LF吹氮合金化工艺试验

›› 2016, Vol. 32 ›› Issue (1): 42-46.

LF吹氮合金化工艺试验

刘晓峰¹,黄志强²

1. 重庆钢铁股份有限公司二炼钢厂
2. 重庆钢铁股份有限公司二炼钢厂

收稿日期:2015-08-04 修回日期:2015-09-02 接受日期:1900-01-01 出版日期:2016-02-05 发布日期:2016-02-29
通讯作者: 刘晓峰 E-mail:liuxiaofeng831205@163.com

Blowing nitrogen alloying process test of LF

1. Chongqing Iron and Steel Co., Steel Plan
2.

Received:2015-08-04 Revised:2015-09-02 Accepted:1900-01-01 Online:2016-02-05 Published:2016-02-29

摘要/Abstract

摘要： 在理论分析LF吹氮合金化钢水增氮热力学和动力学的基础上，进行了重钢80 t LF吹氮合金化工艺试验。提出了合理控制钢水成分（S、O含量）、氮气流量、吹氮时间等工艺控制措施。试验结果表明：LF处理前每炉钢水喂36 kg铝线沉淀脱氧有利于实现钢水快速增氮；大流量吹氮气前钢水温度越高，钢水增氮效果越明显，吸氮速率越快，LF吹氮合金化钢水温度一般在1580 ℃以上，可以将吸氮速率稳定在7×10^-6/min以上；为满足w（N）≤200×10^-6内控要求，LF全程吹氮气合金化时间不宜超过60 min；钢材抗拉强度和屈服强度大幅提高，断后伸长率略有下降，但满足国家标准。

关键词: LF，氮气，合金化，试验。

Abstract: The process test of nitrogen alloying by 80t LF gas injection was made in CISC based on theoretical analysis of thermodynamics and dynamics. The technological measures of reasonable control on steel composition (sulfur, oxygen content), nitrogen flow and nitrogen blowing time were proposed. The results showed that，the treatment of feeding 36kg aluminium wire per heat before LF for precipitation deoxidation was conducive to nitrogen content increasing quickly. The higher the molten steel temperature was before large blowing, the better the nitrogen absorption effect was. The nitrogen absorption rate was stabled over 7×10^-6/min when molten steel temperature was over 1580 ℃. In order to satisfy w（N）≤200×10^-6, the time of nitrogen alloying by LF gas injection should not exceed 60 min. The yield strength and tensile strength of steel were increased, and the elongation was decreased slightly, but all of these met the national standard.

Key words: Ladle furnace，Nitrogen，Alloying，Test.

刘晓峰黄志强. LF吹氮合金化工艺试验[J]. , 2016, 32(1): 42-46.