ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2016, Vol. 37 ›› Issue (2): 32-35.

• 工艺技术 • 上一篇    下一篇

0.12%~0.16%C铬钼钢连铸板坯表面纵裂的控制

李杰1,3,郑京辉2,刘小军2,李双江1,张飞1   

  1. 1. 河北钢铁技术研究总院,石家庄 050000 ;
    2. 河北钢铁集团舞钢公司,舞钢 462500;
    3. 北京科技大学钢铁共性技术协同创新中心,北京 100083;
  • 收稿日期:2015-10-15 出版日期:2016-04-01 发布日期:2022-08-08
  • 作者简介:李杰(1983-),男,博士生,硕士(2010年东北大学),工程师,2008年东北大学(本科)毕业,连铸工艺及过程控制研 究。

Control of Casting Slab Surface Longitudinal Cracks of 0.12%-0.16% C Chromium Molybdenum Steel

Li Jie1,3 , Zheng Jinghui2 , Liu Xiaojun2 , Li Shuangjiang1 ,  Zhang Fei1   

  1. 1. Technology Research Institute, HBIS, Shijiazhuang 050000 ;
    2. Wugang Co, HBIS, Wugang 462500;
    3. Collaborative Innovation Center of Steel Technology, University of Science and Technology, Beijing 100083;
  • Received:2015-10-15 Published:2016-04-01 Online:2022-08-08

摘要: 12Cr2Mo,14CrMo和15CrMo钢的生产流程为铁水-110t BOF—LF—VD-300 mm×(1700~2400)mm板坯CC工艺。分析了钢中碳含量,Mn/S,结晶器倒锥度,结晶器冷却工艺和保护渣,浸入式水口插入深度等因素对连铸板坯表面纵裂的影响。通过将优化前3种钢的结晶器倒锥度1.10优化成12Cr2Mo钢1.20,14CrMo钢1.15,15CrMo钢1.10,浸入式水口的插入深度由原先的170~180 mm调整到140~150 mm,使用粘度较低的保护渣(碱度1.25,1300℃粘度0.129 Pa·s),以增加渣液的流动性,连铸板坯表面纵裂缺陷得到了有效的控制,纵裂率由原先的8.9%降低到优化后的3.2%。

关键词: 0.12%~0.16%C铬钼钢, 300 mm连铸板坯, 表面纵裂, 保护渣, 结晶器倒锥度, 浸入式水口, 工艺优化

Abstract: The Production flowsheet for steel 12Cr2Mo, 14CrMo and 15CrMo is metal-110t BOF-LF-VD-300 mm x (1700-2400) mm slab CC process. The effect of factors including carbon content in steel, Mn/S, mold inverted taper and immersion nozzle insertion depth on casting slab longitudinal cracks is analyzed. By optimizing the mold inverted taper from before optimization 1.10 for three kinds of steel to 1.20 for steel 12Cr2Mo, 1.15 for steel 14CrMo and 1.10 for steel 15CrMo, adjusting the immersion nozzle insertion depth from original 170-180 mm to 140-150 mm, and using lower viscosity mold powder (basicity 1.25, viscosity 0.129 at 1300℃) to increase the flux flowability, the casting slab surface longitudinal cracks defect is effectively controlled, the longitudinal cracks occurred rate decreases from original 8.9% to 3.2% after optimization.

Key words: 0.12%-0.16% C Chromium Molybdenum Steel, 300 mm Casting Slab, Surface Longitudinal Cracks, Mold Powder, Mold Inverted Taper, Immersion Nozzle