超低碳超低硫钢控硫工艺研究

Study of controlling-sulfur technique in ultra low-carbon ultra low-sulfur steel

介绍了首钢股份公司迁安钢铁公司在冶炼超低碳超低硫钢过程中工艺、操作等方面的经验,并试验对比低硫钢和超低硫钢对硫含量的控制,得出了硫含量的控制工艺路线,成品w(S)≤0.003 5%的过程能力指数由0.85提高至1.13。通过铁水预处理、转炉主副原料控制、生产计划优化、出钢渣洗、RH脱硫等措施可将低硫钢种90%板坯成品w(S)控制在0.003%以内,与低硫钢种RH工序前均采取相同工艺的前提下,不同的是在RH合金化后,加入脱硫剂将钢液w(S)从0.002 6%降低至0.001 4%,最终超低硫钢成品w(S)全部控制在0.002%以内。

Some experience of the process and operation on refining ultra-low carbon ul- tra low sulfur steel were introduced. Through the comparison of low sulfur and ultra low sulfur steel production, control routing of sulfur content was obtained,and process capability index of w（S）≤0. 003 5 % in slab was increased from 0.85 to 1.13. By pre- treatment of hot metal, material quality control, production plan optimization, desulfura- tion in RH, heats produced by ordinary process, the sulfur mass fraction within 0. 003 % proportion can reach more than 90% in slab. Heats produced by desulfuration process, the sulfur content within 0. 002% proportion can reach 100% in slab. The control of sulfur element ability received a significant improvement.