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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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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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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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Cause analysis and improvement measures of unqualified ultrasonic flaw detection for largesize storage tank steel 12MnNiVR#br# Steelmaking    2022, 38 (3): 69-72.   Abstract （144）            Knowledge map    Save Related Articles | Metrics

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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 （78）      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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Evolution of the nonmetallic inclusions of bearing steel produced by 90 t EAF→LF→VD→CCM process Steelmaking    2022, 38 (3): 58-61.   Abstract （180）            Knowledge map    Save Related Articles | Metrics

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Prediction of slag liquidus temperature based on machine learning algorithm Steelmaking    2022, 38 (3): 12-19.   Abstract （126）            Knowledge map    Save Related Articles | Metrics

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Analysis and control of reticular crack on the surface of continuous casting round billet Steelmaking    2022, 38 (3): 43-47.   Abstract （101）            Knowledge map    Save Related Articles | Metrics

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Evolution of nonmetallic inclusions in rareearth treated nonoriented electrical steel Steelmaking    2022, 38 (3): 48-57.   Abstract （52）            Knowledge map    Save Related Articles | Metrics

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Water modeling of the influence of bottom inclination on the mixing phenomena in KR process Steelmaking    2022, 38 (3): 1-5.   Abstract （137）            Knowledge map    Save Related Articles | Metrics

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Variation law of typical inclusions in bainitic steel production process Steelmaking    2022, 38 (3): 62-68.   Abstract （128）            Knowledge map    Save Related Articles | Metrics

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Study on fine characterization of microstructure difference of wire rod for ultra-fine steel saw wire#br# Steelmaking    2022, 38 (3): 73-84.   Abstract （110）            Knowledge map    Save Related Articles | Metrics

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Study on LF refining desulfurization process for SPHC steel Steelmaking    2022, 38 (3): 31-36.   Abstract （205）            Knowledge map    Save 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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Molten steel flow and inclusions behavior during RH vacuum treatment based on ladle bottom argon blowing Steelmaking    2022, 38 (3): 26-31.   Abstract （197）            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 （89）      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 simulation of the effect of tundish structure on steel fluid flow and inclusion removal Steelmaking    2023, 39 (2): 42-48.   Abstract （70）      PDF（pc） （12132KB）（76）       Knowledge map    Save A three-dimensional numerical model of a 72 t tundish in HBIS Group Tangsteel New District was established to investigate and compare the effect of different tundish structures on the steel level fluctuation, velocity distribution, residence time, and inclusion removal, including the turbulence inhibitor, weir and dam. The turbulence movement of the molten steel was calculated using the Realizable k-ε model. The residence time of molten steel was achieved by solving a concentration scalar equation (User-Defined Scalar, UDS), and the floating and removal of inclusions was obtained by solving the Discrete Phase Model (DPM). The results show that the level fluctuation near the upper nozzle of the tundish under the turbulence inhibitor with eaves and the opening turbulence inhibitor fluctuated greatly, which was about 3～4 times of that without the turbulence inhibitor. However, with the turbulence inhibitor with baffles, the molten steel formed a circulating flow between the baffles and the fluctuation of the liquid level was small, even smaller than the situation without the turbulence inhibitor. The moving distance of the molten steel in the tundish was increased when the weir and dam in the tundish existed at the same time, which was conducive to the floating and removal of inclusions. Under the current conditions, the average residence time of molten steel was longer and the removal rate of inclusions floating was higher when the weir and the dam were 1 060 mm and 2 000 mm from the width center of the tundish.  Related Articles | Metrics

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Research on metallurgical effect of doublechannel electromagnetic induction heating tundish Steelmaking    2022, 38 (3): 37-42.   Abstract （95）            Knowledge map    Save Related Articles | Metrics

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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