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Effect of different charging methods on slab heating Steelmaking    2021, 37 (4): 65-73.   Abstract （69）            Knowledge map    Save In order to study the temperature field and heat change of slab in furnace heating process under different charging methods, and to explore the energy saving advantages of hot transport and hot charging rolling, a two-dimensional heat transfer model of slab in furnace heating under cold charging, warm charging and hot charging was established by using finite element method based on the hot delivery and hot charging production line of a steel plant, and the correctness of the model was verified by field temperature measurement. The results show that during the heating process, the temperature distribution of cold charging billets is similar to that of warm charging billets with the highest corner temperature and the lowest core temperature distribution, while the hot charging billets have a process of gradually transferring the low temperature region from the corner to the core. The higher the charging temperature is, the greater the proportion of influence on the heating process. The heat content of hot charging billets before charging is 16.48 times of that of cold charging billets. The heat absorbed by hot charging billets is only 38.22 % of that of cold charging billets and 52.30 % of that of warm charging billets. Related Articles | Metrics

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Research on non-metallic inclusions in the process of semi-smelting Ti-IF steel Steelmaking    2021, 37 (4): 49-57.   Abstract （67）            Knowledge map    Save The non-metallic inclusions in Ti-IF steel smelted by semi-steel was studied by thermal test to improve the cleanliness of molten steel and reduce the size of inclusions for process optimization. The research shows that the inclusions are spherical FeO-MnO in LF inlet, the main inclusions are wrapped and clustered MgO-FeO-MnO-Al2O3 in LF outlet. The main inclusions are mainly spherical, spindle-shaped and irregular FeO-Al2O3 after RH decarburization, and are mainly triangular, quasi-spherical and clustered Al2O3 after RH aluminum deoxidation for 3 minutes. After Ti alloying for 3 minutes, the main shapes of inclusions are hexagonal TiO2-Al2O3, spindle-shaped and almost diamond-shaped Al2O3. After leaving the RH station，the inclusions are spherical TiO2-Al2O3, spindle-shaped and nearly diamond-shaped Al2O3 inclusions. The inclusions in the slab are mainly diamond-shaped TiN, quasi-spherical Al2O3 and irregular-shaped Al2O3-TiN. The non-metallic inclusions in the original process that affect the surface quality of Ti-IF steel and the purity of molten steel are mainly large-sized Al2O3 (≥15μm). By optimizing the oxygen lance nozzle, RH process parameters and tundish flow field, the T.O mass fraction in slab is reduced to 16.3×10-6, the maximum non-metallic inclusion size is reduced to 9.5 μm. So the cleanliness of Ti-IF molten steel is significantly improved. Related Articles | Metrics

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Parameter analysis and design of steel-slag air quenching process based on CFD Steelmaking    2021, 37 (4): 74-80.   Abstract （94）            Knowledge map    Save In view of the influence of many factors such as wind speed and granulation chamber layout, the two processes of the steel-slag air quenching process including liquid steel-slag being impacted by high-speed airflow and liquid steel-slag particles convective cooling and solidification were discussed，and the mathematical model of steel-slag air quenching and the multiphase flow equation considering turbulent shear stress transfer was established. Based on the finite element analysis method and substituting the physical parameters of the actual steel-slag sample, a finite element model of the air quenching process was established. Finally, through the numerical simulation of the liquid steel-slag air quenching process, the heat exchange and solidification laws of the steel-slag particles under different particle sizes and wind speeds were obtained, and the parameters of the granulation chamber process layout were verified. Numerical simulation results considering the latent heat of phase change of steel-slag and air resistance during solidification show that if the wind speed of the incident airflow is 100 m/s, the surface layer of slag particles less than or equal to 3 mm can be solidified within 3 s, and the slag particles mainly fall within the range of 20-35 m, which meets the process conditions of the granulation chamber. Related Articles | Metrics

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Production practice of rapid reduction of bottom height in 65 t top-bottom combined blowing converter Steelmaking    2021, 37 (4): 1-4.   Abstract （120）            Knowledge map    Save In view of the problem of bottom height rising of 65 t top and bottom combined blown converter in Masteel, the causes were analyzed and some solutions were proposed. Production practice showed that,by using the reaction of molten iron and oxygen,the height of converter bottom could be reduced rapidly by controlling the lance position, oxygen accumulation and erosion time. The splash rate decreased from 0.63 % to 0.31 % due to blowing difficulty caused by converter bottom exceeding upper limit, and ferrous charges consumption was reduced by 4.16 kg/t, which provided a strong guarantee for converter steelmaking production safety. Related Articles | Metrics

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Experiment on high efficient conditioning treatment of ladle slag in production of ULC automobile sheet steels Steelmaking    2021, 37 (4): 5-9.   Abstract （81）            Knowledge map    Save In the ladle slag conditioning treatment after BOF tapping in production of automobile sheet steel, measures must be taken to prevent the reaction between the high [O] content liquid steel and the top slag in addition to add enough amount of conditioning agent. Otherwise, the mass fraction of FetO in the slag will rise back to 8 %-14 %, or even higher, though it can be lowered to low content level temporally in conditioning treatment. The technology developed by Hanbao Steelmaking Plant of Hansteel Co., Ltd. to restrain the slag-steel reaction in ladle slag conditioning treatment is introduced in this article, which are 1) using aluminum-slag pellets as the slag conditioning agent which can slowly release Al in and after the conditioning treatment, 2) adding lime after BOF tapping instead of during tapping, 3) increasing ratio of w(CaO)/w(Al2O3) of the ladle slag to lower its fluidity,and 4) using week bottom stirring. With the developed technology, TFe mass fraction of the ladle slags before and after RH refining is lowered to less than 3 % and 5 %, respectively. Re-oxidation of the molten steel due to the ladle slag has been controlled. Contents of the total oxygen and non-metallic inclusions of the liquid steel in CC tundish are reduced and nozzle clogging in continuous casting has been effectively controlled. Related Articles | Metrics

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High casting speed production practice of hypo-peritectic steel slab Steelmaking    2021, 37 (4): 25-29.   Abstract （82）            Knowledge map    Save In order to solve the problem of period matching of hypo-peritectic steel casting between BOF and CC, improve production efficiency, the stable production of high casting speed of hypoperitectic steel was realized by optimizing mold cooling, oscillation mode and mold powder. After optimization, the cooling water velocity of mould increased from 7.27 m/s to 8.45 m/s, the negative time of mold oscillation mode was controlled from 0.112-0.128 s to 0.151 s， the basicity of mold powder increased from 1.28 to 1.29, the viscosity of 1 300 ℃ decreased from 0.13 Pa·s to 0.12 Pa·s. The maximum casting speed reached 1.6 m/min，the incidence of longitudinal cracks on the surface of slab was less than 0.3 % and the quality of central segregation was stable. Related Articles | Metrics

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Research on manganese oxidation in the process of converter steelmaking Steelmaking    2021, 37 (3): 1-9.   Abstract （195）            Knowledge map    Save Related Articles | Metrics

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Cause analysis and control of edge crack of Q345 hot rolled plate produced by CSP Steelmaking    2021, 37 (5): 60-66.   Abstract （64）            Knowledge map    Save Related Articles | Metrics

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Mechanism and improvement of erosion of stopper rod during continuous casting process of highstrength lowalloy steel after calcium treatment Steelmaking    2021, 37 (3): 44-50.   Abstract （136）            Knowledge map    Save Related Articles | Metrics

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Dynamic roll gap control technology based on force prediction model in segment Steelmaking    2021, 37 (5): 35-40.   Abstract （98）            Knowledge map    Save Related Articles | Metrics

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Effect of Al2O3 content in refining slag on non-metallic inclusions in Al-killed steel Steelmaking    2023, 39 (2): 18-23.   Abstract （94）      PDF（pc） （6317KB）（141）       Knowledge map    Save In order to study the influence of Al2O3 content in medium-basicity refining slag on steel cleanness and inclusions, the equilibrium experiment between CaO-SiO2-Al2O3-MgO top slag with initial basicity of 4 and different Al2O3 content and Al-killed steel was carried out by MgO crucible at 1 873 K. The results show that after slag-steel reaction, the inclusion type changes from MgO-Al2O3-MnS to complex centered with MgO-Al2O3 and surrounded by MgO-Al2O3-SiO2-CaO(-MnO) system. The shape changes from block and cluster shape with angular boundary to near-spherical shape with smooth boundary. With the increase of Al2O3 content in slag, Al2O3 content in inclusions increases significantly, MgO content decreases, and other components have little change. The inclusion size tends to increase. The number density of inclusions increases which indicates that the cleanliness of steel deteriorates. Under present experimental conditions, when the Al2O3 mass fracton is about 20 %, the number density of inclusions is the lowest, and the steel cleanliness is the best. Based on the experimental results, thermodynamic analysis was done to discuss the composition change of slag and steel as well as the transformation of inclusions. Related Articles | Metrics

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Research and practice on channel-type induction heating tundish of Jingye Steel Steelmaking    2021, 37 (5): 41-45.   Abstract （86）            Knowledge map    Save Related Articles | Metrics

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Distribution of inclusions in unsteady slab of thin slab caster Steelmaking    2021, 37 (5): 67-75.   Abstract （65）            Knowledge map    Save Related Articles | Metrics

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Effect of immersion depth of submerged entry nozzle on slag entrapment in slab continuous casting Steelmaking    2021, 37 (5): 22-28.   Abstract （102）            Knowledge map    Save Related Articles | Metrics

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Analysis and control method of slag crusting for LF deep desulfurization refining Steelmaking    2021, 37 (3): 39-43.   Abstract （88）            Knowledge map    Save Related Articles | Metrics

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Effect of selective crystallization on slab surface cracks during continuous casting of peritectic steel Steelmaking    2021, 37 (3): 58-61.   Abstract （118）            Knowledge map    Save Related Articles | Metrics

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Industrial test of highintensity bottom blowing CO2 in 120 t combined blowing converter Steelmaking    2021, 37 (3): 10-16.   Abstract （75）            Knowledge map    Save Related Articles | Metrics

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Research on characteristics，evolution and control of entrapped mold flux defects in high speed continuous casting Steelmaking    2021, 37 (4): 30-37.   Abstract （194）            Knowledge map    Save High speed continuous casting，continuous casting and rolling process with high efficiency，energy saving and low cost advantages have been rapidly popularized and applied，but encountered development bottleneck due to an increasing frequency of mold flux entrapment in high speed continuous casting and entrapped mold flux defects in rolled products. In this paper, the formation mechanism of mold flux entrapment and its main influence factors were analysed，and characteristics of slag entrapment defect in the slab，hot rolled products and cold rolled products，and their evolution law were briefly described. Finally the control measures of mold flux entrapment in high-speed continuous casting were reviewed. In view of the shortage of existing measures to adapt to the development of high-speed continuous casting，the key development directions are put forward，such as electromagnetic control of the flow field in mold，intelligent control of mold liquid level and development of high-performance mold flux，which can provide reference for promoting the highquality development of high efficiency continuous casting，continuous casting and rolling process. Related Articles | Metrics

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Study on solidification structure and segregation of continuous casting slab of Hi-B steel Steelmaking    2021, 37 (5): 29-34.   Abstract （106）            Knowledge map    Save Related Articles | Metrics

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Effect of adding scrap into torpedo on hot metal slag and desulphurization Steelmaking    2021, 37 (5): 1-5.   Abstract （103）            Knowledge map    Save Related Articles | Metrics