Abstract：The disqualification in ultrasonic flaw detection reasons for U71Mn heavy rail were analyzed by macrographic examination，optical microscopy and scanning electron microscope. The results show that the main factors of disqualification in flaw detection are central porosity，micro-cracks，MnS inclusion and nitride inclusion．The inner quality and qualification rate in ultrasonic detection are improved by means of optimization of melting，continuous casting，bloom cooling mode and rolling.
王建锋，张旭峰，郭朝军，汪 鹏. 重轨探伤不合的原因分析及改进研究[J]. 中国钢铁期刊网, 2017, 36(2): 17-21.
WANG Jian-feng，ZHANG Xu-feng，GUO Chao-jun，WANG Peng. Cause analysis and corrective measures of disqualification in ultrasonic flaw detection for heavy rail. Chinese Journal of Iron and Steel, 2017, 36(2): 17-21.
2017, Vol. 36 
