Accounting for Steel Stock in Japan

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  • DAIGO Ichiro
    Department of Material Engineering, Graduate School of Engineering, The University of Tokyo
  • IGARASHI Yuma
    Department of Material Engineering, Graduate School of Engineering, The University of Tokyo
  • MATSUNO Yasunari
    Department of Material Engineering, Graduate School of Engineering, The University of Tokyo
  • ADACHI Yoshihiro
    Department of Material Engineering, Graduate School of Engineering, The University of Tokyo

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Other Title
  • 日本における鉄鋼材の物質ストック量の導出
  • ニホン ニ オケル テッコウザイ ノ ブッシツ ストックリョウ ノ ドウシュツ

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Abstract

During the last two decades, the total material input in Japan has been about 2 billion tons, and approximately 50%, i.e., about 1 billion tons has accumulated as the net addition to stock in the form of buildings, social infrastructure, and various kinds of products. The amount of the net addition to stock is calculated annually from the differential between the input and the output. Therefore, the contents of the accumulated stock are unknown. It is said that these unknown contents include material that has already been discarded as invisible waste. In this study, dynamic material flow analysis was conducted to quantify the amount of stock that is not associated with social activities and cannot possibly be collected as scrap in the future. First, we defined some terms: in-use stock, hibernating stock, and overall stock. Hibernating stock comprises the steel used for the constructional material of landfill site, the steel dissipated by corrosion and erosion, etc. Furthermore, we defined the system boundary to account for the steel stock and constructed equations to calculate the three types of stock. To calculate the amount of in-use stock, a dynamic model—the population balance model—was adopted. The amounts of in-use stock and hibernating stock in Japan from 1980 to 2000 were calculated. The result shows that 0.96 billion tons of the in-use stock is included in the 1.22 billion tons of overall stock in the year 2000.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 93 (1), 66-70, 2007

    The Iron and Steel Institute of Japan

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