150t LF精炼喂钙线处理钢中夹杂物的演变  

Evolution of Inclusions in Steel with 150 t LF Refining Feeding Calcium Wire Treatment

作　　者：姜玉龙[1,2] 郑万[1,2] 齐盼盼[1,2] 李天佑[1,2] 王春锋[3] 刘炳宇[3] 李光强[1,2] 

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉430081 [3]武汉钢铁股份有限公司,武汉430083

出　　处：《特殊钢》2016年第3期8-12,共5页Special Steel

基　　金：国家自然科学基金资助(No.51541409)

摘　　要：通过热力学计算和扫描电镜研究了铁水预处理-150 t BOF-钢包吹氩-LF-CSP流程LF精炼后喂硅钙线和钙铝线处理的Q235,SPA-H和DC01钢中夹杂物演变及精炼渣对其影响。结果表明,Ca处理前的精炼过程中,钢中Al_O_3大部分已经被精炼渣（/%：52.97~55.63CaO,4.11~12.78SiO_2,5.11~9.87MgO,22.93~31.72Al_2O_3,0.58~1.27FeO,0.01~0.07MnO）改性为MgO·Al_2O_3,根据Mg-Al-O生成优势区图,钢中有微量Mg就能使Al_2O_3变性为MgO·Al_2O_3尖晶石,钙处理主要是对MgO·Al_2O_3尖晶石的变性,因此需要保证充足的钙线喂入量,才能将高熔点铝镁和铝镁钙复合夹杂物变性到低熔点区域;为了避免生成高熔点CaS夹杂物,钙处理前[Al]=0.02%~0.04%时,[S]要小于0.001 4%。The evolution of inclusions in steel Q235, SPA-H and DC01 treated by feeding silicon-calcium wire and calcium-aluminium wire after LF refining in metal pretreatment-150 t BOF-ladle argon blowing-LF-CSP flowsheet and the effect of refining slag on inclusions are studied by thermodynamic calculation and scanning electron microscope. The results show that during refining process before Ca treatment the greater part of A12 O3 in steel is modified to MgO · A12 03 by refi- ning slag （/% ： 52.97 - 55.63Ca0, 4. 11 - 12.78Si02, 5.11 ~ 9.87MgO, 22.93 - 31.72Al203 , 0. 58 - 1.27FeO, 0. 01 -0. 07MnO） ; based on the Mg-AI-O predominant forming diagram, with miero-amount Mg in steel the AlzO3 may modify to MgO ~ A1203 spinel, the calcium treatment is mainly to modify the MgO ~ A1203 spinel, therefore it is need to feeding sufficient amount of calcium for high melting point aluminium-magnesium and aluminium-magnesium-ealeium inclu- sion modifying to low melting point region; in order to avoid forming high melting point CaS inclusions, before calcium treatment with [ AI] =0. 02% ~0. 04% the [ S] should be less than 0. 001 4%.

关 键 词：钙处理 Q235 DC01 SPA-H钢 夹杂物 CSP 水口堵塞 精炼渣 

分 类 号：TF769.2[冶金工程—钢铁冶金]