炼钢 ›› 2019, Vol. 35 ›› Issue (2): 51-56.

• 产品工艺与质量控制 • 上一篇    下一篇

影响加磷高强超低碳钢可浇性的因素研究

李波1,2,朱立光1,韩毅华1,马德刚2,李梦英3,张卫卫4   

  1. (1.华北理工大学 冶金与能源学院,河北 唐山 063009 2.河钢股份有限公司唐山分公司 汽车板事业部研发中心,河北 唐山 063000 3. 河钢股份有限公司唐山分公司 技术中心,河北 唐山 063000 4. 河钢股份有限公司唐山分公司 不锈钢公司,河北 唐山 063000)
  • 接受日期:1900-01-01 出版日期:2019-04-05

Study on influence of factors on castability of ultra-low-carbon P-added high-strength steel

  • Accepted:1900-01-01 Online:2019-04-05

摘要: 加磷高强超低碳钢具有IF钢特性,特点是添加一定含量的P、Mn、Nb等合金元素以达到固溶强化的目的,提高钢种强度而又不影响钢种塑性,但高磷钢水易引起水口絮瘤堵塞。通过研究钢中氧化物夹杂(Al2O3为主)的生成与去除这一直接关键影响因素,分析内在机理,进行相关的理论研究和生产试验,通过工艺流程的优化、转炉终点高温高磷成分控制、RH精炼微合金化工艺优化及全流程时间匹配,减少了钢中夹杂物的生成、促进了夹杂物的聚集上浮去除等,改善钢水可浇性。RH出站钢水平均T.O质量分数2510-6,连铸中包钢水平均T.O质量分数1910-6,最终解决加磷高强超低碳钢可浇性问题,实现100 t LD→RH→CC工艺流程的大批量稳定生产,单支水口稳定5炉连浇。

关键词: 加磷超低碳高强钢, 可浇铸性, 夹杂物, 生产流程, 工艺优化

Abstract: Ultra-low-carbon P-added high-strength steel has IF steel characteristics and is characterized by adding a certain amount of alloying elements such as P, Mn and Nb to achieve solid solution strengthening and increasing the strength of the steel without affecting the plasticity of the steel, but the high P content of molten steel is likely to cause nozzle clogging. By investigating the direct key influence factors of the formation and removal of oxide inclusions (Al2O3 mainly) in steel, analyzing the internal mechanism, conducts relevant theoretical research and production test, optimizing the selection by process, controlling the high temperature and high P content of molten steel at converter end-point, optimizing RH refining microalloying process and full process time matching, reducing the formation of inclusions in steel, and promoting the accumulation of inclusions, the castability of molten steel was improved. The average value of T.O mass fraction leaving RH station is 2510-6, and the average value of T.O mass fraction in continuous casting tundish is 1910-6. Finally, the problem of castability of P-added high-strength ultra-low carbon steel has been solved, and large-scale stable production with100t LD→RH→CC process flow and stable 4 furnace sequence continuous casting have been realized.

Key words: P-added ultra low carbon high-strengt castability h steel, castability, inclusion, production process flow, process optimization