摘要
通过热力学计算分析了430铁素体不锈钢钙处理后在生成液态夹杂物区间内钢中钙质量分数和铝质量分数的关系,并对430铁素体不锈钢未采用钙处理和采用钙处理板坯中夹杂物类型、数量进行了对比,分析了钙处理夹杂物变性过程。结果表明,精炼过程喂入硅钙线可以得到理想的钙处理效果。钙处理后430钢水中高熔点的Al_2O_3和低变性的CaO-SiO_2-Al_2O_3-MgO夹杂物得到良好变性,夹杂物数量比未采用钙处理时明显减少,夹杂物尺寸都小于15μm。CaO和Al_2O_3两者通过发生化学反应变性为低熔点的液态夹杂物。
The relationships between the calcium mass fraction and the aluminum mass fraction in liquid inclusion region in steel after calcium treatment for 430 ferritic stainless steel was analyzed by the thermodynamic calculation.The inclusion types and number in 430 stainless steel without and with calcium treatment were compared,and the modification mechanism of inclusions was analyzed.The results showed that when calcium silicon line was added during LF,the ideal calcium treatment effect can be obtained.The Al2O3 and CaO-SiO2-Al2O3-MgO inclusion can be modified into inclusions which were liquid at steelmaking temperature after calcium treatment.The inclusion size was less than 15 μm,and the inclusion number was decreased obviously compared with the number without calcium treatment.The CaO and Al2O3 reacted with each other and finally formed liquid calcium aluminates.
出处
《中国冶金》
CAS
2017年第10期15-18,75,共5页
China Metallurgy
关键词
430铁素体不锈钢
钙处理
夹杂物
变性
430 ferritic stainless steel
calcium treatment
inclusion
modification
