Abstract:The sources of steel slag,chemical composition,mineral composition,expansive pulverization and some other properties of steel slag are reviewed in this paper.In addition,various slag treatment processes are introduced as well.On this basis,the research and utilization state of converter slag at home and abroad is described.According to the shortcomings of steel slag treatment in our country,it is pointed out that the new technology of steel slag treatment with pressure heat tightness is expected to solve the problems of steel slag stability,grindability and other aspects.

Abstract:The boiling point of sulfur dioxide under normal pressure is-10℃,which is not significantly different from room temperature.Therefore,sulfur dioxide can be liquefied and separated through refrigeration to achieve the goal of reducing air pollution.The chimney flue gas generally has a high temperature,and the cooled cold air can be used as a low-temperature source to exchange heat with the high-temperature flue gas,forming a circulating cooling system and reducing the energy consumption of the refrigeration device.Comparing the refrigeration desulfurization process with the traditional baking soda dry desulfurization process,it is found through calculation that baking soda dry desulfurization is suitable for high-temperature flue gas and low sulfur content situations,while the refrigeration desulfurization process has obvious advantages in low flue gas temperature and high sulfur content situations.

Abstract:In order to meet the needs of high quality,low consumption and emission reduction in sintering production,a series of technical measures for improving quality and reducing consumption of 2 × 380 m2 sintering machine were adopted in masteel.Through continuous optimization of thick bed sintering production economic potential,the application and innovation management of many new energy-saving technologies,such as upgrading of ignition furnace,changing belt cooler into ring cooler,air leakage treatment of sintering machine,frequency conversion technology of large fan,etc.,the quality of sinter and energy saving have been improved remarkably,and the process energy consumption has been reduced from 55 kgce/t to 47 kgce/t.At the same time,the paper puts forward the improvement direction of the problems existing in the current high efficiency and low consumption production of 2 × 380 m2 sintering machine,so as to further promote the sustainable development of energy saving and emission reduction.

Abstract:As the CC and heating technologies were not changed,the influence was done over CC overheat temperature on the bearing steel GCr15 band structure adopting 2 spheroidized technology.It was found that the band structure grade of the spheroidized was the least which the test results were the grade 2.5,2.0,1.0 when the overheat temperature of CC was more than 30℃,the band structure grade of the spheroidized was the highest which the test results were the grade 3.5,3.0,2.5 when the overheat temperature of CC was between 22℃and 30℃and the band structure grade of the spheroidized was the second which the test results were the grade 3.5,2.5 when the overheat temperature of CC was less than 22℃.So the advice was put forward that the overheat temperature of CC was best controlled between 30℃and 40℃to production bearing steel GCr15 when the band structure grade was wanted for the smaller controlled.

Abstract:In order to solve the problem of nitrogen increase in the refining process,small-grained limestone is added to the ladle slag layer in advance,and the CO2 bubbles generated by decomposition are used to form a sealed isolation layer to reduce nitrogen increase.After the implementation,the nitrogen addition rate of the LF refining process was reduced from the original average of 4.55×10-6 to 3.25×10-6,and the proportion of≤5×10-6 of nitrogen was increased from 88.3%to 95.0%,which achieved significant control effects,thereby reducing the cost per ton of steel and improving the quality of molten steel.

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.

Abstract:This article takes the application of microalloyed steel organization performance control technology in a steel plant as an example,and analyzes mechanism of action,organization and performance whole process control technology of microalloyed steel.From seven core links of slab,heating,reduction,final rolling temperature,cooling rate,coiling temperature,and heat treatment,this paper tells in detail the key technology of microalloyed steel.

Abstract:To determine the determination of SiO2,CaO,MgO,S,P and other components in dolomite,the sample is automatically cooled into the sample box after the fourth set of national installation equipment-automatic weighing 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.The sample was determined by X-ray fluorescence spectrometer splice method instead of powder tablet method and silicon molybdenum blu-ray method to determine SiO2 and EDTA volumetric method to determine CaO and MgO.Under the premise of maintaining the accuracy of the result,the detection time was greatly shortened compared with the traditional conventional detection method,and the stability was also significantly improved because the glass splice was used.Through the development of dolomite automatic weighing melting system detection method real-time determination,the ratio of materials in dolomite,the output of hot metal has a very important guiding significance,but also to avoid the traditional chemical determination of process produced acid and alkali waste liquid pollution to the surrounding environment.

Abstract:This article describes using the mix melting agent and the sample into fusion sample at high temperature,we analyzed the four components of SiO2,CaO,MgO and Al2O3 in the sample by XRF,and high accurate analytical results were obtained.The method was applied to routine analysis of the blast furnace slag sample,the effect was ideal.

Abstract:By changing the cooling method of intermediate treatment,the influence of different intermediate heat treatment processes on the structure and properties of a cast nickel-based superalloy was studied.The results show that the test rod is cooled by water,air and furnace after intermediate treatment at 1 050℃×14 h.The mechanical results show that the three cooling methods have little effect on the elongation and section shrinkage after fracture,and all are at a low level.However,the tensile strength and yield strength of the test rod are gradually increased.

Abstract:In response to the increasing number of leaks in the later life cycle stage of the Angang gas pipeline network and the lack of online detection and alarm systems,a gas safety monitoring system for the pipeline network has been developed and applied.Power supplies,fixed CO alarms,wireless transmission devices,and data reception and monitoring devices have been installed at 91 locations.Since the system was put into operation,the efficiency of discovering and handling gas hazards has been significantly improved,thereby ensuring public safety in the gas production area.

Abstract:In the field of precious metal mold processing,the traditional hand-made mold cannot meet the production needs,and the current three-dimensional scanning technology plays an increasingly important role in the design,production,repair and inspection of precious metal mold.In the processing and production of precious metal products,precision molds can improve the accuracy and quality of new products,improve product competitiveness and bring considerable economic benefits to enterprises.Through the introduction and application of high-precision 3D scanning equipment in the market,the production efficiency can be improved,the cost can be reduced,the mold production level can be improved,and the production cycle can be shortened.