摘要
为实现Q235钢种节能降本的目的，分析了该钢种原工艺的冶炼特点，通过铝、硅、锰复合脱氧的热力学计算，提出了“转炉出钢加硅、锰和少量铝弱脱氧＋LF补铝终脱氧”的2步脱氧工艺。经Thermo-Calc热力学软件计算整个体系的平衡状态，精炼结束钢水中的氧含量（w（O）：1×10^-6）和硫含量（w（S）=1．5×10^-6）均达到钢种要求，理论上验证了新工艺的可行。经180t LF试生产，精炼结束钢水w（Alt）=0．004％～0．015％，w（T．O）=（20~35）×10^-6，w（S）〈0．012％，满足工艺要求，钢水浇铸性能良好，脱氧成本可降低4．2元／t。
Based on the thermodynamic calculation of complex deoxidization with Al-Si- Mn, a two-step deoxidization process was proposed for Q235 steel. The first deoxidiza- tion step was carried out during BOF tapping, with suitable amounts of silicon, manganese and small amounts of aluminum; and the final deoxidization step was carried out during LF refining with aluminum wire feeding. The equilibrium state of the liquid steebslag system was calculated by the thermodynamic software Thermo-Calc. The re- sults show that the dissolved oxygen mass fraction of the molten steel is 1 ×10^-6 and the sulfur mass fraction of the molten steel is 1.5 ×10^-6 at LF end. The experiment results show that when the total aluminum mass fraction is 0. 004% ~0. 015%, the total oxygen mass fraction is （20 - 35） ×10^-6in steel and the sulfur mass fraction is less 0. 012 % in steel at the end of LF refining, and the cost of deoxidized alloys can save 4. 2 yuan/t.
出处
《炼钢》
CAS
北大核心
2015年第2期26-29,35,共5页
Steelmaking
关键词
硅铝镇静钢
转炉出钢
2步脱氧
LF精炼
Si-Al killed steel
BOF tapping
two step deoxidization process
LF refining
作者简介
耿涛（1978-），女，江苏省沙钢钢铁研究院，硕士，从事钢水精炼的研究。
