马钢第四钢轧总厂300t转炉IF钢生产实践.doc

马钢第四钢轧总厂300t转炉IF钢生产实践201104马钢第四钢轧总厂300t转炉IF钢生产实践
杨明1,熊磊2,邓勇 3
(,北京10008;,马鞍山,243000)
摘要:本文针对马钢四钢轧总厂(以下简称四钢轧)300吨转炉初期生产IF钢存在的问题,对IF钢的在转炉终点控制的关键参数上进行了优化。转炉终点碳含量要求控制在300~650ppm;转炉冶炼终点钢水中的氧是产生钢中夹杂物的根源,对钢的洁净度有着不利的影响,为了加强转炉终点氧含量的控制水平,提高产品的内部质量,通过对四钢轧某阶段转炉冶炼IF钢现场试验研究,分析了转炉终点氧含量的分布状态,研究了碳含量、炉龄、终点温度等因素对终点氧含量的影响规律,要求终点活度氧含量控制在500~850ppm。通过以上措施提高了转炉工序的控制能力,为下道工序提供了冶炼的有利条件,稳定了IF钢的生产,提高了钢水质量。
关键字:IF钢;转炉;终点碳;终点氧
Productive Practice of IF Steel in Fourth Steelmaking and Steel Rolling General Works of Masteel
Yang Ming1, Xiong Lei 2, Deng Yong 3)
( Iron & Stell Research Institute, Beijing, 10008;2. Manshan Iron & pany Limited,Maansh,243000)
Abstract: The process of IF steel were optimized against the initial problems of production in fourth steelmaking and steel rolling general works of Masteel. The carbon content is controlled between 300 to 650×10-6 at converter end-point. Oxygen activity at blowing end-point of BOF steelmaking is the main source of producing nonmetallic inclusions and has bad influence on steel order to increase the control of oxygen content at blowing end-point of BOF steelmaking and improve products inner quality,experiments are done during a BOF steelmaking to produce IF steel in Fourth Steelmaking and Steel Rolling General Works of Masteel .The content of carbon and oxygen at blowing end-point is analyzed,the effect of content of carbon,BOF age,
end-point temperature on the content of oxygen at blowing and end-point are studied, and the oxygen content is between 500×10-6 and 800%×10-6 at converter end-point is put forward. The processes control ability of BOF was improved, the production of IF steel was stabilized, and the steel quality was improve because of these.
Key Words:IF steel ;BOF ;end-point oxygen content;end-point carbon content
1 前言
80年代以来,随着冶金生产技术的进步和汽车工业的发展,IF钢得到迅速发展。1997年仅日本IF钢的年产量就超过1000万t。以IF钢为基础发展起来的深冲热镀锌IF钢板、深冲高强度IF钢板、深冲高强度烘烤硬化(BH)IF钢板等系列,已形成了第三代汽车冲压用钢。IF钢的生产已经成为一个国家汽车用钢板的标志。降低生产成本并开发物美价廉的品种是目前IF钢研究和生产的