Slab continuous casting by big roll heavy reduction and extra thick plate rolled by low compression ratio
KANG Yong-lin1, ZHU Guo-ming1, JIANG Min1, WANG Guo-lian2, LIU Peng-tao3, XU Hai-wei2, XIE Cui-hong2, WEI Yun-fei2, SHEN Kai-zhao2, LIU Yang4
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2.Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China; 3.Beijing Shougang International Engineering Technology Co., Ltd., Beijing 100043, China; 4. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100041, China
Abstract：In recent years, the heavy reduction technology at solidification end of continuous casting developed at home and abroad has achieved good effect on reducing porosity and segregation in thick slab, while there are also some deficiencies, for instance, when the thick slab is pressed by the small rolls of segment, the strain is difficult to penetrate into the core of slab, which is not conducive to ameliorate the central porosity. Obtaining high-quality thick slab with high efficiency, low cost as well as low energy consumption and rolling high-quality thick slab with low compression ratio are still the direction of further exploration and development. In order to solve the problems of central porosity and segregation defects in the solidification process of thick slab continuous casting more effectively, a new technical of wide-thick slab continuous casting by big roll heavy reduction(BRHR) was proposed and the BRHR equipment was developed. The BRHR equipment had been installed, commissioned on the wide and thick slab continuous casting line and operated for more than two years. Meanwhile, the process prediction and control system and secondary cooling water process optimization control technology were developed. The research proves that developed BRHR equipment and technology for continuous casting are conducive to make the reduction strain penetrate into the core of slab. Using the large gradient temperature field which is larger than 500 ℃ or 400 ℃ formed at the end of solidification or just complete solidification (fs=1.0) on the continuous casting line to implement large diameter roll for large reduction can significantly reduce the central defects of wide and thick slab. The production practice proves that shrinkage, porosity and segregation in 400 mm thickness specification wide and thick continuous casting slab have been significantly ameliorated by BRHR equipment and technology. Combined with the optimization of rolling process, the high-quality extra thick slab with thickness of 150-200 mm is produced with very low compression ratio of 1.90-2.53, which has great significance for low cost and short process production of high-quality extra thick products as well as energy conservation and emission reduction.
康永林, 朱国明, 姜敏, 王国连, 刘彭涛, 徐海卫,谢翠红, 魏运飞, 沈开照, 刘洋. 板坯连铸大辊径大压下及低压缩比轧制特厚板[J]. 钢铁, 2022, 57(7): 95-105.
KANG Yong-lin, ZHU Guo-ming, JIANG Min, WANG Guo-lian, LIU Peng-tao, XU Hai-wei, XIE Cui-hong, WEI Yun-fei, SHEN Kai-zhao, LIU Yang. Slab continuous casting by big roll heavy reduction and extra thick plate rolled by low compression ratio[J]. Iron and Steel, 2022, 57(7): 95-105.
[1] 刘艳,曹建宁,耿明山,等. 大型扁锭水冷制造技术[J]. 钢铁, 2014, 49(8), 35. (LIU Yan, CAO Jian-ning, GENG Ming-shan, et al. Technology for large rectangular ingot production with intensive water cooling[J]. Iron and Steel, 2014, 49(8), 35.) [2] 刘金泉. 复合连铸坯叠轧生产特厚Q345R钢板工艺的开发与应用[J]. 宽厚板, 2016, 22(1), 23. (LIU Jin-quan. Development and application of composite slab pack rolling process for extra heavy steel plate Q345R[J]. Wide and Heavy Plate, 2016, 22(1), 23.) [3] Sei Hiraki, Akihiro Yamanaka, Yoshihisa Shirai, et al. Development of new continuous casting technology (PCCS) for very thick plate[J]. Materia Japan, 2009, 48(1), 20. [4] Chang-Hee Yim, Y-M Won, Joong-Kil Park, et al. Continuous Cast Slab and Method for Manufacturing the Same: US, 2010/ 0296960[P]. [2010-11-25] [5] Chang-Hee Yim, Jeong-Do Seo. Advanced steelmaking technologies for CO2 emission reduction and slab quality improvement[C]//The 5th International Congress on the Science and Technology of Steelmaking (ICS 2012). Dresden: [s.n.], 2012:1. [6] 朱苗勇. 新一代高效连铸技术发展思考[J]. 钢铁,2019, 54(8), 21. (ZHU Miao-yong. Some considerations for new generation of high-efficiency continuous casting technology development[J]. Iron and Steel, 2019, 54(8), 21.) [7] 康永林, 唐荻. 轧钢过程节能减排先进技术[M]. 北京:冶金工业出版社, 2020. (KANG Yong-lin, TANG Di. Advanced Technology of Energy Saving and Emission Reduction for Steel Rolling[M]. Beijing: Metallurgical Industry Press,2020.) [8] 赵沛, 董鹏莉. 碳排放是中国钢铁业未来不容忽视的问题[J]. 钢铁, 2018, 53(8): 1. (ZHAO Pei,DONG Peng-li. Carbon emission cannot be ignored in future of Chinese steel industry[J]. Iron and Steel, 2018, 53(8): 1.) [9] 李海军, 李睿昊, 宫美娜, 等. 热芯大压下轧制连铸坯再加热时的组织遗传性[J]. 钢铁, 2020, 55(11): 140. (LI Hai-jun, LI Rui-hao, GONG Mei-na, et al. Microstructure inheritance of continuous casting steel deformed by hot-core heavy reduction rolling technology during reheating process[J]. Iron and Steel, 2020, 55(11): 140.) [10] 刘东升, 程丙贵, 罗咪,等. 特厚EH47止裂钢板及焊接热影响区的组织性能[J]. 钢铁, 2021, 56(3): 92. (LIU Dong-sheng, CHENG Bing-gui, LUO Mi, et al. Microstructures and mechanical properties in ultra-thick EH47 steel plates and heat affected zones[J]. Iron and Steel, 2021, 56(3): 92.) [11] 康永林, 王新华, 朱国明, 等. 连铸坯凝固末端大压下的连铸机扇形段及其大压下方法:中国,ZL201410325414.1[P]. [2016-6-15]. (KANG Yong-lin, WANG Xin-hua, ZHU Guo-ming, et al. Sector Shaped Section Continuous Casting Machine for Heavy Reduction and Corresponding Heavy Reduction Method: China, ZL201410325414.1[P].[2016-6-15]. [12] KANG Yong-lin, WANG Xin-hua, ZHU Guo-ming, et al. Sector Shaped Section Continuous Casting Machine for Heavy Reduction and Corresponding Heavy Reduction Method: JAPAN, 2017-No.6541043[P]. [2014-9-25]. [13] KANG Yong-lin, WANG Xin-hua, ZHU Guo-ming, et al. Sector Shaped Section Continuous Casting Machine for Heavy Reduction and Corresponding Heavy Reduction Method: Europe, EP3167974[P]. [2014-9-25]. [14] 毛敬华, 帅勇, 谢贵强, 等. 连铸特厚板坯内部质量控制的关键技术[J]. 钢铁, 2019, 54(8),64. (MAO Jing-hua, SHUAI Yong, XIE Gui-qiang, et.al. Key technology of internal quality control for continuous casting extra-thick slab[J]. Iron and Steel, 2019, 54(8),64.) [15] 邓小旋, 潘宏伟, 季晨曦, 等. 常规低碳钢板坯的高速连铸工艺技术[J]. 钢铁, 2019, 54(8), 70. (DENG Xiao-xuan, PAN Hong-wei, JI Chen-xi, et al. Review on high speed conventional slab continuous casting of low carbon steels[J]. Iron and Steel, 2019, 54(8), 70.) [16] 杨恩蛟, 姜敏, 侯泽旺, 等. 连铸板坯凝固末端大压下改善铸坯内部质量[J]. 中国冶金, 2020, 30(5): 23. (YANG En-jiao, JIANG Min, HOU Ze-wang, et al. Improvement of internal quality for continuous casting slab by heavy reduction at solidification endpoint[J]. China Metallurgy, 2020, 30(5): 23.) [17] 蔡开科, 程士富. 连续铸钢原理与工艺[M]. 北京:冶金工业出版社, 1994. (CAI Kai-ke, CHENG Shi-fu. Continuous Casting Theory and Process[M]. Beijing: Metallurgical Industry Press,1994.) [18] XU Z G, WANG X H, JIANG M. Investigation on improvement of center porosity with heavy reduction in continuously cast thick slabs[J]. Steel Research International, 2017, 88(2): 231. [19] 吴晨辉, 李阳, 谢鑫, 等. 板坯连铸过程凝固传热数值计算与工艺优化[J]. 中国冶金, 2022, 32(3), 92. (WU Chen-hui, LI Yang, XIE Xin, et al. Numerical calculation on solidification heat transfer process and optimization of slab continuous casting process[J]. China Metallurgy, 2022, 32(3): 92.) [20] 陈登福, 徐佩, 龙木军, 等. 钢液连铸二次冷却先进工艺模型的发展与研究[J]. 钢铁, 2020, 55(3), 40. (CHEN Deng-fu, XU Pei, LONG Mu-jun, et al. Development and investigation of advanced process model for secondary cooling in continuous casting of molten steel[J]. Iron and Steel, 2020, 55(3), 40.)
2022, Vol. 57 
