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LTV钢铁公司在其克里夫兰厂C-6号高炉换衬时更换了炉顶,将原用的McKee料钟炉顶改为紧凑式无料钟炉顶(简称CBLT)。这是世界上采用这种炉顶的第三个
LTV Steel replaced the roof at the Cleveland Plant C-6 blast furnace, changing the original McKee chimney top to a compact chimney-free top (CBLT). This is the third of the world to adopt such a roof