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为找出500 MPa钢板探伤不合格原因,通过金相显微镜、扫描电镜、能谱分析和电子探针波谱仪对500 MPa钢板探伤缺陷组织、成分进行了分析。结果表明:钢板探伤不合格的原因是由钢板中心偏析带上的裂纹导致,MnS、Nb/Ti夹杂物是造成裂纹的主要原因。通过提高钢水洁净度,降低钢水过热度,优化二次冷却技术,采用电磁搅拌和轻压下提高铸坯内部质量,同时适当优化铸坯加热工艺以及轧后堆垛缓冷方式,可以防止裂纹的产生。
In order to find out the cause of unqualified 500 MPa steel flaw detection, the microstructure and composition of 500 MPa steel flaw detection were analyzed by optical microscope, scanning electron microscopy, energy dispersive spectroscopy and electron probe spectrometer. The results show that the reason of unqualified steel flaw detection is caused by the cracks on the center segregation zone of the steel plate. The inclusions of MnS and Nb / Ti are the main causes of the crack. By improving the cleanliness of molten steel, reducing the superheat of molten steel, optimizing the secondary cooling technology, using electromagnetic stirring and light pressure to improve the internal quality of the slab, while the slab heating process and post-stack stacking slow cooling mode to prevent cracked produce.