以下为句子列表：
英文: In order to avoid eutectic carbide, improve nodularity, increase nodule count and increase mechanical properties, three times of inoculations were adopted in the centrifugally cast nodular iron pipes production: a) inoculation in ladle; 2) pouring stream
中文: 摘要在离心铸造球墨铸铁管生产中，为防止共晶渗碳体析出，改善球化，增加石墨球数，提高力学性能，采用了三次孕育：(1)包内孕育；(2)浇注时随流孕育；(3)型内孕育。
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