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

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Research and practice on precision control technology of boron content in boron-bearing medium carbon steel produced by converter Steelmaking    Accepted: 01 January 1900

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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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Evolution rules of inclusions in high quality bearing steel produced by BOF-LF-RH-CC and EAF-LF-VD-CC process Steelmaking    Accepted: 01 January 1900

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Research on slag entrainment by vortex during continuous casting in 250t ladle Steelmaking    Accepted: 01 January 1900

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Steelmaking    2005, 21 (06): 58-62.   Abstract （869）            Knowledge map    Save Related Articles | Metrics

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Process research on LF with steel scrap as the addition Steelmaking    2020, 36 (5): 27-31.   Abstract （322）            Knowledge map    Save Due to the slump of steel scrap price in domestic，using steel scrap as the raw material for converter smelting can greatly reduce the production costs. Combined with its own process features，Tianjin Tiangang United Special Steel Co.，Ltd. fully used the arc heat source of LF furnace and the residual temperature of molten steel to melt steel scrap. According to the thorough research on the melting mechanism，melting and mixing time and inclusion analysis of steel scrap adding to LF refining furnace，the reasonable process of LF refining furnace with steel scrap as the addition was determined，thus the steel scrap ratio in steelmaking was improved，and the iron loss was reduced. Through production practice，when LF refining furnaces were fed with steel scraps reaching 1.54t per furnace in June，2019，iron loss could be reduced to 10.56kg/t. By means of benefit accounting，when a gap between the price of steep scraps used in LF refining and the sales price of actual steel billets reached more than 280yuan/t，distinct economic benefits could be produced. Furthermore，adding steel scraps during LF refining didn’t cause adverse effects to the quality of molten steel，The endpoint oxygen level met steel grade requirements，and showed remarkable effects. Related Articles | Metrics

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Water model study on converter steelmaking with nozzle-twisted lance Steelmaking    Accepted: 01 January 1900

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Development and prospect of Mg clean steel technology Steelmaking    2020, 36 (5): 1-13.   Abstract （277）            Knowledge map    Save Nonmetal inclusion control has always been an important subject in clean steel production. In recent years，the focus of Mg application in steel has changed from the traditional modification of inclusions to the microalloying. This paper reviews the research status of Mg application in steel at home and abroad，represents the advantages of Mg from several aspects，such as cleanliness control，oxide metallurgy，solidification microstructure refinement，slab crack control，etc. The possible development fields and directions of magnesium clean steel are also analyzed and prospected. 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 （229）            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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Research and practice of non-metallic inclusion control process for wheel steel SCX400 Steelmaking    2020, 36 (6): 54-60.   Abstract （242）            Knowledge map    Save The cleanliness problem of SCX400 wheel steel plates was checked by SEM and the results showed that the dot-line macro-inclusions inside the steel plates shaped from the big CaO-MgO-Al2O3 inclusions during rolling process, and those inclusions oriented form refining and casting process, not floating up into slag, consequently kept inside of slabs. Base on this study, actions were implemented to change inclusion into solid classes before RH process as Al2O3, MgO-Al2O3 or high melting point CaO-MgO-Al2O3 who have better tendency to float upon, and then global Al2O3-MgO-CaS inclusions, with high melting point. After that, inclusions were tested as Al2O3 or Al2O3-CaO cores coated by CaS inside the plate. The single-test qualified rate increased from previous 90 % to current 95.4 %, whilst cracking defect rate in production decreased to 0.5 %-1.0 % and the fatigue lifetime of wheels stabilized beyound million times. Related Articles | Metrics

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Effect of antioxidant in MgO-C brick on acid soluble aluminum in tire cord steel Steelmaking    2020, 36 (5): 69-74.   Abstract （203）            Knowledge map    Save In order to avoid the formation of brittle inclusions in tire cord steel, the measures that controlling the Al content of charge and alloy and making low basicity slag system in LF refining furnace were adopted，and the mass fraction of acid soluble aluminum (Als) in molten steel could be controlled at about 9×10-6. By optimizing the type and content of antioxidants in ladle magnesia carbon lining brick, reducing the metal Al powder from 1.61% to 0.15%, and replacing the rest by the same amount of Si powder，w(Als) in molten steel reduced from 8.8×10-6 to 6.1×10-6, with a decrease of 30.7%. The average mass fraction of Al2O3 in typical composite inclusions in steel reduced to 8.6%, while the maximum was 23.8%. The inclusions could be controlled in the plastic zone of low melting point. Related Articles | Metrics

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Study on evolution behavior of the quicklime reactivity under high temperature Steelmaking    2020, 36 (5): 79-84.   Abstract （399）            Knowledge map    Save The disintegration caused by f-CaO is one of the main obstacles to the utilization of steel slag. The f-CaO come from the incomplete dissolution of the quick lime and the decomposition of tricalcium silicate. In terms of the f-CaO derived from the undissolved lime，it is necessary to strengthen the dissolution behavior of lime in the converter process. The lime reactivity plays a key role on its dissolution, and is closely related to its microstructure. The evolution behaviors of the reactivity and microstructure of quick lime under high temperature were investigated in this work. The lime samples were prepared in the laboratory, the microstructure was detected and analyzed by SEM, XRD and a mercury-injection instrument, and the reactivity was test according to YB/T 105—2005 standard. The results showed that， when temperature increased, the reactivity and porosity of the quick lime decreased，and the average diameter of pores increased. The CaO crystals grew gradually under the action of the grain boundary migration. The change of microstructure was closely related to the change trend of lime activity. On basic of the growth of CaO crystal and the decrease of the porosity, the lime activity decreased，which would obstacle the dissolution of quick lime during the steelmaking process and increase the content of f-CaO in the slag. Related Articles | Metrics

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Research on control equipment of straight edge crack defect of medium plate Steelmaking    Accepted: 01 January 1900

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Pressure swing adsorption for oxygen generation and its application in EAF steelmaking Steelmaking    Accepted: 01 January 1900

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Physical simulation on optimization of submerged entry nozzle for non-equilibrium beam blank casting mold Steelmaking    Accepted: 01 January 1900

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Numerical simulation of polymerization behavior of inclusion in the swirling flow tundish Steelmaking    2020, 36 (5): 37-43.   Abstract （297）            Knowledge map    Save The swirling flow tundish is the tundish that adds a swirl chamber in the injection zone. The gravity potential energy is converted into rotating kinetic energy when the molten steel flows into the tundish along the tangent direction from the bottom of the swirl chamber through the long nozzle. Inclusion follows the molten steel rotating in the swirling chamber and is more likely to collide and grow. The PBM model of the commercial software Fluent was used to simulate the behavior of inclusion colliding growth during the process of inclusion flowing into the tundish with molten steel. The simulation result showed that considering the collision and polymerization between inclusions，the polymerization and growth of inclusion was obvious. The number density of inclusion was decreased and the average diameter of inclusion was increased. The same size parameter of the swirling flow tundish was compared with the non-swirling chamber tundish. The average diameter of non-swirling chamber tundish increased from 3.93μm to 4.25μm, increased by 8.12%. The average diameter of inclusion in swirling tundish increased from 3.93μm to 4.35μm, increased by 10.68%. Swirling flow tundish is more conducive to the collision growth of inclusion. Related Articles | Metrics

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Thermodynamics and industrial practice of non-metallic inclusions formation during deoxidation of Q195 hot rolled strip Steelmaking    Accepted: 01 January 1900

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Thermodynamics and industrial practice on the formation of non-metallic inclusions in GCr15 bearing steels during deoxidation process Steelmaking    Accepted: 01 January 1900