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研究了低碳硼钢连铸坯表面和角部凹坑和裂纹的形成原因。对样品进行了金相组织观察、扫描电子显微镜(能谱分析)、Gleeble-3800热模拟试验、THERMO-CALC软件计算和X射线衍射分析,结果表明,连铸坯表面凹坑缺陷与结晶器保护渣性能有关,表面和角部裂纹是由于二冷矫直区铸坯温度位于该钢种的脆性温度区间以及钢水中BN的析出所致。通过降低钢水含氮量、适当提高热矫温度和调整结晶器保护渣性能等工艺措施,明显减少了低碳硼钢表面缺陷。
The reasons for the formation of pits and cracks on the surface and corner of low carbon boron steel continuous casting slab were studied. The samples were observed by metallography, scanning electron microscopy (EDS), Gleeble-3800 thermal simulation, THERMO-CALC software and X-ray diffraction analysis. The results show that the surface of the slab defects and mold protection Slag performance, the surface and corner cracks are due to the second cold straightening zone slab temperature lies in the brittle temperature range of the steel and the precipitation of BN in molten steel. By reducing the nitrogen content of molten steel, appropriately increasing the hot-rolled temperature and adjusting the properties of the mold powder, the surface defects of the low-carbon boron steel are obviously reduced.