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 Al₂O₃ and CaO·2Al₂O₃  aluminates with high melting point. By controlling the end point carbon of converter in 0. 18% to 0. 28% , the dissolved oxygen content of the molten steel in converter is less than 200 x 10^-6, the parameters of calcium aluminum (0.020% ~0.030% Al； 0.001 5% ~0.003 0% Ca) at the end point of refining, and the casting technology of continuous casting are implemented, the nodulation of 42CrMoA junction steel stopper and the nozzle of the converter is solved.

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Al₂O₃和高熔点的CaO·2Al₂O₃类钙铝酸盐,浸入式水口结瘤物主要为Al₂O₃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。