1240results about "Roll force/gap control device" patented technology

The invention relates to the technical field of intelligent manufacturing, in particular to a rolling method, system and equipment in a full-closed mode and a storage medium, and the method comprises the steps that plate thickness and temperature data are collected in real time through a thickness measuring device integrated with a temperature sensor; predicting a future thickness change trend by using a temperature-sensitive deep learning model and combining historical working condition parameters; calculating a dynamic compensation gap sequence based on the prediction result, the target thickness and the compression roller characteristics, and driving a compression roller control system to adjust the gap; and feedback data after rolling are synchronously collected, model parameters are updated in a self-adaptive mode, and closed-loop control is formed. According to the full-closed mode rolling method, high-precision rolling is achieved through closed-loop control, and the quality and efficiency are improved.

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 relates to the technical field of copper rod production, in particular to a high-frequency vibration rolling method, system and equipment for multi-pass continuous rolling of a copper rod, and the method comprises the following steps: acquiring an expected index of the copper rod, establishing a rolling process flow according to the expected index of the copper rod, and distributing continuous rolling passes according to the rolling process flow; calculating and setting corresponding high-frequency vibration frequency and rolling force for each continuous rolling pass; performing hardness detection on the production result of each continuous rolling pass, and calculating the physical structure and performance of the copper rod in the production process according to the hardness detection result; and the high-frequency vibration frequency and the rolling force are fed back and corrected for the fixed continuous rolling pass based on the expected indexes of the copper rod according to the physical structure and the performance of the copper rod. According to the invention, the problems of unstable surface quality, non-uniform crystal grains, energy waste and the like in the traditional copper rod production are effectively solved.

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.

This invention discloses a process for controlling the shape of A514GrQ extra-thick plates for offshore platforms. It uses 800-1000mm thick steel ingots, and after removing and cleaning the ingot risers, ensures uniform thickness of the ingot body, laying the foundation for obtaining steel plates with excellent flatness. The heating process is optimized to ensure uniform heating of the ingot head, middle, and tail, facilitating uniform deformation during rolling. Homogenized rolling is employed to reduce cooling water usage, limit the reduction per pass, and control the final rolling temperature, avoiding uneven internal stress and shape rebound in the steel plate. The final product is a 180-210mm thick steel plate with a maximum flatness ≤8mm and a lateral flatness ≤4mm within a length of 10000mm and a width of 2400mm, significantly reducing subsequent leveling tasks.

The invention provides a production method of 440MPa-grade normalized high-strength structural steel for a ship body, and belongs to the field of ship body structural steel manufacturing, the production process route of the steel comprises smelting, die casting, rolling, rapid cooling, finishing, normalizing and tempering, the thickness of a produced steel plate is 8-20mm, and the steel comprises the following chemical components in percentage by mass: 0.06-0.10% of C; si: less than or equal to 0.40%; mn is equal to 0.90%-1.20%; less than or equal to 0.015% of P; s: < = 0.005%; the ratio of Ni to Cr is (0.90%-1.30%): (0.50%-0.65%); v is equal to 0.030 percent to 0.050 percent; cu is equal to 0.15%-0.35%; n is less than or equal to 0.0040%, and the balance is Fe and inevitable impurities. The microstructure of the steel is a bainite tempered structure and ferrite, and the average grain size of the ferrite is smaller than or equal to 10 micrometers. The yield strength of the steel is larger than or equal to 440 MPa, the tensile strength is larger than or equal to 600 MPa, the yield ratio is smaller than or equal to 0.75, the impact absorbing energy at the temperature of 60 DEG C below zero is larger than or equal to 200 J, the ductile-brittle transition temperature is not higher than 80 DEG C below zero, and a product has good corrosion resistance.

The invention relates to the technical field of titanium alloy rolling processing, and discloses a method for inhibiting surface cracking in the rolling process of a high-strength titanium alloy thick plate, which comprises the following steps: selecting a titanium alloy plate blank, and preheating the plate blank; the preheated plate blank is subjected to surface multi-pass rolling treatment, and the roll gap set in the later-pass rolling treatment is smaller than that in the previous-pass rolling treatment; remelting and heating the plate blank, wherein the heating temperature is higher than the preheating temperature; the plate blank is discharged out of the furnace and subjected to multi-pass rolling, a rolled plate blank is obtained, and the rolling pass rolling reduction is controlled to range from 5 mm to 25 mm; and the rolled plate blank is straightened on line and then air-cooled to the room temperature. According to the method, the surface layer of the plate blank substrate is subjected to structure prefabrication, the surface plasticity is improved, the extensibility in the rolling process is improved, and generation of surface cracks is restrained.

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 a high-precision same-turning roller adjusting mechanism and a pre-stressed rolling mill. The two racks are symmetrically arranged; bearing seat adjusting devices are installed on the portions, corresponding to the two sides of the upper bearing seat, of each rack, and two second-stage worm and gear reduction gearboxes are arranged on the portions, corresponding to the upper bearing seat adjusting devices, of the top of each rack. A first-stage worm and gear reduction gearbox is arranged between the two second-stage worm and gear reduction gearboxes of each rack; worms of the two primary worm and gear reduction gearboxes are connected together through a connecting assembly and used for being connected with a driving device. The two axial sides of a worm wheel of each first-stage worm and gear reduction gearbox extend out to be coaxial with a worm of the corresponding second-stage worm and gear reduction gearbox. And a worm gear of each secondary worm and gear reduction gearbox is in transmission connection with the bearing seat adjusting device. Compared with a straight gear pair, a helical gear pair and the like, the two stages of worm and gear pair transmission mechanisms are arranged, so that the speed ratio is greatly increased, and the adjusting precision of the roller is improved.

The invention discloses a deep reinforcement learning-based self-learning deviation correction control method for a finish rolling strip threading process, and belongs to the technical field of steel rolling automatic control. The control method comprises the following steps: constructing a deep reinforcement learning model by taking a finish rolling rack in the finish rolling strip threading process as an intelligent agent; based on a deep reinforcement learning model, an optimal strategy is generated through interaction of an intelligent agent and a rolling environment; and the optimal strategy is embedded into a self-learning system in the finish rolling strip threading process for real-time correction, so that the strip steel inlet deviation amount is compensated in real time, and the strip steel outlet deviation amount is controlled within the process allowable range. By adopting the technical scheme provided by the invention, the deviation degree of the head of the finish-rolled strip steel can be greatly reduced.

The invention relates to the technical field of metal processing, in particular to a method for producing ultra-thin and ultra-wide limit specification engineering structure steel through a wide and thick plate mill, the method comprises the steps of casting blank heating, rolling, hot straightening and air cooling to the room temperature, in the casting blank heating process, when the casting blank is heated to 1235-1260 DEG C and the gas pressure of a header pipe is 7-9 KPa, the steel tapping rhythm is increased to be larger than or equal to 180 s, and the steel tapping rhythm is increased to be larger than or equal to 180 s; the soaking time and the heating time are 4-4.5 hours, and the total in-furnace time is 5-6.5 hours; when the gas pressure of a main pipe is less than 7KPa, the tapping rhythm is increased to be more than or equal to 230s, the soaking section and heating time is 4.5-5h, the total in-furnace time is 5.5-7h, and the steel billet tapping temperature is more than or equal to 1230 DEG C; the air-fuel ratio is regulated between 1.7 and 2.3, and the temperature difference between the upper surface and the lower surface of the blank is within 15 DEG C; the wide and thick plate rolling mill is used for producing the steel for the engineering structure with the thickness specification of 4-6 mm and the width larger than 3500 mm, and the problems that the steel plate is thin in rolled piece and rapid in temperature reduction, waves are prone to occurring in the production process, the thickness is uneven, and the one-time passing rate and the waste reduction rate of the steel plate are affected are solved.

The invention discloses a method for predicting the thickness of a composite layer of a composite board and related equipment, and relates to the technical field of composite board rolling, and the method comprises the following steps: obtaining assembly thickness data and target hot rolling process parameters of a to-be-measured composite board; inputting the assembly thickness data and the target hot rolling process parameters into a prediction model, and predicting the thickness of the composite plate to obtain a total thickness prediction value after cooling after hot rolling is finished; and based on the total thickness predicted value, calculating to obtain a composite layer thickness predicted value of the composite board. By fusing the assembly data, the hot rolling process parameters and the machine learning algorithm, online prediction and dynamic regulation and control of the thickness of the multi-layer are achieved.

The invention discloses a near-net-shape endless rolling non-oriented electrical steel ultra-thin strip and a preparation method thereof, and belongs to the technical field of metal processing. According to the method, the near-net-shape endless rolling non-oriented electrical steel ultra-thin strip with the finished product thickness being only 0.05-0.15 mm is prepared through the processes of smelting, thin slab continuous casting, endless rolling hot continuous rolling, coiling, online heat preservation, acid pickling, primary cold rolling and continuous annealing, normalizing and secondary cold rolling annealing are not needed in the process, and short-process, low-cost and efficient production can be achieved. The defects that the surface of the non-oriented electrical steel ultra-thin strip is corrugated, the magnetic performance is poor, the surface is scratched and severely narrowed in the annealing process, iron loss is not easy to control, and energy consumption is high are overcome, and the prepared non-oriented electrical steel ultra-thin strip is excellent in magnetic property and can be applied to high-frequency and high-speed motors. And the development requirements of new energy and low-altitude economy are met.

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 invention provides a finite difference-based rapid calculation method and system for an electromagnetic regulation and control roller shape and a rolling condition optimization method and system, and belongs to the field of rolling control. The roller shape rapid calculation method comprises the steps that size parameters, an electromagnetic rod loading form, a regulation mode, regulation parameters and rolling working condition environment parameters of an electromagnetic regulation roller to be regulated are obtained, a geometric model of the electromagnetic regulation roller is established, and the electromagnetic rod loading form, the regulation mode, the regulation parameters and the rolling working condition environment parameters are set in the geometric model; grid division is conducted on the geometric model of the roller, the finite difference theory is introduced, an electromagnetic regulation and control roller shape rapid calculation model is constructed, and temperature field distribution is rapidly solved and calculated through an LU decomposition method; and the roller shape is calculated according to the electromagnetic regulation and control roller shape rapid calculation model and the temperature field distribution. According to the method, online dynamic regulation and control of the electromagnetic regulation and control roller shape under parameter optimization is achieved, and the real-time performance and accuracy of the electromagnetic regulation and control roller shape are improved.

The invention discloses a manufacturing method for improving the cold-rolled edge crack defect of high-silicon phase-change-free electrical steel, which comprises the following steps: converting molten iron by a converter, transferring to an RH (Ruhrstahl Heraeus) furnace, carrying out vacuum smelting, carrying out alloying treatment, and continuously casting the molten steel with chemical components meeting requirements into a plate blank; the plate blank is hot-rolled into a hot-rolled plate after being heated and subjected to heat preservation; and the hot-rolled plate is subjected to normalizing, acid pickling, cold rolling, continuous annealing and insulating coating coating to prepare a high-silicon phase-change-free electrical steel finished product. In the hot rolling process, the steel plate is transversely rolled through a vertical roller, the vertical roller reduction rate delta B of the vertical roller pass meets the condition that delta B is larger than or equal to 10 * delta h / H inlet and smaller than or equal to 18 * delta h / H inlet, delta h is the thickness difference of the plate blank before and after the pass, and H inlet is the thickness of the plate blank at the pass inlet. Through the process design of the procedures of continuous casting, heating, hot rolling, normalizing, cold rolling and the like, the structure uniformity of the material is improved, especially the structure uniformity in the thickness direction, and the one-time passing rate of cold rolling is 95% or above.

The invention belongs to the technical field of cobalt-based alloy machining, and particularly relates to high-strength cobalt-based alloy rolling machining equipment which comprises a rack and a cooling system, an upper roller and a lower roller are installed on the rack, one end of the rack is fixedly connected with a first motor, and the first motor is connected with the end of the lower roller through a reduction gearbox; and the other end of the lower roller is mounted on the bearing seat. The device further comprises a thickness acquisition module and a stress acquisition module. The thickness acquisition module and the stress acquisition module are used for monitoring the thickness and rolling pressure fluctuation of a rolled plate in real time, the control module is used for generating a corresponding fluctuation coefficient, and the thickness fluctuation coefficient and the stress fluctuation coefficient are comprehensively analyzed to generate an evaluation coefficient; and the roller spacing, the rolling speed and the working state of a cooling system are dynamically adjusted according to the evaluation result, so that the rolling process can adapt to material characteristics and working condition changes, the thickness uniformity of rolled plates is effectively improved, and the adverse effect caused by abnormal fluctuation of rolling pressure is reduced.

The invention relates to the field of steel rolling, and provides a steel rail bottom width adjusting method, system and device and a medium, and the method comprises the steps: obtaining historical data of steel rail production through VR simulation, and constructing an expert experience model based on the historical data; integrating an expert empirical model in the simulation platform, and simulating the working condition of steel rail adjustment; when the deviation of the bottom width exceeds a preset value and the upper leg tip thickness and the lower leg tip thickness are larger than the head thickness, a horizontal roller and a bottom vertical roller of the rolling mill are adjusted; when the deviation of the bottom width exceeds a preset value and the upper leg tip thickness and the lower leg tip thickness are smaller than the head thickness, a horizontal roller or a bottom vertical roller of the rolling mill is adjusted. Aiming at the deviation problem of the bottom width of the steel rail, high-precision control over the bottom width of the steel rail is achieved, the stability of the rolling process is ensured, and the control precision of the bottom width of the steel rail is remarkably improved; the timeliness of adjustment is improved, and the normalization of steel rolling adjustment is ensured; the problem of low calculation efficiency in manual adjustment is solved, and errors caused by human factors are avoided.

An electrically-assisted tooth-shaped rolling process and device for preparing a gradient ultrafine-grained sheet is provided. A rib-forming pressure roller, a rib-flatting pressure roller and a straightening pressure roller are adopted to sequentially roll relative to a surface of a sheet under a preset pressing force. The surface of the sheet is driven, under a rib forming process, to generate large deformation in micro-area to crush and refine grains, and under a rib flatting process to generate reverse large deformation in micro-area. Large deformation areas in the rib forming process and the rib flatting process are staggered to further crush and refine the grains. A cold straightening process drives the sheet to be restored to an original shape, so that the sheet becomes the gradient ultrafine-grained sheet with a decreasing grain size gradient from an interior to a surface layer.

The invention discloses a quick-response high-precision pre-stress rolling mill and a control method. The device at least comprises two frame type racks which are symmetrically arranged; a pre-stress cylinder is arranged on an upper beam of each frame type rack, and a driving shaft of each pre-stress cylinder downwards extends out of the upper beam and is positioned below the upper beam; upper bearing seat adjusting devices are mounted on the two sides of the prestress cylinder; an upper bearing seat is mounted between the upper bearing seat adjusting devices on the two sides; a driving shaft of the pre-stress cylinder is connected with the upper bearing seat and is used for providing pre-stress for the upper bearing seat; an adjusting hydraulic cylinder is arranged on a lower beam of each frame type rack, and a driving shaft of each adjusting hydraulic cylinder upwards extends out of the corresponding upper beam and is located above the corresponding lower beam; a lower bearing seat is arranged in the frame type rack below the upper bearing seat in a sliding manner; and a driving shaft of the adjusting hydraulic cylinder is connected with the lower bearing seat. The rolling precision is high, and the adjustment requirement of the rolling mill roll gap can be met through rapid and accurate adjustment of the lower bearing seat on line.

The application provides a strip thickness control method based on thickness measurement value delay compensation; comprising: step 1, establishing a strip thickness dynamic system; step 2, establishing a strip thickness measurement value considering the installation position offset of a thickness gauge; step 3, establishing a strip thickness inertia link prediction value; step 4, designing a mill roll gap setting value feed-forward quantity offsetting the effect of rolling pressure; step 5, designing a mill roll gap setting value feedback quantity of strip thickness deviation prediction value proportional feedback; step 6, designing a final mill roll gap setting value; and step 7, inputting the mill roll gap setting value into a mill hydraulic roll gap adjusting system for mill roll gap adjustment. The strip thickness inertia link prediction designed in the application not only makes up for the influence of strip thickness measurement value delay on thickness control, but also improves the thickness control response effect in the strip rolling transition process.

The invention discloses a roll bearing seat flexible connecting device, a quick-response high-precision pre-stress rolling mill and a control method. Comprising a frame type rack, and a roller bearing seat is arranged in the rack; a double-piston-rod hydraulic cylinder is arranged on an upper beam and / or a lower beam of the frame type rack; a connecting rod penetrates through a piston rod of the hydraulic cylinder; a concave-convex combined spherical pad sleeves one end, close to the bearing seat, of the connecting rod; the concave spherical pad is positioned on one side far away from the bearing seat, and the convex spherical pad is positioned on one side close to the bearing seat; the lower end of the connecting rod penetrates through the concave-convex combined spherical pad and the base to be connected to the roller bearing seat. The convex spherical pad can twist along with the bearing seat; the end, far away from the bearing seat, of the connecting rod extends upwards out of the rack and is in threaded connection with a nut, and the connecting rod between the nut and the rack is sleeved with a spring. According to the device, the combined spherical pad is arranged between the hydraulic cylinder and the bearing seat, so that the hydraulic cylinder and the bearing seat are flexibly connected, and the effect of protecting the hydraulic cylinder is achieved.

The invention provides a low-yield-ratio high-strength low-temperature steel plate for an LPG (liquefied petroleum gas) ship and a manufacturing method. The steel plate comprises the following components in percentage by weight: 0.060%-0.140% of C, 0.25%-0.60% of Si, 1.20%-1.60% of Mn, less than or equal to 0.007% of P, less than or equal to 0.004% of S, 0.050%-0.150% of V, 0.050%-0.100% of Nb, 0.0150%-0.0190% of N, 0.45%-0.80% of Cu, 0.65%-0.95% of Ni, 0.010%-0.030% of Ti, 0.025%-0.045% of Als, 0.080%-0.150% of Zr and the balance of Fe and inevitable impurities. The manufacturing method comprises the steps of smelting, continuous casting, reheating, casting blank cooling, rolling, online accelerated cooling and stacking slow cooling. According to the steel plate produced through the method, the yield strength is larger than or equal to 540 MPa, the tensile strength is larger than or equal to 685 MPa, the percentage elongation after fracture is larger than or equal to 24.0%, the yield ratio is smaller than or equal to 0.83, the impact absorption energy at the temperature of-80 DEG C is larger than or equal to 260 J, CTOD at the temperature of-40 DEG C is larger than or equal to 1.30 mm, and the yield ratio of the steel plate at the temperature of-40 DEG C is smaller than or equal to 0.80.

According to the production method of the hot-rolled copper-steel double-metal composite plate, copper is oxygen-free copper, and Cu is larger than or equal to 99.95%; the steel is low-alloy high-strength steel; the key process steps of the copper-steel composite plate comprise assembling, heating, rolling, cooling and finishing. By controlling the rolling temperature, the pass reduction rate, the cooling speed and other processes, the plate shape of the copper-steel rolled composite plate is obviously improved, the stability of the bonding surface is greatly improved, and therefore industrial production and application of the copper-steel bimetal rolled composite plate are achieved.

The invention relates to the technical field of steel smelting, in particular to high-strength and high-toughness fine-grain complex-phase structure wear-resistant steel and a preparation method thereof, the high-strength and high-toughness fine-grain complex-phase structure wear-resistant steel comprises the following components in percentage by weight: 0.12%-0.20% of C, 0.1%-0.4% of Si, 1.6%-2.0% of Mn, 0.045%-0.08% of Ti, 0.15%-0.3% of Cr, 0.05%-0.16% of Mo, 0.02%-0.05% of Al, less than or equal to 0.01% of P, less than or equal to 0.003% of S, less than or equal to 0.002% of N, less than or equal to 0.0002% of H, 0.002%-0.004% of B, more than or equal to 4.4 (30C + 0.5 Mn) * 100, more than The wear-resistant steel prepared by the invention has high strength, high hardness and good low-temperature toughness, and the impact absorbing energy at-40 DEG C is greater than or equal to 48J.

The invention discloses a cold rolling speed-rolling force-tension cooperative control system and method for a composite board, and the method comprises the steps: firstly, achieving the multi-step dynamic prediction of rolling key parameters through the time sequence feature extraction capability of a GRU network based on the cold rolling data of a multi-layer composite board, and achieving the feed-forward control through online optimization; a fuzzy PID self-adaptive compensation strategy is combined, so that the influence of external disturbance and parameter time variation is effectively inhibited; and the two methods are combined in a weighted fusion manner, so that the perspectiveness is ensured, the real-time disturbance influence is considered, and the cold rolling speed-rolling force-tension cooperative control of the composite plate is realized. According to the cold rolling speed-rolling force-tension cooperative control system and method for the composite board, the control effect is better, higher generalization ability and anti-interference performance are achieved, the control precision and stability of cold rolling of the multi-layer composite board are greatly improved, and the system and method can be widely applied to the cold rolling production process of the multi-layer composite board.

The invention relates to the technical field of equipment state monitoring, in particular to an equipment state monitoring and maintenance system, and provides the following scheme: acquiring three-dimensional stress energy density distribution data of a roller bearing seat, predicting a roller surface microcrack expansion trend, and generating a dynamic residual life index; rolling force compensation is carried out by combining the ellipticity data of the section of the pipe; meanwhile, by synchronously collecting Barkhausen noise signals and cooling medium flow data, the cooling intensity is adjusted in real time; in order to ensure the roller health, a roller health weight is generated based on the dynamic residual life index, a rolling force compensation model is constructed, rolling force distribution is optimized through a particle swarm optimization algorithm, and the uniformity of the wall thickness of the pipe is ensured; the method effectively prevents roller damage and pipe wall thickness mutation, improves the production efficiency and the product quality, and prolongs the service life of equipment.

The invention discloses V-N-B microalloyed 550MPa-grade steel for engineering machinery and a preparation method of the V-N-B microalloyed 550MPa-grade steel, and belongs to the technical field of low-carbon microalloyed steel production. The steel comprises the following components in percentage by weight: 0.06%-0.15% of C, 0.2%-0.35% of Si, 1.35%-1.65% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.01%-0.03% of Nb, 0.015%-0.0250% of Ti, 0.15%-0.25% of Cr, 0.015%-0.045% of Als, 0.05%-0.08% of V, 0.0012%-0.0020% of B, 0.01%-0.025% of N, 0.005%-0.010% of Ca 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 toughness and plate shape unevenness are solved.

The invention discloses corrosion-resistant and low-temperature-resistant carbon dioxide pipeline steel and a preparation method thereof. The preparation method comprises the following steps: preparing a continuous casting billet through smelting and continuous casting; the temperature of a soaking zone is TNbC + (40-100) DEG C, and the duration of the soaking zone is 30-50 min; the continuous casting billet is rolled into a steel plate with the thickness t larger than or equal to 38 mm through recrystallization zone rolling and two-phase zone rolling; the initial rolling temperature of recrystallization zone rolling is Tnr + (5-25) DEG C, the final rolling temperature is Tnr + (0-20) DEG C, and the plate thickness after rolling is 3.2-4.2 t; both the initial rolling temperature and the final rolling temperature of two-phase region rolling are Ar3-5 DEG C to Ar3 + 15 DEG C; after the steel plate leaves the rolling mill, the steel plate enters an ultra-fast cooling system for water cooling, the water entering temperature is larger than or equal to Ar < 3-30 > DEG C, the final cooling temperature is Bs-(340-300) DEG C, and the cooling rate is 9-22 DEG C / s; and the steel plate is air-cooled to room temperature through a cooling bed after being discharged.

The invention discloses a wide and thick steel plate for a 550MPa-grade corrosion-resistant anti-fatigue ocean tendon pipe and a production method of the wide and thick steel plate, the component design of the wide and thick steel plate enables CEIIW to be controlled to be 0.33-0.37% and CEPcm to be controlled to be 0.13-0.17%, the low-Nb and Mo-free design is adopted, the phase change temperature is increased, polygonal ferrite phase change is promoted, the tensile strength of the steel plate is improved, and the tensile strength of the steel plate is improved. The 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 combined to obtain a microstructure of granular bainite and polygonal ferrite, and the average deformation austenite height does not exceed 18 microns; the proportion, the size and the distribution of each phase are ideally controlled, and an important role is played for obtaining good comprehensive performance of the steel plate; the problem of matching of comprehensive technical characteristics such as high strength, high toughness, corrosion resistance, fatigue resistance and easy welding of the wide and thick steel plate for the ocean tendon pipe is solved.