31834 results about "Steel plates" patented technology

The invention provides a color steel plate coating thickness dynamic monitoring method and system based on artificial intelligence. According to the method, the temperature distribution data of the surface of the color steel plate coating is obtained, the thermal response map is generated in a pulsed eddy current excitation mode, then the temperature distribution data and the thermal response map are subjected to time sequence correlation processing, the heat conduction characteristics are extracted, and then the heat conduction characteristics are synchronously analyzed; color steel plate coating defect types and thickness abnormal grades are distinguished through a dynamic weight distribution mechanism, a detection result containing defect positions, sizes and thickness deviation values is generated, and finally a coating thickness dynamic compensation instruction is generated according to the detection result; according to the technical scheme provided by the invention, the online control precision and the production efficiency of the coating quality are remarkably improved, and a closed-loop feedback system from detection to control is formed.

The invention provides a color steel plate coating flatness evaluation method and system based on artificial intelligence. According to the method, the three-dimensional point cloud data is generated by collecting the interference fringe image, and the surface fluctuation characteristics are quantified; capturing a multi-dimensional vibration spectrum of the transmission roller shaft, generating a servo motor compensation control signal, driving a multispectral scanning head to perform reverse displacement compensation, and generating real-time compensation data; inputting the surface topography features in the three-dimensional point cloud and the real-time compensation data into a lightweight convolutional neural network, and outputting fusion features; and dynamically classifying and identifying surface defects and uneven areas based on the fusion result, adjusting a classification threshold in combination with the speed of the production line, outputting a flatness evaluation result, and synchronizing the flatness evaluation result to a speed regulation system of the production line to realize closed-loop optimization. According to the method, laser interference, vibration compensation and lightweight AI technologies are fused, dynamic high-precision evaluation of the surface flatness of the color steel plate of the high-speed production line is achieved, and the problems of defect misjudgment and measurement distortion caused by vibration interference are solved.

The invention discloses a steel plate surface defect detection method based on improved YOLOv8, and belongs to the technical field of stainless steel plate defect identification, and the method comprises the following steps: S1, data collection and division: obtaining steel plate surface defect picture data, and dividing the data into a training set and a test set; s2, performing data enhancement and preprocessing to obtain a sample training set; s3, constructing a defect detection model based on the improved YOLOv8 network; s4, designing a loss function, and decoding a prediction result; and S5, repeatedly inputting the to-be-detected sample data in the sample training set into the defect detection model for training until the training frequency reaches a preset epoch, outputting a final defect detection model, then inputting the to-be-detected sample data in the test set into the final defect detection model, and obtaining a steel plate surface defect detection result. According to the invention, the detection precision and accuracy of the small target can be effectively improved, and the missing detection and false detection phenomena of small target defects are reduced.

Provided is a high-strength steel sheet having excellent member strength, ductility, stretch flangeability, bendability of a shear end surface, and low-temperature toughness. A high-strength steel sheet having a prescribed component composition and a steel structure in which the area ratio of martensite is 10%-80%, the area ratio of bainite is 2%-70%, the area ratio of ferrite is 80% or less, and the area ratio of retained austenite is 15% or less at a position at 1 / 4 of the sheet thickness. The ratio of the number of martensite blocks in which metastable carbides are present relative to the number of martensite blocks is 2% or more, and the standard deviation [sigma] n of the nano-hardness relative to the average value [Hn] ave of the nano-hardness is 0.60 x [Hn] ave or less when the nano-hardness at 225 points or more is measured at a position of 1 / 4 of the sheet thickness.

The invention discloses a cold-rolled sheet shape defect identification method based on multi-modal data, and the method comprises the steps: collecting sheet shape information of a cold-rolled steel sheet, the sheet shape information comprising sheet shape image information, process time sequence parameter information and motion time sequence parameter information of the cold-rolled steel sheet; the method comprises the following steps: constructing a cold-rolled sheet shape defect identification model, inputting sheet shape image information of a cold-rolled steel sheet into a lightweight CNN module of the cold-rolled sheet shape defect identification model to extract image features, and inputting process time sequence parameter information and motion time sequence parameter information of the cold-rolled steel sheet into a bidirectional LSTM module of the cold-rolled sheet shape defect identification model to extract time sequence features; and inputting the extracted image features and the extracted time sequence features into a space-time cross attention layer to extract fusion features, respectively inputting the extracted fusion features into a defect classification module and a defect proportion prediction module, and respectively predicting the defect type and the defect proportion of the cold-rolled steel sheet. According to the invention, high-precision and low-delay cold-rolled sheet shape defect identification can be realized.

The invention discloses a preparation method of preheating-welding-free extra-thick steel S355MLO for ocean engineering, and belongs to the technical field of metal materials. The steel comprises the following chemical components in percentage by mass: 0.04%-0.06% of C, 0.15%-0.50% of Si, 1.35%-1.45% of Mn, less than or equal to 0.008% of P, less than or equal to 0.003% of S, 0.012%-0.02% of Ti, less than or equal to 0.015% of Al, 0.15%-0.25% of Ni, less than or equal to 0.18% of Cu, less than or equal to 0.18% of Cr, less than or equal to 0.35% of Ceq = [C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15] and the balance of Fe and inevitable impurities. The low-carbon and high-manganese component design is adopted, the S355MLO super-thick steel plate with the maximum thickness of 100 mm is produced through a continuous casting billet, the carbon equivalent Ceq is smaller than or equal to 0.35, and high strength, high toughness and high welding performance are integrated. The base metal and welding toughness of the thick steel plate produced by the TMCP process are improved through the component and inclusion regulation and control technology, the process is simple, the production cost is low, the production efficiency is high, preheating before welding can be avoided, and energy conservation and consumption reduction are achieved.

Provided is a friction stir spot welded joint having high cross tensile strength even in the case where a steel sheet having a soft surface layer is used as a material to be welded. An annular groove is formed on an upper surface of an upper sheet out of overlapping steel sheets, and a shape and hardness of a welded portion are appropriately controlled simultaneously.

The purpose of the present invention is to provide: a high-strength steel sheet that has a tensile strength of 980 MPa or greater and that is excellent in ductility, fatigue strength, and blanking properties; and a method for manufacturing the same.　The high-strength steel sheet is characterized by: having a prescribed component composition; the main phase being a bainite phase composed of granular bainite and upper bainite having an area ratio of 85% or greater; the area ratio of a hard second phase that includes fresh martensite and / or a residual austenite phase being less than 15%; the area ratio of the granular bainite to the area ratio of the upper bainite in the bainite phase being 5% to 40%; the difference |Hv1 - Hv2| between the hardness Hv1 at the 1 / 2 position the sheet thickness and the hardness Hv2 at the 1 / 4 position of the sheet thickness being 30% or less in relation to 0.3 TS; and the average crystal grain size of the upper bainite phase being 7 μm or less.

The invention discloses a production method of 420-grade preheating-free welding maritime work steel, and belongs to the technical field of metal materials. The steel comprises the following chemical components in percentage by mass: 0.04%-0.06% of C, 0.15%-0.50% of Si, 1.45%-1.55% of Mn, less than or equal to 0.008% of P, less than or equal to 0.003% of S, 0.012%-0.02% of Ti, less than or equal to 0.010% of Al, 0.15%-0.25% of Ni, 0.10%-0.18% of Cu, 0.10%-0.18% of Cr, less than or equal to 0.38% of Ceq = [C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15], and the balance of Fe and inevitable impurities. A low-carbon and high-manganese component design is adopted, the S420MLO super-thick steel plate with the maximum thickness capable of reaching 100 mm is produced through a continuous casting billet, the carbon equivalent Ceq is smaller than or equal to 0.38, and high strength, high toughness and high welding performance are integrated. The base metal and welding toughness of the thick steel plate produced by the TMCP process are improved through the component and inclusion regulation and control technology, the process is simple, the production cost is low, the production efficiency is high, preheating before welding can be avoided, energy is saved, consumption is reduced, and the method is environmentally friendly.

The invention provides a cold-rolled strip steel plate shape closed-loop control method and system based on dynamic feedback, and belongs to the technical field of cold-rolled strip steel production.The method comprises the steps that a dynamic incidence matrix and a plate shape deviation signal are generated based on cold-rolled strip steel transverse measuring point data, processing the dynamic incidence matrix to obtain a space correlation defect feature vector of the cold-rolled strip steel, and processing the strip shape deviation signal to obtain a multi-dimensional defect feature vector; determining the strip shape defect type of the cold-rolled strip steel based on the multi-dimensional defect feature vector and the space correlation defect feature vector; and strip steel production control parameters are adjusted based on the strip shape defect type. The plate shape quality stability of the cold-rolled strip steel can be improved.

The invention relates to the technical field of building steel plate processing, in particular to a laser cutting method and a cutting production line structure for spliced building steel plates, which comprises the following steps of: S1, preliminary rapid detection, S2, uneven area length measurement, S3, three-dimensional data acquisition and S4, cutting link. S2, triggering execution of the step S2 according to a detection result of the step S1 and providing an initial scanning area, providing a precise scanning area for the step S3 according to the unsmooth area range determined in the step S2, and providing a parameter adjustment basis for the step S4 according to the three-dimensional form data obtained in the step S3 so as to realize precise control of the whole process from detection to cutting. The invention aims to solve the potential safety hazard problem that when spliced building steel plates are cut in the prior art, particularly under the condition that joints are uneven, the cutting precision is obviously reduced, and the strength and stability of a building structure are possibly reduced.

The invention relates to the technical field of defect detection, in particular to a steel plate surface defect detection method and system based on a multi-modal large model. Comprising the following steps: acquiring steel plate surface image data including a multi-scene standard image, a defect image, text description and a pixel-level position label; constructing a multi-modal defect positioning analysis model; extracting image feature vectors of the standard image and the defect image, generating defect position codes according to the image feature vectors, and performing feature fusion and up-sampling on the defect position codes through an image decoder to obtain pixel-level defect positions; extracting a defect graph feature vector and a range prompt word vector, performing vector splicing with the text description, inputting into the large language model, and outputting a defect analysis result; and optimizing the multi-modal defect positioning analysis model through the joint loss function. The problems that in the aspect of steel plate surface defect detection, defects can be accurately recognized, defect position information can be output, and a large amount of labeling box data with position information is not depended on are solved.

The invention discloses a steel plate welding quality monitoring and controlling method for ship machining, and relates to the technical field of welding control, the method comprises the following steps: monitoring and identifying a target steel plate welding seam through a monitoring and sensing module to obtain a welding seam characteristic sensing data stream, mapping processing analysis is conducted on the weld joint characteristic sensing data flow through a data processing multi-dimensional channel, weld joint defect characteristic parameter information is obtained, quality evaluation is conducted on the weld joint defect characteristic parameter information, a weld joint multi-dimensional evaluation quality result is obtained, control analysis is conducted on the weld joint multi-dimensional evaluation quality result through a steel plate welding strategy space, and a steel plate welding strategy space is obtained. And target welding control parameters are determined, welding control monitoring is carried out based on the target welding control parameters, steel plate welding feedback parameters are obtained, and quality optimization control is carried out on the target welding control parameters. The technical effects that intelligent and efficient monitoring of the welding quality is achieved through multiple nondestructive testing modes, the welding quality monitoring control accuracy and efficiency are improved, and then the ship steel plate manufacturing quality is ensured are achieved.

The GPa-grade ultrahigh-strength anti-fatigue steel comprises the following chemical components in percentage by weight: 0.02 to 0.07 percent of C, 0.10 to 0.25 percent of Si, 1.75 to 2.50 percent of Mn, 0.022 to 0.026 percent of P, less than or equal to 0.008 percent of S, 0.03 to 0.04 percent of Nb, 0.09 to 0.15 percent of V, 0.045 to 0.055 percent of Ti, 0.50 to 0.80 percent of Mo, 2.00 to 2.40 percent of Cr, 8.0 to 10.0 percent of Ni, 8.0 to 12.0 percent of Co, 0.035 to 0.045 percent of Als, 0.013 to 0.014 percent of N, 0.58 to 0.62 percent of Cu, 0.03 to 0.05 percent of Sb, 0.03 to 0.05 percent of RE and 0.0008 to 0.001 percent of B. The method comprises the steps of smelting, continuous casting, rapid cooling, casting blank heating, rolling and heat treatment. The maximum thickness of the steel plate is 100mm, Rp0.2 is 1080-1120MPa, A is greater than or equal to 18%, and the fatigue life gt under the peak stress of 560MPa; the impact energy at-60 DEG C is greater than or equal to 150J, and the marine atmosphere corrosion resisting rate is 1t; and 0.10 mm / a. The strength of the steel is improved, the impact toughness of the steel plate at low temperature is improved, and the corrosion resistance and the fatigue resistance of the steel are improved.

The invention discloses 460-grade preheating-free welding maritime work steel and a preparation method thereof, and belongs to the technical field of metal materials. The steel comprises the following chemical components in percentage by mass: 0.04 to 0.06 percent of C, 0.15 to 0.50 percent of Si, 1.75 to 1.85 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.003 percent of S, 0.012 to 0.02 percent of Ti, less than or equal to 0.015 percent of Al, 0.25 to 0.35 percent of Ni, 0.20 to 0.28 percent of Cu, 0.20 to 0.25 percent of Cr and the balance of Fe and inevitable impurities. A low-carbon and high-manganese component design is adopted, the S460MLO super-thick steel plate with the maximum thickness capable of reaching 100 mm is produced through a continuous casting billet, the carbon equivalent Ceq is smaller than or equal to 0.45, and high strength, high toughness and high welding performance are integrated. The base metal and welding toughness of the thick steel plate produced by the TMCP process are improved through the component and inclusion regulation and control technology, the process is simple, the production cost is low, the production efficiency is high, preheating before welding can be avoided, energy is saved, consumption is reduced, and the method is environmentally friendly.

The invention discloses thin-gauge non-oriented silicon steel and a production method thereof, and a motor iron core and a manufacturing method thereof. The production method comprises the following steps: heating a steel billet to 1080-1120 DEG C, preserving heat for 150-200 minutes, performing rough rolling to obtain an intermediate billet of 35-45 mm, performing finish rolling, and coiling to obtain a hot-rolled coiled plate of 2.30-3.00 mm; the initial rolling temperature of finish rolling is 970 + / -20 DEG C, the final rolling temperature is 850 + / -20 DEG C, the reduction rate is 92% or above, and the coiling temperature is 700 + / -20 DEG C; acid pickling and cold rolling are carried out under the condition that normalizing is not carried out, and cold-rolled strip steel with the thickness ranging from 0.15 mm to 0.35 mm is obtained; the total reduction rate of cold rolling is greater than or equal to 86%; performing primary annealing, cooling and coating to obtain a steel plate finished product; the annealing temperature is 830-870 DEG C, and the temperature is kept for 60-90 seconds. Therefore, the same piece of non-oriented silicon steel can meet the requirements of the stator and rotor iron cores at the same time, the manufacturing cost of the stator and rotor iron cores is low, and material waste is avoided.

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 cavity type mixed tower fan foundation formwork construction method. Comprising the steps of cushion layer pouring, pay-off, cavity foundation slab steel bar binding, annular support system erecting, foundation lower inner formwork supporting and inner support frame body arranging, cantilever anchoring end bottom formwork frame body supporting, cantilever anchoring end bottom formwork installing, foundation upper inner formwork supporting and inner support arranging, anchor backing plate and prestressed pipe installing, steel bar binding and annular support system erecting. And a foundation outer formwork is installed. Compared with the prior art, formwork erecting is formed at a time, a foundation is integrally poured, and the overall construction quality is guaranteed; the problem of leakage caused by two-time pouring of a construction joint part is avoided, water stop steel plates are reduced, and materials are saved; the inner supporting frame bodies are radially arranged with the center of the circle and the center of the stand column as a supporting point, and structural stress is reasonable. The supporting frame body is simple in structure, neat, attractive, reasonable in stress and easy to operate, the center stand column is recycled, and construction is efficient.

The invention discloses a transmission type steel plate shearing and slitting device, and belongs to the technical field of steel plate shearing machining, a plurality of groups of shearing tools penetrate through a steel plate, the steel plate can be sheared and slit by the plurality of groups of shearing tools in the rightward conveying process, the sheared and slit steel plate is fed onto a grinding assembly, and a friction wheel is in contact with the cut surface of the steel plate; the friction wheel can grind and remove burrs on the cut surface of the steel plate, air holes in the splitting hollow shaft can suck air, particle impurities generated by grinding fall into a collecting box on the bottom plate, generated dust is adsorbed by the air holes, gas containing the dust is filtered by a filter box through a connecting pipe, and the splitting hollow shaft can continuously rotate. The steel supporting and guiding device has the advantages that steel can be supported and guided, steel plate feeding continuity is kept, burrs generated on the cut surface of the steel plate can be effectively removed, quantitative removal is achieved, the steel and human bodies are prevented from being scratched when the steel plate is rolled or used, and product quality is guaranteed.

Provided is a steel sheet which is characterized by having a specific chemical composition, wherein: the metal structure contains, in terms of percentage by area, 90.0% or more of martensite and 3.0% or less of retained austenite; the average grain size of the prior austenite grains is 30.0 μm or less; the standard deviation of the grain size of the prior austenite grains is less than 4.0 μm; and the standard deviation of the dislocation density at seven positions corresponding to 5%, 10%, 15%, 20%, 25%, 30%, and 50% of the entire width of the steel sheet from an end in the width direction to the center in the width direction at a position corresponding to 1 / 4 the sheet thickness is 1.50 × 1015 / m2 or less. Also provided is a method for producing the steel sheet.

The invention relates to the technical field of roller type quenching machine cooling parameter optimization, and discloses a hybrid model-based roller type quenching machine billet cooling process parameter optimization method, which comprises the following steps of: performing parameter optimization on a flow set value and a roller way speed by adopting an improved particle swarm optimization algorithm to obtain a new flow set value of each section and an optimal roller way running speed; the new flow setting output by the improved PSO algorithm and the roller way speed serve as BP neural network input, and the water-cooling convective heat transfer coefficient is calculated; calculating boundary node temperature, solving an equation set through a TDMA numerical method, updating the position of a steel plate, calculating steel plate temperature distribution in the quenching process according to the position of the steel plate until the steel plate goes out of a quenching machine, constructing an optimized objective function of quenching cooling flow of the quenching machine, introducing a penalty function to perform constraint processing until iteration is terminated, and finally obtaining the quenching cooling flow of the quenching machine. And finally obtaining the set values of the regional flow and the roller speed corresponding to the minimum target function value of the steel plate, and outputting the corresponding temperature distribution of the steel plate.

The invention relates to a method for improving the same-circle mechanical property uniformity of a low-carbon cold heading steel wire rod, which comprises the following steps of: firstly, carrying out sectional heating on a steel billet at the temperature of a preheating section of 715-785 DEG C, the heating temperature of a first section of 810-850 DEG C, the heating temperature of a second section of 920-960 DEG C and the temperature of a soaking section of 1000-1040 DEG C; then the prepared steel billet is rolled into a wire rod, the initial rolling temperature ranges from 910 DEG C to 950 DEG C, the finish rolling inlet temperature ranges from 865 DEG C to 885 DEG C, the finish rolling outlet temperature is smaller than or equal to 1020 DEG C, and the finish rolling temperature ranges from 890 DEG C to 910 DEG C; the prepared wire is subjected to water cooling to 840-860 DEG C for spinning, and then the wire is rolled into a wire rod at 780-850 DEG C; and finally, the prepared wire rod is placed on a stelmor slow cooling line for heat preservation and slow cooling, the stelmor slow cooling speed is 0.2-1 DEG C / s, the temperature of entering a heat preservation vestibule is 740-770 DEG C, the heat preservation time of the heat preservation vestibule is 75-150 min, and the temperature of leaving the heat preservation vestibule is smaller than or equal to 400 DEG C. By means of the method, the same-circle mechanical property tensile strength fluctuation of the steel wire rod is smaller than or equal to 10 Mpa, the percentage reduction of area fluctuation is smaller than or equal to 2%, the percentage elongation after fracture fluctuation is smaller than or equal to 2%, the yield strength fluctuation is smaller than or equal to 8 Mpa, metallographic structures are evenly distributed, and no abnormal structure exists.

The invention belongs to the field of metal materials, and particularly relates to a high-strength hot-rolled pickled steel plate for an automobile chassis and a production method thereof. The steel plate is mainly suitable for manufacturing automobile chassis structural parts. The steel comprises the following chemical components: C, Si, Mn, Al, V, Ni, Cu, Cr, Pt and Y, P is limited to be less than or equal to 0.015%, S is limited to be less than or equal to 0.005%, N is limited to be less than or equal to 0.006%, and the balance is Fe and inevitable impurities. The yield strength of the steel plate ranges from 498 MPa to 552 MPa, the tensile strength ranges from 608 MPa to 643 MPa, the transverse elongation A ranges from 33% to 38%, the steel plate is qualified after transverse cold bending by 180 degrees D = a, the surface quality is good, oxide scale stripes and chromatic aberration defects are avoided, the surface roughness Ra ranges from 1.10 micrometers to 1.35 micrometers, and the steel plate has excellent corrosion resistance.

The present invention relates to a steel sheet and a plated steel sheet, each of which has high LME resistance. The steel sheet according to the present invention is characterized in that: the steel sheet has a tensile strength of 780 MPa or more; the steel sheet has a specific chemical component; the depth, at which the C concentration as measured by GDS is 0.05% or less, from the surface of the steel sheet in the thickness direction of the steel sheet is 8 μm or more; the thickness of a layer, in which the area ratio of the ferrite phase is 90% or more, in the thickness direction of the steel sheet from the surface of the steel sheet is 8 μm or more; and the solid solution amount of Si metal and Al metal in the ferrite phase is 0.3% or more in total at the position of 4 μm from the surface of the steel sheet in the thickness direction of the steel sheet.

The invention discloses a color-coated steel plate weather resistance evaluation method based on multi-source data fusion, and relates to the technical field of color-coated steel plate weather resistance evaluation. The method comprises the following steps: acquiring color-coated steel plate data based on Internet of Things sensing equipment and preprocessing the color-coated steel plate data; in an experimental environment, performing subitem weather resistance evaluation based on the preprocessed data of the color-coated steel plate, and determining a weather resistance evaluation grade of each subitem; if the weather resistance evaluation grades of all the sub-items are qualified, comprehensive weather resistance evaluation is conducted on the color-coated steel plate based on different simulated use environments, the risk grade of the color-coated steel plate in the simulated use environment after the weather resistance evaluation of the sub-items is determined, and multi-dimensional data are obtained through Internet of Things sensing equipment and fused and analyzed; practical accurate evaluation and comprehensive risk judgment of the appearance, the corrosion resistance and the mechanical property of the coating are achieved, and the problems that in an existing evaluation method, due to a single data source, the evaluation result is one-sided, and the weather resistance of the color-coated steel plate in the complex environment cannot be comprehensively reflected are solved.

The invention discloses steel for extremely cold marine environment engineering and a production method of the steel. The steel comprises the following chemical components: 0.02 to 0.07 percent of C, 0.10 to 0.25 percent of Si, 1.75 to 2.50 percent of Mn, 0.022 to 0.026 percent of P, less than or equal to 0.008 percent of S, 0.025 to 0.030 percent of Nb, 0.02 to 0.03 percent of V, 0.02 to 0.03 percent of Ti, 0.15 to 0.35 percent of Cr, 0.15 to 0.35 percent of Ni, 0.02 to 0.05 percent of Co, 0.035 to 0.045 percent of Als, 0.010 to 0.012 percent of N, 0.15 to 0.22 percent of Cu, 0.03 to 0.05 percent of Sn, 0.03 to 0.05 percent of Sb and 0.03 to 0.05 percent of RE. Through smelting, slab continuous casting, casting blank heating, rolling and cooling, the Rp0.2 of the steel is 420-480 MPa, A is larger than or equal to 26%, the impact energy at the temperature of-80 DEG C is larger than or equal to 210 J, the corrosion resistance rate is smaller than 0.080 mm / a, the fatigue life under the peak stress load of 200 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 45%. The steel plate provided by the invention has relatively high strength and excellent low-temperature toughness, and also has relatively good corrosion resistance and fatigue resistance.

The invention belongs to the technical field of plate shape monitoring and visual analysis, and discloses a stainless steel medium-thickness plate double-face contour measurement method and system, and the method comprises the steps: S1, completing the calibration of a double-line-scan digital camera, and obtaining the upper and lower surface images of a medium-thickness plate; s2, carrying out binocular stereoscopic vision three-dimensional reconstruction to generate a point cloud picture, and converting the point cloud picture into a point cloud picture under the same coordinate system for display; s3, eliminating transverse rotation and deviation according to point cloud center line fitting and plane fitting of the upper surface and the lower surface of the medium-thickness plate; s4, comparing the geometrical relationship between the point clouds of the upper and lower surfaces to quantify local vibration and thickness change, correcting vibration errors, and obtaining the thickness of the medium-thickness plate; and S5, extracting an edge point set from the point cloud image to obtain the overall contour of the medium-thickness plate, and obtaining the position of a shear line based on the width and edge linearity detection of the medium-thickness plate. By the adoption of the technical scheme, the overall contour, overall thickness distribution and accurate shearing position of the medium-thickness plate can be obtained.

The invention discloses a hot-rolled high-weather-resistance steel plate with extremely low yield ratio and 850 MPa-grade tensile strength as well as a manufacturing method and application of the hot-rolled high-weather-resistance steel plate. The steel plate comprises chemical components in percentage by weight as follows: 0.06%-0.08% of C, 0.40%-0.60% of Si, 0.40%-0.60% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, 2.50%-3.00% of Cr, 0.25%-0.30% of Cu, 0.13%-0.15% of Ti, 0.020%-0.040% of Alt, smaller than or equal to 0.0040% of N, smaller than or equal to 0.0030% of O and the balance of Fe and inevitable impurities. The high Cr + high Ti design is adopted, the tensile strength reaches 850 MPa, the weather resistance index I value is larger than or equal to 8.0, addition of precious metal Ni is omitted, the addition amount of the strong hardenability element Cr in the steel exceeds 2.50%, a fine grain ferrite and bainite double-phase structure is obtained in combination with the controlled rolling and controlled cooling process, meanwhile, the precipitation strengthening and fine grain strengthening effects of Ti are fully exerted, control over high strength and the extremely-low yield ratio smaller than 0.65 is achieved, and the high-strength and low-yield-ratio steel is obtained. The forming performance is excellent, the corrosion rate is smaller than 40% relative to Q345B, and good atmospheric corrosion resistance is achieved.

The invention discloses a scaffold steel plate net building method based on BIM, and relates to BIM modeling. The method comprises the steps that feature parameters of a scaffold steel plate net are obtained; according to the characteristic parameters, establishing a three-dimensional entity model of the scaffold steel screen by using a parametric modeling method; performing grid division on the three-dimensional solid model by adopting a self-adaptive grid division algorithm to obtain a finite element grid; identifying a stress concentration area in the finite element grid by adopting a self-adaptive grid encryption algorithm, and performing grid encryption on the stress concentration area to obtain an encrypted finite element grid; performing structure optimization on the encrypted finite element mesh by adopting a topological optimization algorithm to obtain an optimized three-dimensional entity model of the scaffold steel plate mesh; and performing component arrangement optimization on the three-dimensional entity model after structure optimization by adopting a discrete topological optimization algorithm to obtain a final scaffold steel plate net BIM model. In order to solve the problem that in the prior art, scaffold steel plate net erecting redundancy is large, the redundancy design is reduced.

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.