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针对太钢采用连铸工艺并使用低碱度保护渣生产高锰钢20Mn23AlV铸坯表面存在的微裂纹问题,通过现场取样、渣-金反应等试验,结合金相显微镜、扫描电镜和能谱分析等手段系统研究了表面裂纹的特征和形成过程,在此基础上研究了现有低碱度保护渣在使用前后的成分变化、熔点、黏度和传热等指标的变化情况。结果表明,生产过程中低碱度保护渣中的SiO_2被钢液中的铝还原,导致液态渣成分发生变化,从而影响了坯壳与结晶器铜板之间的润滑和传热等性能,导致了高锰钢20Mn23AlV铸坯表面微裂纹缺陷。连铸生产钢液中含有强还原性元素(铝)时,应采用低SiO_2质量分数的连铸保护渣,以减少高锰钢连铸坯表面微裂纹的产生,提高铸坯表面质量,实现高锰钢连铸生产顺行。
In order to solve the problem of micro-cracks existing on the surface of 20Mn23AlV cast slabs of high manganese steel produced by continuous casting process using low basicity mold flux and adopting the continuous sampling process and slag-gold reaction test, metallurgical microscope, scanning electron microscope and energy spectrum analysis And other means to systematically study the characteristics and formation process of surface cracks. On the basis of this, the changes of composition, melting point, viscosity and heat transfer of the existing low basicity mold fluxes before and after use were studied. The results show that during the process of production, the SiO_2 in the low basicity slag is reduced by aluminum in the molten steel, causing the composition of the liquid slag to change, which affects the lubrication and heat transfer between the shell and the mold copper plate, Surface Cracks in 20Mn23AlV Cast Steel with High Manganese Steel. In the continuous casting process, molten steel containing strong reducing elements (aluminum) should be made of continuous casting powder with low SiO 2 mass fraction to reduce the generation of micro-cracks on the surface of the high manganese steel slab and improve the surface quality of the slab, achieving high Manganese steel continuous casting production line.