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针对某炼钢厂高碳钢类小方坯出现的形状紊乱、不规则振痕问题,通过对高碳钢表面振痕特征的观察,结合金相显微镜对典型缺陷位置纵断面腐蚀形貌的分析,探讨了铸坯异常振痕的形成过程。分析认为,铸坯与结晶器间润滑不良、摩擦阻力过大是导致高碳钢连铸坯表面出现振痕弯曲、外凸甚至铸坯表面搭结的主要原因。实践表明,通过将结晶器振动的振动频率及振幅分别降至180次/min、4.2~4.5mm,保护渣的黏度及熔化温度调整为0.18Pa·s、1 030℃,优化改善后,保护渣的消耗量从原来的0.18kg/t增加到0.31kg/t。最终,高碳钢的表面质量有了明显的改善,铸坯振痕平整、有规则,轧材结疤返废率由3%~4%降至1%以内,具有良好的应用效果。
Aiming at the disorder of shape and irregular vibration mark of the high carbon steel billets in a steelmaking plant, the characteristics of the vibration marks on the surface of the high carbon steel were analyzed. The corrosion profiles of the typical defects were analyzed by metallographic microscope , Discussed the forming process of abnormal oscillation mark of slab. Analysis shows that poor lubrication between the slab and the mold, frictional resistance is too large is caused by the appearance of high carbon steel slab surface bending bending, convex or even slab surface of the main reason. Practice shows that by changing the vibration frequency and amplitude of the mold vibration to 180 times / min, 4.2 ~ 4.5mm, the viscosity and melting temperature of the mold flux is adjusted to 0.18Pa · s, 1030 ℃, after optimization and improvement, the mold flux Consumption increased from 0.18kg / t to 0.31kg / t. Finally, the surface quality of high-carbon steel has been significantly improved, slab vibration marks flat, regular rules, scarring of rolled rolled back to the rate of 3% to 4% down to 1%, with good application results.