CSP工艺生产SPHC钢洁净度研究  

Study on cleanliness of SPHC steel by CSP process

作　　者：彭其春[1] 邹健[1] 童志博[1] 刘炳宇[2] 李具中[2] 陈忠良[2] 

机构地区：[1]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,湖北武汉430081 [2]武汉钢铁集团公司,湖北武汉430080

出　　处：《炼钢》2012年第5期74-77,共4页Steelmaking

摘　　要：用金相观察、扫描电镜、电子探针和大样电解等对SPHC钢中非金属夹杂物进行研究。结果表明:铸坯中w(T.O)=(28～33)×10-6、w(N)=(30～43)×10-6;中间包到铸坯单位面积内夹杂物平均个数由8.979 3降低到7.344 2个/mm2,中间包钢液及铸坯夹杂物粒径小于10μm的比例均为93%;中间包钢液中每10 kg中大型夹杂物为6.8 mg;正常生产情况下,铸坯中大型夹杂物减少到5.9 mg;发生卷渣时,大型夹杂物大幅上升,达到12.3 mg,且100～280μm的夹杂物达到26.32%;中间包中夹杂物主要为脱氧产物以及脱氧后形成的复合夹杂物,铸坯中主要为复合夹杂物,中间包和铸坯中大型夹杂物主要为硅铝酸盐类复合夹杂物和硅酸盐类,并发现Mg、K等元素,说明中间包衬被侵蚀、结晶器发生卷渣现象。By the methods of metallographic observation, EPMA, and sample-electroly- zing, the morphologies and composition of nonmetallic inclusions in SPHC steel are in- vestigated. The results show that w（T. O） and w（N） in slab are （28~33） x 10 -6 and （30-43） x ll）-6 separately. The average number of inclusions decreases form 8. 979 3 mm-2 to 7. 344 2 mm-2 , the proportion of less than 10 μm inclusions is 93 %. Under the normal conditions the macro-inclusion content of 10 kg liquid steel in tundish is 6. 8 and 5.9 mg in slab. However as soon as slag entrapment occurs large inclusions will in- crease rapidly and they may reach as high as 12.3 mg and the 100-280 μm inclusions come up to 26.32 %. The inclusions in the tundish are mainly composed of deoxidized products and deoxidized compound inclusions; the inclusions in the slab mainly consist of compound inclusions; inclusions in the tundish and slab are mainly silicon aluminate compound inclusions and silicate inclusions and magnesium and potassium are also found in the inclusions. It shows that the lining of the tundish is already eroded and slag en- trapment occurs in the mold as well.

关 键 词：洁净度 CSP 大样电解 非金属夹杂物 

分 类 号：TF777.7[冶金工程—钢铁冶金]