低铁耗下钢中氮含量的研究与控制  

STUDY AND CONTROL OF NITROGEN CONTENT IN STEEL WITH LOW IRON CONSUMPTION

作　　者：王杰文 武献民 毕军建 张羽 杨帅 Wang Jiewen;Wu Xianmin;Bi Junjian;Zhang Yu;Yang Shuai(Steelmaking Plate of Delong Iron and Steel Co., Ltd., Xingtai, Hebei, 054009)

机构地区：[1]德龙钢铁有限公司炼钢厂

出　　处：《河北冶金》2019年第10期54-57,共4页Hebei Metallurgy

摘　　要：对钢中氮含量的变化趋势及其影响因素进行了研究分析。结果表明,转炉终点N含量偏高是导致钢中N量升高的主要原因,且相较有精炼工序的炉次,无精炼工序的出钢过程增N量偏高;入炉铁水比、废钢及焦炭加入量、转炉底吹工艺及终点碳含量控制等均是导致钢中氮含量升高的主要因素。通过以硅碳球替代部分或全部焦炭,采用部分铁块搭配废钢使用的原料结构,调整氮氩切换时间、后搅气量及后搅时间,控制转炉终点碳含量及脱氧合金加入顺序等措施,实现了钢中氮含量控制在50ppm以内,铸坯角裂率大大降低,产品质量得到有效提升。The changing trend and influencing factors of nitrogen content in steel were studied and analyzed. The results show that the high N content at end-point converter is the main reason for the increasing of N content in steel, and the N content in tapping process without refining process is higher than that with refining process. The main factors leading to the increasing of N content in steel are molten iron ratio, scrap and coke addition, bottom blowing process of converter and control of end-point carbon content. By replacing partial or all coke with silicon-carbon sphere, adopting the raw material structure of part iron block with scrap steel, adjusting nitrogen-argon switching time, post-stirring volume and post-stirring time, controlling end-point carbon content of converter and addition sequence of deoxidizing alloy, etc., the nitrogen content in steel is controlled within 50 ppm, and the angular crack rate of slab is greatly reduced. Moreover, The quality of products has been effectively improved.

关 键 词：低铁耗 氮含量 废钢 焦炭 底吹工艺 终点碳含量 

分 类 号：TF713[冶金工程—钢铁冶金]