Production process of low-cost clean steel for wide and heavy plate
LI Chao1, LI Jian-xin1, LIU Zhan-li1, ZHANG Fei1, JIANG Jing-yu2, LI Jie1,3
1. Technology Research Institute, HBIS Group Co. , Ltd. , Shijiazhuang 050023, Hebei, China; 2. Wusteel, HBIS Group Co. , Ltd. , Wugang 462500, Henan, China; 3. School of Metallurgical and Ecological Engineering, University of Science and and Technology Beijing, Beijing 100083, China
Abstract:In order to further improve the cleanliness of steel plate and reduce production cost,the production process of low-cost clean steel with LF-VD refining for the wide and heavy plate was studied by theoretical calculation and industrial tests. In the VD refining process, SiO2 in the refining slag reacted with Al in the steel, reducing the mass percent of SiO2 and increasing the mass percent of Al2O3 in the slag. By optimizing the converter and refining deoxidization and alloying system, the mass percent of SiO2 in the refined slag and the mass percent of Al in the steel before VD were reduced, and the reaction of slag-steel in VD process was weakened. Aluminum loss in the VD process was reduced by 29%. Not only did the aluminum consumption of per ton steel decrease by 0.68 kg, but also the cleanliness of the steel plate increased significantly. The mass percent of total oxygen and nitrogen were decreased by 0.000 6%, and the number density of inclusions which more than 2 μm and more than 5 μm in the steel plate were decreased by 74% and 81% respectively.
李超, 李建新, 刘占礼, 张飞, 姜静宇, 李杰. 宽厚板低成本洁净钢生产工艺[J]. 钢铁, 2020, 55(9): 38-42.
LI Chao, LI Jian-xin, LIU Zhan-li, ZHANG Fei, JIANG Jing-yu, LI Jie. Production process of low-cost clean steel for wide and heavy plate[J]. Iron and Steel, 2020, 55(9): 38-42.
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