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1 580℃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60min;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。 Based on the theoretical analysis of thermodynamics and kinetics of increasing nitrogen in LF blown nitrogen alloying steel, the 80 t LF nitrogen infiltration alloying process was tested. Proposed a reasonable control of molten steel composition (S, O content), nitrogen flow, nitrogen blowing time and other process control measures. The results show that the precipitation of deoxidized 36 kg of aluminum wire per furnace before LF treatment is favorable for the rapid increase of molten steel. The higher the temperature of the molten steel is, the higher the temperature of molten steel is. Nitrogen alloyed molten steel temperature is generally above 1 580 ℃, the nitrogen absorption rate can be stabilized at more than 7 × 10 -6 / min; to meet the w (N) ≤ 200 × 10 -6 (-6) internal control requirements, LF The nitrogen blowing alloying time should not exceed 60min; steel tensile strength and yield strength increased significantly, the elongation after fracture decreased slightly, but to meet the national standard.