Research on Cleanliness of IF Steel During Casting Process
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摘要: 系统研究了IF钢浇铸过程的纯净度,通过对RH-中间包-铸坯T[O]和[N]研究表明:中间包至铸坯,T[O]平均含量由31×10-6降至20×10-6,[N]平均含量则由16.5×10-6增加至19.6×10-6。对一浇次前三炉中间包钢液夹杂物分析表明:随开浇进行小于2μm夹杂物总数显著减低,总数减小在50%以上。对头尾坯和正常坯的表层夹杂物原位分析表明:头坯的Al系夹杂物含量明显高于正常坯和尾坯,内外弧表面不同深度Al系夹杂物含量分布趋势一致,距离表层1.6 mm处时,Al系夹杂物的含量最低,超过1.6 mm时,Al系夹杂物含量上升,超过3.2mm后夹杂物含量下降。Abstract: Cleanliness of IF steel during casting process was systematically investigated. The research on T[O]in RH-tundish-slab shows that from tundish to slab,average contents of T[O]decrease from 31× 10-6 to 20 × 10-6while average contents of nitrogen increase from 16.5 × 10-6 to 19.6 × 10-6. The analysis on inclusions in tundish for the first three heats of a casting batch shows that the number of inclusions with diameters smaller than 2 μm reduces significantly to no more than 50 percent of the initial amount. Original position analysis(OPA) on surface inclusions in head slab,tail slab and normal slab shows that the content of Al series inclusions in head slab is apparently higher than those in normal slab and tail slab; the distribution tendency of Al series inclusions in different depth in inner arc is consistent with that in outer arc; where the distance to the surface is 1.6 mm,the content of Al series inclusions the lowest; where the distance to the surface is above 1.6 mm,the content increases while the distance above 3.2 mm,the content tends to decrease.
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Key words:
- IF steel /
- cleanliness /
- original position analysis /
- inclusion
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