Abstract：In a factory for the production of steel plate 16MnR ultrasonic flaw detection is not up to standard, according to results of the testing site for taking a serious defect microstructure analysis, results showed that: failure detection caused by continuous casting center segregation and the non-metallic inclusions are the main reasons,leading to brittle phase and steel matrix separation then the emergence of internal crack. Rolling in other conditions remain unchanged, through the optimization of reduction rules at the rough rolling stage of the extension of rolling, can significantly improved the dectection rate of qualified.
