针对重轨钢铸坯的角部缺陷、探伤不合、中心疏松和偏析问题,分析出其影响原因并采取了以下措施:改变保护渣的成分和性能,使用四孔浸入式水口,将典型拉速下的二冷比水量由大于0.3L/kg降至0.2L/kg左右,同时延长了轻压下位置。最终使得铸坯质量大幅提升,中心疏松I级合格率达99.5%,探伤合格率稳定在99.5%以上,角部缺陷消除。 Aiming at the defects of corner defects, flaw detection, center looseness and segregation in heavy rail steel slabs, the causes were analyzed and the following measures were taken: The composition and properties of mold fluxes were changed. Using four-hole immersion nozzle, Under the second cold than water from 0.3L / kg down to 0.2L / kg or so, while extending the soft position. In the end, the quality of billet was greatly improved, the center was loose and the qualified rate of grade I was 99.5%. The passing rate of flaw detection was stable at 99.5% and corner defects were eliminated.