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结合美国麦克唐纳厂型钢轧机的改造项目，介绍了该厂老式轧机改造的技术特点和设计思路，为国内外老轧机改造提供了经验。
Combined with the reconstruction project of the US McDonald’s mill, the technical features and design ideas of the mill’s old mill transformation were introduced, which provided experiences for the transformation of the old mill at home and abroad.