9Ni钢纯净化生产实践

介绍了鞍钢9Ni钢的工艺路线和技术特点。采用转炉双联法、LF/VD双渣法及精炼合成渣技术可使钢中有害元素P+S+N+H+O总和平均降低到0.008 4%;采用电磁搅拌、动态二冷和多点矫直技术减少了连铸坯内部和表面缺陷;采用温度为200~300℃的铸坯缓冷和铸坯修磨工艺保证了轧后钢板表面质量。

Operation Practice for Purification of 9Ni Molten Steel

The technological process and characteristics for smelting the 9Ni molten steel in Angang are described. The total content of harmful elements in 9Ni molten steel including P, S, N, H and O is reduced to 0.008 4% after adopting converter duplex steelmaking technique, LF/VD duplex slag technique and synthetic slag technology during refining. For continuous casting, inter-nal defects and on surface defects of continuous casting slabs are reduced by using electric mag-netic stirring technology, dynamic secondary cooling technology and multi -point straightening technology. And at last the surface quality of the steel plate after rolled is guaranteed by using slow slab-cooling technology in the cooling temperature range from 200 ℃ to 300 ℃ and slab grinding technology.