415 results about "Ferrous metallurgy" patented technology

The invention relates to the technical field of ferrous metallurgy, and discloses a non-deslagging converter steelmaking method which comprises the following steps: step 1, establishing a slag-steel interface stability analysis model, and analyzing the stability of a slag and molten steel interface under the action of a gravity field, oxygen blowing gas flow and temperature gradient, including slag density, molten steel density, interfacial tension and oxygen blowing flow rate, so as to obtain a slag-steel interface stability analysis model; calculating the amplitude and wavelength of an interface; and 2, based on the interface disturbance physical parameters obtained in the step 1, optimizing oxygen blowing process parameters of the top-blowing spray gun, adjusting the oxygen blowing angle of the spray gun to be in the range of 15-25 degrees, and controlling the oxygen flow rate to be in the range of 600-700 Nm < 3 > / h. By establishing a slag steel interface stability analysis model and adopting a multi-field coupling theory of a gravity field, an oxygen blowing gas flow and a temperature gradient, the amplitude, the wavelength and the disturbance growth rate of interface disturbance are quantitatively analyzed, accurate prediction and optimal control of dynamic behaviors of the slag steel interface are achieved, and the effect that the interface is kept stable in the steelmaking process is achieved.

The invention relates to the technical field of non-ferrous metallurgy, and discloses a dissolution method of high-iron-monohydrate-boehmite type bauxite. The method comprises the following steps: (1) preparing mixed ore pulp from high-iron monohydrate bauxite, sodium aluminate circulating mother liquor and an additive; the additive is one or a mixture of more of organic alkali, carboxylic acid and amino acid; (2) the mixed ore pulp is subjected to ultrasonic treatment and then heated to 190-280 DEG C for a dissolution reaction, dissolution slurry and dissolution residues are obtained, the dissolution residues are subjected to magnetic separation and recovery, and iron ore concentrate is obtained; the power of the ultrasonic treatment is 200 to 300W, and the time of the ultrasonic treatment is 30 to 50 minutes. According to the method, the problem that iron minerals are difficult to separate due to silicon minerals in the dissolution process of the high-iron monohydrate bauxite is solved. The method is simple in process, low in production cost, low in equipment requirement and good in industrialization prospect.

The invention discloses a steel ladle tipping transport vehicle and a hot repair method, and belongs to the technical field of continuous casting of ferrous metallurgy. The steel ladle tipping transport vehicle comprises a vehicle body, a tipping saddle and a rotating arm oil cylinder, the front part of the tipping saddle is hinged to the vehicle body, so that the tipping saddle is convenient to overturn; the output end of the rotating arm oil cylinder is hinged to the middle of the tipping saddle to provide tipping force. The tipping saddle is provided with a clamping groove with an upward notch, and the notch is matched with steel ladle seats on the two sides of the steel ladle in shape, so that the tipping saddle and the steel ladle seats are clamped conveniently. In the specific use process, the clamping groove is connected with the steel ladle base in a clamped mode, the tipping saddle stably bears the steel ladle and drives the steel ladle to synchronously transport and roll over, the tumbler oil cylinder enables the steel ladle to roll over, the vehicle body bears the steel ladle to move between the hot repair station and the molten steel receiving span, transportation and hot repair operation of the steel ladle on the vehicle body are achieved, safety and reliability are achieved, use of a crown block is reduced, and working efficiency is improved. The technical problems that the molten steel receiving span temperature is high, the working environment is poor, the hoisting travel is long and the safety is low during hot repair of an existing steel ladle are solved.

The invention belongs to the technical field of ferrous metallurgy, and relates to high-grade hydrogen transmission pipeline steel and a preparation method thereof.The high-grade hydrogen transmission pipeline steel is prepared from, by mass, 0.02%-0.04% of C, 0.20%-0.30% of Si, 1.20%-1.30% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.0010% of S, 0.015%-0.055% of Alt, smaller than or equal to 0.0020% of N, smaller than or equal to 0.0010% of O, smaller than or equal to 0.0001% of H, 0.90%-1.00% of Cr, 0.40%-0.50% of Mo, 0.020%-0.030% of Ti, 0.05%-0.07% of Nb, 0.40%-0.50% of Ni and the balance iron and inevitable impurities; various performance indexes, especially hydrogen induced crack resistance indexes, of the composite material are outstanding, CSR is equal to 0, CLR is equal to 0, CTR is equal to 0, slow tensile IRA and IEL are smaller than or equal to 20% in a solution A, KIH of a stepped compact tensile sample is larger than or equal to 100 MPa.m < 1 / 2 > in a 6.3 MPa pure hydrogen environment, and the fatigue life is larger than or equal to 500,000 times; according to the method, the technical problems in the research and development process of the steel material for the hydrogen conveying pipeline are solved, the technical scheme is relatively simple and easy to implement, the obtained product is high in performance stability and controllable in cost, and popularization and application in long-distance, large-scale and safe conveying pipeline construction of high-pressure hydrogen are facilitated.

The invention relates to the technical field of ferrous metallurgy, in particular to a production and manufacturing method of a low-cost high-elongation 600MPa-grade steel plate, which is characterized in that raw materials comprise the following chemical components in percentage by weight: 0.111 to 0.173 percent of C, 0.13 to 0.43 percent of Si, 1.325 to 1.565 percent of Mn, less than or equal to 0.018 percent of P, less than or equal to 0.008 percent of S, 0.020 to 0.060 percent of Alt, 0.0225 to 0.0435 percent of Nb, less than or equal to 0.0070 percent of N and the balance of Fe; the manufacturing method comprises the following steps of top-bottom combined blown converter, LF refining, VD vacuum refining, slab continuous casting, two-stage controlled rolling and subsection cooling.

The invention provides a method for measuring the width of a casting blank by an industrial CCD (Charge Coupled Device) based on AI (Artificial Intelligence), belongs to the technical field of casting blank width measurement, can overcome the problems of low measurement precision, easiness in environmental influence and the like in the prior art by combining an industrial CCD measurement technology with an AI model, and provides a casting blank width measurement method which is more accurate and stable. According to the method, the accuracy and efficiency of measurement can be improved, the dependence of manual operation can be reduced, and the error rate is reduced, so that the requirement of the ferrous metallurgy industry on high-precision measurement is met. In addition, the method is also suitable for other industrial fields requiring high-precision measurement, and has a wide application prospect.

The invention belongs to the field of ferrous metallurgy, and particularly relates to a method for improving the quality of a continuous casting billet through ultrasonic waves. According to the method, a multi-directional focused ultrasonic field and solidification front edge dynamic regulation and control combined mode is adopted, and electromagnetic stirring phase difference control and cooperative control of a secondary cooling section (fan-shaped section) auxiliary ultrasonic vibrator are combined at the same time. Wherein the composite action mode of the longitudinal standing wave field and the transverse traveling wave field of the multidirectional focused ultrasonic wave field and the solidification front edge dynamic regulation and control mode act on the casting blank, so that the equiaxed crystal rate can be remarkably increased, and the combination of ultrasonic waves and electromagnetic stirring is beneficial to reducing the segregation degree of the casting blank; and the addition of nano aluminum oxide and magnesium oxide mixed particles in the casting powder is beneficial to improving sound wave conduction so as to reduce subcutaneous bubbles. The isometric crystal rate of the finally obtained continuous casting billet is increased to 30%-55%; the center segregation index of the finally obtained continuous casting billet is reduced to 1.05 or below; and the number of subcutaneous bubbles per square meter is less than 0.5.

The invention relates to a process for preparing a phosphor copper rod by using a phosphonate-amide composite purifying agent as a quenching aid, and belongs to the technical field of non-ferrous metallurgy. Phosphorus pentoxide and sodium carbonate are mixed and decocted into fused salt, the fused salt is cooled and ground and then added into a corundum crucible together with scrap copper to be rapidly heated, compressed air is blown in, and slagging-off is conducted after heat preservation and standing; blowing mixed gas into the melt for reduction refining; adding calcium boride into the melt for refining; the refined copper liquid is subjected to continuous casting and continuous rolling; rapidly immersing the phosphorus copper rod subjected to continuous casting and rolling into a quenching aid solution, and carrying out quenching treatment; and the quenched phosphor copper rod is blow-dried and dried, and the high-conductivity phosphor copper rod is obtained. The high-purity phosphorus copper rod prepared by the method is excellent in key indexes of copper content, phosphorus content and conductivity, and meets the expected requirements of high purity and high conductivity.

The invention relates to the technical field of ferrous metallurgy, in particular to a high-strength extremely-low-temperature welding material wire rod and a manufacturing method and application thereof.The manufacturing method comprises the steps that molten steel smelting is conducted according to chemical components and percentages of the high-strength extremely-low-temperature welding material wire rod, a square billet is manufactured in a forging and rolling mode after die casting, the square billet is heated and subjected to heat preservation for 4.5-6 h, and then the square billet is rolled into a first-diameter wire rod; cooling after rolling, uncoiling a wire rod, reducing the diameter from a first diameter to a second diameter through three times of drawing, annealing, reducing the diameter from the second diameter to a third diameter through three times of drawing after annealing, and finally performing finish drawing to a fourth diameter. The high-manganese steel liquid hydrogen storage tank welding material can be used for producing the high-manganese steel liquid hydrogen storage tank welding material, is matched with high-manganese steel welding and is good in forming, the content of Mn in formed weld metal is 24-28 wt%, the situation that due to large-range diffusion of the manganese element, the structure and performance near a fusion line are greatly different is avoided, and the extremely-low-temperature service mechanical performance of the weld metal is guaranteed.

The invention provides a method for improving the reduction performance of pyrolytic carbon in biological sludge and application of the pyrolytic carbon in reduction of steel dust and sludge, and aims at solving the problems of high energy consumption and high carbon emission of a traditional reducing agent in the steel industry and promoting efficient utilization of biomass resources in the field of steel and iron metallurgy. The method comprises the following steps: extracting biological sludge carbon through a toluene solvent to remove oil, and deashing through a sulfuric acid solution, so that the adsorption capacity and catalytic performance of the biological sludge carbon are enhanced, and the reduction efficiency of the biological sludge carbon in the ferrous metallurgy process is improved. The biological sludge carbon subjected to dust removal and oil removal treatment has the specific surface area of 159 m < 2 > / g, the pore volume of 0.14 cm < 3 > / g and the average pore size of 3.4 nm, the specific surface area is remarkably increased, the metallization ratio after the reduction reaction is also greatly improved, and the effectiveness of the method in the aspect of improving the reduction performance of the biological sludge carbon is proved. The carbon emission of the iron and steel industry can be reduced, and powerful support is provided for sustainable development of the iron and steel industry.

The invention belongs to the field of ferrous metallurgy, and discloses an RH refining oxygen blowing decarburization method which comprises the following steps: dynamically adjusting the oxygen blowing flow and the oxygen blowing lance position according to the ratio of the content of carbon to the content of oxygen in RH incoming steel; the oxygen blowing amount is determined according to the initial values of the carbon and oxygen contents in the RH entering steel and the target values of the carbon and oxygen contents after decarburization is finished; a gradient lifting gas flow system is adopted in the RH decarburization process, the oxygen blowing opportunity of RH decarburization and the vacuum pressure in the oxygen blowing process are controlled, and when RH decarburization is finished, molten steel is controlled to be low in oxygen activity. According to different RH entering molten steel components, the oxygen blowing flow and the oxygen blowing lance position are dynamically adjusted, the gradient gas flow increasing system is adopted, the RH decarburization oxygen blowing opportunity, the oxygen blowing process vacuum pressure and decarburization ending molten steel oxygen activity control are combined, the oxygen utilization rate can be effectively increased, the decarburization period is shortened, and the decarburization efficiency is improved. The problem of molten steel recarburization caused by molten steel splashing due to too violent carbon-oxygen reaction is solved, RH efficient decarburization is achieved, the steel ladle top slag oxidability is reduced, and the molten steel cleanliness is improved.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a uniform slag adding device for a remelting electroslag furnace, which comprises a feeding device, the feeding device comprises a moving trolley, the top of the moving trolley is fixedly connected with a storage bin, the middle of the moving trolley is fixedly connected with a conveying pipe, and the conveying pipe intermittently rotates through a first rotating column; the expansion air bag gradually expands to exert pressure on the materials, a bridging structure formed by adhesion between the materials can be effectively damaged, meanwhile, the expansion air bag always keeps a certain expansion state within the interval period of the two times of inflation actions, the materials are continuously extruded, and therefore the materials can be continuously inflated. The continuous extrusion can prevent the materials from forming bridging again during the inflation interval, so that the bridging phenomenon is more effectively solved, smooth flowing of the materials is guaranteed, the problems of blockage and the like caused by bridging are avoided, the whole material conveying continuity is guaranteed, and the situation that feeding is uneven due to the bridging phenomenon is avoided.

The invention discloses a method for compositely stirring and melting iron materials, and belongs to the field of electric furnace metallurgy in ferrous metallurgy. Specifically, firstly, a bottom blowing stirring device of the electric furnace is arranged, and the mounting angle of a stirring head base body and a lower base plate is changed; meanwhile, a furnace wall oxygen lance or a burner or a carbon spraying gun side blowing device of the electric furnace is arranged, and the installation angles of the water cooling base body and the rear base plate in the horizontal direction are changed, so that the molten steel and the slag form rotating circulation. Aiming at solid iron materials, the shape and the number of the charging articulated chutes are changed, so that the direction of adding the solid iron materials into molten steel is changed to impact a molten pool, and the molten steel and slag form rotating circulation. When the electrodes of the electric furnace are heated, an electromagnetic field of direct current or alternating current generates Lorentz force, so that molten steel and slag in a molten pool form rotating circulation. And finally, the rotating directions of four kinds of circulation formed by bottom blowing, side blowing, solid iron material flow and electromagnetic stirring are kept consistent, and under the heating action of electrodes, composite stirring and solid iron material melting are strengthened, so that the problem of iron material bonding is solved.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for determining dissolution kinetics of solute in metallurgical slag based on molecular dynamics simulation, compared with a traditional experimental method, molecular dynamics simulation does not need a large number of thermal state experiments and complex detection modes, and large-scale simulation calculation can be rapidly completed on a computer. And meanwhile, various different conditions can be simulated in a short time, and superior processes and slag systems can be quickly screened out. According to the method, the reaction which is difficult to observe clearly can be visualized, the atomic trajectory behavior of the dissolution behavior, the dynamic change, the dispersion process of the solute and the like are provided, rich and accurate information is provided for research on dissolution kinetics, and the dissolution rule and the structure evolution mechanism of the solute in the high-temperature melt can be revealed. In addition, the method is high in safety, and danger possibly brought by a high-temperature experiment is avoided.

The invention discloses a process for extracting high-purity vanadium pentoxide from ammonium polyvanadate, and belongs to the technical field of nonferrous metallurgy. According to the process, efficient purification of vanadium pentoxide is achieved through the steps of sodium hydroxide dissolution, pH adjustment, gradient impurity removal, precise filtration, freezing-unfreezing circulation, high-purity water washing, centrifugal dewatering, two-stage firing and the like. In the process, the gradient impurity removal technology effectively reduces the content of impurities such as iron, sodium and the like, the precision filtration system ensures low residue of the impurities, the freezing-unfreezing circulation step further improves the crystal purity, and the two-stage firing process realizes directional conversion of the alpha-V2O5 crystal form. The purity of the obtained vanadium pentoxide product reaches up to 99.99% or above, the Na < + > content is smaller than or equal to 2 ppm, the Fe residue is smaller than or equal to 5 ppm, the alpha-V2O5 crystal form proportion is larger than or equal to 98%, the problems that in a traditional process, deep impurity removal is difficult, the product purity is insufficient, and crystal form conversion is incomplete are remarkably solved, and an effective technical approach is provided for preparing high-purity vanadium pentoxide.

The invention discloses a production method for reducing flaw detection defects of wind power gear steel, and belongs to the technical field of ferrous metallurgy. According to the method, an electric furnace-LF-VD-continuous casting process route is adopted, the mass fraction of an aluminum element Al in molten steel is controlled to be not lower than 0.018% in the LF refining process, and the mass fraction of [Al] is controlled to be higher than 0.010% all the time in the VD vacuum treatment process. And after VD vacuum breaking, aluminum is supplemented in time, the mass fraction of Al is increased to 0.015%-0.020%, calcium treatment is reasonably carried out, and the mass fraction of Ca in molten steel is controlled to be 0.0006%-0.0009%. By accurately controlling the component change of the molten steel in the VD process, the formation of CaO-MgO-Al2O3-SiO2 inclusions with high SiO2 content is effectively inhibited, the large-size ultrasonic flaw detection defects in the wind power gear steel are remarkably reduced, and the internal quality of the steel is improved. The method is simple in process and remarkable in effect, and has a good industrial application prospect.

The invention discloses a method for establishing a strip steel buckling phenomenon prediction model in a continuous annealing process, which relates to the technical field of ferrous metallurgy and comprises the following steps: acquiring parameters of a strip steel heating section and a soaking section in the continuous annealing process; the parameters comprise equipment parameters and process parameters; constructing a strip steel transverse temperature distribution model; constructing a strip steel yield stress model; constructing a strip steel tensile stress distribution model; constructing a strip steel transverse pressure stress distribution model; constructing a strip steel buckling wrinkle criterion; correcting a model coefficient based on field measured data; according to the method, the strip steel operation process of the heating section and the soaking section is divided into different research units and strip steel bar elements, the whole-process strip steel buckling phenomenon prediction in the continuous annealing process can be achieved, and the real condition of strip steel buckling under the thermal-mechanical coupling effect in the continuous annealing process can be reflected more accurately and more reliably.

The invention discloses a method for refining and homogenizing crystal grains of a 9%-12% Cr steel thick-wall large forge piece, and belongs to the field of ferrous metallurgy. According to the method, the large forge piece is heated to be close to the critical point of the complete austenitizing temperature in a stepped mode, the large forge piece is subjected to heat treatment by regulating and controlling dispersive precipitation of carbides in an initial structure and uniform nucleation of austenite and / or introducing a small amount of undissolved ferrite, residual precipitated phases and multi-phase interfaces and controlling the cooling speed; nucleation particles of pearlite transformation in the vibration heat preservation process are remarkably increased, uniform distribution of granular pearlite in the supercooled austenite is promoted, structural inheritance is cut off and eliminated, and the purpose of grain refining and homogenizing after performance heat treatment is achieved. According to the method, the grains of the thick-wall large forge piece are refined to 5 grades or above, the cross section grain size difference is within 2 grades, a series of problems that in the production process, grass waves exist in ultrasonic flaw detection, the grain size is unqualified, and the low-temperature impact toughness does not reach the standard can be solved, the product percent of pass and the production efficiency are remarkably improved, and meanwhile the production energy consumption is reduced.

The present invention relates to the technical field of ferrous metallurgy, and in particular to an S420-grade marine steel and a production method therefor. The S420-grade marine steel comprises the following chemical components in mass percent: C: 0.05%-0.09%, Si: 0.10%-0.30%, Mn: 1.30%-1.60%, P: ≤0.015%, S: ≤0.003%, Nb: 0.020-0.040%, V: 0.020-0.050%, Ti: 0.008-0.030%, Cr: 0.10-0.30%, Ni: 0.10%-0.30%, Mo: 0.10-0.20%, Cu: ≤0.0:50%, Al: 0.020%-0.050%, B: ≤0.00050%, Ca: 0.0006%-0.0030%, N≤0.0050%, H≤0.0002%, and the balance Fe and inevitable impurities. The present invention uses the design of low-carbon combined fine grained strengthened alloy and the technology of clean steel smelting combined with heavy reduction casting to improve the core structure of casting billets, and uses a controlled rolling and controlled cooling process to achieve a structural form dominated by bainite, satisfying product requirements for welding, impact at -40 degree and CTOD performance.

The invention discloses a technological method for regulating and controlling the melting point and viscosity of aluminum deoxidized steel refining slag based on rare earth cerium, and belongs to the technical field of ferrous metallurgy refining. The redox characteristic of Ce and slag system structure modification are combined, the limitation of traditional single component adjustment is broken through, and the composite oxide effect of Ce is utilized: Ce generates CeO2 and Ce-Al-O composite oxide at high temperature, so that the liquidus temperature of a slag system is remarkably reduced, and the melt structure is optimized; by limiting the addition amount of Ce and balancing the cost and performance, the situation that the oxidability of a slag system is out of control due to excessive Ce is avoided, and the thermodynamic stability of the slag system is improved; the addition of Ce inhibits the generation of high-melting-point calcium aluminate and promotes the formation of a low-melting-point phase; by adding Ce, melting point reduction, viscosity optimization and molten steel purification are achieved at the same time, the additive is superior to an existing single-function additive, traditional fluorite is replaced, and fluorine pollution is reduced. The invention aims to provide the same environment-friendly and efficient method capable of accurately regulating and controlling the physicochemical properties of the slag.

The invention provides a strip steel hot continuous rolling industrial process monitoring method and device, and relates to the technical field of ferrous metallurgy industrial process monitoring. The method comprises the following steps: an off-line modeling stage: collecting multi-dimensional sensor data in the strip steel hot continuous rolling industrial process for standardized cleaning; carrying out data enhancement on the cleaned data by adopting DDIM; random shielding is carried out by using a feature focusing cooperation mechanism based on random shielding; constructing an unsupervised process monitoring model, and training the constructed unsupervised process monitoring model by using the data after the shielding operation; processing data reconstructed by the trained unsupervised process monitoring model by adopting a kernel density estimation method, and determining a control limit; and an on-line monitoring stage: judging whether the current sample is normal or not by using the control limit to realize abnormal working condition detection. By adopting the method, the monitoring sensitivity of the strip steel hot continuous rolling industrial process can be improved.

The invention discloses a method for recovering lithium in lithium clay, and belongs to the technical field of non-ferrous metallurgy. The method comprises the following steps: carrying out mechanical activation pretreatment on lithium clay to obtain mineral powder; the mineral powder is subjected to acid leaching and solid-liquid separation, and leaching residues and lithium-containing leaching liquid are obtained; performing sectional aluminum removal on the lithium-containing leachate to obtain aluminum-removed liquid; and removing iron and magnesium in the molten aluminum, and then adding a precipitant to carry out lithium precipitation reaction to obtain lithium carbonate. According to the method, the lithium leaching efficiency is improved by creatively utilizing ion replacement and mineral lattice destruction, deep removal of aluminum impurities is achieved by combining ammonium / potassium alum directional crystallization, the comprehensive lithium recovery rate exceeds 78% (the comprehensive lithium recovery rate can exceed 85% in a part of schemes), meanwhile, ammonium alum and potassium alum with the purity higher than 95% are produced as byproducts, and the method is suitable for industrial production. And an efficient, low-consumption and environment-friendly solution is provided for industrial development of carbonate type lithium clay ore.

The invention provides an LF-RH duplex process calcium treatment method, and belongs to the technical field of steelmaking production in the ferrous metallurgy industry. The method comprises the following steps that after molten iron is pre-desulfurized, converter smelting, LF refining and RH refining are sequentially carried out, in the RH refining process, high-calcium wires are fed for calcification treatment, and the calcium treatment process is completed. Compared with the prior art, the LF-RH duplex process calcium treatment method provided by the invention adopts specific process steps and conditions to realize better overall interaction: by determining the optimal calcium treatment opportunity, the inclusion control level of the molten steel is improved, and clean production of the molten steel is realized. Experimental results show that calcium treatment is carried out in the RH procedure, the inclusion level in the molten steel is reduced, stable production of high-quality steel is achieved, under the condition that the hydrogen content is basically consistent, the effect of reducing the inclusion in the molten steel is good, and the cleanliness of the molten steel can be improved.

The present invention belongs to the field of ferrous metallurgy, and relates to an EH40 crack arrest steel plate for a container ship and a manufacturing method therefor. The steel plate comprises the following chemical components in percentages by mass: C: 0.03-0.06%, Si: 0.15-0.30%, Mn: 1.10-1.30%, P≤0.0080%, S≤0.0030%, Nb: 0.010-0.020%, V: 0.035-0.055%, Ti: 0.008-0.020%, Ni: 0.45-0.65%, Cu: 0.10-0.30%, Ca: 0.0005-0.0020%, H≤0.00015%, Ceq≤0.42%, and the balance of Fe and inevitable impurity elements. The steel plate has a yield strength of 409-440 MPa, a tensile strength ranging from 595 MPa to 625 MPa, a yield ratio of 0.84-0.88, and a longitudinal impact toughness value at -60ºC of greater than or equal to 250 J; and during instrumented impact testing, the energy E3 for crack arrest / unstable propagation and the absorbed energy E4 after crack arrest / unstable propagation account for more than or equal to 20% of the total impact absorption energy, and therefore the steel plate has good crack arrest performance.

The invention provides a method for determining boron element in iron ore, which comprises the following steps: weighing 0.2 g of sample, uniformly mixing with a flux, heating to red at 700-800 DEG C, cooling, adding sodium peroxide for secondary melting, dissolving in water, and transferring to a beaker; adding ethanol to boil, fixing the volume to 500mL, filtering and taking 100mL, adjusting the pH value, adding hydrogen peroxide to slightly boil, cooling, adding barium carbonate to boil, diluting and filtering, and taking 25mL for color development determination. According to the method, sodium carbonate and / or potassium carbonate and sodium peroxide are adopted to form a composite flux, an iron ore sample is completely decomposed through secondary melting and step-by-step dissolution, and the sample decomposition efficiency is improved; the method is stable in recovery rate, is superior to a conventional method in precision, can accurately measure the boron content in the iron ore, meets the technical requirements on boron element detection in the fields of ferrous metallurgy, geological exploration and the like, provides an efficient and reliable detection means for boron content analysis, and ensures the accuracy and reproducibility of a detection result.

The invention relates to a method for preparing rare earth steel by refining prefabricated slag of a CaO-Al2O3-REO-MgO slag system, belongs to the technical field of ferrous metallurgy, and solves the technical problem of how to prepare the rare earth steel by refining the prefabricated slag of the CaO-Al2O3-REO-MgO slag system so as to improve the rare earth yield. The invention discloses a method for refining and preparing rare earth steel by using prefabricated slag of a CaO-Al2O3-REO-MgO slag system. The method comprises the following steps: S1, paving a deoxidizing agent, the prefabricated slag and lime at the bottom of a steel ladle before tapping, and tapping; s2, slag adjustment operation of the LF furnace; step S3, alloying is carried out; s4, treating white slag for more than or equal to 20 minutes, and performing calcium treatment; s5, argon blowing is carried out, and an LF furnace station is left; s6, RH treatment is carried out; s7, adding a rare earth iron alloy; s8, vacuum breaking is carried out after vacuum circulation, and the robot leaves the RH station; s9, a tundish covering agent is scattered on the surface of the molten steel; and S10, the surface of the molten steel is protected through continuous casting crystallizer casting powder. The yield of the rare earth elements is 40% or above.

The invention relates to an RH vacuum tank system and a combustion heating operation method, and belongs to the field of ferrous metallurgy vacuum treatment equipment. The system comprises a vacuum tank, a hot bent pipe, a top lance device, a vacuum air pump system and an automatic control system, the hot bent pipe is connected with the vacuum tank, and an automatic ignition device, an infrared temperature measuring device, a video monitoring device and a thermocouple are integrated in the hot bent pipe; the top lance device is of a water-cooling multi-layer sleeve structure, multiple stations are switched through a top lance rotating frame and a lifting trolley, and vacuum sealing is maintained. The method is based on multi-sensor cooperative control, low-temperature ignition, high-temperature spontaneous combustion and molten steel heating modes are automatically executed according to the temperature of a refractory material at the bottom of a tank and the temperature of molten steel, and combustion stability is ensured by dynamically adjusting the flow of fuel gas and oxygen. According to the scheme, through closed-loop ignition control, inert gas protection and intelligent monitoring, the safety is remarkably improved, and the gas explosion risk is avoided; full-automatic operation and precise temperature control are combined, the molten steel quality and the production efficiency are improved, and the device is suitable for refining production of high-value-added steel such as silicon steel and automobile sheets.

The invention discloses a tempering process steel temperature forecasting model based on a total element driven fusion mechanism and construction and application of the tempering process steel temperature forecasting model, belongs to the field of tempering furnace optimization control of ferrous metallurgy, is used for enabling the steel temperature forecasting model to have interpretability, physical significance and extrapolation and have higher accuracy, and has the key points that a training data set is obtained; wherein the input data of the tempering process steel temperature forecasting model in the training data set is tempering furnace operation data, and the output data is the total heat absorption rate; and training the tempering process steel temperature forecasting model by the training set. Wherein the total heat absorption rate is obtained through the steps of establishing an identification target function with the total heat absorption rate as the core, identifying the target function through an improved GSK algorithm and the like, the accuracy and robustness in the face of new data are enhanced, and the discomfortability challenge in inverse problem solving in the field of steel temperature forecasting is effectively solved.

The invention relates to the technical field of ferrous metallurgy, and discloses a converter molten iron judgment method and device, a storage medium and computer equipment.The converter molten iron judgment method comprises the steps that firstly, original molten iron data are obtained and preprocessed, an original data set is constructed, and then molten iron category labels are added to part of data in the original data set according to a preset molten iron category division rule; the method comprises the steps of obtaining a target data set, constructing a graph convolutional network based on the target data set, training and testing the graph convolutional network by using the target data set, generating a graph convolutional neural network model, and finally judging the collected to-be-detected molten iron data by using the graph convolutional neural network model to obtain a molten iron judgment result. According to the method, the type of the molten iron can be judged before smelting is started, then pre-judgment and early warning of dangerous accidents possibly generated in actual production are achieved, the casualty rate caused by splashing and dry returning accidents in the actual production can be reduced, corresponding economic losses are reduced, and production safety is improved.

The invention belongs to the technical field of ferrous metallurgy and material modification, and particularly relates to a preparation method of green short-process hot work die steel, which comprises the following steps: obtaining scrap steel, adding alloy, and smelting to obtain molten steel; the molten steel is refined through fluoride-free rare earth refining slag, and refined molten steel is obtained; adding a nanoparticle modifier into the refined molten steel to obtain modified molten steel; and the modified molten steel is subjected to continuous casting or die casting, and the hot work die steel is obtained. According to the method, the fluorine-free rare earth slag refining and nano particle modification combined technology is adopted, fluorine-containing refining slag and traditional electroslag remelting are effectively replaced, power consumption and carbon emission in the smelting process are reduced, the technical development requirements of current green manufacturing and dual-carbon targets are met, and green short-process manufacturing of the hot work die steel is achieved; and the prepared hot work die steel has higher cleanliness, a more uniform organization structure and more excellent thermal fatigue performance.