Q235钢2步脱氧工艺的理论分析及生产试验

炼钢 ›› 2015, Vol. 31 ›› Issue (2): 26-29.

Q235钢2步脱氧工艺的理论分析及生产试验

耿涛

（1.江苏省沙钢钢铁研究院，江苏张家港 215625； 2.沙钢集团有限公司宏发炼钢厂，江苏张家港 215625）

收稿日期:2014-05-27 修回日期:2014-07-02 接受日期:1900-01-01 出版日期:2015-04-05 发布日期:2015-04-23
通讯作者: 耿涛 E-mail:gengling9@163.com

Theoretical analysis and pilot production of two stepdeoxidization process for Q235 steel

Received:2014-05-27 Revised:2014-07-02 Accepted:1900-01-01 Online:2015-04-05 Published:2015-04-23

摘要/Abstract

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180 t 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。

关键词: 硅铝镇静钢, 转炉出钢, 2步脱氧, LF精炼

Abstract: Based on the thermodynamic calculation of complex deoxidization with Al-Si-Mn, a two-step deoxidization process was proposed for Q235 steel. The first deoxidization 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 steelslag system was calculated by the thermodynamic software Thermo-Calc. The results 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)×10-6 in 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.

Key words: Si-Al killed steel, BOF tapping, two-step deoxidization process, LF refining

耿涛1，邹长东1，赵家七1，绍荣耀2. Q235钢2步脱氧工艺的理论分析及生产试验[J]. 炼钢, 2015, 31(2): 26-29.

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