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取代普通炼焦炉－高炉－氧气顶吹转炉技术的开发正在引起世界炼钢专家的关注。这些新工艺技术的另一项工艺已达到了日产１０００ｔ的水平。因为美国钢铁研究院－能源部（ＡＩＳＩ－ＤＯＥ）开发的直接炼钢计划，已开始选用第一个日产钢１０００ｔ的示范工厂，所以，本文书报道下一个主要计划项目。本文重点叙述该项计划最近的试验阶段，现在的关键问题是炼铁。随后是炼铁与炼钢两者的结合，包括某些正在审定的基本原理。
The development of replacing the common coke ovens - blast furnace - oxygen top blown converter technology is arousing the attention of world steelmaking experts. Another of these new process technologies has reached the level of Nissan 1000t. Because the direct steelmaking program developed by the U.S. Iron & Steel Institute-Energy Department (AISI-DOE) has started to use the first demonstration plant of Nissan Steel at 1000 t, this instrument covers the next major planned project. This article focuses on the most recent pilot phase of the program, and the key issue now is ironmaking. This is followed by a combination of both ironmaking and steelmaking, including some of the rationale for validation.