EAF-LF-CC工艺冶炼的结构钢低倍夹杂物的分析和控制  

Analysis and Control of Macro Inclusion in Structural Steel Melting by EAF-LF-CC Process

作　　者：李冬生[1] 徐冠宇[1] 

机构地区：[1]武钢集团鄂钢公司质检中心,鄂州436002

出　　处：《特殊钢》2007年第1期59-60,共2页Special Steel

摘　　要：分析了鄂钢70tEAF—LF—CC流程生产的20MnTiB钢和45钢低倍夹杂物的成分以及结晶器保护渣和连铸工艺耐火材料的组成，得出钢的低倍夹杂主要是由Al2O3、MgO、CaO、Na2O、SiO2组成的复合夹杂物。通过改进工艺：白渣精炼时间≥10min，控制Als／Al1≥85％，喂Ca-Si线后软吹氩≥7min，控制钢包水口插入深度≥200mm，浸入式水口插入深度80～130mm，采用优质耐火材料等措施，使低倍夹杂物检验合格率由90．96％～95．31％提高到99．77％～100％。The composition of macro inclusion in 2.0MnTiB steel and 45 steel melting by 70 t EAF-LF-CC flow sheet at F.gang and ingredient of mold powder and refractory material for concasting process have been analyzed, and it is obtained that the macro inclusion of steel is a composite inclusion which mainly consists of A1203, MsO, CaO, Na2O and SiO2. With improving technology measures including white refining time 310 min, controlling Als/Al1 ≥85%, after feeding Ca-Si wire soft argon stirring time ≥7 min, controlling immersion depth of ladle nozzle ≥200 mm and immersion depth of immersion nozzle 80 - 130 mm, and using quality refractory materials, the qualified steel rate for macro inclusion examination increased to 99. 77% - 100% from original 90. 96% -95.31%.

关 键 词：EAF—LF—CC 低倍组织 夹杂物工艺控制 

分 类 号：TF777[冶金工程—钢铁冶金]