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在实验室及生产现场系统地研究了影响连铸球铁管伸长率的诸因素，结果表明影响连铸球铁管伸长率的主要因素是连铸生产工艺、热处理和冶金因素。
The factors influencing the ductility of continuous casting ductile iron pipe were systematically studied in the laboratory and production site. The results show that the main factors that affect the ductility of continuous ductile iron pipe are continuous casting process, heat treatment and metallurgical factors.