Abstract:The complex corrosive environment in underground coal mines seriously threatens the safety and service life of equipment,and traditional high-strength steel is difficult to meet the demands.This paper aims at the characteristics of weak alkalinity and high mineralization degree of mine water in coal mines.Through systematic analysis of the corrosion mechanism,the design and preparation of 550 MPa corrosion-resistant high-strength steel with a thin specification of 10-25 mm are carried out.When designing the composition,mechanical,welding and corrosion resistance properties are taken into account,and the online quenching+medium-temperature tempering process is adopted.Experiments show that the produced Q550D corrosion-resistant high-strength steel has an average yield strength of≥570 MPa,an average tensile strength of ≥ 650 MPa,an average elongation after fracture of ≥18％,and an average longitudinal impact energy of≥150 J at-20℃.It has excellent mechanical properties.Its average corrosion rate is only two-thirds of that of traditional Q550D steel,and its corrosion resistance is 1.5 times higher.The research results provide high-quality steel for coal mine engineering and have an improving effect on ensuring safe production and reducing costs.

Abstract:The current LF refining endpoint temperature prediction is mainly based on the heat balance of the LF refining process,which is achieved through existing empirical judgment,theoretical analysis,big data regression,and other methods.However,it does not fully consider factors such as the temperature drop of different ladle conditions and the waiting time after the ladle leaves the station.On the basis of fully considering the significant influencing factors in the LF refining station,this paper focuses on the actual situation and conducts regression analysis on different types of ladle conditions and production organization modes.Real time temperature prediction models and endpoint temperature prediction models for the LF refining process are constructed,and verified online in different steel mills at 4 × 120 t and 4 × 210 t,with the deviation between predicted temperature and measured temperature fully meeting normal actual production,providing accurate guidance for temperature control in the LF refining process.

Abstract:In the process of iron ore sintering and blending optimization in steel production,fluctuations in iron ore supply and prices result in a wide variety of raw materials and complex blending ratios.This complexity transforms the optimization problem from linear to nonlinear.Traditional linear programming methods struggle to effectively handle these nonlinear issues,leading to low computational efficiency and difficulty in obtaining global optimal solutions.To address these challenges,this study proposes a solution based on a locally linear iterative method.By introducing slack variables and numerical differentiation,nonlinear constraints are transformed into linear forms,and iterative approximations gradually converge to the optimal solution,significantly improving computational efficiency and stability.Focusing on minimizing sintering production costs,the system integrates technologies such as MATLAB and MySQL to construct a sintering ore blending optimization model.Practical applications demonstrate that the model can generate global optimal solutions within 10 seconds while satisfying complex constraints,reducing the production cost per ton of sintered ore by 5.8 Yuan.This approach delivers substantial economic benefits to enterprises.

Abstract:This paper proposes to use high-carbon pre-reduced iron-carbon alloy pellets in Consteel EAF smelting process after pre-reduction,crushing and high-pressure forming with iron oxide raw materials,graphite powder and additives,which increases carbon content and improves the technical specifications of the entire scrap steel arc furnace smelting process.The preparation process,product composition and physical test performance of the pellet were introduced.The influence of the pellets on the continuous feeding arc furnace smelting technical index after the addition of the pellet was evaluated by material and heat balance,and the industrial test was carried out in a 70 t continuous arc furnace.The results show that after adding 20 kg pellets per ton of steel,the average smelting cycle was shortened by 7.45 min,and the average ton steel power consumption was reduced by 8.78 kW·h.

Abstract:To determine the determination of SiO2,S,P and other components in fluorite,the sample was cooled into the sample box after automatic weighing and melting system,and then transferred to MXF-2400 type X-ray fluorescence spectrometer for determination.Through a variety of comparative tests,the measurement results of each group in the melt sheet method are accurate and reliable,and can be accepted.Samples were determined by X-ray fluorescence spectrometer melt method instead of gravimetric method for SiO2,phosphorus molybdenum blu-ray method for P,infrared carbon-sulfur method for S,under the premise of maintaining the accuracy of the results,the detection time was significantly shorter than the traditional detection method,because the use of glass melts,so the stability has been significantly improved,through the development of fluorite X-ray fluorescence spectrometer automatic melting system detection,It has a very important guiding significance for the material ratio in fluorite,the output of hot metal and the performance of steel,and also avoids the pollution of soil and water by the waste liquid containing heavy metal ions generated in the process of chemical determination of SiO2 and P.

Abstract:With the development of automotive industry,higher performance requirements are put forward for lightweight automotive steel,which promotes the continuous optimization of smelting process.In this paper,the 700L smelting process of automobile beam steel was optimized.The dephosphorization rate of converter was improved by improving the early oxidation of converter,slag retention operation,reasonably controlling the lance position and oxygen flow,and using slag detection and slag retaining cone technology;By optimizing the refining furnace slag system,refining deep deoxidation,using automatic argon blowing,double stage soft blowing,whole process protective pouring,slab weak cooling and other technologies,the stable production of 700L coil was realized.Through process optimization,the yield strength of 700L steel is 607-618 MPa,the tensile strength is 699-732 MPa,the elongation after fracture is 18％-21.5％,and the absorption work is 91.03-102.37 J,which has good comprehensive mechanical properties and meets the needs of steel for automotive industry.

Abstract:The advantages and disadvantages of the vibrating fluidized bed and disc dryer used in the ammonium sulfate drying systems of coking enterprises are analyzed and compared.The main modifications involved in adding a disc dryer to the ammonium sulfate process in the northern area of the Taiyuan Iron and Steel(TISCO)coking plant are summarized.Based on on-site conditions,the heating,cooling,and exhaust gas recovery systems of the drying system were modified,and the disc dryer unit itself was optimized and upgraded,thereby increasing the single-machine drying capacity for ammonium sulfate.After the modifications,steam consumption was reduced,exhaust gas emissions during the drying process were significantly decreased,the on-site environment was markedly improved,workers' labor intensity was reduced,and the energy-saving effect was significant.

Abstract:The shape of the roughing transfer bar in hot continuous rolling can affect the entry position of the rolled material at the finishing vertical rolls,thereby influencing the roll gap level adjustment of the rolling mill.This paper uses the ABAQUS finite element software to establish a finite element simulation model of the entry vertical edger of the finishing mill and the transfer bar from rough rolling.Based on the working condition parameters,experiments are designed,and simulations are conducted to calculate the displacement of the slab's head after passing through the vertical edger,considering different shapes and postures of the incoming intermediate slabs.A multivariate linear regression method is used to establish a model for the transverse offset of the transfer bar's head entering the finishing mill.Then,based on the transverse offset results,the roll gap adjustment value of the F1 stand is calculated using the roll deformation theory model.The relevant results have been applied to the 1 580 hot rolling production line of Ma'anshan Iron and Steel,improving the strip deviation at the head during the finishing process.

Abstract:This study focuses on the preparation and performance exploration of alloy steels with different titanium contents,as well as the influence and control methods of impurity elements on titanium recovery rate during steelmaking process.Alloy steel samples with titanium contents of 0％,0.05％,and 0.10％were prepared using vacuum arc furnace smelting technology.The effects of titanium content changes on the microstructure,mechanical properties,and low-temperature impact toughness of the steel were systematically studied.The results indicate that titanium microalloying can effectively refine the grain size,significantly improve the strength,plasticity,and low-temperature impact toughness of steel.At the same time,the influence of impurity elements such as oxygen and sulfur on titanium recovery rate was deeply explored,and a method for removing inclusions by optimizing the refining slag composition was studied for aluminum deoxidized steel.

Abstract:Based on AI digital twin technology,real-time key data of each link in the continuous casting process can be obtained,which can accurately simulate and predict the continuous casting process,predict the possible results under different process parameters and operating conditions,and optimize the actions of the billet production process in a timely manner based on analysis;Through the optimization design of stack algorithm,automatic billet control that flexibly meets the requirements of multiple billet types and processes is achieved,realizing the information tracking of casting billets.At the same time,achieving automation and intelligence in steel billet management,providing timely,accurate,and comprehensive production data,and meeting the requirements of steel mills for steelmaking cost accounting and metal yield.

Abstract:During the production process of the European standard 355 MPa grade low-temperature and high-strength steel plate,in response to the problem of transverse cracks at the corner position of the lower surface of the head,in-depth exploration of the root cause of the crack formation was carried out by means of metallographic analysis,scanning electron microscopy observation and energy spectrum analysis.Research shows that the main causes of cracks lie in the oxidation reaction of the continuous casting billet during the heating stage and the uneven cooling phenomenon under the winter smelting conditions.In view of this,through the optimization of the production process,including the precise regulation of the cooling water temperature,the control of the billet pulling rate and the strengthening of the flame cleaning process,etc.,the crack incidence rate has been significantly reduced.The improvement has laid a solid technical foundation for the reliable application of European standard high-strength steel plates in low-temperature environments.The process parameters of flame cleaning were strengthened,and a systematic process improvement plan was formed.After optimization,the crack incidence rate was significantly reduced,ensuring the service reliability of the steel plate in a low-temperature environment.

Abstract:The study compared various production data before and after the powerful mixer was put into use.The results show that after the powerful mixer was put into use,the daily output of sinter ore increased significantly by 442 tons;the solid fuel consumption decreased significantly,with a reduction of 0.28 kg per ton of sinter ore.In the blast furnace ironmaking process,the application of the powerful mixer also achieved remarkable results.The amount of return fines per ton of iron decreased by 9.10 kg,and the comprehensive coke ratio decreased by 0.11 kg/t.Overall,the application of the powerful mixer has achieved a double improvement in the output and quality of sinter ore,effectively reduced production costs,and optimized the operation indicators of the blast furnace,the annual comprehensive benefit is approximately 3.2232 million Yuan.

Abstract:In the face of the decline in the quality of the original fuel,the Lai Steel 3 200 m3 blast furnace is optimized from the aspects of the scum system,the scum iron discharge,the blast furnace heat system,and the fabric system,and formulated a complete control model.In the case of low magnesium and large residue ratio,the fuel ratio reaches 505 to 510 kg/t,and has achieved good economic and technical indicators.

Abstract:This paper summarizes the process of blowing out,blowing in,and rapid production recovery after restarting the No.3 blast furnace at the ironmaking plant of Shiheng Special Steel.Key operational techniques,parameter controls,and management measures during the blow-out and blow-in phases are elaborated.Practical experiences in blow-out preparation and operations,furnace lining spraying,selection of blow-in parameters,and operational rhythm control are highlighted.Optimization directions are also discussed.

Abstract:Based on the production conditions of Shiheng Special Steel,this study analyzes the influencing factors of using low calorific value gas for calcination in a double chamber vertical kiln,formulates reasonable calcination processes,improvement measures,and innovative technologies.And stable and smooth operation of the double chamber vertical kiln was achieved.Full production capacity and the desired results were reached.

Abstract:A pilot study on electrodialysis concentration of reverse osmosis concentrated water from Taishan Steel was carried out.The results show that electrodialysis(ED)has an ideal concentration effect on the concentrated brine of steel industry,and can achieve high concentration of the concentrated brine conductivity,the concentration multiple is 5～10 times,the fresh water conductivity of ED is less than 3 000 μs/cm.The concentration effect of ED on salt water was affected by different ions in water.The concentration effect of ED on COD is not obvious,and ED has a certain ability to resist organic pollution.During the test,the ED energy consumption was 2.3-2.4 kWh/t,and the concentrated water system recovery is more than 85％,which was conducive to realizing the reduction of concentrated brine with low energy consumption and high efficiency,and provided a feasible direction for further implementation of zero waste water discharge.

Abstract:Through the analysis of the measurement system across the entire process of coke thermal performance testing,it is identified that the control of coke sampling,the process of coke pelletizing,the particle size control of coke pellets,and the daily stability monitoring of coke testing equipment have significant impacts on the reproducibility of coke testing.It is necessary to strengthen the standardization of process operations to ensure that the quality of test results is under control.

Abstract:In this paper,the determination of reference materials in acetone by Gas chromatography was studied.The method was validated by changing the inlet temperature,the split ratio and the temperature-programmed conditions.It is confirmed that the method has a good precision and linearity with a small random error and a relative standard deviation of less than 2%,it can be used as the analysis method of homogeneity test and stability test for the reference material of herbicide solution in acetone.

Abstract:The 1#5 100 m3 blast furnace of Shandong Iron and Steel started operation in December 2017,and after the furnace started,it experienced a situation of"low production and high consumption".The blast furnace aims to increase production and reduce consumption.By adopting measures such as optimizing the loading system,improving the activity of the furnace cylinder,and increasing the stability of the molten iron[Si],the two streams of air in the blast furnace are smooth,the furnace shape is regular,and the blast furnace achieves efficient production with increased production and reduced consumption.Since the fourth quarter of 2023,the technical and economic indicators of the 1#5 100 m3 blast furnace have improved significantly.In December 2023,the average blast furnace air volume of 7 750 m3/min has reached the best level in history,and the utilization coefficient has been increased from 1.90 t/(m3·d)to 2.22 t/(m3·d).The coke ratio was decreased to 345 kg/t from 371.5 kg/t in the first half of the year.

Abstract:The EPK series electric CNC screw press is an advanced mechanical equipment,but its dynamic characteristics and accuracy are significantly affected by the clearance of the kinematic pair.A kinematic pair is a mechanism in a mechanical system that allows two or more components to move relative to each other.The gap will cause mechanical vibration and reduced accuracy.Based on advanced finite element analysis and multi-body system dynamics software,this paper studies the impact of the kinematic pair clearance on mechanical dynamic performance in the EPK series electric CNC screw press.Research results show that the size of the kinematic gap directly affects the mechanical motion accuracy and the natural frequency of the system,which in turn affects the dynamic response and processing accuracy of the entire machine.