20G钢氧化物夹杂控制及钙处理热力学研究

Research on 20G Steel Oxide Inclusion Control and Calcium Treatment via Thermodynamics Method

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。

During the early stage of producing grade 20G steel,crack defects and macro- structure defects were frequently observed which were expected to decrease rolling qualified rate and yield. In order to solve the crack problem and to improve steel product quality,a thermodynamics method was used to determinate the relationship between equilibrium composition of possible first deoxidizing product and liquid steel compostion in the processes of first deoxidation where Al2O3and SiO2dominate. Then activity changes of calcium,aluminum,oxygenium and sulphur had been calculated inclusion modification path had been determinated during calcium treatment which can provides theoretical basis for inclusion formation,modification and removal.