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:This study established an ICP-MS(Inductively Coupled Plasma Mass Spectrometry)method for the determination of 10 trace impurity elements(calcium,magnesium,aluminum,iron,cobalt,nickel,copper,zinc,arsenic,and lead)in high-purity germanium dioxide.By optimizing sample pretreatment conditions and instrument working parameters,matrix effects and polyatomic ion interferences were effectively eliminated.The results showed that the method exhibited a wide linear range for all 10 elements,with correlation coefficients greater than 0.999.The detection limits ranged from 1 to 10 ng/g,spike recoveries were between 85%and 115%,and the relative standard deviations(RSD)were less than 10%.This method is simple,rapid,accurate,and suitable for the determination of trace impurities in high-purity germanium dioxide.

Abstract:In order to solve the problem of low production efficiency of the heating furnace on the special-shaped production line of the section steel plant,this article applies management tools such as the energy consumption bridge and KAI to carry out on-site diagnosis.According to the site investigation,the main influencing factors include the damage of refractory of the furnace body resulting in heat dissipation and gas escape,improper control of furnace pressure and air-fuel ratio(KAI index),unreasonable sequence/stride of material,high billet weight,and excessive oxidation and burning loss.After taking measures such as repairing the furnace body refractory materials,optimizing furnace pressure and air-fuel ratio adjusting material loading parameters,and improving pipeline insulation,the coal consumption of the heating furnace has approached the design value of 1.38 GJ/t from 1.97 GJ/t,with an annual cost reduction and efficiency increase of about 1.066 million Yuan;the yield has increased by more than 0.14%,and the oxidation and burning loss has decreased by 0.3 percentage points,effectively improving the production efficiency.

Abstract:Analysis indicates that the high content of Al2O3 inclusions in steel,leading to nozzle clogging and subsequently causing slag entrapment in the mold,is the primary cause of peeling and gray streak-like defects in cold-rolled products.By increasing the hot metal ratio and implementing a heat compensation system,the endpoint hit rate of the converter improved from 78.3%to 90.6%.The application of ferrosilicon and carbon powder pre-deoxidation processes reduced the residual oxygen content in RH to 72×10-6.Dynamically adjusting the addition of modifiers and lime based on endpoint oxygen levels resulted in a decrease in the TFe content of RH top slag from 6.73%to 4.47%,with the Ca/Al ratio in the slag stabilizing within standard limits.After process optimization,the occurrence rate of peeling and gray streak-like defects in cold-rolled products decreased from 0.65%to 0.31%.

Abstract:The automatic temperature-measurement technology on the pusher rod is a major innovation in the modern coking industry.By installing temperature sensors on the pusher rod,the system monitors the temperature of the chamber wall in real time during the pushing process,providing continuous data for optimizing the heating regime and for furnace maintenance.It eliminates the high risk,discontinuous data and limited sampling associated with traditional manual measurements,and enables automated,intelligent and precise temperature monitoring of the coke oven.Based on practical application of this technology in a 7 m top-charging coke oven,the paper analyses and summarizes the value of automatic temperature measurement on the pusher rod.

Abstract:The causes and mechanisms of aluminum alloy adhesion for 3003 curtain wall panels were studied by metallographic observation,scanning electron microscopy(SEM),energy spectrometer(EDS)and other analytical detection and characterization methods.The results show that the annealing and sticking mechanism of aluminum strip 3003 curtain wall is correlated with the coarse grain structure and uneven distribution of the second phase in terms of microstructure.The unreasonable annealing process and the unreasonable design of the degreasing stage in the annealing process make the degreasing unclean is the key to sticking.Based on this,preventive and control measures such as precise control of annealing temperature,reasonable setting of holding time,improvement of furnace loading method,correct use of cold rolling lubrication conditions,and control of grain size of cast and rolled slabs to ensure the uniformity of curtain wall aluminum plate product structure are proposed.

Abstract:In order to solve the problems of low service life of refractory materials in steel ladles,large daily feeding quantities,large temperature drop of molten steel during the process,and steel infiltration on the slide plate,and to meet the overall goals and needs of efficient,low consumption,high-quality,and green development in steel production,wet automatic spraying technology is adopted,and the sliding water nozzle mechanism C1 and dispersed breathable seat brick technology are upgraded.The service life of the ladle pouring lining is increased to more than 240 heats,achieving multi furnace continuous use of the slide plate,The sliding of the skateboard has been increased to 4 times,and the comprehensive steel consumption per ton of magnesia carbon bricks,casting materials,and spray repair materials for the working lining of the ladle has decreased by 0.70 kg/t compared to the ordinary sleeve casting process.After the service life of the ladle has been improved,the number of new ladles online per month has been reduced by 16.67%,the frequency of ladle turnover has been increased,the average steelmaking temperature of the converter has been reduced by3℃.

Abstract:In view of the quality upgrading needs of photovoltaic bracket,which is lightweight,high-strengthening and green,the composition design of low carbon,low silicon and micro-titanium is adopted,combined with clean steel smelting control and controlled rolling and cooling technology,to play the role of Ti element precipitation strengthening,optimize the alloy based on the guarantee of good base metal performance,and successfully develop 500 MPa level.High strength hot rolled steel strip for high performance photovoltaic bracket with high surface quality,high extension,easy coating and other processing requirements.The structure of the steel strip is ferrite+pearlite,the yield strength is≥500 MPa,the tensile strength is≥540 MPa,and the elongation after breaking is≥25%.Meet the user's subsequent pickling,cold rolling,continuous annealing and other performance and process requirements,in line with the steel strip after hot galvanized aluminum magnesium surface without leakage plating,no leakage point surface quality requirements.

Abstract:In response to the problem of white bright bands appearing in the Ф310 mm 20 Steel continuous casting billets produced through the LD→LF→CC process,the cause analysis and process optimization were conducted.Through on-site production data statistics,it was found that the appearance of white bright bands was caused by the mismatch among the casting billet drawing speed,superheat,and secondary cooling intensity.When the superheat was high,the drawing speed was fast,and the liquid core was large,the stirring intensity of the CC end on the liquid core was large,and the probability of white bright bands appearing was high;when the superheat was low and the liquid core was small,the stirring intensity of the CC end on the liquid core was small,and the probability of white bright bands appearing was low.By adjusting the CC end stirring parameters from 220 A/7 Hz to 180 A/7 Hz,the white bright bands were basically eliminated.

Abstract:In response to the double-sided edge dross defect that occurred during the production of wide and thick hot-dip galvanized sheets on a certain steel plant's hot-dip galvanizing production line,the surface and cross-sectional morphology and composition of the dross were detected and analyzed through 3D morphology \ SEM&EDS.The results indicate that the dross at the edges of the wide and thick hot-dip galvanized sheet is connected to the steel plate substrate and is generated on the surface of the strip steel,rather than adhering to the surface as floating dross.Thick gauge strip steel has fast heat dissipation.When transitioning from narrow gauge to wide gauge steel,the low temperature area of the furnace roller edge of the annealing furnace causes a decrease in temperature of the wide gauge strip steel'edges.After entering the zinc pot,dross is easily generated at the edges of the strip steel.By using the induction heater at the equilibrium section of the annealing furnace outlet,increasing the temperature of the zinc pot plate,and arranging production reasonably,the dross at the edge of the wide and thick specification strip steel can be effectively improved.