120t转炉生产42CrMoA合结钢水口结瘤分析及改善措施  

Analysis and Improvement Measures for Nodulation of Nozzle about Production of 42CrMoA Alloy Steel Melted by 120t BOF

作　　者：丰年 Feng Nian(The Special Steel Division of Laiwu Branch,Shandong Iron and Steel Group Corporation,Laiwu 271104)

机构地区：[1]山东钢铁股份有限公司莱芜分公司特钢事业部,莱芜271104

出　　处：《特殊钢》2018年第5期36-39,共4页Special Steel

摘　　要：分析了120 t转炉生产42CrMoA合结钢(/%:0.28～0.45C,0.17-0.37Si,0.50～0.80Mn,≤0.020P,≤0.020S,0.90～1.20Cr,0.15～0.25Mo,Cu≤0.20,Ni≤0.30,0.015～0.035Al)塞棒和浸入式水口结瘤原因。分析表明塞棒结瘤物的主要为Al_2O_3和高熔点的CaO·2Al_2O_3类钙铝酸盐,浸入式水口结瘤物主要为Al_2O_3夹杂物聚集。通过控制转炉终点碳在0.18%～0.28%、转炉出钢钢水溶解氧含量<200×10^(-6)、调整精炼终点钙铝参数(0.020%～0.030%Al;0.001 5%～0.003 0%Ca)、连铸保护浇铸工艺实施等措施,解决了转炉生产42CrMoA合结钢塞棒和水口结瘤问题。Abstract The reasons for the slug nodulation of 42CrMoA alloy steel （/% ：0. 28 - 0.45C ,0. 17 ~ 0. 37Si ,0. 50 - 0. 80Mn, ≤0.020P, ≤0.020S,0.90 - 1.20Cr,0. 15 -0. 25Mo, Cu≤0. 20, Ni≤0. 30, 0. 015 -0. 035A1） melted by 120 t BOF and the submerged nozzle were analyzed. The results showed that the main nodule nodules were A12 03 and CaO - 2A1203 aluminates with high melting point. By controlling the end point carbon of converter in 0. 18% to 0. 28%, the dis- solved oxygen content of the molten steel in converter is less than 200 x 10-6, the parameters of calcium aluminum （0. 020% -0. 030% A1; 0.001 5% - 0.003 0% Ca） at the end point of refining, and the casting technology of continuous casting, are imolemented, the nodulation of 42CrMoA Junction steel stonner and the nozzle of the converter is solved.

关 键 词：42CrMoA 塞棒结瘤 120T转炉 浸入式水口结瘤 钙铝参数 

分 类 号：TF713[冶金工程—钢铁冶金]