15results about "Steel manufacturing process aspects" patented technology

The present invention belongs to the technical field of automated steel production and discloses a method for predicting the composition of molten iron applied to an automated steel production process, wherein the method is: performing a sampling and an examination of molten iron in a process in which the molten iron is tapped from a torpedo tank into a ladle, and calculating a loss of composition of this molten iron, wherein the composition of the molten iron is calibrated before the molten iron is tapped into the ladle;Performing a sampling and analysis of the molten iron in a process where the molten iron is transferred from the ladle to a converter, and calculating any loss in the composition of this molten iron, wherein the composition of the molten iron is calibrated before the molten iron is transferred to the converter. The present invention is easy to use and implement, and can acquire more accurate and reliable real-time parameters for computational models at all levels; in its specific application, the present invention does not require the modernization of existing automated steelmaking equipment; and it can be applied to a wide range of automated steelmaking scenarios.

The present invention describes a method and a device for data processing for automatically adjusting parameters in a mathematical model. The technical problem consists in improving a computer-implemented method for automatically adjusting parameters in a mathematical model for the monitoring and / or open-loop / closed-loop control of a production process for steelmaking, said improvement being achieved by optimizing parameters. Input variables comprising at least one measured value are fed into the mathematical model, and the mathematical model outputs output variables that are used for the monitoring and / or open-loop / closed-loop control of the production processes. The technical problem is solved in that the input variables and the parameters are recorded at least in part, wherein operands comprise at least one process variable, for which measurands are also available. A cost function of differences is determined which evaluates the deviation between said measurands and the corresponding operands, with a sensitivity vector being determined from the cost function of differences and from the parameters. By means of an optimization method, parameters are determined progressively such that the cost function of differences is minimized.

A method for efficiently manufacturing low-phosphorus molten steel by use of a steelmaking electric furnace, in which slag resulting from melting a solid iron source is effectively separated from molten steel, and thus a unit consumption of lime required to reduce a phosphorus content in the molten steel is reduced. The method includes: charging a solid iron source and an optional molten iron source and melting and heating these raw materials by using electric energy; partly or entirely removing slag generated during the melting; performing dephosphorization by adding dephosphorization flux; and tapping low-phosphorus molten steel thus refined, and in the method, a slag composition ratio being [CaO] / ([SiO2]+[Al2O3]) of the slag to be removed is adjusted to be not less than 0.25 and not more than 0.70.

The present invention relates to a method for regulating an operation of an electric furnace (10) during a melting process of melting material, the method comprising the following method steps : - model predictive calculating (S1) of a target course of at least one operating property (Op) up to a time horizon (N) based on a result to be achieved of the melting process; and - setting (S2) the at least one operating property (Op) by means of the electrode positioning means (30) and / or the electrical power supply means (50) in such a way that the at least one operating property (Op) lies on the target course of the at least one operating property (Op) at a predetermined future point in time. The present invention further relates to an electric furnace (10) configured to execute a method for regulating an operation of an electric furnace (10) during a melting process of melting material.

A combustion control method for a hot blast stove including a combustion step of storing, in a regenerator, a quantity of heat input by combusting a mixed gas, and a blast sending step of generating hot blast by supplying cold blast into the regenerator and supplying the generated hot blast to a blast furnace includes the steps of: calculating an actual value of the quantity of heat; calculating a quantity of heat deprived of by the generation of the hot blast; calculating an actual value of thermal efficiency of the hot blast stove; calculating a quantity of heat to be input when hot blast is generated next time; calculating a quantity of the mixed gas to be supplied when hot blast is generated next time; and controlling the hot blast stove based on the calculated quantity of the mixed gas.

An apparatus (10) for smelting liquid metal (L) includes a ladle (11) for containing the liquid metal (L), having an open top (12) and at least one porous plug (13) on its bottom wall (14), a removable lid (19, 23), a gas injection line (21) connected to the at least one porous plug (13), and a control unit (27).

A method of producing steel using an electric arc furnace (EAF) comprises in sequence: charging a furnace charge (L) into the EAF, the furnace charge (L) comprising scrap (SC); energizing electrodes of the EAF to melt the furnace charge (L) and produce a melt (M); introducing a desulphurizing slag former into the melt (M) in the EAF for collecting sulphur in a slag (S1) above the melt (M), and then removing the slag (S1) from the EAF; and injecting oxygen into the EAF to decarburize the melt (M).

A converter steelmaking method has molten pig iron subjected to dephosphorization process for dephosphorized molten iron, dephosphorized molten iron is subjected to decarburization process for molten steel. For dephosphorization process, a first cold iron source in amount meeting Formula (1) is charged into first converter-type vessel, then undephosphorized molten pig iron is charged and subjected to dephosphorization process. Dephosphorized molten iron is discharged and held in molten metal receiving vessel. After second cold iron source is charged into first converter-type vessel in which dephosphorization process has been performed, the dephosphorized molten iron held in molten metal receiving vessel is charged and subjected to decarburization process. % Ws0≤0.1186T−134 (% Ws0≥0) . . . (1), where % Ws0: a ratio (%) of first cold iron source to sum of first cold iron source and charge amount of undephosphorized molten pig iron, and T: a temperature (° C.) of undephosphorized molten pig iron.

A hot-metal temperature-control method includes a permeability-abnormality determination step (S1 to S7) of determining an abnormality in furnace permeability of a blast furnace, an unburned-coal occurrence determination step of determining the occurrence of unburned pulverized coal due to pulverized coal that is injected from a tuyere and remains unburned, and an action-necessity determination step of determining whether action is necessary regarding hot-metal temperature-control based on a determination result of the permeability-abnormality determination step and the unburned-coal occurrence determination step.

A method (100) for controlling stirring within a container (22) of a steelmaking furnace (20), the container (22) comprising a metal bath (1) containing molten metal (3) and a slag layer (5), the method (100) comprising: - measuring at least two parameters representing the metal bath (1) contained within the container (22) during stirring; - detecting the formation of an opening (8) in the slag layer (5) based on the measurement of the at least two parameters; - adjusting the stirring based on the detection of the formation of the opening (8); wherein the at least two parameters include visual parameters measured on an image of the slag layer (5) captured during stirring, and mechanical parameters representing mechanical waves generated within the container (22) during stirring.

A decarburization treatment end determination method includes a molten steel carbon concentration estimation step (S3, S4), and a decarburization treatment end determination step (S5). The molten steel carbon concentration estimation step divides the decarburization treatment into a plurality of stages, and estimates the carbon concentration using a different molten steel carbon concentration estimation model for each stage. The molten steel carbon concentration estimation model of a final stage expresses a decarburization reaction rate as a differential equation having a term proportional to the product of a linear expression of a carbon concentration in a portion of the molten steel placed in the reduced pressure environment Cv and a decarburization reaction capacity coefficient ak. The decarburization reaction capacity coefficient ak is calculated as a linear expression of the logarithm of a pressure P in a vacuum vessel.

There are provided a method for determining a decarburization treatment end, vacuum degassing equipment, a method for operating vacuum degassing equipment, and a method for producing molten steel capable of estimating the carbon content in molten steel with high accuracy by properly utilizing exhaust gas measurement values to end the decarburization treatment at appropriate timing. A method for determining a decarburization treatment end for determining an end of decarburization treatment when vacuum degassing treatment including the decarburization treatment is performed by placing molten steel in a reduced-pressure environment includes: dividing the decarburization treatment into two stages of first half decarburization treatment M1 and latter half decarburization treatment M2, and estimating the carbon contents in molten steel in the first half decarburization treatment M1 and the latter half decarburization treatment M2 using different estimation models for the carbon content in molten steel for the first half decarburization treatment M1 and the latter half decarburization treatment M2, in the first half decarburization treatment M1, using the estimation model constructed based on machine learning for actual operation result data (S3), and, in the latter half decarburization treatment M2, determining the end of the decarburization treatment when an estimated value of the carbon content in molten steel has reached a target value (S7).

An apparatus (10) for the reduction of foam in a foaming metallurgical slag, comprising at least one electrical signal generator (12), a sound wave emitter unit (11) comprising at least one pair of emitters (13), each of which comprises a transducer (14) connected to the generator (12) and configured to convert the electrical signals generated by the generator (12) into mechanical vibrations along a vibration direction (X) and a mechanical amplifier (15) connected to the transducer (14) and configured to amplify the amplitude of the mechanical vibrations by generating sound waves along a respective preferential propagation direction (Y), and an electronic control unit (16) of the emitter unit (11) and of the generator (12), wherein the emitters (13) are arranged in such a way that the respective preferential propagation directions (Y) converge at a single intersection point (F). Said apparatus (10) is arranged close to a mass of foaming metallurgical slag in such a way that said intersection point (F) is close to the surface of the foaming metallurgical slag and the electronic control unit (16) controls the emitter unit (11) and / or the generator (12) in such a way that the emitters (13) of at least one pair of emitters emit sound waves having frequencies that differ from each other by a maximum of 5%.

This invention relates to a production method of high-carbon bearing steel for high-speed precision machine tool spindle bearings, belonging to the field of metallurgy. The production process employs "KR hot metal pretreatment → converter smelting → converter tapping → LF refining → vacuum degassing → continuous casting". The entire process is designed with synergistic optimization, deeply coupling the control targets of each process. KR's ultra-low sulfur content (≤0.004%) lays the foundation for low-oxygen and low-sulfur smelting. Precise endpoint control in the converter (C / P / temperature) ensures efficient LF and RH refining. Electromagnetic stirring and light reduction technology in continuous casting synergistically improve homogenization. The steel has the following properties: oxygen content ≤5ppm, sulfur content ≤0.006%, calcium content ≤5ppm, titanium content ≤9ppm, central porosity ≤1.0 grade, central segregation ≤1.0 grade, fine B inclusions ≤1.0 grade, coarse B inclusions ≤0.5 grade, DS inclusions ≤0.5 grade, and macroscopic purity ≤3mm / dm². 3 Rated rolling contact fatigue life L under 4.5 GPa contact stress 10 =2.38*10 7 It reaches more than 1.2 times that of molded materials.

A production facilities monitoring method according to the present invention monitors an operation status of a plurality of production facilities of the same kind located at a plurality of production sites. The production facilities monitoring method includes a data information preparation step of aggregating operational data of a production facility for each production site, a data accumulation step of accumulating operational data aggregated at the data information preparation step into a computer located at a data accumulation site, a data analysis step of analyzing a current operation status at each production facility, using current operational data and past operational data accumulated at the data accumulation step, and an operation status determination step of determining whether operation is abnormal at each production facility, based on an analysis result of the data analysis step.