摘要
针对LF精炼钢氮含量偏高的问题,对冶炼各工序进行了取样分析,发现LF精炼造渣阶段为主要的增氮环节。通过实际取样检测和热力学分析,证实造渣阶段的增氮主要是由铝灰中的Al N引起的。使用Al2O3含量较高、氮含量较低的人工合成渣替代铝灰,使铝灰的使用量由2.6 kg/t降低至0.6 kg/t,通过对一个浇次7炉试验钢的LF出站氮含量进行检测,平均氮质量分数由改进前的76×10-6下降到44×10-6,在不影响精炼效果的同时抑制了原辅料引起的钢液增氮。
In order to solve the problem of excessive nitrogen content in liquid steel in LF refining process, each process of smelting was analyzed. The results showed that the initial slagging stage of LF refining was the mainly process for nitrogen content increasing. Through the sampling analysis and thermodynamic analysis, it was confirmed that the increasing of nitrogen content in molten steel was mainly caused by the A1N in the aluminum dross. The synthetic slag with high A12 03 and low nitrogen content was used instead of aluminum dross, and the usage of aluminum dross was reduced from 2.6 kg/t to 0.6 kg/t, the nitrogen mass fraction decreased from 76 × 10^-6 to 44 × 10-6 at the endpoint of LF refining in a cast of seven furnaces. It is drawn that the synthetic slag reduces the nitrogen content in liquid steel caused by raw materials without affecting the refining effect.
出处
《炼钢》
CAS
北大核心
2015年第1期52-55,共4页
Steelmaking
