超低氧含量弹簧钢中非金属夹杂物的控制  

Control of non-metal inclusion in ultra-low oxygen spring steel

作　　者：李海波[1] 王新华[1] 张玮[2] 杨卫中[2] 周德光[2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]首都钢铁集团公司技术研究院,北京100041

出　　处：《炼钢》2008年第5期19-22,共4页Steelmaking

摘　　要：为了减小夹杂物对Al脱氧弹簧钢的危害,通过钢渣之间、钢液和夹杂物之间的反应尽快使脱氧产物Al2O3夹杂变性为低熔点的铝酸钙夹杂。炉渣w(CaO)/w(MgO)高,夹杂物更容易转变为铝酸钙夹杂物,炉渣w(CaO)/w(MgO)大于8时,在LF精炼中期,夹杂物已经由MgO.Al2O3尖晶石向铝酸钙转变;炉渣的氧化性延缓了夹杂物向铝酸钙的转变;钢液S、Al含量低,夹杂物更容易控制在低熔点区域内。随着钢液T.O的降低,夹杂物中氧化物夹杂占的比例逐渐减少,CaS夹杂占的比例逐渐增加。To make the non-metal inclusion less harmful for aluminum killed steel the deoxidized products Al2O3 inclusions should be transformed to low melting point calciumaluminate inclusions through reactions between steel and slag as well as steel and inclusion. The following points have to be made clear： firstly if the （CaO/MgO） ratio of the slag is large the inclusions in the hot metal are very easily transformed into the Al2O3 inclusions） the second one in the medium stage of LF refining when （CaO/MgO） ratio of the slag is larger than 8 the inclusions are promptly transformed into calcium-aluminate from MgO-Al2O3, the third one, the oxidation of slag （FeO ＋ MnO） can delay the transformation of inclusions into the calcium-aluminate; and the fourth the inclusions can easily be controlled in the low melting area of the CaO-Al2 O3-CaS ternary phase diagram only if [Al%] and [S%] are controlled in a very small margin） and the last,along with the reduction of the total oxygen in steel the proportion of oxide inclusions reduces and CaS proportion increases.

关 键 词：弹簧钢 夹杂物 MgO·Al2O3 铝酸钙 

分 类 号：TF762.5[冶金工程—钢铁冶金]