连铸坯内部裂纹产生原因及解决措施

Causes of Internal Cracks in Continuous Casting Billet and Solutions

摘要: 连铸坯在生产过程中因为钢水质量和工艺问题会不可避免的产生内部裂纹。当其在后续轧制中由于轧制方法等等原因，可能无法焊合从而保留在轧制成品中，进而影响产品品质，严重者造成安全事故。本文综述了钢水中钢水过热度和硫含量、锰含量、磷含量等化学成分对连铸坯内部裂纹出现的影响；同时，详细总结了拉速、保护渣、二冷工艺等连铸工艺对内部裂纹生成和扩展的影响。与此同时，对前人防止内部裂纹产生、扩展的预防措施进行总结，通过实施相应措施降低连铸坯内部裂纹产生量。其对实际生产中连铸坯内部裂纹出现原因进行总结，并采取相应措施予以防止，解决连铸坯内部质量问题，对类似的炼钢生产具有一定的指导和借鉴意义。

Abstract: Internal cracks are inevitable in continuous casting billets due to the quality and process problems of molten steel. When it is in the subsequent rolling process, due to rolling methods and other reasons, it may not be welded together so as to retain in the rolling products, thereby affecting product quality, and serious internal cracks can cause safety accidents. In this paper, the influence of superheat, sulfur, manganese and phosphorus content of molten steel on the internal crack of continuous casting billet is reviewed; the influences of drawing speed, protective slag, secondary cooling process and other continuous casting processes on the formation and propagation of in-ternal cracks are summarized in detail. At the same time, the preventive measures to prevent the generation and expansion of internal cracks were summarized, and the corresponding measures were implemented to reduce the production of internal cracks in continuous casting billets. It sum-marizes the causes of internal cracks of continuous casting billet in actual production, and takes corresponding measures to prevent them. To solve the internal quality problem of continuous casting billet has certain guidance and reference significance for similar steelmaking production.