123 results about "Liquid steel" patented technology

The application provides a crystallizer protection slag for casting high-hydrogen-content medium-carbon steel liquid steel and application thereof, wherein the chemical composition of the crystallizer protection slag has the following mass percentages: SiO2: 25-32%, CaO: 29-36%, Al2O3: 1-4%, MgO: 3-6%, Na2O: 7-12%, F: 6-10%, C 总 : 3-6%, MnO: 2-4%, Li2O: 0.5-1%, and the rest is other inevitable impurities. The crystallizer protection slag can significantly reduce the occurrence rate of crystallizer sticking alarm emergency speed reduction and the occurrence rate of leakage during continuous casting when used for casting high-hydrogen-content medium-carbon steel liquid steel. Thus, the high-hydrogen-content medium-carbon steel liquid steel can be directly subjected to continuous casting without additional dehydrogenation treatment, the production efficiency is improved, and the production cost is solved.

The invention discloses a molten steel component online detection method based on an LIBS technology and deep learning, and relates to the technical field of component online detection in the casting metallurgy process. The method comprises the following steps: acquiring one-dimensional spectral data of target molten steel through an LIBS-based light path excitation collection system, and preprocessing the one-dimensional spectral data to obtain a corresponding two-dimensional grey-scale map; inputting the two-dimensional grey-scale map into a trained molten steel component detection model, and outputting a multi-element content predicted value of the target molten steel; the molten steel component detection model is constructed based on an improved ResNet50 network. According to the invention, the light path excitation collection system is arranged based on the LIBS technology, and the light path excitation collection system is combined with the improved ResNet50 network, so that the detection efficiency and the detection precision of the molten steel components are effectively improved.

Method for producing liquid steel in an electric arc furnace with final decarburization The invention relates to a method for producing liquid steel in an electric arc furnace (2) comprising successively: - melting a metal load in the electric arc furnace (2) for generating a steel bath (10); - denitrogenating the steel bath (10) to reach a nitrogen content %N below a targeted nitrogen content %Ntarg, wherein the carbon content %C remains greater than a targeted carbon content %Ntarg; - applying a final decarburization treatment to reach a carbon content %C ≤ %%Ntarg, to reach an oxygen content %Op greater than 200 ppm, wherein oxygen is injected at a flow rate above 0.3 Nm3 / min / ton, the ambient air being at a pressure of above 90% of the atmospheric pressure; - tapping the steel bath (10), the oxygen content %Op reached by the final decarburization treatment being maintained up to the tapping.

The invention relates to a method for producing liquid steel in an electric arc furnace (2) comprising successively: - defining a targeted nitrogen content wt. %Ntarg of the produced liquid steel, - introducing a metal load in the electric arc furnace (2) and - melting it for generating a steel bath (10) and a slag (12); - carburizing the steel bath (10) by adding a carbon amount equal to or greater than a minimum denitrogenation carbon amount CdeN said amount CdeN being defined as a function of the nitrogen content in excess to wt. %Ntarg at the beginning of the step (E4), - injecting a flow of oxygen to reach a nitrogen content wt. %N such that wt. %N ≤ wt. %Ntarg, - tapping the steel bath (10) to obtain the produced liquid steel.

This invention discloses a method for controlling surface weld scar defects in large square billets of high-carbon chromium bearing steel, belonging to the field of metallurgical technology. For GCr15 steel, the method for controlling surface weld scar defects includes the following steps: molten steel enters the crystallizer, forming a solidified billet shell, and leaves the crystallizer under the action of a straightening machine. In the secondary cooling chamber, the molten steel is cooled by water spray, gradually solidifying into a large square billet. The protective slag addition rate is controlled at 58-60 g / min, the large billet drawing speed is 0.9-1.1 m / min, and the crystallizer cooling water flow rate is 142-144 m³ / min. 3 The above controls various parameters during the continuous casting process of high-carbon chromium bearing steel GCr15, ultimately reducing the surface weld scar defect rate of large billets to less than 1%. Compared with existing control methods, this significantly reduces the weld scar defect on the surface of GCr15 steel.

The utility model belongs to the technical field of steel slag treatment, and particularly relates to a device for recovering metal from steel slag through reduction. The device for recovering metal through steel slag reduction comprises a reaction tank and a vibration generating device, liquid steel slag to be subjected to reduction reaction is contained in the reaction tank, the reaction tank is arranged on the vibration generating device, and the vibration generating device drives the reaction tank to vibrate. According to the utility model, the reaction tank is arranged on the vibration generation device, so that fine iron powder obtained by a reduction reaction can be gathered into iron particles by adopting vibration treatment after the reduction reaction of liquid steel slag, and the larger the particles are, the lower the oxidation degree is, so that the reduction effect is guaranteed; the problem that the recovery rate is reduced due to the fact that metal iron is oxidized again in the follow-up treatment process is solved.

The application discloses a preparation method of a medium-high carbon steel hot-rolled coil and the medium-high carbon steel. The preparation method of the medium-high carbon steel hot-rolled coil comprises the following steps: slab continuous casting: medium-high carbon steel liquid steel is cast and drawn to obtain a slab, and a pre-descaling treatment is performed on the slab to reduce oxides on the surface of the slab, thereby obtaining a pretreated slab; slab heating: the pretreated slab is subjected to a heating treatment, and after the heating treatment, a high-pressure water descaling treatment is performed, thereby obtaining a to-be-processed slab; rolling: the to-be-processed slab is rolled to obtain a strip steel. According to the embodiment of the application, the slab after the slab continuous casting is subjected to the pre-descaling treatment before the slab is heated in a furnace, and after the heating treatment, the high-pressure water descaling treatment is performed before rolling, thereby removing the initial thick iron oxide scale on the surface of the slab and ensuring that the uniformity of the iron oxide scale formed on the surface of the slab during hot rolling is good.

This invention relates to a method for producing support roll steel, belonging to the field of metallurgical industry, and solves the problems of high cost and severe shrinkage porosity in existing support roll steel. The method for producing support roll steel includes: smelting, deoxidizing, desulfurizing, and refining the support roll steel ingot raw material, adjusting the alloy composition to obtain a first portion of support roll steel molten steel, tapping the steel, vacuum casting, and solidifying to obtain a solidified billet shell and liquid steel inside the billet shell; smelting, deoxidizing, desulfurizing, and refining the support roll steel ingot raw material, adjusting the alloy composition to obtain a second portion of support roll steel molten steel, tapping the steel, mixing the second portion of support roll steel molten steel with the liquid steel inside the billet shell within the solidified billet shell of the first portion of support roll steel, vacuum casting, solidifying to obtain a complete support roll steel ingot, demolding, removing the sprue, forging, removing the riser, heat treating, and machining to obtain the support roll steel; the composition of the first portion of support roll steel and the second portion of support roll steel molten steel differs.

The invention relates to a method for RH magnesium treatment of molten steel, which comprises the following steps: smelting initial molten steel through RH to obtain intermediate molten steel; magnesium alloy is added into the intermediate molten steel under the RH vacuum condition for magnesium treatment, and magnesium-treated molten steel is obtained; continuously casting the magnesium-treated molten steel to obtain a steel billet; feO + MnO in the steel ladle top slag above the initial molten steel is less than or equal to 4% by mass; the content of acid-soluble aluminum Als in the intermediate molten steel is 0.02%-Alb1, and the Alb1 is the upper limit value of the aluminum content of the intermediate molten steel before magnesium treatment. The adding position of the magnesium alloy is limited in the upper area of the RH descending pipe, so that the magnesium alloy enters the deep position of a steel ladle along with descending initial molten steel flow, and the acting time of the alloy and intermediate molten steel is prolonged. Magnesium steam is inhibited and an alloy structure is protected by utilizing a vacuum environment, and nodulizing and dispersion of inclusions can be realized only by adding a small amount of the alloy. According to the method, secondary oxidation of the magnesium treatment molten steel is effectively inhibited, the cleanliness is improved, the continuous casting nozzle nodulation risk is eliminated, and stable continuous casting operation is guaranteed.

The utility model discloses a device for synchronously controlling a withdrawal and straightening machine and a dummy bar of a continuous casting machine. The device comprises a potentiometer, a PLC (Programmable Logic Controller) control system, a signal isolation module, a withdrawal and straightening machine frequency converter, a dummy bar frequency converter and a digital display instrument. The potentiometer is connected to an analog quantity input port of the PLC control system through the one-input one-output optoelectronic isolator and is used for inputting an initial control signal; the output end of the PLC control system is connected with the withdrawal and straightening machine frequency converter and the dummy bar frequency converter to drive the two frequency converters to operate. A feedback signal of the withdrawal and straightening machine frequency converter is divided into two paths to be transmitted to the PLC control system and the withdrawal and straightening machine digital display instrument through the one-input two-output isolator, and a feedback signal of the dummy bar frequency converter is directly accessed to the dummy bar digital display instrument. The device eliminates electromagnetic interference through a photoelectric isolation module, integrates a water distribution model and a molten steel temperature data interface, adopts a standardized interface design for hardware, is adaptive to different continuous casting machine models, has the characteristics of strong anti-interference capability, stable signal transmission and visual real-time monitoring, and effectively improves the operation reliability of equipment.

The invention provides a method for reducing content of MnS inclusions in steel, including: (1) placing raw materials of other elements than manganese in a smelting furnace according to components of steel to perform smelting to obtain liquid steel; (2) first adding a first rare earth element and sulfur to the liquid steel, to form rare earth sulphide, then adding a raw material containing manganese to perform smelting, performing tapping after smelting is completed, and performing pouring and cooling to obtain a cast ingot. A rare earth element and sulfur are first added to liquid steel before manganese is added to generate tiny, round rare earth sulphide, and subsequently manganese is added to make it difficult to generate MnS, so that MnS and rare earth / manganese / sulfur composite inclusions are reduced, and content of MnS inclusions at a parting plane of a workpiece is reduced, thereby improving the reliability of the workpiece.

The invention relates to a metal mold extrusion imbedding method, which is specially used for an imbedding casting which cannot be used for imbedding a large-proportion insert in gravity casting, and comprises the following steps of: fixing all inserts on an insert assembly which is made of a thin steel plate, can be put into a metal mold, has a casting appearance, is provided with an opening at the upper end and is used for isolating molten steel from directly contacting with the metal mold; the method comprises the following steps: putting an insert assembly into a furnace, heating to 600-1000 DEG C, putting into a metal mold, closing and locking the mold, quantitatively pouring molten steel at an upper end opening, starting a press, carrying out closed extrusion on the molten steel by an upper mold, enabling the molten steel to enter a small space between inserts, and wetting the surfaces of the inserts at a certain temperature under pressure to form metallurgical bonding.

The utility model provides a converter steel slag waste heat recovery system, and particularly relates to the technical field of solid waste treatment, the converter steel slag waste heat recovery system uses a phase change ball tank and a slag tank to respectively add phase change balls and the slag tank into a mixing stock bin, and the phase change balls and steel slag are mixed in the mixing stock bin; conveying and heat exchange are synchronously achieved in the rotary conveying device, phase-change core metal in the phase-change balls is gradually converted into a liquid state from a solid state, the steel slag is gradually reduced to the target temperature, then the steel slag and the phase-change balls are conveyed into the solid-solid separation device to be separated, and finally the phase-change balls enter the waste heat recovery device to conduct heat exchange with a medium to release heat. Meanwhile, the internal phase change core metal is gradually converted into a solid state from a liquid state and is conveyed into the mixing bin again through the conveyor, and due to the fact that the phase change balls have good stability, high energy storage density and high heat conductivity, a large amount of heat energy can be efficiently and stably stored; the problem that high-grade waste heat of converter steel slag cannot be efficiently and stably recycled is solved.

The application relates to the technical field of tail gas treatment, in particular to a method and system for carbon neutralization in lime kiln tail gas; the method comprises the following steps: obtaining liquid steel slag after a converter and lime kiln tail gas respectively; performing pressure swing adsorption on the lime kiln tail gas to obtain first CO2 gas; introducing the first CO2 gas into the first treated steel slag to perform an oxidation-reduction reaction, then performing second heat exchange and post-treatment to obtain second CO2 gas and CO gas respectively; returning the second CO2 gas to the blowing to realize carbon cycle; collecting and storing the CO gas to realize carbon neutralization; the system comprises a lime kiln tail gas collecting part, a steel slag reaction part, a gas treatment part and a control part; the utilization of CO2 in the lime kiln tail gas can improve the heat energy utilization rate of the steel slag.

The invention discloses a simulated liquid level dynamic control method based on a Fluent continuous casting tundish, which comprises the following steps: S1, establishing a geometric model of the tundish and a long nozzle, and carrying out grid division; s2, importing the geometric model of the tundish and the long nozzle subjected to grid division into Fluent software, and setting calculation parameters; s3, developing a Fluent user self-defined function, and importing the Fluent user self-defined function into Fluent compiling; and S4, after the user-defined function is imported into Fluent to be compiled, analog calculation is started, and dynamic control over the liquid steel level in the tundish is achieved. The method has the advantages that real-time dynamic control of the liquid level of the molten steel in the tundish in the simulation process is achieved, the liquid level is accurately controlled, the limitation of single-phase flow or constant flow assumption adopted in a traditional simulation method is overcome, the actual production working condition is met, and the consistency of the simulation result and the actual production process is remarkably improved.

The application provides a chemical vapor deposition polycrystalline diamond steel liquid erosion polishing method and relates to the technical field of diamond material processing. The chemical vapor deposition polycrystalline diamond steel liquid erosion polishing method places steel material with a carbon content of 0-0.77% and a weight of 0.1-5 kg in a ceramic crucible, uses inductive coupling to heat the steel material to 1400-1800 DEG C and controls the liquid surface to be stable, uses a motion controller with a moving control precision of not more than 0.02 mm to immerse the sample in the steel liquid for 0.1 s-10 min and then take out the sample, and carbon atoms constituting the sample are dissolved and diffused into the steel liquid under the action of the steel liquid erosion, so that the sample surface is rapidly flattened. The method has the advantages that a new way is provided for realizing high-speed, high-yield and high-throughput polishing processing of chemical vapor deposition polycrystalline diamond.

The invention relates to a method for producing liquid steel in an electric arc furnace (2) comprising successively: - defining a targeted nitrogen content wt. %Ntarg of the produced liquid steel, - introducing a metal load in the electric arc furnace (2) and - melting it for generating a steel bath (10) and a slag (12); - carburizing the steel bath (10) by adding a carbon amount equal to or greater than a minimum denitrogenation carbon amount CdeN, said amount CdeN being defined as a function of the nitrogen content in excess to wt. %Ntarg at the beginning of the step (E4), - injecting a flow of oxygen to reach a nitrogen content wt. %N such that wt. %N ≤ wt. %Ntarg, - tapping the steel bath (10) to obtain the produced liquid steel.

Method of producing steel using an Electrical Arc Furnace (EAF), the method comprising: (a) melting a metal load (L) in the EAF and generating liquid steel (LS); (c) tapping the liquid steel (LS) from the EAF; and (d) performing secondary metallurgy on the liquid steel (LS) in at least one secondary metallurgy reactor to adjust the chemical composition of the liquid steel (LS), wherein the method comprises adding a first slag compound (SC1) with nitrogen affinity in the liquid steel (LS) during tapping of the liquid steel (LS) from the EAF and creating a ladle slag (S2).

A monitoring method of a steelmaking process in a steelmaking vessel, wherein matters Mn, each having its respective properties PMn, are charged into said steelmaking vessel so as to produce a liquid steel and a slag.

This invention discloses a multi-source solid waste-based cementitious material and its preparation method, relating to the technical field of cementitious materials for solidified organic soft soil. The raw materials for the cementitious material include: carbide slag, desulfurization ash, yellow phosphorus slag, highly active and stable steel slag, modified red mud, alkaline slag, desulfurized gypsum, slag, and calcium sulfoaluminate; the highly active and stable steel slag is obtained from liquid steel slag after preliminary stabilization treatment and activation; the steel slag activation is achieved by preparing stabilized steel slag, modified ettringite microparticles, aluminum sulfate, polycarboxylate superplasticizer, hexadecyltriethylammonium bromide, and potassium hydroxide; the modified red mud is prepared from red mud, magnesium hydroxide, N-methyldiethanolamine, desulfurization ash, calcium oxide, and ferric chloride solution; the modified ettringite microparticles are modified with polyvinyl alcohol and N-β-aminoethyl-γ-aminopropyltrimethoxysilane. The multi-source solid waste-based cementitious material of this invention effectively improves the compressive strength and water stability coefficient of solidified organic soft soil.

The invention relates to a steelmaking method comprising the following successive steps: a. feeding an electrical furnace with an initial load consisting of 0 to 50 wt.% of pig iron or hot metal, 0 to 50 wt.% of scraps, and at least 50 wt.% of reduced iron, the respective load content in sulfur and titanium being below 100 ppm in weight after melting down, b. tapping the melted load in a ladle and submitting it to a decarburization step without prior deoxidation, then to an alloying step and then to a desulfurization step, then to an optional final alloying step to obtain a liquid steel having a sulfur content below 30 ppm in weight, a titanium content below 100 ppm in weight and a carbon content below 50 ppm in weight, c. casting said liquid steel.

The application discloses a continuous casting adjustment method and system for mold assembly simulation, and relates to the technical field of continuous casting process optimization.The method comprises the following steps: collecting network data according to the equipment ID and the liquid steel component information of the mold assembly to obtain continuous casting historical data; expanding the working conditions of the continuous casting historical data to obtain continuous casting coverage data; establishing an initial finite element model; calibrating boundary conditions to obtain a continuous casting finite element model; performing clustering analysis to locate the starting point of the continuous casting optimization difference; starting parallel local iterative optimization to obtain a continuous casting multi-objective balanced solution set; and performing global iterative optimization to obtain a continuous casting adjustment control benchmark.The application solves the technical problem that the shell uniformity and thickness are difficult to accurately control in the prior art, which leads to unstable continuous casting quality, and achieves the technical effect of indirectly optimizing the control of the shell uniformity and thickness in the continuous casting process and improving the continuous casting quality.

The invention relates to the technical field of roller casting, and provides an intelligent casting device for a cast steel roller, which comprises a casting mold and a rotating device for driving the casting mold to rotate, a pouring runner used for pouring molten steel into the casting mold, a supporting frame arranged on the outer side of the pouring runner and used for supporting the pouring runner and a sliding device used for driving the pouring runner to slide in the supporting frame are arranged at a port of the casting mold, the sliding device is fixed in the supporting frame, and one end of the pouring runner is inserted into the casting mold and slides in the casting mold; the sliding device comprises a gear ring fixedly connected with the casting mold, a driven gear meshed with the gear ring, a lead screw rotationally connected with the supporting frame and a connecting block fixedly connected with the pouring runner, the lead screw and the driven gear are fixedly connected and rotate synchronously, and the lead screw is in threaded connection with the connecting block. The sliding device has the beneficial effects that the sliding device drives the pouring runner to uniformly slide in the casting mold, so that molten steel is uniformly distributed in the axial direction of the casting mold, and the purpose of reducing the probability of cold shut is achieved.

The utility model relates to the technical field of tundish flow control, in particular to a magnesium flow stabilizer for a tundish, which comprises a hollow magnesium body, the top of the magnesium body is provided with an opening, the inner bottom of the magnesium body is provided with a corundum drainage body coaxial with the magnesium body, and the corundum drainage body is provided with a circular top surface; wherein the inner bottom surface of the magnesian body is an arc-shaped surface which is in smooth transition with the inner wall surface of the magnesian body and the outer wall surface of the corundum drainage body; by means of the smooth arc transition design of the inner bottom face of the magnesium body and the outer wall face of the corundum drainage body, turbulence and local scouring during flowing of molten steel are effectively reduced, the high hardness characteristic of the corundum drainage body is combined, erosion to the magnesium body is remarkably reduced, and the service life is prolonged. The inner wall face of the magnesium body is designed to be a conical face, the flow speed of molten steel is guided to be evenly distributed, and local scouring aggravation caused by sudden change of the flow speed is avoided.

A method of casting a steel semi-finished product, in which liquid steel is poured from a ladle to a tundish by means of a shroud, the method comprising the steps of determining the intensity of the light emitted from the surface of the liquid steel in the tundish, detecting the presence of a slag eye at the surface of the liquid steel on the basis of the determined intensity, and issuing an alert to an operator when a slag eye is detected.

Method for producing liquid steel in an electric arc furnace with final decarburization The invention relates to a method for producing liquid steel in an electric arc furnace (2) comprising successively: - melting a metal load in the electric arc furnace (2) for generating a steel bath (10); - denitrogenating the steel bath (10) to reach a nitrogen content %N below a targeted nitrogen content %Ntarg, wherein the carbon content %C remains greater than a targeted carbon content %Ctarg; - applying a final decarburization treatment to reach a carbon content %C ≤ %Ctarg, to reach an oxygen content %Op greater than 200 ppm, wherein oxygen is injected at a flow rate above 0.3 Nm3 / min / ton, the ambient air being at a pressure of above 90% of the atmospheric pressure; - tapping the steel bath (10), the oxygen content %Op reached by the final decarburization treatment being maintained up to the tapping.

The invention relates to an improved YOLOv8 model-based method for intelligently judging the working state of a bottom blowing ventilation element of a top-bottom combined blown converter on line, so that field staff are helped to correctly evaluate and process the possible serious blockage or erosion condition of the bottom blowing ventilation element in time. And therefore, the working state of the bottom blowing ventilation element is kept for a long time, the smelting quality of molten steel in a converter link is ensured, and a solid foundation is laid for subsequent improvement of product performance and reduction of production cost.

The application discloses a kind of continuous casting tundish residual steel height on-line detection and automatic control method, comprising the following steps: setting liquidus temperature measuring point in tundish;Casting operation starts, liquid steel enters tundish;Temperature measured by temperature measuring instrument continues to rise and is higher than 1450 DEG C, start into continuous casting state;Temperature measured by temperature measuring instrument is maintained at 1500-1550 DEG C, continuous casting state continues to carry out;Temperature measured by temperature measuring instrument drops and is lower than 1500 DEG C, start to detect temperature drop rate;Temperature drop rate measured by temperature measuring instrument reaches per minute cooling more than 12.5 DEG C, judge tundish residual steel as low liquid level state;Record current tundish tonnage data;Close tundish outlet, end casting operation.The application solves the security risk when manual operation, prevents abnormal accident from happening due to manual judgment, effectively controls production logistics stability and safety, solves production safety and the effect of controlling continuous casting production quality problem.

The present application relates to a kind of cobalt-based superalloy HS-25 hot-rolled plate and its manufacturing method, belong to metal processing technical field.The manufacturing method includes the following steps: non-vacuum induction smelting, Si-Ca powder and Si-Ca block are combined deoxidation, effectively reduce the oxygen content of liquid steel;Electroslag remelting, reduce Mn element burning loss by argon protection, improve composition uniformity;Forging breakdown, optimize holding time and temperature, ensure that organization is dense;Hot rolling into material, multiple back furnace insulation, improve plate thickness uniformity;Solution treatment, realize grain refinement and uniformity control by accurate heating rate and holding time.Finally, the thickness of 8mm, width of 1000mm, length of 2200mm hot-rolled plate material is obtained.The manufacturing method of the present application is optimized by process, significantly improves the comprehensive performance of plate, solves the problems such as high oxygen content, Mn burning loss is serious, grain size control is insufficient in prior art, and is suitable for high-end fields such as aviation, nuclear energy.

The application discloses a method for producing low-oxygen-content molten steel by adopting an EF+LFV process, wherein 20-30% of weight of slagging materials of smelting raw materials is added with carbon-increasing materials, so that the carbon content of the smelting raw materials reaches 1.20-1.50% of the weight of the smelting raw materials, the oxidation end point temperature is controlled to be greater than or equal to 1630 DEG C, and the carbon content at the oxidation end point is not less than the lower limit of the carbon content required by the smelted steel minus 0.05%; Si-Mn alloy, Si-Fe alloy and carbon-increasing agent are sequentially added into a refining ladle when tapping; and the molten steel is slagged and wire-feeding deoxidized during the refining period; and the molten steel produced by adopting the method has an oxygen content of less than or equal to 20 ppm, so that the purity of the molten steel is ensured to be high, and the production requirements are met.