the scrap. In steelmaking processes, some impurity elements, known as tramp elements, cannot be extracted from molten steel. Tramp elements in other materials that are present in the scrap can remain in recycled steel products. Through repeated recycling, contamination by tramp elements is possible.2–4) The average length of time from when steel is consumed as a finished product to when steel is recovered as steel scrap is estimated to be around 20 years.5,6) However, at least in reinforced bar steel, the contents of tramp eleQuantifying the Total Amounts of Tramp Elements Associated with Carbon Steel Production in Japan