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某厂20G钢在生产初期,存在裂纹缺陷,低倍检验不合格,严重影响了20G钢的质量,使轧制合格率和成材率降低。为了解决20G钢裂纹问题,提高钢材质量,同时进一步提高技术水平,稳定产品质量,用热力学方法分析20G钢脱氧时可能析出的一次脱氧产物的平衡组成与钢液成分之间的关系,形成的脱氧产物主要是Al2O3和SiO2,并通过分析金属与夹杂物之间的平衡关系,计算钙处理夹杂物变性时钙、铝、氧、硫活度的变化,分析夹杂物的变性路径,为夹杂物的形成、夹杂物的形态控制或去除提供理论依据。
A factory 20G steel in the early production, there are defects in the cracks, low test failed, seriously affecting the quality of 20G steel, the rolling pass rate and yield rate lower. In order to solve the problem of 20G steel crack, improve the quality of steel, at the same time to further improve the technical level and stabilize the quality of products, thermodynamic analysis of 20G steel deoxidation may precipitate a balance between the composition of the deoxidation products and the composition of molten steel, the formation of deoxidation The products are mainly Al2O3 and SiO2. By analyzing the equilibrium relationship between metal and inclusions, the changes of calcium, aluminum, oxygen and sulfur activity during calcification of inclusions were calculated, and the denaturation paths of inclusions Formation, inclusions morphology control or removal provide a theoretical basis.