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Before each swaging operation, the middlecase is refired to a temperature of 1100°C so as to temporarily reduce the hardness of the steel from 250 to 170 vickers. |
中文意思: 每道冲压工序开始前,需将表壳胚件重新加热到摄氏1,100度,以便暂时将表壳材质的硬度从华氏250度降低至到170度。 |
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