2863results about "Manufacturing converters" patented technology

The invention discloses a distillation SAE and dynamic integration converter steelmaking carbon temperature soft measurement method, which comprises the following steps of: training a teacher model on a large-scale data set of a conventional production working condition, and compressing the model by adopting a knowledge distillation technology; then, a small amount of data from unconventional production working conditions is used for fine tuning to obtain a plurality of expert-type student stacking auto-encoder models SAE; in the prediction stage, a to-be-tested sample is mapped to respective feature space through a plurality of SAEs, and the posterior probability of the sample is calculated in each feature space based on a Gaussian distribution model; and finally, respectively inputting a to-be-measured sample into a plurality of corresponding regression devices to obtain a predicted value, and carrying out weighted fusion on the output of each regression device according to a posterior probability to realize dynamic integration selection of the soft measurement model. The method can effectively adapt to complex data distribution of multi-working-condition changes in converter steelmaking, the carbon temperature prediction precision under the unconventional working condition is improved, and the method has high robustness and engineering practicability.

The invention discloses a wide and thick steel plate for a 700MPa-grade corrosion-resistant anti-fatigue marine tendon pipe and a production method of the wide and thick steel plate. According to the component design of the wide and thick steel plate, CEIIW is controlled to be 0.41-0.47%, CEPcm is controlled to be 0.16-0.20%, low-Nb and low-Mo design is adopted, the phase change temperature is increased, and phase change of polygonal ferrite is promoted; rE solid solution, interface segregation and other effects are fully utilized to improve the strength and corrosion resistance, and the RE and Ca act together to purify molten steel and modify and disperse inclusions. On the basis of component design, low-temperature heating, rough rolling multi-stage thickness section high-temperature gradient deformation and low-temperature rolling, intermediate temperature-waiting blank rapid cooling after rough rolling is finished, finish rolling low-temperature deformation, multi-stage water cooling and other methods are adopted to obtain a microstructure of lath bainite, granular bainite and polygonal ferrite, and the proportion, size and distribution control of all phases is ideal; the method plays an important role in obtaining good comprehensive performance of the steel plate.

The invention discloses a wide and thick steel plate for a 600MPa-grade high-performance marine riser and a production method of the wide and thick steel plate, according to the component design of the wide and thick steel plate, CEIIW is controlled to be 0.35%-0.41%, CEPcm is controlled to be 0.14%-0.18%, and beneficial influences on strengthening, phase change, microstructure, steel plate performance and post-welding performance are achieved; on the basis of component design, production methods of low-temperature heating, rough rolling multi-stage thickness section high-temperature gradient deformation and low-temperature rolling, intermediate temperature-waiting blank rapid cooling after rough rolling is finished, finish rolling low-temperature deformation, multi-stage water cooling and the like are adopted to obtain polygonal ferrite and batten bainite; the steel further comprises a small amount of granular bainite microstructures and dispersed fine precipitates, and the average height of deformed austenite does not exceed 15 microns; the problem of matching of comprehensive technical characteristics such as high strength, high toughness, high fatigue performance, corrosion resistance, strain resistance and good welding performance of the wide and thick steel plate for the high-performance marine oil and gas exploitation vertical pipe is solved.

Provided are a joint regulation method of material flow, energy flow, and carbon emission flow in a long-process steel enterprise, which belongs to a field of intelligent regulation and control technology of electric power system in the steel industry. The method includes: coupling a material-energy characteristic model of each production process of a steel enterprise and a carbon emission model of the steel enterprise, constructing a material flow-energy flow-carbon emission flow coupling model of the long-process steel enterprise, establishing an objective function using a minimize sum of an electricity purchase cost from a superior grid, a park carbon emission cost, and a production raw material cost as an object, and solving and obtaining an optimal operation mode of a joint regulation of the material flow-energy flow-carbon emission flow in the steel enterprise.

The invention discloses a transverse intelligent deviation rectifying method and system in the mounting and advancing process of a large converter, and belongs to the technical field of deviation rectifying mechanisms. The transverse intelligent deviation rectifying system for the installation and advancing process of the large converter comprises a transverse intelligent deviation rectifying device, a speed detection module, a distance detection module and a control unit which are installed on a rail vehicle, the speed detection module and the distance detection module are respectively used for detecting the running speed of the rail vehicle and the transverse installation deviation distance of the converter on the rail vehicle and feeding back to the control unit, and the control unit is used for controlling the starting and stopping of the transverse intelligent deviation correction device, so that the transverse installation deviation correction of the converter is carried out. By the adoption of the technical scheme, the transverse deviation rectifying efficiency in the converter mounting and positioning advancing process can be effectively improved, the converter mounting and positioning precision can be guaranteed, and the safety in the deviation rectifying process is improved.

The invention discloses a converter lining thickness determination method and device, electronic equipment and a storage medium. According to the specific scheme, after smelting of a current heat is completed, smelting parameters and an infrared image of a target converter are obtained, and the infrared image is an image of a local area of the target converter; according to the infrared image, the target furnace lining temperature of the target converter is determined, and according to the target furnace lining temperature and the smelting parameters, the corresponding predicted furnace lining stripping amount of the target converter under the current heat is determined; according to the initial furnace lining thickness information and the predicted furnace lining stripping amount, the target furnace lining thickness corresponding to the target converter is determined; wherein the initial furnace lining thickness information is a furnace lining thickness parameter determined by the target converter before the current smelting. The method improves the efficiency and accuracy of determining the thickness of the converter lining.

The invention discloses a converter body mounting and positioning system and method based on a buggy ladle, and belongs to the technical field of converter mounting and positioning. According to the converter body mounting and positioning system, the position detection device is used for detecting whether position deviation exists on the two sides of the converter body or not in the in-place conveying process and detecting the alignment condition of the converter body and bolt mounting holes in a converter support; when the converter body has installation position deviation, the steel rail on the corresponding side is clamped through the speed reduction clamping device; when the converter body reaches the braking distance, the steel rails on the two sides are clamped at the same time, and simultaneous speed reduction of the single side or the two sides of the buggy ladle is achieved; and after the converter body is in place, the steel rail is clamped and locked through the brake locking device, so that parking brake of the buggy ladle is realized. In the conveying process of the converter, through accurate control and auxiliary braking of the buggy ladle, high-precision automatic in-position of the converter body can be achieved, and the installation efficiency and the installation precision are improved.

The invention relates to the technical field of steel and iron smelting, and particularly discloses an ultra-low sulfur steel smelting method, which comprises the following steps of: washing a converter and washing a steel ladle before converter smelting; in the desulfurization process, high-temperature molten iron is used, deep desulfurization is conducted through a KR desulfurization method, and the sulfur content of the molten iron is smaller than or equal to 0.003%; converter working procedure: smelting by using a top-bottom combined blown converter, adopting a single-slag remaining method, adding self-produced first-class scrap steel, using low-sulfur lime, dolomite and iron-containing oxide, and controlling the end point of the converter: controlling the tapping carbon to be less than or equal to 0.04%, sulfur to be less than or equal to 0.005% and the temperature to be more than or equal to 1610 DEG C, adding lime for slag washing in the tapping process, adding part of lime for thick slag treatment after the tapping is finished, and then performing slagging-off operation; a refining process: adding lime and refining slag for slagging and desulphurizing, and finely adjusting components and raising the temperature; a continuous casting process: carrying out continuous casting; and finally, sulfur in a casting blank smelting finished product is less than or equal to 6ppm.

The invention relates to a slag charge adding device for smelting low-phosphorus steel through a high-silicon molten iron converter double-slag method, and relates to the technical field of steel-making slag charge adding. The slag charge adding device comprises a base, a converter body is installed on the base, a fixing frame is fixedly connected to the base, a moving assembly is arranged on the fixing frame, a storage barrel is arranged on the moving assembly, and the storage barrel is connected with the converter body. A sorting assembly is arranged below the storage barrel, and the lower portion of the sorting assembly communicates with a spreading disc. The method has the advantages that the slag materials are separated and scattered in different areas according to different sizes, large particles fall into the center position close to the converter body, small particles fall into the area close to the side wall of the converter body, and the temperature of the center position of the converter body is usually the highest area, so that the slag materials are separated; and the high temperature is beneficial for increasing the melting speed of the large-particle slag charge, so that the large-particle slag charge can participate in the chemical reaction of steelmaking more quickly.

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 discloses a steel slag dry-method treatment system and a whole-process waste heat recovery process, and belongs to the technical field of steel slag treatment and waste heat recovery. According to the technical scheme, the system comprises a high-temperature section waste heat recovery system, a medium-low temperature section waste heat recovery system and a steel slag secondary separation and tailing digestion system. Firstly, steel slag discharged from a smelting furnace enters a high-temperature section waste heat recovery system, and heat is recovered by adopting a vertical waste heat recovery device through air heat exchange. Afterwards, the steel slag subjected to rolling crushing enters a medium-low temperature section waste heat recovery system, and heat of the steel slag is directly exchanged and recovered through a kiln type waste heat recovery device. And finally, iron-containing materials and tailings are separated from the steel slag through magnetic separation, and the tailings can be comprehensively utilized after being digested by digestion gas. The method has the beneficial effects that the whole-process waste heat recovery of the steel slag discharged from the smelting furnace can be realized, the resource recovery rate is improved, and the problems existing in steel slag treatment in the current steel industry are effectively solved.

The invention discloses a manufacturing method of a high-efficiency and low-cost steel plate for a 345MPa-grade low-temperature pressure vessel, and belongs to the technical field of low-carbon microalloyed steel production. The manufacturing method comprises the steps of molten steel smelting, LF refining, RH vacuum degassing, continuous casting, casting blank heating, rolling, controlled cooling and straightening. The problems that steel plate rolling efficiency is low, rolling resistance is large, and the plate shape is not easy to control are solved, the steel plate is low in cost, high in strength and toughness and high in straightness, and the service safety of the steel plate for the low-temperature pressure container can be guaranteed.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to an intelligent online optimization method of a converter steelmaking process for low-carbon low-cost smelting, which applies field manufacturing standards and historical furnace production data and comprehensively considers indexes such as converter molten iron conditions, smelting targets, upper and lower limits of manufacturing conditions, smelting cost and carbon emission intensity. By combining intelligent algorithms such as local online modeling and multi-objective optimization, intelligent online optimization of converter steelmaking smelting and operation process parameters is achieved, the intelligent control level of a field converter is improved, and the dual purposes of energy conservation, emission reduction, cost reduction and efficiency improvement of converter smelting are achieved.

The invention discloses a production method of a 15CrMoR steel plate for rare earth microalloying hydrogen-contacting equipment with excellent high-temperature performance. The production method comprises the steps of KR desulfurization, converter smelting, LF refining, RH refining, continuous casting, slow cooling in a heat preservation pit, heating, rolling, cooling, hot straightening, shearing, flaw detection, normalizing and tempering. The steel comprises the following chemical components in percentage by mass: 0.15-0.17% of C, 0.20-0.30% of S i, 0.50-0.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.019-0.029% of Al s, 0.9-1.1% of Cr, 0.50-0.60% of Mo, less than or equal to 0.0020% of Ce, less than or equal to 1.5 ppm of H, less than or equal to 0.0040% of O, less than or equal to 0.0060% of N and the balance of Fe. And the balance of iron impurities. A normalizing and tempering heat treatment process is adopted, and a low-carbon component design is adopted to ensure that the steel plate obtains excellent high-temperature performance and welding performance.

The invention discloses a converter steelmaking molten pool carbon content detection method and system, a medium and a terminal, and the method comprises the steps: responding to a converter steelmaking signal, starting a three-section model, and obtaining the height of an oxygen lance and the oxygen flow of the oxygen lance in real time in the converter steelmaking process; a first carbon content detection value of a molten pool in the converter at the current moment is obtained through real-time analysis by utilizing a three-section type model and combining the height of an oxygen lance, the oxygen flow of the oxygen lance, the weight of waste steel added into the converter, the weight of molten iron and the carbon content; when the converter is in the last steelmaking stage, if a detection signal sent by the detection equipment is received, a second carbon content detection value of the molten pool in the converter at the current moment is obtained through real-time analysis based on the detection signal, and the first carbon content detection value and the second carbon content detection value are fused to obtain a carbon content detection result of the molten pool at the current moment. According to the method, the influence of the oxygen lance position, the oxygen flow and feeding on the decarburization rate is considered, the carbon content detection in the whole steelmaking process is realized, and the detection precision in the last steelmaking stage is optimized.

The invention discloses a converter steelmaking endpoint forecasting method and device and a storage medium, and the method comprises the steps: carrying out the multi-scale importance modeling and graph attention mechanism modeling of the multi-dimensional process characteristics of the current heat, and generating the importance weight and the structure perception weight of each dimension of process characteristics; fusing the importance weight and the structure sensing weight, and multiplying the fused weight with the corresponding dimension process characteristics to generate a characteristic regulation and control vector of the current heat; performing multi-scale convolution operation on the feature regulation and control vector, extracting local mode features under different receptive fields, and outputting a spatial feature vector after the local mode features are enhanced by a self-attention mechanism; a plurality of groups of Transformer encoders are adopted to respectively process the furnace feature sequences with different historical window lengths, and cross-furnace time sequence feature vectors are extracted; and carrying out dimension alignment on the spatial feature vector and the time sequence feature vector, carrying out dimension-by-dimension weighted fusion through a learnable fusion weight, and outputting a steelmaking end point state prediction value of the current heat through a regression prediction network.

The invention discloses a V-B-Ti microalloyed 690 MPa grade steel for engineering machinery, and belongs to the field of metal processing. The steel comprises the following chemical components in percentage by weight: 0.13%-0.17% of C, 0.15%-0.25% of Si, 1.55%-1.7% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.017%-0.0250% of Ti, 0.1%-0.2% of Cr, 0.015%-0.045% of Als, 0.05%-0.08% of V, 0.0015%-0.0020% of B, 0.005%-0.0095% of N, 3.4%-3.8% of Ti / N and the balance of Fe and inevitable impurities, the total amount of other impurity elements is less than 0.05%, and the problems of low steel plate toughness and plate shape unevenness are solved.

The application relates to a method for smelting high-manganese steel in a converter, and belongs to the technical field of steelmaking. The technical problem to be solved by the application is that the manganese content of end-point molten steel produced by a converter in the prior art is low. The technical solution provided by the application for solving the above technical problem is that carbon balls and high-carbon ferromanganese are added in stages according to oxygen supply amount in the smelting process of the converter, when the oxygen supply amount is within 0-10% and 10-80%, 30% and 70% of manganese alloy are respectively added; and when the oxygen supply amount is within 0-10%, 10-50%, 50-80% and 80-100%, 20%, 40%, 30% and 10% of carbonaceous raw materials are respectively added. Compared with the current process for producing high-manganese steel in a converter, the application reduces the investment of alloy heating furnaces and other equipment, meets the production requirements of more varieties of high-manganese steel, improves the metal yield of manganese, shortens the production cycle, and reduces the production cost of high-manganese steel.

The invention discloses a production method of microalloy rare earth Ce high-strength steel. The production method comprises the following steps: 1) a smelting process; (2) refining; 3) continuous casting and casting blank treatment; 4) cooling the casting blank; (5) rolling and heat treatment are conducted, specifically, rough rolling is conducted through a 3800 mm four-roller reversible rolling mill, the initial rolling temperature is 1050-1150 DEG C, and the reduction rate is larger than or equal to 25%; finish rolling: a 4100mm four-roller mill is adopted, the finish rolling temperature is 850-900 DEG C, and the thickness tolerance is + / -0.5 mm; cooling control is conducted, laminar flow accelerated cooling is adopted, the cooling rate is 15-25 DEG C / s, the final cooling temperature is 500-600 DEG C, and grain coarsening is inhibited; quenching: performing oil quenching to 150 DEG C or below, wherein the cooling rate is greater than or equal to 20 DEG C / s; and tempering: carrying out heat preservation at 620 DEG C for 30 minutes, and carrying out air cooling. The invention aims to prepare the high-strength steel which not only meets the strength requirement but also has good processability and economic benefits by accurately controlling the addition amount of the rare earth element Ce and production process parameters.

The invention relates to a multi-modal information fusion converter intelligent steelmaking method, belongs to the technical field of converter steelmaking, and solves the problem of low parameter prediction precision in the prior art. Screening the heat data with the historical slag thickness value and the production time meeting the requirements from the historical heat data to obtain a self-learning library of the corresponding steel grade; based on the data of each heat in the self-learning library and the historical mean value and the required value of each parameter of the to-be-produced steel grade, the modulus increment of each heat in the self-learning library is obtained; obtaining the weight of each heat in the self-learning library based on the modulus increment of each heat; on the basis of the weight of each heat and data of each heat in a self-learning library, obtaining standard heat data of the steel grade to be produced; and on the basis of the standard heat data and the technological requirements of the current production heat, the predicted values of the parameters in the current production heat are obtained, and the steelmaking process is conducted on the basis of the predicted values of the parameters. And accurate parameter prediction is realized.

The invention relates to the technical field of high-strength steel production, in particular to 780MPa-grade forming-enhanced cold-rolled dual-phase steel and a preparation method thereof.The 780MPa-grade forming-enhanced cold-rolled dual-phase steel comprises the chemical components of 0.09%-0.11% of C, 0.25%-0.45% of Si, 1.9%-2.1% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.006% of S, 0.03%-0.05% of Als, smaller than or equal to 0.005% of N, 0.25%-0.35% of Cr, 0.015%-0.025% of Nb, 0.08%-0.12% of Cu and 0.05%-0.09% of Ni, and the ratio of Nb to Cr is 1: 10-1: 12; ceq is equal to 0.38%-0.42%, and the balance is Fe and impurities; the core objective of the invention is to enable the work hardening index n value to be greater than or equal to 0.24 through component collaborative optimization and process precise regulation and control, so that the industrial pain points of insufficient reaming performance and poor formability of the existing 780MPa-grade cold-rolled dual-phase steel are fundamentally solved, and meanwhile, the alloy cost is reduced, and the manufacturability is improved.

The utility model relates to the technical field of slag-stopping plugs, in particular to a storage device for slag-stopping plugs in converter production, which comprises a first tripod, a second tripod and six steel plate modules arranged between the first tripod and the second tripod, four placing holes are arranged on the inner wall of each steel plate module, and slag-stopping plug bodies are clamped on the inner walls of the placing holes. The outer sides of the first tripod and the second tripod are provided with assembling mechanisms used for being connected with the steel plate modules, the outer sides of the steel plate modules are provided with clamping mechanisms used for expanding the storage hole positions, the two tripods, the steel plate modules and the placing holes are arranged, slag stopping plugs can be stored in order, operation is convenient, the occupied space behind a converter is reduced, and the service life of the converter is prolonged. The bottleneck of storing and taking the converter slag stopping cone is solved, the operation area of a converter slag stopping area is increased, potential safety hazards in the storing and taking process are eliminated, the field environment is improved, the operation efficiency is improved, and the labor intensity of workers is reduced.

The invention relates to the technical field of metallurgy, in particular to a hot galvanizing low-alloy high-strength steel plate which comprises the following chemical components in percentage by mass: 0.06%-0.08% of C, 0.20%-0.25% of Si, 1.20%-1.35% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020%-0.060% of Alt, 0.035%-0.050% of Nb, 0.010%-0.020% of Ti, less than or equal to 0.0050% of O, less than or equal to 0.0060% of N and the balance of Fe and inevitable impurities. The contents of C, Si and Mn in the chemical components are controlled, the welding performance of the hot-dip galvanizing low-alloy high-strength steel and the surface quality of a finished product are considered, Nb microalloying is mainly adopted, a proper amount of microalloy element Ti is added to form TiN, austenite grain coarsening is limited in the slab heating and heat preservation process, and fine and dispersed precipitated phases are finally obtained in combination with process control; the hot-dip galvanized low-alloy high-strength steel finished product is good in structure form and excellent in comprehensive performance.

The invention belongs to the technical field of ferrous metallurgy, and discloses an intelligent self-adaptive converter smelting fire point area temperature monitoring system and method.The intelligent self-adaptive converter smelting fire point area temperature monitoring system comprises an oxygen lance, a gas supply module, a cooling module, a communication module and an edge calculation module, and the gas supply module and the cooling module are both connected with the oxygen lance; a multi-mode temperature sensor set is integrated in the oxygen lance, a communication module is installed on the outer side of the oxygen lance, and the cooling module, the air supply module and the multi-mode temperature sensor set are all in communication connection with the edge calculation module through the communication module. The technical scheme provided by the invention has the characteristics of high real-time performance, high intelligence, good safety and the like, and is suitable for a modern converter smelting process.

The invention relates to the technical field of ferrous metallurgy, and discloses a converter endpoint carbon content and temperature online prediction method based on multi-modal data. The method comprises the following steps: collecting visual image data, flame spectrum data and blowing process parameter data of furnace mouth flames in the blowing process of a converter to form multi-modal data; accurately positioning and segmenting a flame region by using a target detection and segmentation model, and extracting visual features and spectral features corresponding to the space according to the flame region; the visual features, the spectral features and the process parameters are fused and preprocessed and then input into a pre-trained symbol regression prediction model, and an end point carbon content prediction value and an end point temperature prediction value are obtained; on-line operation guidance information for adjusting the process parameters is generated based on the deviation between the predicted value and the target value and the input parameter sensitivity. According to the method, the end point prediction precision and interpretability are improved, the online control requirement of the converter is met, the end point double hit rate of the converter is effectively improved, and a closed loop from intelligent prediction to intelligent control is achieved.

The invention relates to a wide ultra-thin specification tinplate and a preparation method thereof. A tinplate base material comprises the following chemical components: 0.0010%-0.0014% of C, less than or equal to 0.02% of Si, 0.09%-0.14% of Mn, less than or equal to 0.015% of P, less than or equal to 0.004% of S, 0.0146%-0.0158% of N, 0.0038%-0.0049% of B, 0.015%-0.045% of Alt, 0.0012%-0.0024% of Mg and 0.077%-0.094% of Ti. And the balance of Fe and impurities. The produced wide and ultra-thin tinplate (the thickness is 0.08-0.18 mm, and the width is larger than or equal to 2000 mm) has good structure and performance uniformity, and the alloy cost of the tinplate base material is low; and meanwhile, the problems of quality defects such as strip breakage, holes and bright strips in the cold rolling annealing process of a conventional production process are solved.

The invention discloses a thermal shock resistant magnesia carbon brick for a steelmaking converter and a preparation method of the thermal shock resistant magnesia carbon brick, relates to the technical field of refractory materials, and aims to solve the problem that the overall service life of a furnace lining of the steelmaking converter is unbalanced due to the short service life of the magnesia carbon brick in a thermal shock concentrated area. The refractory material is prepared from the following raw materials in percentage by weight: 15 to 30 weight percent of high-purity magnesite clinker, 20 to 40 weight percent of high-purity magnesite clinker, 20 to 25 weight percent of high-purity magnesite clinker, 10 to 20 weight percent of fused magnesite, 8 to 16 weight percent of graphite, 0.5 to 1.5 weight percent of zirconium oxide powder, 1 to 3 weight percent of alpha alumina powder, 1 to 4 weight percent of antioxidant and 3 to 6 weight percent of phenolic resin. The magnesium carbon brick microstructure is constructed, the toughness mechanism is improved, the thermal shock resistance of the product is improved, and the service life of the converter lining tends to be balanced.

The present application relates to the technical field of metallurgy, and particularly relates to a production method of a large-wall-thickness pipeline steel with improved carbon dioxide corrosion resistance and strength and toughness, and specific measures include: (1) controlling the bottom blowing mode and end point requirement in the converter process; (2) controlling the tapping time and replacing the tapping hole opportunity in the tapping process; (3) feeding the CAS aluminum wire and controlling the CAS argon blowing time; (4) controlling the top slag addition amount, heating time and outgoing mode in the LF refining process; (5) controlling the wire feeding parameters, soft blowing time and outgoing requirement of RH in the RH refining process; (6) controlling the precision requirement, casting speed fluctuation and crystallizer liquid level fluctuation of the continuous casting equipment in the continuous casting process to obtain the casting blank. Through controlling the parameters of each process in the smelting and rolling process, the present application realizes the whole-process steel cleanliness control and ladle grain refinement, and further improves the strength, low-temperature toughness, HIC resistance and carbon dioxide corrosion resistance of the large-wall-thickness pipeline steel.

The invention relates to the technical field of steel pipe production, and particularly discloses a production process of a seamless steel pipe special for a high-temperature-resistant and high-pressure-resistant boiler. Under preset process parameters, a clamping mechanism is used for driving a steel billet to rotate and axially feed in, and the steel billet is symmetrically and synchronously beaten through a plurality of hammer heads, so that the steel billet is formed into a round billet; heating and perforating the round billet to obtain a pierced billet; and the pierced billet is sequentially fed into a hammerhead machine and a cold-drawing machine to be subjected to heading and drawing so as to conduct sizing on the steel pipe. The steel pipe is produced by combining a hammering forging mode with a perforating mode, and a plurality of synchronous symmetrical hammers are used for hammering, so that dynamic recrystallization and grain refinement are realized, the compactness of a steel pipe material is improved, and the high-temperature resistance and the pressure resistance of the steel pipe are improved; the circular-arc-shaped hammer head is adopted to be matched with the curvature of the steel billet, stress concentration is avoided, one-time circle forging, punching and sizing of the steel billet are achieved, the advantage of procedure integration is achieved, and the production efficiency is improved.

The invention discloses a method, a device and equipment for inhibiting slag overflow of a converter and a medium, and belongs to the technical field of metallurgy. The method comprises the steps that the actual smelting time of a converter of the current heat is obtained; if the actual duration is within the preset easy-to-overflow-slag duration interval, the smelting parameters of the converter are adjusted to be target smelting parameters, the current overflow slag characteristic value of the converter of the current heat is obtained, and the current overflow slag characteristic value is used for representing the current overflow slag strength; if the current slag overflow characteristic value is larger than a preset characteristic value threshold value, the duration when the current slag overflow characteristic value is larger than the characteristic value threshold value is calculated; and if the duration is greater than a preset duration threshold value, giving an alarm to inform an operator to start a slag overflow suppression measure. According to the method, when the actual time length of the converter enters a time length interval section where slag overflowing is prone to occurring, smelting parameters of the converter are adjusted, slag overflowing prevention operation is started in advance, and if the effect of restraining in advance is not good, an operator is notified to conduct manual restraining operation.