Research on Cleanliness of 27SiMn Steel Produced by BOF-LF-CC Process
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摘要: a通过对国内某钢厂BOF-LF-CC工艺生产的27SiMn管坯钢的洁净度进行全流程系统取样、综合分析，结果表明：经过LF精炼后，钢中显微夹杂物的数量由35.0个/mm2降到8.4个/mm2，中间包处理过程中全氧和夹杂物含量都有明显上升，铸坯中T[O]含量基本稳定在（24~30）×10-6，铸坯大型夹杂物为0.487 mg/kg。针对现有生产工艺中影响铸坯洁净度的主要因素：中间包烧氧开浇及不稳定浇注造成的二次氧化及结晶器卷渣等，提出相应的工艺改进措施。Abstract: The cleanliness of 27SiMn tube billet produced by BOF-LF-CC process in a domestic steel mill is studied by the way of sampling systematically and comprehensive analysis.The results show that the quantity of microinclusions decreases from 35.0 to 8.4 per square millimeter after LF.The quantity of total oxygen and inclusions contents increases obviously in tundish.The average total oxygen content is(24~30)×10-6 in round billet, and macroinclusion in it is 0.487 mg/kg.The main factors affecting the steel cleanliness are revealed based on research results, such as reoxidation caused by burning oxygen and pouring unstably and slag entrapment in mold.Then some measures of improvement process are proposed pointedly.
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Key words:
- 27SiMn /
- continuously cast billet /
- cleanliness /
- inclusion /
- reoxidation
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