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Research and application of high efficiency and long life combined blowing technology for 300 t converter in Masteel Steelmaking    2022, 38 (3): 6-11.   Abstract （346）            Knowledge map    Save Related Articles | Metrics

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Study and practice of BOF less-slag steelmaking technology with high-titanium hot metal Steelmaking    2022, 38 (4): 28-35.   Abstract （331）      PDF（pc） （1638KB）（133）       Knowledge map    Save The consumption quantity of slagging materials is one of key economic and technical indicators of BOF steelmaking and represents the technical level of steelmaking, but it is inconsistent with the requirements of dephosphorization and furnace-lining protection. In an iron and steel enterprise, the contents of titanium and phosphorus in hot metal are high due to titanium-bearing iron ore used for ironmaking in blast furnace, so the consumption quantity of slagging materials is high in order to meet requirements of dephosphorization and furnace-lining protection. Therefore, based on the characters of high-titanium hot metal and the characteristics of slagging in BOF, the rules about oxygen supply and slagging were improved, a method called as “magnesium fixing titanium” (TiO2 becomes inactive due to its combining with MgO) was taken as a technique to suppress the disadvantage influence of high TiO2 slag on dephosphorization and furnace-lining protection to enhance the advantage efficiency of slag. By the continuous improvement of the above processes, a BOF less-slag steelmaking technology with high-titanium hot metal was developed. The consumption quantity of slagging materials was reduced from 55.67 kg/t to 47.86 kg/t. Good economic benefit was achieved, and a foundation for the development of high efficient steelmaking technology was laid. Related Articles | Metrics

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Study on LF refining desulfurization process for SPHC steel Steelmaking    2022, 38 (3): 31-36.   Abstract （277）            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 （264）            Knowledge map    Save 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 （255）            Knowledge map    Save Related Articles | Metrics

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Prediction of Mn alloying yield in converter tapping process based on GA-BP neural network Steelmaking    2022, 38 (4): 14-20.   Abstract （241）      PDF（pc） （1005KB）（81）       Knowledge map    Save Deoxidization alloying is the last step of converter smelting process. The accuracy of alloy content control in molten steel directly affects the smelting difficulty and smelting cycle of refining process. The yield of alloy is an important reference standard for converter alloying workers. The accuracy of determining the yield of alloying elements directly affects the stability of molten steel composition and production cost. Through theoretical analysis and actual data verification，9 observable indicators that affecting manganese yield were selected. The data was then reduced by means of the factor analysis，and the 6 public factor matrices were obtained as the input of the model，the manganese yield was the output of the model，and the manganese  yield prediction model based on GA-BP neural network was established. The results show that the regression coefficient of the model R2 = 0.714 78，the average error is 0.01. The number of more than 98 % of the predicted accuracy accounts for 75 % of the total，and the accuracy of the prediction is high，and the actual production has certain reference significance.  Related Articles | Metrics

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Research on stopper rod corrosion mechanism and improvement for low-carbon and low-alloy steel Steelmaking    2022, 38 (4): 71-77.   Abstract （238）      PDF（pc） （3146KB）（124）       Knowledge map    Save In view of stopper rod abnormal erosion of SAE series low-carbon and low-alloy steel during casting process, stopper rod erosion mechanism and corresponding improvement measures were proposed through phase analysis and element distribution. The results show that the high carbon component in stopper rod reacts with the oxygen in molten steel to form a decarburized layer on the surface of stopper rod. The inclusions with high SiO2 component in molten steel adhere to the surface of stopper rod, react with MgO, MgO·Al2O3, and form low melting point phase of Mg2SiO4 type, which is brought into molten steel under the action of molten steel, causing corrosion of stopper rod. The abnormal corrosion of stopper rod was significantly improved by selecting stopper rod with low carbon, high density and appropriate amount of SiC, increasing basicity of slag and reducing oxygen content in molten steel, and the number of tundish continuous casting furnaces increased from 8-10 furnaces to more than 15 furnaces. 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 （236）            Knowledge map    Save Related Articles | Metrics

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Production practice of improving the ladle self opening rate after VD process  Steelmaking    2022, 38 (6): 42-45.   Abstract （227）      PDF（pc） （708KB）（24）       Knowledge map    Save In view of the low self opening rate of 60 t ladle after VD process in a steel plant, the influencing factors such as hot repair operation, nozzle brick material, steel grade, ladle temperature, molten steel holding time and storage time of molten steel in ladle were analyzed. Due to the long storage time of molten steel in ladle after VD refining, the sintering layer of stuffing sand was thick and the self opening rate of ladle was low.Through the optimization and improvement of the material of the stuffing sand and the comparative test, the self opening rate of the ladle of the improved stuffing sand after VD process reached 99.38 %. Related Articles | Metrics

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Study on the influence of refined slag on non-metallic inclusions in U75V steel Steelmaking    2022, 38 (4): 54-62.   Abstract （225）      PDF（pc） （3023KB）（134）       Knowledge map    Save The effects of basicity of refining slag and Al2O3 content on non-metallic inclusions in U75V steel were studied. The results showed that the basicity of refining slag had a great influence on the inclusions in steel. In the refining process of U75V steel, with the increase of basicity of refining slag from 1.4 to 2.0, the composition of inclusions in steel  changed greatly. The average mass fraction of CaO increased from 43% to 62%, while the average mass fraction of SiO2, MgO and Al2O3 decreased from 37 %、16 % and 4 % to 8 %, 9 % and 2 % respectively. The basicity of refining slag had a great influence on the number density of inclusions in U75V steel. When the basicity was 1.4, the number density of inclusion was 2.95/mm2. With the increase of basicity to 1.8, the number density of inclusion decreased to 1.42/mm2, and the number density of inclusion began to increase. When the basicity of refining slag was 1.8, the number density of inclusion in steel was the lowest, and the refining slag was more conducive to the removal of inclusion. Al2O3 content in refining slag had an important effect on inclusions in steel. With the increase of Al2O3 content from 0 to 3%, the contents of CaO and SiO2 in the inclusions decreased, while the contents of MgO and Al2O3 increased. The mass fraction of Al2O3 in the refining slag was increased to 6 %, and the mass fraction of CaO in the inclusion remained stable at about 40 %, while the content of MgO and SiO2 decreased slightly, and the mass fraction of Al2O3 increased to about 18 %. With the increase of Al2O3 content in slag, the number density of inclusion in steel increased continuously, and when Al2O3 mass fraction in slag increases from 3 % to 6 %, the number density of inclusion increased by nearly one time. Therefore, U75V needs to control the Al2O3 mass fraction in refining slag below 3 %. In the process of production, Als and Al2O3 content in alloy and slag-making materials should be strictly controlled, Al2O3 content in slag should be reduced, and basicity of slag should be controlled at about 1.8. Related Articles | Metrics

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Effect of Mg treatment on secondary phase particles, microstructure and toughness in the HAZ of steel plate Steelmaking    2023, 39 (2): 1-17.   Abstract （215）      PDF（pc） （38913KB）（61）       Knowledge map    Save The effect of Mg treatment on secondary phase particles, microstructure and toughness in the HAZ of steel plate were reviewed, and the combined effect of w(Ti)/w(N), Al, Nb and B on microstructure and toughness of the Mg treatment steel plates were discussed. When the Mg mass fraction was 27×10-6, the volume fraction of IAF in HAZ had the highest value of 55.4 %, and the size of effective inclusions to promote the growth of IAF was concentrated at about 2 μm. With the increase of Mg content, TiN nanoparticles in steel were incrementally refined, and the value of the low-temperature impact toughness in HAZ zone increased linearly with the increase of the volume density of TiN nanoparticles. For ferritic shipbuilding steel plate, Mg treatment promoted the growth of intragranular acicular ferrite. After adding Mg mass fraction with 49×10-6, the impact toughness of the heat affected zone at -40 ℃ increased from 20 J to 167 J. For bainite marine engineering steel plate, after adding Mg mass fraction with 42×10-6, the secondary phase particle dissolution amount at high temperature became large, the pinning force decreased, and the grain size was coarsened. The toughness of HAZ at -40 ℃ decreased from 201 J with w(Mg)=2×10-6 to 58 J with w(Mg)=42×10-6. The optimum w(Ti)/w(N) was maintained at about 3.42. At this time, the number of precipitated particles in the secondary phase increases and the size decreased, which enhanced the pinning effect on grain boundaries. The addition of Al would reduce the HAZ toughness of the steel plate and the impact toughness at -20 ℃ was reduced from 201 J to 75 J when the Al mass fraction was 200×10-6. After adding Nb,the brittle structure in steel was increased. The HAZ impact toughness at -40 ℃ decreased from 127 J to 58 J after adding Nb mass fraction with 160×10-6 to Mg treatment steel plate. B would improve the hardenability of the steel, and the segregation at the grain boundary inhibits the formation of grain boundary ferrite. The impact toughness at -40 ℃ increased from 40 J to 141 J when 22×10-6 w(B) was added to the Mg treatment steel plate. Related Articles | Metrics

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Comparison of gasliquid two phases flow behavior in hot metal ladle between rotary injection and traditional injection Steelmaking    2022, 38 (5): 23-30.   Abstract （207）      PDF（pc） （1823KB）（111）       Knowledge map    Save Related Articles | Metrics

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Research on microstructure evolution behavior of small particle limestone during rapid calcination at high temperature Steelmaking    2022, 38 (5): 38-42.   Abstract （203）      PDF（pc） （2866KB）（61）       Knowledge map    Save Related Articles | Metrics

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Research on the characteristics with highintensity top and bottom combined blowing in 120 t converter Steelmaking    2022, 38 (5): 43-49.   Abstract （199）      PDF（pc） （4883KB）（85）       Knowledge map    Save Related Articles | Metrics

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Research progress on several key technologies of converter steelmaking  Steelmaking    2024, 40 (1): 1-8 .   Abstract （196）      PDF（pc） （1984KB）（185）       Knowledge map    Save Related Articles | Metrics

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Study on water model test of KR stirred hot metal desulfurization Steelmaking    2022, 38 (5): 10-15.   Abstract （194）      PDF（pc） （968KB）（84）       Knowledge map    Save Related Articles | Metrics

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Research and practice of producing SK2 high carbon tool steel by CSP process Steelmaking    2022, 38 (4): 84-88.   Abstract （194）      PDF（pc） （2142KB）（63）       Knowledge map    Save Based on the characteristics of SK2 advanced high carbon tool steel, the production process of converter and refining to control the cleanliness of molten steel was analyzed, and the optimization direction of continuous casting mold flux, casting speed and specific water volume was studied. The process of high carbon and low phosphorus at the end of converter and oxygen and nitrogen control in refining process was designed. The continuous casting protective slag with low basicity, low melting point and good lubricity and the continuous casting process with secondary cooling specific water volume of 1.6-1.7 L/(kg·min) and drawing speed of 3.5-4.0 m/min were developed. The steelmaking process for producing SK2 steel was successfully developed in the thin slab continuous casting and rolling production line. 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 （194）            Knowledge map    Save Related Articles | Metrics

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Existing form of Sn in free-cutting steel and its effect on cutting performance Steelmaking    2022, 38 (6): 66-72.   Abstract （188）      PDF（pc） （1836KB）（16）       Knowledge map    Save Tin free-cutting steel is a new environmentally friendly free-cutting steel that is expected to replace lead free-cutting steel. The existing form of tin in steel is an important factor affecting the cutting performance of steel. In this paper，metallographic microscopy (OM)，scanning electron microscopy (SEM)，electron microprobe (EPMA) and other characterization methods were used to analyze the state of tin in high sulfur free-cutting steel and the effect of tin content on the cutting performance. It was found that no significant tin precipitation phase was observed in the tin-containing steel. Tin was soluted in the solid steel matrix，and mainly tended to be soluted in the ferrite. Tin distorted the lattice of the ferrite. The cutting tests showed that when the mass fraction of tin changed from 0 to 1 600×10-6，the C-type chip ratio increased from 60.19 % to 90.29 % at the cutting speed of 560 r/min. Tin content had a significant enhancement effect on the formation of C-type chip. In cutting the same sample，the proportion of C-type chip was also the largest at cutting speed 560 r/min compared to that at other two speeds，which indicated that the cutting performance was better at this speed. In addition，the addition of tin led to a reduction in surface roughness and better surface quality of the machined sample. The Vickers hardness also increased from 118.2 HV to 143.1 HV with the addition of tin mass fraction from 0 to 1 800×10-6 by microhardness test. The solid solution of Sn in the steel increased the hardness of the soft steel matrix，which led to a significant improvement of the cutting performance of the steel. Related Articles | Metrics

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Study on improvement of center shrinkage cavity in axle steel round bloom by end reduction process Steelmaking    2022, 38 (5): 67-72.   Abstract （185）      PDF（pc） （2537KB）（63）       Knowledge map    Save Related Articles | Metrics