一批桥梁板材，轧制后钢板有探伤不合格的情况。本文应用原位成分分析、金相检验、扫描电镜和显微硬度等分析方法，对此热轧板探伤不合格的原因进行了探讨。结果表明，由于碳在板材心部的偏析，使钢板中心出现了贝氏体组织，而导致探伤不合格。
High rejection rate of ultrasonic nondestructive testing was found for a batch of hotrolled bridge plates. The reasons for disqualification of plates were investigated by means of insitu composition analysis, metallography, scanning electron microscope and microhardness analyses. It was found that bainite appears at the center position of the bridge plates, due to the stabilisation of austenite caused by the severe segregation of C, S etc. Bainite is the main reason for disqualification of the plates.
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