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Effect of oxygen content on liquid steel cleanliness after RH decarburization of IF steel Steelmaking    2023, 39 (2): 24-27.   Abstract （62）      PDF（pc） （5408KB）（126）       Knowledge map    Save Taking IF steel as the research object, combined with the production practice of 300 t RH furnace of Shougang Jingtang company, the oxygen content at the end of RH decarburization and the size and quantity of inclusions after deoxidation in the smelting process of IF steel were studied by means of production intensive sampling, data statistics, inclusion scanning electron microscope and other analysis methods. It was found that when the oxygen mass fraction after  RH decarburization was controlled at (290-310)×10-6, the Al2O3 inclusions produced in molten steel were the least. Based on this, the control method of oxygen content at the end of RH decarburization was studied. It was found that the hit rate of oxygen content at the end of decarburization in the forced decarburization mode was high and controllable, and the oxidation of top slag in the forced decarburization mode was weaker than that in the natural decarburization mode, which could reduce the formation of Al2O3 inclusions caused by secondary oxidation. The oxygen blowing calculation model was studied and established to ensure accurate control the oxygen content at the end of decarburization, which could improve the cleanliness of molten steel. Related Articles | Metrics

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Causes analysis and control measures of longitudinal cracks on the surface of continuous casting round billet Steelmaking    Accepted: 01 January 1900

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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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Plasticity control of oxide inclusions in low spattering gas shielded welding wire steel ER70S-6 Steelmaking    Accepted: 01 January 1900

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Effect of basicity on physicochemical properties and phosphorus migration of refined slag Steelmaking    2022, 38 (3): 20-25.   Abstract （192）            Knowledge map    Save Related Articles | Metrics

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Research on numerical simulation optimization of special-shaped tundish Steelmaking    2020, 36 (4): 48-53.   Abstract （139）            Knowledge map    Save The current study focuses on the flow and temperature filed for a special-shaped tundish applied in a steelmaking plant.The tundish were investigated with the help of numerical modelling to improve the flow and temperature field in tundish which assembles a turbulence inhibitor and several dams.The research results showed that the flow field in the prototype tundish are not favorable for temperature homogenuous,resulting in a large temperature differences between outflows.With the optimization of tundish,the dead zone volume is reduced to 7.52 % from 22.05 %,which is the dead zone volume from the prototype,demonstrating a significant improvement on the flow field，as well as the temperature distribution.In addition,the uniformity of flows were evaluated by calculating the standard deviation.The optimized tundish showed that an appropriate combination of inhibitor and dams makes homogeneous flow and temperature field in the tundish. Related Articles | Metrics

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Nitrogen absorption control of molten steel in 120 t LF refining process Steelmaking    2023, 39 (3): 44-51.   Abstract （65）      PDF（pc） （8202KB）（83）       Knowledge map    Save Related Articles | Metrics

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Progress on desulfurization and silicon content control technology of LF refining for low silicon steel Steelmaking    2023, 39 (3): 1-15.   Abstract （113）      PDF（pc） （16499KB）（82）       Knowledge map    Save Related Articles | Metrics

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Study on transformation of non-metallic inclusions in 20CrMnTiH gear steel during solidification and cooling Steelmaking    Accepted: 01 January 1900

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Density evolution of solid films of mold fluxes for peritectic steel continuous casting Steelmaking    Accepted: 01 January 1900

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Investigation on the crust mechanism of tundish cover powder during continuous casting of ultra-low carbon steel Steelmaking    2023, 39 (2): 36-41.   Abstract （77）      PDF（pc） （5489KB）（101）       Knowledge map    Save The industrial trials and thermodynamic calculation were carried out to investigate the composition evolution, crystallization phase, and crust mechanism of tundish cover powder (TCP) during continuous casting of ultra-low carbon steel. The results showed that the ladle slag had a relatively strong oxidation capacity at RH departure and the w(CaO)/w(Al2O3) in the slag was low. The top slag of RH refining needs to be modified. Due to the slag carryover, mix of ladle filler sands and TCP, the composition of TCP during continuous casting has been significantly changed. Furthermore, the MgO·Al2O3 spinel in liquid phase was first formed and it promoted the nucleation and growth of 2CaO·Al2O3·SiO2 and CaO·TiO2 phases, resulting in the crust of TCP. To avoid the crust of TCP during continuous casting, the ladle carryover at cast end should be strictly controlled, and the  mass fraction of SiO2 and MgO in the original TCP are reduced to (10±2.5) % and 5.0 %～7.5 % respectively, which will inhibit the precipitation of 2CaO·Al2O3·SiO2  and MgO·Al2O3 spinel phases. Related Articles | Metrics

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Practice of precise and specialized production for ultra-low carbon IF steel Steelmaking    Accepted: 01 January 1900

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Influence of Ca content control on Ds inclusions in molten steel Steelmaking    2023, 39 (3): 79-85.   Abstract （83）      PDF（pc） （6351KB）（72）       Knowledge map    Save Related Articles | Metrics

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Optimization of mold flow field and SEN port shape in continuous casting of automobile exposed panel Steelmaking    Accepted: 01 January 1900

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Effect of tellurium on the sulfide and machinability of free cutting steel Steelmaking    2021, 37 (3): 66-73.   Abstract （112）            Knowledge map    Save Related Articles | Metrics

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Formation reason and control of craze cracks on the surface of 50 steel plate Steelmaking    2023, 39 (2): 62-67.   Abstract （87）      PDF（pc） （6516KB）（79）       Knowledge map    Save Aiming at the problem of serious surface craze cracks (incidence rate 7.92 %) of 50 steel plate rolled by 200 mm thick continuous casting slab, the morphology, distribution and composition of surface cracks were studied by means of scanning electron microscopy and spectral analysis. The results showed that surface cracks randomly appeared on the steel plate without fixed position in the width direction of the steel plate, and the crack depth was shallow, and the two sides of them showed the characteristics of high-brightness structure and oxidation dots. Spectral analysis showed that the carbon mass fraction at the crack was 0.2 %-0.3 % higher than that of the matrix, which showed that the slab of 50 steel was partially carbonized during the continuous casting process by mold flux with some carbon content. Subsequently, cracks and obvious high temperature oxidation characteristics were caused by uneven thermoplasticity of the slab during heating and rough rolling. According to the carburizing mechanism of continuous casting mold flux, the continuous casting process parameters such as mold slag line adjustment mode, casting speed, nozzle shape, mold flux composition, etc. were optimized, which effectively reduced the occurrence of local carburization on the surface of the continuous casting slab and cracking of the 50 steel plate. Related Articles | Metrics

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Numerical analysis of flow field based on the new desulfurization agitator of KR method Steelmaking    2020, 36 (5): 14-20.   Abstract （91）            Knowledge map    Save In order to improve desulfurization equipment and technology of hot water pretreatment，and improve the desulfurization efficiency，a new type of agitator was formed through combining the advantages of agitator and spray gun with reference to the traditional KR desulfuration method. The flow field in the hot metal tank was analyzed by Fluent software and Eulerian model. The effects of different eccentricity，stirring speed and ventilation flow of the agitator on the desulfurization effect were studied from the aspects of flow velocity and gas distribution. The results showed that the new agitator could enhance the flow field，and the desulfurization gas ejected by the nozzle at the bottom of the agitator would make the desulfurization gas spread more widely and more evenly in the iron tank. When the new agitator had a stirring speed of 150 r/min，ventilation flow rate of 5.0 m3/h and eccentricity of 0.3，the distribution and intensity of gas was the best，and the flow field had a large average velocity，which was beneficial to the reaction of hot metal and desulfurization agent. Related Articles | Metrics

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Thermodynamic study on deoxidization and inclusion control of sulfur-containing gear steel Steelmaking    Accepted: 01 January 1900

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Research progress on several key technologies of converter steelmaking  Steelmaking    2024, 40 (1): 1-8 .   Abstract （69）      PDF（pc） （1984KB）（65）       Knowledge map    Save Related Articles | Metrics

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Mechanism analysis and industrial practice of manganese sulfide inclusion control in steel Steelmaking    2023, 39 (4): 1-12.   Abstract （67）      PDF（pc） （9560KB）（64）       Knowledge map    Save The control of MnS inclusions in steel is a system engineering which involves multiple processes including smelting, solidification, heating and rolling, and requires multi-variable cooperative control. In this paper, the research status of MnS inclusions at home and abroad was discussed in detail, and the influence mechanism of different elements, heat treatment and rolling process on MnS inclusions were expounded. In addition, the current process control measures of MnS inclusions were summarized. The morphology, size and quantity of MnS inclusions can be effectively controlled by adopting appropriate deoxygenation process, improving the oxygen content at the solidification front, reducing the basicity of refining slag, adopting appropriate Ca treatment process, adopting low basicity tundish covering agent, increasing the secondary cooling water volume, strengthening cooling and reducing electromagnetic stirring intensity. In recent years, some new ideas have been proposed to control the deformation treatment and diffusion distribution of MnS inclusions. The morphology, size and quantity of MnS inclusions in steel can be effectively controlled by adding Mg, Ca-Mg, Zr, Ce and Te elements into molten steel. Related Articles | Metrics