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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。
The non-metallic inclusions in SPHC steel were studied by metallographic observation, scanning electron microscopy, electron probe and large-scale electrolysis. The results show that the average number of inclusions in the unit area of the tundish to the billet is (TO) = (28-33) × 10-6, w (N) = (30-43) × 10-6 8.979 3 to 7.344 2 / mm2, and the proportion of inclusions in the tundish and slab inclusions less than 10μm were all 93%. Large inclusions per 10 kg in the tundish were 6.8 mg. Under normal production conditions , Large inclusions in slab decreased to 5.9 mg; large inclusions increased sharply to 12.3 mg and inclusions of 100-280 μm reached 26.32% in the event of entrapment; inclusions in the tundish were mainly deoxidation products and deoxidation Formed composite inclusions, mainly in the slab composite inclusions, large inclusions in the tundish and slab are mainly aluminous silicate inclusions and silicates, and found that Mg, K and other elements, indicating that the middle The lining is eroded and the slag entrainment occurs in the mold.