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| 转底炉 (Each tube billet is check-weighed and passed by a conveyer to a large furnace with a rotating hearth which passes through several temperature zones in the furnace so that finally the steel has been heated to 1250°C. 对每一管坯进行称量校核后，通过运输机将管坯运送到一个大型转底炉中，炉底旋转经过炉子的几个温度区，最终将钢管坯加热到 1250°C。) | |||
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