3495results about "Heat treatment process control" patented technology

The invention discloses a metal surface quality detection method and system, and relates to the technical field of metal surface quality detection. The method is used for solving the problems of low microdefect detection precision, weak technological parameter relevance and closed-loop control deficiency of the high-reflection surface. The metal surface is irradiated through multi-angle coherent light field serialization, the phase offset of interference fringes is analyzed to generate three-dimensional shape data, and reflection noise interference is restrained. Defect depth gradient is extracted based on dynamic segmentation of process parameter constraint, deposition temperature and pressure deviation are quantified through deconvolution calculation, and process deviation feature distribution is constructed. Finite element simulation is utilized to generate a process-morphology mapping atlas library, cross-domain invariance features are extracted through depth constraint manifold alignment and comparative learning, and a causal correlation model of defect types and process parameters is established. And dynamically adjusting process parameters according to the weight gradient, and reflowing data to update the manifold rule. And high-precision three-dimensional defect detection, process deviation traceability and adaptive parameter optimization are realized.

The invention discloses a steel wire rod for a 2400-2460 MPa grade stress corrosion resistant prestressed steel strand, the steel strand and a production method. The steel wire rod comprises the following chemical components in percentage by weight: 0.90-0.97% of C, 0.6-1.2% of Si, 0.2-0.8% of Mn, 0.15-0.45% of Cr, 0.02-0.05% of V, 0.01-0.05% of Nb, less than 0.30% of Ni, less than 0.30% of Cu, less than 0.30% of Mo, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.004% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities. By optimizing the chemical components and the production process of the wire rod, the strength of the prepared steel strand meets 2400-2460 MPa, the minimum stress corrosion value is 2.5 hours, the median value is 5 hours, and the stress corrosion resistance is obviously superior to that of an existing steel strand.

The invention discloses a steel wire rod for a 2300-2360 MPa grade stress corrosion resistant steel strand, the steel strand and a preparation method. The steel wire rod comprises the following chemical components in percentage by mass: 0.85-0.91% of C, 0.3-1.0% of Si, 0.2-0.8% of Mn, 0.15-0.45% of Cr, 0.02-0.05% of V, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.004% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities. The steel wire rod has excellent strength and plasticity, the ultrahigh strength of 2300 MPa or above can be obtained through drawing with a small area reduction rate, surface damage and internal defects of the steel wire rod during subsequent drawing machining are reduced, and the stress corrosion index of the steel strand is improved.

The invention discloses a steel wire rod for a 2200-2260 MPa grade ultrahigh stress corrosion resistance prestressed steel strand, the steel strand and a production method of the steel strand, and the steel wire rod comprises the following alloy components in percentage by mass: 0.83-0.89% of C, 0.60-1.40% of Si, 0.20-0.80% of Mn, 0.15-0.50% of Cr, less than 0.30% of Cu, less than 0.30% of Ni, less than 0.30% of Mo, 0.01-0.05% of V, 0.001-0.05% of Nb, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.0040% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities, through component design and a reasonable after-rolling controlled cooling process, the microstructure is refined, the sorbite rate is improved, high strength and plasticity are obtained with low carbon content, the drawing deformation can be reduced, material damage can be reduced, and the corrosion resistance of the steel strand is improved.

The invention relates to the technical field of metal forge piece machining, in particular to an irregular metal forge piece heat treatment method and system.The irregular metal forge piece heat treatment method comprises the steps that firstly, temperature compensation partitions are divided according to geometrical characteristics, and stepped preheating is implemented to establish a uniform basic temperature field; then, the heat preservation time of each subarea is independently regulated and controlled in the austenitizing stage, and sufficient transformation of a thick-wall area structure and control over the grain size of a thin-wall area are both considered; in the quenching process, partition strength adjustment is carried out based on a preset cooling map, and cooling parameters are dynamically optimized through real-time feedback; and finally, according to the residual stress distribution, carrying out partition stepped tempering. The heating and cooling uniformity is remarkably improved through partition dynamic temperature management, and the structure difference and thermal stress concentration caused by section sudden change are effectively inhibited; the microstructure is ensured to be uniform and stable through austenitizing control; the hardenability and the deformation resistance are balanced through a differential cooling strategy; and directional reduction of residual stress is achieved through an intelligent tempering mechanism, and the cracking risk is greatly reduced while the comprehensive mechanical property is improved.

The invention relates to the technical field of steel production and processing, and discloses an electrical steel strip annealing temperature real-time monitoring and regulation system. The system comprises a temperature data acquisition module which is responsible for acquiring temperature and cooling rate data in an annealing process and acquiring expected parameters; the temperature deviation analysis module is used for calculating a deviation coefficient through a dynamic weighting algorithm to construct a matrix; the dynamic regulation and control module is used for generating regulation and control parameters based on a fuzzy logic control algorithm; the abnormity grading module is used for grading annealing abnormity; and the real-time feedback module transmits the regulation and control parameters and the abnormal identifier to the control end. The system also has the functions of adjusting a rule base according to the characteristics of the steel strip, backtracking historical data, optimizing regulation and control, adaptively updating an abnormal threshold value and the like. Through cooperative work of all the modules, real-time monitoring and accurate regulation and control of the annealing temperature are achieved, the annealing quality and production efficiency of the electrical steel strip are improved, and the cost is reduced.

The invention discloses a nodular cast iron pipe continuous annealing furnace temperature distribution optimization control system and method, and belongs to the technical field of temperature control, and the system comprises a temperature detection module, a data processing module, a control module and a fault diagnosis module; the temperature detection module is used for collecting temperature data in the nodular cast iron pipe annealing furnace in real time; the data processing module is used for preprocessing and analyzing the collected temperature data and constructing a temperature distribution model; the control module comprises a temperature optimization unit and an energy optimization unit; the temperature optimization unit is used for calculating the temperature adjustment amount according to the real-time temperature distribution condition in the furnace in the length direction, the radial direction and the circumferential direction, and formulating a partition heating and local compensation strategy; the energy optimization unit is used for dynamically adjusting the heating power according to the change of the production takt, and generating a dynamic heating strategy; the fault diagnosis module is used for monitoring the operation state of the nodular cast iron pipe annealing furnace in real time and conducting fault detection.

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 1960MPa-grade stranded wire and a manufacturing method of the high-strength complex-phase hot-rolled wire rod. After high-carbon components containing trace B are designed, rolled and spun into a wire rod, online molten salt rapid quenching treatment is carried out, and the wire rod is firstly subjected to front-section molten salt treatment, so that the wire rod is cooled at the cooling speed of greater than or equal to 36 DEG C / s and enters a bainite and pearlite mixed phase region from an austenite state; the method comprises the following steps: quenching a steel wire rod to form a structure mainly comprising quenched bainite and a sorbite structure, carrying out rear-section molten salt treatment on the steel wire rod, increasing the molten salt temperature, promoting isothermal tempering of the quenched bainite and the sorbite structure, and carrying out roller way slow cooling to prepare the hot-rolled steel wire rod of which the microscopic structure comprises a complex-phase structure consisting of tempered sorbite, tempered bainite and ferrite, the composition system can be simplified, the strength and plasticity matching and rapid production of the wire rod are considered, the tensile strength is 1330-1380 MPa, the percentage reduction of area is 35%-40%, and the wire breaking risk in the wire drawing and twisting process of the stranded wire steel can be reduced.

The invention discloses a steel wire rod for a 2500-2560 MPa grade stress corrosion resistant prestressed steel strand, the steel strand and a production method. The steel wire rod comprises the following chemical components in percentage by mass: 0.95-1.02% of C, 0.8-1.5% of Si, 0.5-1.0% of Mn, 0.25-0.45% of Cr, 0.02-0.08% of V, 0.01-0.05% of Nb, less than 0.30% of Ni, less than 0.30% of Cu, less than 0.30% of Mo, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.004% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities. By optimizing the chemical components and the production process and refining the microscopic structure, the steel strand prepared from the steel wire rod has high tensile strength, the minimum stress corrosion value is 2.5 hours, the median value is more than 5 hours, and the steel strand shows excellent stress corrosion resistance.

The invention discloses a rolling and annealing treatment process for a copper-steel composite strip, and relates to the technical field of material rolling, the process comprises the following steps: selecting a high-purity copper plate and a stainless steel plate, and depositing a nano nickel / graphene composite transition layer through a magnetron sputtering technology; the stainless steel layer is promoted to deform through front-section low-speed high-pressure rolling, and the copper layer interface bonding force is improved through rear-section high-speed low-pressure rolling; performing short-time local annealing by using a high-frequency induction coil; honeycomb-shaped micro-pits are formed in the stainless steel surface through the laser micro-texture technology, and the interface bonding force is improved in combination with the nano-nickel / graphene layer. Copper layer hardening is eliminated through low-temperature annealing, stainless steel recrystallization is promoted through medium-temperature annealing, and a nanometer precipitated phase is fixed through rapid water cooling; the heating rate is controlled, and nitrogen-hydrogen mixed gas is used for preventing oxidation; the rolling process and the annealing process are seamlessly connected, and the temperature, the stress and the atmosphere are detected in real time through an online monitoring system. The mechanical property, the corrosion resistance and the machining stability of the copper-steel composite strip are remarkably improved.

The high-steel-grade low-cost hot-rolled coil plate comprises the following chemical components: 0.040 to 0.065 percent of C, 0.20 to 0.35 percent of Si, 1.48 to 1.75 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of S, 0.012 to 0.025 percent of Ti, 0.035 to 0.055 percent of Nb, 0.005 to 0.008 percent of RE, 0.15 to 0.20 percent of Cr, 0.0005 to 0.0020 percent of B, 0.002 to 0.004 percent of Mg, 0.025 to 0.050 percent of Als, less than or equal to 0.003 percent of Ca, less than or equal to 0.008 percent of N and the balance of Fe and inevitable impurities. The technological process comprises the steps of smelting, slab continuous casting, slab heating, rolling, cooling and coiling. Rt0.5 of the steel is 580-660 MPa, Rm is 650-750 MPa, A50 mm is larger than or equal to 28%, Rt0.5 / Rm is smaller than or equal to 0.90, the impact energy mean value Akv at the temperature of-40 DEG C is larger than or equal to 200 J, the drop weight DWTT mean value at the temperature of-20 DEG C is larger than or equal to 90%, the hardness value HV10 is smaller than or equal to 220, and the cold bending performance is qualified. The product provided by the invention has high strength and toughness and good welding performance, so that the product is more suitable for various complex and extreme service environments, and has higher safety in pipeline engineering.

The invention relates to a 1200MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, after V-containing chemical components are designed, rolled and spun into a wire rod, the wire rod is subjected to online molten salt isothermal quenching treatment, and the wire rod is controlled to enter a bainite phase region from a high-temperature austenite state at a cooling speed greater than or equal to 32 DEG C / s; the steel wire rod with a microscopic structure comprising tempered bainite and ferrite is prepared through isothermal tempering, toughening and destressing treatment, carbide precipitation control and roller way cover opening and slow cooling, so that generation of deteriorated structures such as martensite can be avoided, the structure state can be effectively adjusted, strong plasticity matching of the steel wire rod is achieved, and the service life of the steel wire rod is prolonged. And the tensile strength is 1120-110MPa, the percentage reduction of area is 63-67%, and the steel is suitable for the application fields of manufacturing 1200MPa-grade high-strength tool steel and the like, and is favorable for being directly processed into tool parts after being subjected to cold processing molding.

The invention discloses a low-cost 450MPa-grade hot-rolled coil plate for a welded pipe and a manufacturing method thereof, and the low-cost 450MPa-grade hot-rolled coil plate comprises the following chemical components: 0.08 to 0.10 percent of C, 0.2 to 0.4 percent of Si, 1.4 to 1.6 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of S, 0.01 to 0.03 percent of Ti, 0.020 to 0.040 percent of Nb, 0.003 to 0.005 percent of RE, 0.15 to 0.25 percent of Cr, 0.002 to 0.004 percent of Mg, 0.01 to 0.04 percent of Als, less than or equal to 0.003 percent of Ca, less than or equal to 0.008 percent of N, less than or equal to 0.15 percent of (Nb + Ti + C + N) and the balance of Fe and inevitable elements. The manufacturing method comprises the steps of smelting, slab continuous casting, casting blank heating, rolling, cooling and coiling. The Rt < 0.5 > of the steel is 450-550 MPa, the Rm is 550-650 MPa, the A50mm is larger than or equal to 30%, the ratio of the Rt < 0.5 > to the Rm is smaller than or equal to 0.90, and the impact energy average value Akv at the temperature of-30 DEG C is larger than or equal to 200 J.

The invention relates to a 1100MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, the wire rod adopts a middle-carbon Nb-V-containing chemical component design, after a steel billet is rolled and spun into the wire rod according to the spinning temperature of more than or equal to 860 DEG C, online molten salt semi-quenching isothermal treatment is performed, the wire rod is controlled to be subjected to front-section molten salt treatment, and then the steel wire rod is subjected to hot rolling and hot rolling to obtain the 1100MPa-grade high-strength tool steel wire rod. According to the method, the steel wire rod enters a bainite phase region from a high-temperature austenite state at the cooling speed of more than or equal to 30 DEG C / s to form a structure taking quenched bainite as a main component, and then is subjected to rear-section molten salt heating isothermal tempering and toughening destressing treatment, and finally is subjected to roller way slow cooling to prepare the steel wire rod with a microscopic structure comprising tempered bainite and ferrite, so that the material cost can be reduced, and the production efficiency is improved. The method has the advantages that martensite brittle structures are effectively avoided, the structure state of the hot-rolled wire rod is controlled, the plasticity and cold working performance of the wire rod are improved, the tensile strength of the product can reach 980-1030 MPa, the percentage reduction of area is 61%-66%, and the product can be directly machined into tool parts after cold forming.

The invention discloses an alloy for a 2230 MPa-grade high-corrosion-resistance steel strand, a wire rod, the steel strand and a method, and the alloy comprises the following components in percentage by mass: 0.89-0.93% of C, 1.20-1.40% of Si, 0.50-0.70% of Mn, 0.30-0.40% of Cr, 0.01-0.04% of V, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.0040% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities. By optimizing the chemical component design and controlling the production process, the homogeneity of the steel is improved, the homogeneity of the wire rod is improved, the purity is improved, meanwhile, surface damage and internal defects during steel wire drawing machining are reduced, and therefore the stress corrosion index of the steel strand is improved.

The invention relates to the technical field of annealing furnace control, in particular to an annealing furnace pressure control method and system.The method comprises the steps that pressure data in all furnace sections of a continuous bright annealing furnace, temperature data of furnace walls at all the furnace sections and flow data at outlets of pressure regulating valves used at all the furnace sections are collected in real time; presetting an adjusting period of a proportion parameter in a PID controller used by a pressure adjusting valve used by each furnace section to obtain each adjusting moment of the proportion parameter; obtaining each synchronous change moment of each furnace section in a time period between each adjustment moment and an adjacent previous adjustment moment, and obtaining a pressure characteristic value of each furnace section at each adjustment moment; obtaining a trend similar characteristic value of each furnace section at each adjustment moment; and obtaining the value of the proportion parameter in the PID controller in the time interval between each adjustment moment and the next adjustment moment adjacent to the adjustment moment so as to control the furnace pressure in each furnace section. The invention aims to improve the control precision of the furnace pressure.

The invention relates to the technical field of digital management, in particular to a digital management system for cold heading and heat treatment processing of fasteners, which comprises a phase deviation identification module, a load regulation and control parameter generation module, a heat treatment efficiency regulation and control module, a defect type association control module and an early warning instruction output module. According to the method, a load change node is positioned through a main shaft angle value, synchronous offset between a main shaft and a slave shaft is identified by combining multi-shaft displacement and load data, an angular displacement point in an impact rhythm, a corresponding speed and a holding time length set value are extracted, and targeted impact regulation and control parameters are formed; in the heat treatment stage, the fluctuation trend of heat conduction efficiency is recognized by combining the surface area and temperature rise data of the fastener, process response establishment of multiple types of defects is achieved by combining the crack size, the hardness value and the surface atlas label in the machining period, and shutdown and feeding interruption signals are issued to the control terminal according to the machining beat continuous triggering condition. Defect closed-loop linkage control in the fastener cold heading and heat treatment process is achieved.

The invention relates to the technical field of magnesium-aluminum alloy heat treatment, and discloses a high-strength and high-conductivity magnesium-aluminum alloy heat treatment method which comprises the following steps: step 1, surface cleaning treatment: carrying out surface cleaning treatment on a magnesium-aluminum alloy workpiece to remove oil stains, impurities and an oxide layer on the surface; secondly, preheating treatment is conducted, specifically, the cleaned magnesium-aluminum alloy workpiece is put into a heating furnace, the temperature is slowly increased to 200 DEG C at the temperature increasing speed of 10 DEG C / min, and heat preservation is conducted for 1-2 hours at the temperature; thirdly, the temperature is rapidly increased to the solid solution temperature, and after preheating treatment is completed. Precipitated phase distribution is optimized through two-stage aging treatment, a precipitated phase is preliminarily formed through low-temperature short-time aging, then the precipitated phase is uniformly grown through high-temperature long-time aging, local aggregation is avoided, meanwhile, solution treatment and quenching cooling are optimized, uniform dissolution of solute atoms is ensured, the alloy strength and hardness are improved, and the service life of the alloy is prolonged. And the fatigue resistance and the crack propagation resistance are remarkably improved through uniform precipitated phase distribution.

The invention relates to the technical field of advanced high-strength steel for automobiles. The invention relates to cold-rolled dual-phase steel DP780 with low cost and high surface. The cold-rolled dual-phase steel DP780 comprises the following chemical components in percentage by mass: 0.10 to 0.15 percent of C, 0.20 to 0.40 percent of Si, 1.60 to 1.80 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.004 percent of S, 0.015 to 0.035 percent of Al, 0.010 to 0.025 percent of Ti, 0.005 to 0.015 percent of Nb, less than or equal to 0.006 percent of N, less than or equal to 0.0003 percent of H and the balance of iron and inevitable trace impurities. The invention further provides a production method of the low-cost high-surface cold-rolled dual-phase steel DP780. The production method comprises the technological processes of smelting, continuous casting, casting blank reheating, rough rolling, finish rolling, cooling and coiling after rolling, hot coil acid continuous rolling and rolled hard coil continuous annealing. The 780MPa-grade cold-rolled dual-phase steel has the beneficial effects that the 780MPa-grade cold-rolled dual-phase steel which is small in alloy adding amount and easy to control steelmaking casting, hot rolling and continuous annealing can be stably obtained, and the use requirements of automobile parts are met.

The invention discloses an intelligent temperature control system and method for a non-oriented silicon steel continuous annealing process, and relates to the technical field of non-oriented silicon steel temperature control, the intelligent temperature control system comprises a multi-source sensing fusion acquisition module, data are acquired through multi-modal sensing and edge calculation, a depth space-time modeling module is used for modeling prediction through LSTM and GNN, and the temperature of the non-oriented silicon steel continuous annealing process is obtained. The intelligent cooperative regulation and control module combines reinforcement learning with MPC temperature control and further comprises a monitoring feedback module, a multi-dimensional early warning module and a data insight optimization module, and all the modules work cooperatively. According to the invention, the temperature control precision is improved, the defective rate is reduced, the production efficiency is improved, the energy consumption is reduced, the quality is scientifically monitored, the parameters are adaptively adjusted, the remote operation is realized, and the continuous annealing temperature control of the non-oriented silicon steel is comprehensively optimized.

The invention relates to a hot-rolled wire rod for a 2100MPa-grade stranded wire and a manufacturing method thereof, after a high-carbon and high-silicon component system is rolled and spun into a wire rod, the wire rod is cooled at a cooling speed of more than or equal to 31 DEG C / s through online molten salt sorbite regulation and control treatment, and enters a sorbite phase region from an austenite state; the method comprises the following steps of: forming a structure mainly comprising a sorbite structure, performing isothermal tempering, promoting fusing of a part of sorbite lamellas, and finally performing roller way cover opening and slow cooling to prepare the hot-rolled wire rod of which the microscopic structure comprises a mixed structure consisting of tempered sorbite, tempered ferrite and fused sorbite, so that alloy components can be simplified, and the strong plasticity matching and the structure uniformity of the wire rod can be improved; the tensile strength is 1420-1470 MPa, the percentage reduction of area is 36%-41%, the composite material is used for the application field of manufacturing 2100 MPa grade stranded wires and the like, off-line heat treatment can be avoided, and the risk of wire breakage during downstream drawing and twisting is reduced.

The invention relates to the technical field of advanced high-strength steel for automobiles. The invention relates to cold-rolled dual-phase steel DP980 with low cost and high surface. The cold-rolled dual-phase steel DP980 comprises the following chemical components in percentage by mass: 0.07 to 0.10 percent of C, 0.30 to 0.60 percent of Si, 2.00 to 2.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.015 to 0.035 percent of Al, 0.010 to 0.040 percent of Nb, 0.010 to 0.040 percent of Ti, 0.10 to 0.30 percent of Cr, less than or equal to 0.006 percent of N, less than or equal to 0.0003 percent of H and the balance of iron and inevitable trace impurities. The invention provides a production method of low-cost high-surface cold-rolled dual-phase steel DP980. The production method comprises the technological processes of smelting, continuous casting, casting blank reheating, rough rolling, finish rolling, cooling and coiling after rolling, hot coil acid continuous rolling and rolled hard coil continuous annealing. The 980MPa-grade cold-rolled dual-phase steel has the beneficial effects that the 980MPa-grade cold-rolled dual-phase steel which is small in alloy adding amount and easy to control steelmaking casting, hot rolling and continuous annealing can be stably obtained, and the use requirements of automobile parts are met.

The invention provides a rolling stress relief and plate shape flatness coordinated optimization method in a strip steel annealing process, which comprises the following steps of: performing segmented dynamic tension control, dual-frequency electromagnetic field temperature control, gradient pulse stress reconstruction and electromagnetic-pulse multi-target coupling optimization; the problems that heat conduction lags behind, residual stress release is not thorough and flatness control is insufficient in a traditional process are solved, and the method has the advantages that stress elimination and plate shape control are synchronously optimized, recrystallization uniformity is improved, and residual stress is reduced.

The invention discloses an intelligent monitoring method for an annealing process of a wound transformer iron core, and particularly relates to the technical field of intelligent monitoring. The method comprises the following steps: acquiring temperature data and magnetic field intensity data generated in an annealing process of a wound transformer iron core, and carrying out time domain synchronization processing and abnormal data labeling; identifying an iron core micro-deformation area and a corresponding temperature anomaly area according to the synchronous data, and extracting temperature anomaly fluctuation characteristics; analyzing a dynamic coupling relationship between the temperature abnormal fluctuation characteristic and the iron core stress change, and outputting characteristic data of an iron core magnetic field and stress interaction; synchronously analyzing the interference intensity of abnormal temperature fluctuation on the annealing heat distribution uniformity, and outputting temperature disturbance intensity data; and constructing a coupling anomaly evolution model, generating iron core annealing anomaly evaluation data, quantifying a quality fluctuation risk in an annealing process, and generating intelligent early warning information. The monitoring precision and reliability of the iron core annealing process are effectively improved, and the annealing quality of the transformer iron core is guaranteed.

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 discloses post-processing equipment for a rolled strip, relates to the technical field of strip rolling post-processing, and aims to solve the problems of waved edge warping and overall warping caused by non-uniform residual stress distribution of edge and central areas after a metal strip is rolled in the prior art. Comprising a gradient annealing device and an edge stress grading regulation and control device, the gradient annealing device at least comprises a plurality of heating roller groups; the plurality of heating roller groups are arranged at equal intervals along the moving direction of the strip, each heating roller group comprises two heating rollers, the two heating rollers respectively heat the upper surface and the lower surface of the rolled strip, each heating roller at least comprises a magnetic induction coil, and the coil density of the magnetic induction coil is gradually reduced from the edge part to the middle part; the edge stress grading regulation and control device at least comprises a plurality of edge pressing roller sets arranged in the strip moving direction. The included angle between each edge pressing roller set and the width direction of the strip is gradually reduced in the moving direction of the strip. The method is used for realizing precise regulation and control of the residual stress.

The invention provides an online detection and compensation method for local decarburization of a high-strength spring steel band, which comprises the following steps: arranging an oxygen content sensor in a continuous annealing furnace to monitor oxygen concentration in real time, and marking a potential decarburization risk section; scanning the risk section steel strip by adopting infrared thermal imaging, and generating a carbon distribution map to position a decarburization area; pulse laser heating is conducted on the decarburization area, and methane-argon mixed gas is introduced to achieve in-situ carburization; and finally, local thermal stress is eliminated through high-frequency induction heating. According to the method, decarburization risk dynamic early warning, defect accurate positioning, local efficient carbon supplementation and stress homogenization control are achieved, and the surface quality and fatigue performance of the steel strip are remarkably improved.

The invention relates to the technical field of metal material heat treatment, in particular to a gradient temperature control method for a stainless steel cold rolling annealing process. Comprising the steps that an annealing furnace is divided into independent temperature control sections in the strip steel conveying direction, each temperature section is provided with an electric heating wire set, a forced convection cooling air duct and a high-precision infrared temperature measurement array, temperature data are collected in real time, and a target gradient temperature curve is generated; constructing a phase change power-temperature correlation model, and outputting a theoretical gradient temperature curve; a three-stage MPC is adopted to cooperatively control and output a control signal; and the heating power and the cooling strength are adjusted in real time according to the control signal, if the temperature fluctuation exceeds the limit, the power is compensated through a PID algorithm, the strip steel speed is adjusted, and closed-loop feedback is formed. Through multi-section independent temperature control, thickness-temperature dynamic modeling and a three-level cooperative control framework, accurate tracking of a gradient temperature curve is achieved, and the quality and efficiency of the annealing process are improved.

The invention discloses a control method and a preparation method for quenching deformation of a die casting, and the control method comprises the following steps: carrying out partitioned cooling on the die casting subjected to solution treatment to obtain the actual deformation of the cooled die casting; a simulation model is established, and the simulation deformation of the die casting is obtained; the simulation deformation amount is compared with the actual deformation amount; carrying out simulation optimization on the partitioned quenching cooling process of the die casting on the basis of the corrected model; performing quenching cooling test on the die casting based on the simulated and optimized partition quenching cooling process, and correcting the partition quenching cooling process based on the result of the cooling rate; performing partition quenching cooling on the die casting on the basis of the corrected partition quenching cooling process, obtaining corrected deformation of the die casting after quenching cooling, and comparing the corrected deformation with design size data of the die casting; and constraint simulation analysis is carried out on the position with the deformation degree larger than 1mm, and a constraint mode with the minimum deformation degree is obtained.

The invention relates to the technical field of low-temperature studs and bolts, and discloses a low-temperature stud steel hardenability optimization treatment method which comprises the steps of S1, a pretreatment method, S2, quenching method optimization, S3, tempering method optimization, S4, a post-treatment method and S5, a performance verification method. According to the method, the low-temperature impact stability is remarkably improved, the low-temperature impact energy of the material at about-100 DEG C can stably reach 35 J or above by accurately controlling the proportion of alloy elements and optimizing the heat treatment process (for example, the tempering temperature is increased to 640 DEG C or above and the heat preservation time is prolonged), the low-temperature impact energy is improved by about 20%-30% compared with a traditional process, and the problem that the low-temperature impact performance of the wire rod fluctuates is thoroughly solved; and the service safety in a low-temperature environment is ensured.