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针对用户反映的莱钢生产的S355NL钢制作的风电法兰个别批次探伤合格率偏低的问题,通过对该批次探伤不合格法兰缺陷部位运用超声波进行定位,对缺陷部位取样进行金相和扫描电镜分析,最终确认了钢水浇注温度过高和铸坯的二次冷却不均匀所导致的中心疏松和中心偏析是造成该批次S355NL钢风电法兰探伤不合格的主要原因,并提出了相应的改进措施。
According to the problem that the qualified rate of flaw detection of individual flanges of wind power produced by S355NL steel produced by LaiSteel is too low, the defective parts of the flanges were spotted with ultrasonic waves and the defects were sampled for metallography And scanning electron microscopy analysis, finally confirmed the molten steel pouring temperature is too high and the secondary cooling uneven slab caused by the center of loose and center segregation is caused by the batch S355NL steel flange failure of the main reason for wind testing, and proposed Corresponding improvement measures.