方坯由于缺少生产任务，未测试使用寿命。
Lack of producing task, the square mould lifetime is not tested.
综合考虑，低拉速有益于普碳钢方坯内部质量的提高。
Comprehensive consideration, low drawing speed is good to the improvement of internal quality.
综合考虑，低拉速有益于普碳钢方坯内部质量的提高。
Comprehensive consideration, low drawing speed is good to the improvement of internal quality.
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