A total of 25 stave-cooled blast furnaces has been put into operation at Nippon Steel Corp. since 1969. NSC has been making to improve the campaign life of each stave-cooled BF to a extent. This paper refers to a new type stave cooler which can eliminate brick laying work. Aimed at reducing both the capital cost and the changing ratio of working profiel in the course of the wear of brick work through a campaign life, this stave was developed. As a result of the finite element method analysis of stave cooler's temperature distribution and thermal stress, it was drawn an inference that 600 mm including 200 mm cast-in brick layer replacing the function of conventional brick wall of 600 mm in thickness would be equivalent in the life of BF's campaign, and that under the high heat flux tapered rib would be useful for supporting cast-in brick.
This stave was put into practical use in the belly and shaft part of Kamaishi No. 1BF and Tobata No. 1BF, and is functioning satisfactorily.
