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针对CSP生产过程中SS400钢板产生的表面纵向裂纹进行研究与分析。结果表明:钢板表面纵向裂纹大部分分布在钢板宽度方向的两个1/4区域内,裂纹的长度一般为0.5~2.0 m,深度为0.1~0.2 mm,宽度均小于1 mm。其裂纹沟内均含有由Na、Mg、Al、Si、Cl、K、Ca等元素组成的复合夹杂物相,而在裂纹的内部有氧化铁夹杂物。进一步分析认为,该种表面缺陷产生于连铸结晶器内,在随后二冷区的强冷和加热炉的加热过程中,裂纹得到了进一步的扩展。通过对结晶器传热的控制和二冷水的调整,板坯的纵裂得到了控制。
Aiming at the longitudinal cracks on the surface of SS400 steel produced in CSP production process, The results show that most of the longitudinal cracks on the surface of steel plate are distributed in two 1/4 zone in the width direction of the steel plate. The crack length is generally 0.5-2.0 m, the depth is 0.1-0.2 mm and the width is less than 1 mm. The cracks in the cracks are composed of Na, Mg, Al, Si, Cl, K, Ca and other elements composed of composite inclusions, and cracks in the interior with iron oxide inclusions. Further analysis showed that the surface defects occurred in the continuous casting mold, and the cracks were further expanded in the subsequent strong cooling in the second cooling zone and heating in the heating furnace. Through the control of the mold heat transfer and the adjustment of the second cold water, the longitudinal cracking of the slab is controlled.