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千叶6号高炉(内容积4500m~3)于1977年6月17日投产到1998年3月24日停产,创造了两项世界纪录:铁水总产量达到6023万吨,累计运行7586天(20年零9个月)。在投入第二代炉役(内容积扩大到5153m~3)前,为了缩短大修时间,研究和采用了旧炉体大块拆卸和新炉体提前装配的大块环形构件法。其结果,大修仅用了62天(3月25日到5月25日),比传统的大修缩短近一半时间。
Chiba No. 6 blast furnace (internal volume 4500m ~ 3) was put into operation on June 17, 1977 and was discontinued on March 24, 1998. Two world records were created: the total output of hot metal reached 60.23 million tons and the cumulative operation was 7586 days (20 Years and nine months). In order to shorten the overhaul time before the second generation of furnace service (inner volume expanded to 5153m ~ 3), a large annular member method was studied and adopted, which was the disassembly of the old furnace body and the preassembly of the new furnace body. As a result, the overhaul took only 62 days (March 25 to May 25), reducing nearly half the time required for the traditional overhaul.