238 results about "Laminar cooling" patented technology

The invention discloses a hot-rolled strip steel coiling temperature control method and related equipment, and relates to the technical field of hot-rolled strip steel, and the method comprises the following steps: determining a constant finish rolling speed of strip steel through a quadratic programming optimization algorithm based on a finish rolling outlet speed set value and a target finish rolling temperature of the strip steel; controlling the strip steel to pass through a laminar cooling area at a constant finish rolling speed and reach a target finish rolling temperature; the steel type specification, the constant finish rolling speed and the target finish rolling temperature of the strip steel are input into the heat flow density prediction model, and the heat flow density self-adaptive coefficient of the laminar cooling area is output through the heat flow density prediction model; based on the heat flow density self-adaptive coefficient and the target coiling temperature of the strip steel, the head preset header water quantity of the strip steel is determined; and in the process that the strip steel passes through the laminar cooling area, the head actual header water quantity of the strip steel is adjusted to the head preset header water quantity, so that the coiling temperature of the strip steel reaches the target coiling temperature.

The invention relates to the technical field of steel rolling, and discloses a Q355B steel hot rolling process optimization method based on dynamic temperature control, which comprises the following steps: blank pretreatment, dynamic heating control, high-pressure water descaling, rough rolling process, finish rolling process, laminar cooling and coiling process. According to the method, a collaborative system of multi-section variable-temperature heating and intelligent temperature control is constructed, temperature distribution in a furnace and the heating rate are monitored and dynamically adjusted in real time, it is guaranteed that the core surface temperature of a plate blank is uniform and consistent, thermal stress and the internal crack tendency in the heating process are eliminated, and a high-temperature blank uniform in structure and stable in performance is provided for follow-up rolling; meanwhile, the high-pressure water descaling system optimizes jet flow parameters and introduces chemical additives, so that a protective layer is formed while oxide scales on the surface are removed, the surface cleanliness and quality of the plate blank are improved, and product defects caused by incomplete descaling and surface damage are avoided.

The invention relates to the technical field of medium manganese steel, in particular to high-strength and high-toughness medium manganese steel and a preparation method thereof.The preparation method is characterized by comprising the steps that S1, smelting is conducted through an electric furnace according to the chemical component ratio of the medium manganese steel, then refining is conducted through a ladle refining furnace, then vacuum degassing treatment is conducted through a vacuum circulation degassing method, and then continuous casting is conducted to form a plate blank with the thickness being 200-300 mm; s2, the plate blank is heated to 1150-1250 DEG C in a walking beam furnace, heat preservation is conducted for 2-4 hours, and then a controlled rolling technology is adopted to machine the plate blank into a steel plate within the range of 4-20 mm; s3, after rolling is completed, the steel plate is treated through a composite cooling technology of ultra-fast cooling and laminar cooling; s4, the cooled steel plate is heated to 750-850 DEG C, heat preservation is conducted for 10-60 minutes, and a ferrite and austenite double-phase structure is formed; the comprehensive performance is greatly improved, and excellent strength, plasticity, low-temperature toughness and welding adaptability are shown.

The invention relates to a control method for preventing a medium carbon steel hot-rolled coil from being flattened. The control method comprises the following steps: 1) hot charging and hot delivery of a continuous casting billet; (2) putting a heat preservation cover and an edge heater into the middle roller way; (3) the laminar flow roller way and the coiling machine rotate at the set advance rate; 4) controlling the head temperature of the strip steel before coiling, and performing laminar cooling to shield the edge part; (5) after the coiling machine builds tension, constant tension needs to be formed between a coiling block and a finish rolling tail rack; (6) covering and coiling in a coiling machine after coiling; and (7) the steel coils are placed on the flat coil prevention steel coil frame after entering the coil warehouse, are stored in a single layer and are prevented from being placed at a ventilation position, and impact on the steel coils is avoided during hoisting. The technical process is optimized and improved, the measures that the temperature of a rolled piece is kept consistent as much as possible, it is guaranteed that a steel coil is not loosened after being coiled, the influence of expansion generated by phase change of the steel coil on interlayer gaps is reduced, and the shape of the steel coil is fixed to prevent the flat coil from being aggravated are taken, so that the flat coil rate is greatly reduced.

The invention discloses a method for improving preset control precision of a hot rolling laminar cooling model. The method comprises the following steps: acquiring historical strip steel data from a strip steel data buffer area; the target data of the historical strip steel data is compared with the target data of the current to-be-rolled strip steel, and if the similarity of the target data is higher than a first similarity threshold value, the next step is executed; the actually measured data of the historical strip steel data are compared with the target data, and if the absolute value of the difference value is within the preset difference value range, the next step is executed; the historical strip steel data are stored in the similar steel grade array, and when the strip steel block count value is smaller than the preset number, the first step is executed again; and averaging the historical strip steel data of the preset number of similar steel types as a preset parameter of the current to-be-rolled strip steel. The method can improve the coiling temperature hit rate of the head strip steel and improve the performance stability of the strip steel, so that the qualification rate of strip steel products is improved. The invention further discloses a system for improving the preset control precision of the hot rolling laminar cooling model.

The invention discloses an efficient and low-cost high-strength steel plate for a 1300MPa-grade low-temperature engineering structure and a manufacturing method of the high-strength steel plate, and belongs to the technical field of low-carbon microalloyed steel production. Optimized steelmaking, heating, rolling, pre-straightening, relaxation, controlled cooling, hot straightening and tempering processes are adopted, an ultra-fast cooling and laminar cooling mode is adopted for controlled cooling, chemical components of the steel plate contain Ce, and finally the problems that the 1300MPa-level hot-rolled steel plate with the thickness of 10-50 mm produced through an online cooling process is low in toughness, high in yield ratio, low in flaw detection qualification rate and uneven in plate shape are solved.

The invention relates to a manufacturing method of a duplex stainless steel and carbon steel asymmetrically rolled composite plate. Stainless steel is any one of duplex stainless steel. The medium carbon steel is any one of plain carbon steel, low-carbon steel and alloy steel. The manufacturing method of the asymmetric composite blank of the duplex stainless steel and the carbon steel comprises the following steps: 1, preparing raw materials for assembling the blank; 2, pretreating the stainless steel middle plate; and 3, surface treatment of the assembly raw material. And 4, cleaning. And 5, assembling. And 6, vacuum chamber electron beam seal welding. And 7, composite blank welding seam detection. And 8, heating the composite blank. And 9, rolling the composite plate. And 10, laminar cooling. And 11, the composite blank has no cracking phenomenon in the heating and rolling processes, the interface shear strength tau after hot rolling is larger than or equal to 280 MPa, the interface bonding rate is 100%, the bonding performance is good, and the proportion of dual-phase steel ferrite is 40-60%.

The invention discloses a hot-rolled weather-resistant steel plate for a road guardrail and a preparation method of the hot-rolled weather-resistant steel plate, and belongs to the technical field of weather-resistant steel. According to the hot-rolled weather-resistant steel plate for the road guardrail and the preparation method of the hot-rolled weather-resistant steel plate, by reasonably designing alloy components and matching with heating, rough rolling, finish rolling, laminar cooling and coiling processes, the contradiction between high strength and high plasticity is solved, industrial production of the hot-rolled weather-resistant steel plate for the road guardrail with the thickness of 2.5-4.0 mm is achieved, the yield strength of the hot-rolled weather-resistant steel plate is larger than or equal to 500 MPa, and the tensile strength of the hot-rolled weather-resistant steel plate is larger than or equal to 100 MPa. The tensile strength is larger than or equal to 600 MPa, the percentage elongation after fracture is larger than or equal to 30%, the 180-degree bending test D is equal to a, the corrosion resistance index I reaches 5.5-6.7, and the energy consumption of a single-section guardrail can be larger than or equal to 7.92 * 10 < 5 > J, so that lightweight application can be achieved, and the safety of the guardrail is guaranteed.

The application discloses a low-carbon-equivalent 355MPa grade normalized rolled thick plate organization uniformity control method, wherein the temperature of the billet before charging is less than or equal to 400 DEG C, the temperature of the soaking furnace is 1130-1150 DEG C, the time of the soaking section is 45-55 minutes, the total furnace time is 170-185 minutes, the second opening temperature of the billet is 880-940 DEG C, the finishing rolling is 6-8 passes, the cumulative reduction is 60-70%, and the final rolling temperature is 860-900 DEG C; the steel plate cooling is realized by adopting a laminar flow cooling system, the full-automatic water pouring control cooling mode is adopted, the water inlet temperature is 720-740 DEG C, the red temperature is 640-660 DEG C, and the surface temperature of the steel plate after cooling is monitored. The head and tail and the full-thickness organization type of the normalized rolled steel plate are all 'ferrite + pearlite' organizations, the grain size level is all above 9.0, there is no obvious banded structure and no bainite structure, and the problem of the organization difference of the 355MPa grade thick plate product caused by the normalized rolling is solved.

The invention belongs to the technical field of pipeline steel production, and discloses a hot continuous rolling production method of Mo and Ni-free X70M pipeline steel, which comprises the processes of slab heating, rough rolling, finish rolling, laminar cooling and coiling, and the pipeline steel comprises the following chemical components in percentage by mass: 0.060 to 0.090 percent of C, 0.10 to 0.25 percent of Si, 1.50 to 1.70 percent of Mn, 0.20 to 0.30 percent of Cr, 0.045 to 0.070 percent of Nb, 0.020 to 0.050 percent of Al, less than or equal to 0.005 percent of S, less than or equal to 0.012 percent of P, 0.020 to 0.030 percent of Ti, less than or equal to 0.0050 percent of N and the balance of Fe and inevitable impurities. According to the pipeline steel, Mo and Ni are not added, the alloy cost is extremely low, meanwhile, a hot rolled steel strip of the pipeline steel has good low-temperature tearing resistance and low yield ratio, and the safety in the pipeline service process can be guaranteed.

The invention discloses a process for improving a longitudinal shearing camber of QSTE650TM girder steel. The process comprises the steps of plate blank preparation, rolling and cooling, straightening treatment and longitudinal shearing machining. In the slab preparation step, the length of a slab is shortened to 8.5-9 m; in the rolling and cooling step, a plate blank is subjected to rough rolling and finish rolling firstly, and strip steel obtained after finish rolling is cooled; in the cooling process, air cooling is firstly carried out to 880-900 DEG C, then laminar cooling is carried out, the laminar cooling rate is 20-25 DEG C / s, and the final cooling temperature is 550-580 DEG C; the straightening treatment step comprises a rough straightening process and a fine straightening process; in the rough straightening process, the pressure of a rough straightening machine is 18-20 MPa; in the fine straightening process, the fine straightening insertion amount is controlled to be 30%-45% of the thickness of the strip steel, and the pressure of a fine straightening machine is 8-10 MPa; in the slitting processing step, the blade gap of a slitting machine is controlled to be 0.15-0.2 mm, and the winding tension is controlled to be 120-150N / mm. According to the method, the camber degree of the QSTE650TM girder steel after longitudinal shearing is systematically reduced, and the camber degree of the QSTE650TM girder steel is controlled within 3 mm.

The invention belongs to the technical field of stainless steel hot working, and discloses a martensitic stainless steel hot rolled steel coil manufacturing method capable of solving the edge crack problem in the wide rolling process so as to improve the yield. Comprising the steps that firstly, a continuous casting slab is heated for the first time in a heating furnace, the temperature of a heating section is 1100-1150 DEG C, the temperature of a soaking section is 1150-1200 DEG C, the heat preservation time of the soaking section is (1.00-1.25) t min, and t is the actually measured thickness mm of the slab before the slab enters the furnace; secondly, the heated continuous casting sheet billet is rolled into an intermediate billet through a roughing rolling unit, and the outlet temperature of the roughing rolling unit is 1000-1010 DEG C; 3, returning the intermediate billet to the heating furnace for secondary heating, wherein the heat preservation time of a soaking section of the secondary heating is shorter than that of the primary heating; fourthly, the intermediate billet heated for the second time is fed into a roughing rolling unit to be rolled, and the outlet temperature of the roughing rolling unit is 1000-1010 DEG C; 5, putting into a hot coil box after rolling; sixthly, the steel plate is fed into a finishing mill group to be rolled to the target thickness, and the finish rolling temperature is 1000-1050 DEG C; and 7, after finish rolling, laminar cooling is conducted to 300-400 DEG C, and then coiling is conducted.

The invention relates to a production method of high-grade non-oriented silicon steel hot-rolled strip steel, and belongs to the technical field of steel preparation. The method comprises the following steps: carrying out heating treatment on a non-oriented silicon steel continuous casting sheet billet containing specific alloy components, and controlling the tapping temperature of the heating treatment to be a set tapping temperature; carrying out rough rolling on the heated non-oriented silicon steel continuous casting sheet billet to obtain an intermediate billet; the intermediate billet is subjected to finish rolling, and hot-rolled strip steel is obtained; and the hot-rolled strip steel is subjected to laminar cooling, coiling, heat preservation and edge cutting, and the high-grade non-oriented silicon steel hot-rolled strip steel is obtained. Key process parameters of each hot rolling process are accurately controlled, and batch stable production of the high-grade non-oriented silicon steel with high silicon and high nickel alloy components is realized. According to the method, the edge qualification rate and the yield are increased, the harsh requirements of users for the material performance, the size and the strength are met, and key material support is provided for strategic emerging industries such as new energy automobiles and unmanned aerial vehicles.

The invention relates to an automotive frame steel plate with tensile strength of 750MPa and a hot rolling control method thereof, and belongs to the technical field of iron-based alloys. The steel plate comprises the following chemical components in percentage by mass: 0.05-0.08% of C, 0.1-0.3% of Si, 1.7-2.0% of Mn, less than or equal to 0.025% of P, less than or equal to 0.0030% of S, 0.05-0.1% of Ti, 0.04-0.08% of Nb, less than or equal to 0.0060% of N, 0.02-0.06% of Al, 0.3-0.7% of Mo, less than or equal to 0.0050% of Ca and the balance of iron and inevitable impurities. During hot rolling, the continuous casting sheet billet is controlled to be heated to 1250-1350 DEG C and then rolled, the rough rolling finish rolling temperature is 1050-1000 DEG C, the finish rolling finish rolling temperature is 880-900 DEG C, the reduction rate is larger than or equal to 60%, laminar cooling after rolling adopts front-section cooling, the cooling speed is 40-50 DEG C / s, and a hot rolled steel coil is obtained through coiling when the coiling temperature is 600-650 DEG C. Through proper chemical component design and hot rolling process condition control, the high-strength hot-rolled acid-washed automobile beam steel plate with the yield strength of 700-800 MPa and the tensile strength of 770-850 MPa is obtained.

The application provides a production method for improving the width direction performance stability of 800MPa grade complex phase steel and 800MPa grade complex phase steel produced by the method. In the production, the use of a width setting machine increases the edge deformation and promotes the grain structure of the edge to be more refined. The optimization of the water use strategy between the stands reduces the width direction temperature unevenness during the finishing rolling. The laminar flow cooling front section fast cooling technology is used to quickly cool the strip steel to the coiling target temperature, reduce the residence time of the strip steel in the water environment, and reduce the edge temperature drop during the period. The precise control laminar flow cooling edge shielding amount technology is used to make the edge of the strip product of different widths naturally flow through the cooling of the middle area cooling water, improve the edge temperature of the strip, and reduce the difference between the edge and the middle of the strip in the laminar flow cooling and the hot coiling cooling in the structure and performance. The product width direction tensile strength range is less than or equal to 35MPa, and the strength low point is greater than or equal to 815MPa.

The invention belongs to the technical field of hot continuous rolling production lines, and particularly relates to a strip steel laminar cooling device. Comprising a foundation frame, a header assembly, a turnover mechanism and a plurality of switching assemblies. The header assembly comprises an overturning cross beam and a plurality of upper headers arranged side by side, and the overturning cross beam is parallel to the foundation cross beam and used for supporting the upper headers; the turnover mechanism comprises a linear driver and a crank arm, one end of the crank arm is connected to the turnover cross beam, and the other end of the crank arm is rotationally connected to the basic cross beam; each switching assembly is connected between the water inlet end of the corresponding upper collecting pipe and the water supply pipeline, the rotating part of each switching assembly is used for rotating along with overturning of the corresponding upper collecting pipe, and each switching assembly is connected to the foundation cross beam in a floating mode. According to the header assembly, the independent turnover mechanism is arranged to bear the turnover load of the whole header assembly, so that the switching assembly only bears the functions of fluid communication and follow-up rotation, harmful radial force generated due to the fact that a plurality of switching assemblies are installed in a non-coaxial mode is eliminated, the reliability of the switching assembly is improved, and the service life of the switching assembly is prolonged.

The embodiment of the invention relates to the field of hot-rolled strip steel production, in particular to a hot-rolled strip steel production control method and device, equipment and a storage medium, and according to the method, a finish rolling device is controlled to carry out finish rolling treatment on heated strip steel and then output the strip steel. And the laminar cooling device is controlled to convey the strip steel output by the finish rolling device to the coiling device. After a conveying mechanism of the laminar cooling device bites steel, whether the preset condition is triggered or not is detected in real time. And under the condition that the preset condition is triggered, the transmission mechanism is controlled to carry out accelerated transmission. Under the condition that the preset condition is triggered, the conveying mechanism can be controlled to conduct accelerated conveying, waste steel caused by arching of the head of the thin strip steel passing through the finish rolling outlet output roller way due to immediate acceleration after steel biting is avoided, and then the production process is safe, stable and smooth.

The invention relates to a plate shape control method in the rolling process of steel 30MnB5 for hot stamping forming. The plate shape control method in the rolling process comprises the working procedures of plate blank heating, rolling, cooling and coiling. In the cooling process, laminar cooling is used for cooling the strip steel to the coiling temperature, the cooling process is set as follows: cooling is performed in a sparse cooling mode, the cooling speed of the front section of laminar cooling is controlled to be 20-30 DEG C / S, the cooling speed of the rear section of laminar cooling is controlled to be 30-40 DEG C / S, and the total water amount of laminar cooling water spraying is set according to the ratio of the water amount of the front section to the water amount of the rear section of 1: 1.2-1: 1.4. The method is easy to implement, and the good strip shape control quality of the steel strip can be obtained through reasonable process design. And additional equipment and investment are not needed. By means of the method, the strip shape of the 30 MnB5 steel strip of the hot stamping forming steel of 5-10 mm is well controlled, the unevenness of the strip steel is not larger than 10 mm / m after the strip steel is flattened, and the wave shape judgment reduction amount and strip shape objection complaints caused by the poor strip shape are completely eradicated.

The application relates to the technical field of hot-rolled high-carbon steel, in particular to a hot-rolled high-carbon steel and a preparation method thereof. The method comprises the following steps: heating a slab in a reducing atmosphere, and controlling the initial heating temperature of the slab; rolling the heated slab, and controlling the process parameters of the rolling to obtain a hot-rolled strip; wherein the rolling comprises rough rolling and finish rolling; adopting a sparse cold mode to perform laminar flow cooling on the hot-rolled strip, then performing coiling, and controlling the process parameters of the coiling to obtain a hot-rolled coil; performing heat preservation treatment on the hot-rolled coil, and controlling the time when the hot-rolled coil is discharged into the heat preservation treatment to obtain the hot-rolled high-carbon steel. The application solves the technical problem that the existing hot-rolled high-carbon steel is prone to cracks.

The application relates to the technical field of high-silicon steel materials, in particular to a high-silicon steel material with excellent pickling effect and a production method, which comprises the following steps: S1, continuous casting; S2, hot rolling; wherein the hot rolling comprises rough rolling and finish rolling, and after the finish rolling, laminar cooling is carried out, and the laminar cooling adopts front section cooling; S3, normalizing; S4, straightening; S5, pickling; S6, cold rolling; and S7, recrystallization annealing. On the basis of guaranteeing the high-temperature process of the hot rolling and normalizing procedures, the thickness of the iron oxide skin on the steel plate is controlled to be below 8 microns, the content proportion of the compact Fe3O4 in the iron oxide skin is below 70%, and the pickling effect of the steel plate after the normalizing is significantly improved.

The application discloses a 700MPa-grade CSP short-process hot-rolled high-weather-resistance container steel and a production method thereof. The chemical components of the steel include C: 0.02-0.06%, Si: 0.20-0.65%, Mn: 1.1-1.8%, P: 0.035-0.15%, S: ≤0.008%, Cu: 0.20-0.55%, Sb: 0.02-0.25%, Ti: 0.10-0.18%, N ≤0.005%, and the balance is balanced iron and inevitable impurities, wherein the carbon equivalent CEV is controlled to be ≤0.35%. The preparation mainly includes the converter smelting, the LF ladle furnace refining, the thin slab continuous casting and rolling, the laminar cooling and the coiling steps. The container steel obtained by the application has good mechanical properties, corrosion resistance, welding performance, forming performance and cost advantage, realizes the lightweight and long service life of the container, and is suitable for popularization and application.

The application discloses a 800MPa-grade magnetic pole steel for pumped storage hydroelectric generating set, which is characterized by the following components and wt%: C: 0.25-0.30%, Si: 0.10-0.20%, Mn: 1.1-1.5%, Cr: 0.2-0.3%, Ti: 0.1-0.2%, B: 0.0025-0.0030%, P: ≤0.015%, S: ≤0.010%, and Als: 0.02-0.10%. The production method comprises the following steps: pouring into a blank after conventional smelting; heating the cast blank; adopting 7-pass hot rolling to the product thickness; carrying out laminar cooling; coiling; annealing; and straightening. The application does not contain valuable alloy elements such as Nb and Mo, and the yield strength of the application is greater than or equal to 800MPa, the elongation A is greater than or equal to 12%, the magnetic induction performance B 50 ≥1.60T, which can fully meet the demand of the 800MPa-grade magnetic pole steel for the pumped storage hydroelectric generator rotor with a rated rotating speed of 600r / min, the product thickness of the application is not more than 2mm, and the cost can be reduced by 600-900 yuan / ton of steel compared with the prior art.

This application discloses a cooling method, apparatus, electronic equipment, readable storage medium, and hot-rolled steel strip production system for a laminar flow cooling roller conveyor, applicable to the field of metallurgical technology. The method includes acquiring temperature detection values ​​from hot metal detectors deployed at the inlet and outlet of the finishing mill. When the first and second temperature detection values ​​first meet the condition of no steel strip in the laminar flow cooling zone, a cooling water delivery command is sent to the laminar flow cooling water system according to a preset unit cooling time to cool the laminar flow cooling roller conveyor. When the first and second temperature detection values ​​again meet the condition of no steel strip in the laminar flow cooling zone, and the current time reaches a preset cooling interval, a cooling water delivery command is sent. This application overcomes the shortcomings of related technologies that cannot guarantee the cooling of the entire cooling roller conveyor, enabling precise control of the laminar flow cooling roller conveyor for cooling.

The utility model discloses a novel laminar flow cooling pressure stabilizing header device, which relates to the technical field of hot rolling laminar flow cooling headers and comprises a header main pipe, a flow stabilizing pipe and a filter screen, one end of the header main pipe is connected with a connecting hose through a connecting component, the other end of the connecting hose is connected with a connecting pipe, a pneumatic butterfly valve is mounted on the connecting pipe, and the filter screen is connected with the pneumatic butterfly valve. A plurality of upper spray pipes are connected to the header main pipe, a clamping ring is arranged at one end of the flow stabilizing pipe, a first clamping groove for clamping of the clamping ring is formed in one end of the header main pipe, a water outlet is formed in the flow stabilizing pipe, and the filter screen is clamped to one end of the header main pipe through a clamping assembly; through the arrangement of the flow stabilizing pipe, water sprayed by the plurality of spray pipes can be uniform, the quality of strip steel is ensured, the quality objection is reduced, production accidents caused by non-uniform cooling are reduced, and through the arrangement of the filter screen, the water can be filtered, and the blockage of the plurality of spray nozzles is reduced, so that the cooling efficiency is improved.

The invention provides an adjustable laminar cooling device and system.The adjustable laminar cooling device comprises a pipeline mechanism and an adjusting mechanism, the pipeline mechanism is provided with a water spraying part, and the adjusting mechanism comprises a sliding rail, a transverse adjusting assembly, a vertical adjusting assembly and three adjusting units arranged at intervals in the transverse direction; each adjusting unit comprises a mandrel, an adjusting plate, two connecting blocks and a plurality of adjusting sets, and each adjusting set comprises a joint and a supporting rod. In this way, the width coverage range of cooling water can be adjusted through the transverse adjusting assemblies, the vertical adjusting assemblies are matched with the adjusting plates and the adjusting sets to adjust the distance between the water spraying parts so as to adapt to plates of different thicknesses and specifications, and when the heights of the vertical adjusting assemblies at the two ends are different, non-equidistant linear control can be achieved between the water spraying parts; and the flow of each water spraying part can be independently controlled so as to adapt to plate blanks of special specifications, the whole equipment is high in plate adaptability, and gradient control over the cooling density can be achieved according to the thickness difference of strip steel.

The invention discloses a performance stability improving method based on titanium content and heating temperature cooperative control, and belongs to the technical field of hot continuous rolling steel production. The invention provides a performance stability improving method based on titanium content and heating temperature cooperative control in order to improve the performance stability of high-titanium-content titanium microalloyed steel. According to the method, different slab tapping temperatures and intermediate slab thicknesses are designed according to different Ti contents and finished product thicknesses, the rough / finish rolling temperature and the laminar cooling final cooling temperature are controlled at the same time, through cooperative control over components and the process, the influence of the high titanium content on steel performance fluctuation is avoided, mechanical property fluctuation of finished product steel is reduced, and the quality of the finished product steel is improved. And the fluctuation range of the yield strength and the tensile strength is within + / -30MPa.

The application discloses a preparation method of a 1.5mm hot-rolled 800MPa-grade weather-resistant photovoltaic support steel in the field of hot-rolling steel production, and the method comprises the following steps: adopting a steel grade component with 800MPa-grade weather resistance, controlling the thickness and length of the steel casting blank; adopting a hot feeding and hot charging mode for heating; rough rolling and finish rolling are carried out; laminar cooling is carried out on the steel strip after finish rolling; and finally, coiling is carried out. The application adopts a plate blank with a proper length, which is beneficial to reducing the temperature difference of the intermediate blank and the head and tail of the steel coil, the hot feeding and hot charging mode is adopted for heating, the core temperature of the plate blank can be improved, the rolling is stable, the rough rolling is carried out for four passes, the temperature drop at the entrance of the finish rolling is further reduced, and through reasonable control of the rolling speed, the plate crown, the loop amount, the bending force and the roll shifting amount and other processes in the finish rolling process, the 1.5mm thick hot-rolled steel plate has the advantages of good rolling stability, good weather resistance and excellent comprehensive performance, and the production efficiency and the yield of the extremely thin gauge hot-rolled high-strength weather-resistant steel plate can be improved.

The application discloses a method for quickly determining the difference of cooling speed of a steel plate, comprising the following steps: S1. hot-rolling a steel plate blank, wherein the thickness of the steel plate blank is greater than or equal to 12 mm, preferably greater than or equal to 15 mm; S2. cooling the hot-rolled steel plate blank, wherein the cooling comprises laminar flow cooling; S3. performing real-time flatness detection on the cooled steel plate blank to obtain a flatness detection result of the cooled steel plate blank, wherein the flatness detection result comprises the plate shape of the cooled steel plate blank; and S4. determining the difference of cooling speed of the upper surface and the lower surface of the steel plate blank according to the flatness detection result after cooling. The method of the application solves the problem that the prior art can only be judged after sampling and performing organization performance analysis, has real-time performance, can quickly determine the difference of cooling speed of the steel plate, and can be adjusted in time in the production process; a large number of steel plate blanks can be found and saved in time, the efficiency is improved, and waste is reduced.

The application provides a preparation method of a hot-rolled strip steel of Cr-Mo steel material, the Cr-Mo steel material contains Cr: 0.80-1.10wt%, Mo: 0.15-0.25wt%, the laminar cooling process adopts U-shaped cooling, after the strip steel head passes through the last rack in the multi-rack finishing rolling process, the pinch roll cooling water, the coiling roll cooling water and the mandrel cooling water are closed, after the coiling mandrel is built for a period of time, the pinch roll cooling water and the coiling roll cooling water are opened, the multi-rack finishing rolling process is ended, after the strip steel is tail thrown from the last rack for a period of time, the pinch roll cooling water and the coiling roll cooling water are closed, the mandrel cooling water is opened after the strip steel is discharged from the coiling machine, vertical transportation is adopted after the coiling is unloaded, the steel coil after rolling is placed for slow cooling in the warehouse area, so that the mechanical property uniformity of the steel coil can be obviously improved, the performance stability is improved, the thickness fluctuation of the cold rolling process is reduced, and the flatness quality of the product is improved.

The invention discloses a hot continuous rolling laminar cooling control method and system, and belongs to the technical field of hot rolling process control, the method comprises the following steps: collecting multi-source process parameters in a hot continuous rolling laminar cooling process, and constructing a multi-source data input vector; inputting the multi-source data input vector into a preset prediction model to obtain a valve opening number prediction value; on the basis of the process parameters of the preorder strip steel, the valve opening number correction value is calculated in real time through a preset feedforward model; and the predicted value of the valve opening number and the correction value of the valve opening number are superposed to obtain the final valve opening number, and the final valve opening number is conveyed to a control execution mechanism of the hot continuous rolling laminar cooling process. By the adoption of the hot continuous rolling laminar cooling control method and system, the control precision and robustness of the laminar cooling system under the complex and changeable working conditions can be effectively improved, and the method and system have remarkable industrial value for improving the structure property uniformity of strip steel products.