統計データにもとづく鉄鋼製品のライフサイクルインベントリ分析

抄録

A life cycle inventory analysis for CO₂ emission from steel products in Japan, based on statistics in 1995 was carried out under the system boundary at the ports of resources and materials exporting to Japan. And we assumed that iron scrap doesn't have the energy and environmental factors.
The analytical results show that the CO₂ emission from electric arc furnace route is amounted to about 28 % of that from integrated steel route due to the scrap treatment on LCA. Although a large amount of ferroalloys are consumed and imported for the production of stainless cold coils, the CO₂ emission from the production of ferroalloys in foreign countries was excluded in this study. The calculated result from assuming the same CO₂ emissions for the production of ferroalloys in the foreign countries as in Japan, shows that the CO₂ emissions in the foreign countries are 32 % and 45 % from integrated steel route and from electric arc furnace route, respectively for the production of stainless cold coil. It is also shown that the CO₂ emission in foreign countries for the production of carbon steel coils is little because a small amount of ferroalloy is consumed.