Abstract: The production process of steel 32Cr3MolV round bloom（/%:0.33～0.36C,0.20～0.50Mn,0.20～0.40Si,3.00～3.20Cr,0.30～0.45Ni,1.00～1.20Mo,0.19～0.22V,≤0.008P,≤0.005S,≤0.10Cu,≤0.01 Al）is 110 t EAF-LF-VD-Φ700mm round bloom CC. With control of EAF end [C]≥0.08%、[P]≤0.004%, LF end slag/% : 50~60CaO,10~15SiO₂,15 -25A1₂O₃, ≤6MgO,ΣFeO+MnO≤0.8% ,after VD [H] ≤1.3 x 10^-6,bloom whole CC process shield casting,casting speed 0.2 m/min,superheating temperature controlled in 18 〜30℃ ,using M-EMS, S-EMS, F-EMS etc technological measures, the Φ700 mm CC round bloom of 32Ci3Mo1V has been successfully produced. The results show that the surface quality of round bloom is fine with rating of center porosity 1.0, centerline shrinkage ≤1.5 , centerline crack≤ l. 5 ,and center defect size less than 100mm all to meet the requirements of standard.

Key words: Steel 32Cr3MolV, Casting Roll Shell Steel,Φ700 mm CC Round Bloom, 110t EAF-LF-VD-CC, Production Practice ,

摘要： 32Cr3Mo1V钢（/%:0.33～0.36C,0.20～0.50Mn,0.20～0.40Si,3.00～3.20Cr,0.30～0.45Ni,1.00～1.20Mo,0.19～0.22V,≤0.008P,≤0.005S,≤0.10Cu,≤0.01 Al）连铸圆坯生产工艺为110 t电弧炉-LF-VD-Φ700mm坯连铸。控制电弧炉出钢终点[C]≥0.08%、[P]≤0.004%,LF精炼终点渣（/%:50～60CaO,10～15Si0₂,15～25Al₂0₃,≤6MgO,ΣFeO+MnO≤0.8%,VD后[H]≤1.3×10^-6连铸全程保护浇铸,采用拉速0.2 m/min,过热度稳定控制在18～30℃使用结晶器、铸流、末端电磁搅拌等工艺措施成功生产Φ700mm 32Cr3Mo1V钢连铸圆坯。结果表明,连铸圆坯表面质量良好,中心疏松1.0级、缩孔≤1.5级、中心裂纹≤1.5级,中心缺陷大小低于100mm满足协议标准要求。

关键词: 32Cr3MolV钢, 铸轧辗套用钢, Φ700mm连铸圆坯, 110t EAF-LF-VD-CC, 生产实践