摘要
通过工厂试验研究了X70管线钢冶炼过程中钢包顶渣成分、软搅拌的氩气流量以及浇铸温度对铸坯洁净度的影响；应用超声波C-Scan探测铸坯中的大型夹杂物（100μm以上）；并用扫描电镜对铸坯中夹杂物的成分进行了分析。试验结果表明：当氩气流量为15m^3／h左右时，软搅拌能有效地去除钢水中的小型夹杂物；当钢包顶渣的氧化性降低且w（CaO）／w（Al2O3）控制在1．8左右，软搅拌的氩气流量从30m^3／h降至15m^3／h，浇铸温度适度升高时，铸坯中的大型夹杂物指数明显降低。电镜扫描结果显示，铸坯中夹杂物主要为CaO·xAl2O3＋CaS，其心部为铝酸钙（大部分夹杂物w（CaO）／w（A1203）=0．75～1．10），外面裹有一层硫化钙。
The present paper investigated the effect of ladle top slag composition, argon flow-rate of soft stirring and casting temperature on the cleanliness of slabs through plant-scale experiments during X70 pipeline steel production; ultra-sonic C-Scan method was used to detect the macro inclusions （≥100μm） in the slabs; inclusion compositions and morphology were analyzed using SEM/EDS. The experimental results show that the micro inclusions could be removed efficiently by soft stirring when the argon flow rate is controlled at around 15 m^3/h,and when the oxygen potential of ladle top slag decreases and w（CaO）/w（Al2O3） is controlled within the limit of about 1.8 and the argon flow rate of the soft stirring is lowered to 15 m^3/h from 30 m^3/h as well as the casting temperature of the slab properly rises, the index of the large inclusions in the slab goes down obviously. Results of the SEM/EDS show that the inclusions in the slab mainly consist of CaO. xAl2 03 ＋ CaS, in which the core portion is calcium aluminates （most w（CaO）/w（Al2O3 ） are in the range of 0. 75-1.10） wrapped with a layer of calcium sulfide.
出处
《炼钢》
CAS
北大核心
2011年第4期33-36,共4页
Steelmaking
