摘要
对高铝无磁钢20Mn23AIV(/%:0.14～0.20C、21.50～25.00Mn、1.50～2.50Al、0.04～0.10V)200 mm板坯连铸过程结晶器保护渣液渣和渣圈的化学组成、理化性能和结晶矿相进行了对比分析。保护渣原渣组成为(/%):31.91CaO、30.30SiO_2、6.58Al_2O_3、1.12MgO、3.02MnO、7.73Na20、7.10F。结果表明,连铸开浇后15 min,液渣和渣圈中的SiO_2含量分别降低至22%和18%,Al_2O_3含量分别提高至20.5%和25.5%,其碱度由原渣的1.05分别提高至1.7和2.0。此时液渣及渣圈的熔化温度和粘度大幅度增加,转折温度大幅度降低;渣圈的化学成分及理化性能的变化幅度均大于液渣。连铸开浇15 min后液渣及渣圈的成分与性能均趋于稳定。高熔点相钙铝黄长石的析出是促使渣圈形成的重要原因。
The chemical ingredient, physical-chemical properties and crystallized mineralogical phases of mold flux and slag rim for 200 mm slab of high aluminimn non-magnetic steel 20Mn23A1V （% ： 0. 14 -0. 20C, 21.50 ~ 25. OOMn, 1.50 -2. 50A1, 0. 04 -O. 10V） during concasting has been compared and analyzed. The ingredient of mold original flux is （/%） 31.91CaO, 30. 30SiO2 , 6. 58A1203 , 1. 12MgO, 3.02MnO, 7.73Na20, 7. 1OF. Results show that after starting casting in 15 min, the SiO2 content in mold flux and in slag rim respectively decreases to 22% and 18% , the A1203 content in that respectively increases to 20. 5% and 25.5% , and the basicity of that increases from 1.05 of original flux respective- ly to 1.7 and 2.0 ; this moment the melting temperature and viscosity of mold liquid flux and slag rim increase obviously while the break temperature decreases markedly; the change range of ingredient and physico-chemical properties of slag rim are all larger than that of mold liguid flux; and as casting for more than 15 rain, the ingredient and properties of mold liquid flux and slag rim tend to stability. The precipitation of high melting-point phase gehlenite is an important cause to form the slag rim in mold.
出处
《特殊钢》
北大核心
2013年第1期45-48,共4页
Special Steel
