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Rotary piercing mill. A piercing mill (Mannesmann mill) is used to turn a round piece of metal into a seamless thick-walled tube. The ingot is first preheated to approximately 1250 degrees Celsius and then it is fed between two specially-shaped rotating rolls. The mandrel between the rolls causes the ingot to hollow.
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Details
Creative#:
TOP22291775
Source:
達志影像
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RM
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須由TPG 完整授權
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