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根据多年的实践经验，提出了一种改进的孕育处理工艺，从而实现了ＱＴ５０－５不需进行热处理工艺便能满足延伸率为５％的技术要求。
Based on many years of practical experience, an improved inoculation process is proposed, so that the QT50-5 can meet the technical requirements of an elongation of 5% without the need of a heat treatment process.