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针对近年汽车用钢板提高防锈特性的需要，使镀锌钢析等表面处理钢板的重要性急速加剧。作为它的素材，ＩＦ钢被开发，其生产量大幅度增加。另一方面，这种ＩＦ钢与过去的钢种相比．具有不同的特性，特别是在最终制品上容易发生因炼钢因素所引起的分层或气泡等缺陷。针对这个课题，在新日铁进行了多方面的调查研究并采取了一定的措施，因而确立了ＩＦ钢大量生产体制。本文就ＩＦ钢的高质量化以及在建立稳定生产体制时对炼钢方面的改进、开发的经过作了介绍。
In view of the need of improving the anti-rust properties of automotive steel plates in recent years, the importance of surface-treated steel plates such as galvanized steel plates has rapidly increased. As its material, IF Steel was developed, its production increased significantly. On the other hand, this IF steel compared with the previous steel. Have different characteristics, especially in the final product prone to delamination or bubbles due to steelmaking and other defects. In response to this issue, the Nippon Steel conducted a wide range of investigations and studies and took certain measures, thus establishing a large IF steel production system. This article describes the improvement of IF steel and the development of IF steel when it comes to the quality of IF steel and the establishment of a stable production system.