815 results about "Continuous annealing" patented technology

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

The invention belongs to the field of metal materials, and particularly relates to high-elongation and high-forming passenger car steel and a production method thereof.The steel plate is mainly suitable for manufacturing passenger car structural parts, the steel comprises the following chemical components of C, Si, Mn, Al, V, Ta, Bi, Sb, Ni, Pt and Y, P is limited to be smaller than or equal to 0.015%, S is limited to be smaller than or equal to 0.005%, N is limited to be smaller than or equal to 0.006%, and the balance Fe and inevitable impurities. The steel plate is obtained by adopting hot rolling, EPS, continuous annealing and finishing processes, the processes of pickling and cold rolling are reduced, the production process is simplified, the production cost is reduced, and the environment is not polluted.

The invention belongs to the field of metal materials, and particularly relates to high-formability steel for a passenger car and a production method of the high-formability steel, the steel plate is mainly suitable for manufacturing passenger car structural parts, the steel comprises the following chemical components: C, Si, Mn, Al, Ti, Ta, Bi, Sb, Ni, 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 0.003%, and the balance is Fe and inevitable impurities. The steel plate is obtained by adopting hot rolling, EPS, continuous annealing and finishing processes, the processes of acid pickling and cold rolling are reduced, the production process is simplified, and the environment is not polluted.

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

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

The invention discloses a strip continuous annealing system for an anti-adhesive tape in the technical field of annealing systems. The strip continuous annealing system comprises an annealing barrel, and a heating barrel is fixedly mounted in a heat preservation barrel; in the continuous annealing process of the strip of the anti-sticking strip, the strip is supported by the supporting columns and the supporting rods, and the strip moves upwards spirally under the action of the guide rails and the limiting groove plates, so that the occupied space of equipment during annealing can be reduced, the space utilization rate is increased, more strips can be annealed at the same time, and the production efficiency is improved. The working efficiency is improved, a first cam and a second cam act on a supporting rod to alternately move up and down, the supporting rod can alternately support the strip in the strip annealing process, on one hand, the contact area between the supporting rod and the strip is reduced, and the strip is prevented from being adhered to the supporting rod in the strip annealing process; on the other hand, the contact time of a single supporting rod and the strip is shortened, and the influence of the supporting rod on heating of the strip contact position is reduced.

The invention relates to a low-cost cold-rolled low-alloy high-strength steel production method which comprises the following process steps: S1, hot coiling: adopting the process flows of molten iron pretreatment, 150t top-bottom combined blown converter, LF furnace and continuous casting to produce a qualified plate blank; s2, acid rolling is conducted, oxide scales on the hot-rolled surface are removed through a reasonable acid pickling technology, sufficient deformation distortion energy during annealing is provided through a proper acid rolling reduction rate, and power is provided for sufficient recrystallization; s3, continuous annealing and galvanization: strictly checking the surface reflectivity before annealing and annealing, ensuring the surface cleanliness, ensuring the surface quality of a final product, heating the cold hard coil to be above the recrystallization temperature through a continuous annealing furnace, ensuring the mechanical property of the final product, completing the annealing and cooling processes through the continuous annealing furnace for continuous annealing and galvanization, and performing continuous annealing and galvanization through an oiling machine. And uniformly coating the surface of the steel plate with anti-rust oil, and generating a final finished product through a coiling machine. The comprehensive tensile property and the surface quality of the cold-rolled low-alloy high-strength steel are guaranteed.

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

The invention belongs to the field of metal materials, and particularly relates to high-strength passenger car steel and a production method thereof.The steel plate is mainly suitable for manufacturing passenger car structural parts, the steel comprises the chemical components of C, Si, Mn, Al, Nb, V, Ta, Bi, Sb, Ni, Cr, Pt and Y, P is limited to be smaller than or equal to 0.015%, S is limited to be smaller than or equal to 0.005%, N is limited to be smaller than or equal to 0.006%, and the balance Fe and inevitable impurities. The steel plate is obtained by adopting hot rolling, EPS, continuous annealing and finishing processes, the processes of pickling and cold rolling are reduced, the production process is simplified, the production cost is reduced, and the environment is not polluted.

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

The invention discloses a continuous annealing process for TA4 cold-rolled titanium strip coils, which comprises the following steps: S1, surface degreasing: degreasing TA4 cold hard coils to remove oil stains on the surfaces; s2, continuous annealing of the material coil: introducing protective gas into a continuous annealing furnace, continuously heating to 520-650 DEG C, feeding the TA4 titanium strip coil into the furnace, carrying out continuous annealing, and carrying out titanium strip coil running by a rolling machine at a set running speed and tension; and S3, the material strip is cooled, specifically, the titanium strip is cooled in the cooling section of the continuous furnace, and a titanium strip coil is wound through a winding machine. The TA4 titanium strip coil manufactured through the technological process of surface degreasing, continuous annealing and cooling is stable in tensile strength, yield strength and ductility and meets the use standard.

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 relates to duplex stainless steel, in particular to high-nitrogen duplex stainless steel and a preparation method of a strip of the high-nitrogen duplex stainless steel. The duplex stainless steel comprises the following chemical components in percentage by mass: 0.15 to 0.35 percent of N, 24.5 to 26.5 percent of Cr, 8.0 to 11.0 percent of Ni, 3.4 to 3.9 percent of Mo, 1.5 to 3.5 percent of Mn, less than or equal to 0.001 percent of C, less than or equal to 0.20 percent of S i, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S and the balance of Fe. The preparation method comprises the steps of smelting, coping, segmented heating forging, coping hot rolling, solution treatment, third-time cold rolling, degreasing and continuous annealing. According to the invention, the N content is increased to 0.15-0.35%, so that the corrosion resistance of the duplex stainless steel is improved, and the plasticity, weldability and toughness of the nitrogen-containing stainless steel are improved; and meanwhile, in the forging and hot rolling processes, the modes of preheating and then rapid temperature rising and heating and rapid temperature rising and heating are adopted, and the temperature is controlled, so that the retention time of a brittle phase at the temperature of 600-1000 DEG C in the forging and hot rolling processes is shortened, the brittle phase precipitation amount on the surface of the intermediate billet is reduced, and the problem of cracking in the forging and hot rolling processes is further avoided.

The invention relates to a normalizing-free method for producing non-oriented electrical steel. The method comprises the following steps: 1) performing multi-pass finish rolling, cooling and coiling on an intermediate billet to obtain a hot-rolled coil plate with the thickness of 2.30-2.60 mm; (2) the hot-rolled coil plate is not subjected to normalizing treatment, but is sequentially subjected to uncoiling, acid pickling, rinsing, drying, cold rolling and coiling, and a cold hard coil with the thickness being 0.35-0.65 mm is obtained; (3) the cold hard coil is subjected to finished product annealing in the mixed atmosphere of H2 and N2 through a continuous annealing furnace, the finished product annealing temperature ranges from 850 DEG C to 1000 DEG C, and the annealing time ranges from 50 s to 70 s; and cooling, coating and finishing the annealed steel strip to obtain a non-oriented electrical steel finished product. The method has the advantages that under the condition that normalizing intermediate annealing is not adopted, the burden of production procedures such as steelmaking and hot rolling can be relieved, the control difficulty of harmful elements and inclusions in the steelmaking link is lowered, and the control difficulty of recrystallization microscopic structures in the hot rolling link is lowered.

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 relates to the technical field of metallurgy, in particular to a zinc-aluminum-magnesium coating preparation method capable of keeping coating integrity in a corrosion environment, alloy steel with the thickness of 1.8 mm or above is adopted, in the preparation process, a continuous annealing process adopts a three-section heating process, and an after-plating cooling process adopts a three-section variable-temperature cooling process; a plating solution adopted by the zinc-aluminum-magnesium plating layer comprises the following chemical components in percentage by weight: 9-11% of Al, 2.8-3.1% of Mg, less than or equal to 0.1% of rare earth elements, 0.1-0.2% of Si and the balance of Zn and inevitable impurities; according to the invention, the key problems of poor coating structure uniformity, contradiction between scratch resistance and self-repairing capability, limitation of super-thick coating preparation process, insufficient adaptability to extreme corrosion environment and the like of the existing zinc-aluminum-magnesium coating technology in industrial application are solved, and the coating can efficiently keep structural integrity in the industrial corrosion environment, and can be widely applied to the industrial corrosion environment. And meanwhile, the requirements of super-thick coating preparation, complex working condition adaptability and low-cost industrial production are met.

The invention relates to the technical field of titanium material manufacturing, in particular to a tensile titanium alloy wire machining process which comprises the steps that aluminum, vanadium, iron, carbon, nitrogen, hydrogen, oxygen and titanium are put into a vacuum consumable electric arc furnace in proportion to be smelted, and a titanium alloy cast ingot is obtained; the titanium alloy cast ingot obtained after chemical cleaning is heated and forged; the forged blank is rolled and drawn, and the drawn wire is subjected to annealing treatment; collecting the temperature of each position of each temperature area in the continuous annealing furnace at each moment, and determining the thermal diffusion fluctuation of each position in the continuous annealing furnace in each time period; calculating the heat flow coefficient of each position in the continuous annealing furnace in each time period; acquiring proportional parameters of a PID controller in each position and each time period in the continuous annealing furnace, and controlling the temperature of each position by using the PID controller; and the titanium alloy wire is obtained after annealing treatment. The tensile property of the titanium alloy wire is improved.

The invention provides a production method of a cold-rolled titanium steel composite plate coil. Industrial production is achieved through the following steps that S1, the titanium steel composite plate coil is selected as a cold-rolled raw material; s2, removing the titanium layer at the head and the tail of the raw material to expose the steel base material, and welding the steel base material with the stainless steel leading tape; s3, a continuous annealing furnace is adopted for annealing the composite plate coil welded in the step S2, shot blasting is carried out after annealing, and acid pickling is carried out after shot blasting; a reversible reciprocating rolling mill is adopted for rolling, a constant rolling force mode is adopted for cold rolling, the accumulative deformation is controlled to be 50%-75%, and the single pass is smaller than or equal to 15%; s5, degreasing the cold-rolled composite plate coil; s6, carrying out multi-step vacuum annealing on the degreased composite plate coil; s7, flattening the composite plate roll subjected to vacuum annealing; and S8, the flattened composite plate coil is pulled and straightened, and the cold-rolled titanium steel composite plate coil is prepared. According to the method, the continuous production of the cold-rolled titanium steel composite plate coil with good performance can be realized by adopting a conventional production line without first-pass heavy reduction or a special powerful rolling mill.

The invention belongs to the technical field of aluminum-based materials, and particularly relates to a preparation method of a high-performance 1060-O-state aluminum alloy connecting piece. The preparation method comprises the following steps that firstly, a hot-rolled coil is prepared; step 2, preheating treatment; thirdly, a cold-rolled coil is prepared; fourthly, air cushion type continuous annealing is conducted; 5, annealing a finished product in the box-type furnace; and step 6, slitting a finished product. According to the method, the problems of low production efficiency, poor comprehensive performance and high energy consumption when the O-state aluminum alloy connecting piece is prepared by adopting a single box-type furnace annealing process are solved, high-efficiency, high-consistency and low-energy-consumption production is realized, and the prepared connecting piece has stable low strength and high ductility and is suitable for large-scale production. And the application requirements of new energy automobiles and energy storage battery modules can be met.

The invention belongs to the field of metal materials, and particularly relates to 1430MPa-grade steel for passenger cars and a production method of the 1430MPa-grade steel, and the steel plate is mainly suitable for manufacturing passenger car structural parts. The steel comprises the following chemical components: C, Si, Mn, Al, Nb, V, Ta, Bi, Sb, W, Cr, Pt, Zr and Y, Al / Si is 1.0-2.0%, Ta + Zr is 0.040-0.048%, 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 steel plate is obtained through the hot rolling, EPS, continuous annealing and finishing processes, the pickling and cold rolling processes are omitted, the technological process is simplified, and the environment is not polluted.

The invention discloses a nonlinear model predictive control method for the strip steel temperature of a continuous annealing furnace, and relates to the technical field of metallurgical industry automation control, and the method comprises the following steps: collecting historical data in the production process of the continuous annealing furnace; a nonlinear autoregression exogenous input model based on Sigmoid-ARX is established; the model parameters are optimized through a Levenberg-Marquardt algorithm, and the model parameters are optimized through the Levenberg-Marquardt algorithm; based on the optimized Sigmoid-ARX model, designing a nonlinear model prediction controller, performing local linearization near a given working point, and converting a nonlinear optimization problem into a quadratic programming problem; by constructing the Sigmoid-ARX nonlinear model and the predictive control capability and system-level constraint processing characteristics of the model predictive control algorithm, the strip steel temperature predictive precision is improved, stable control over strip steel of different specifications in the transition stage is achieved by optimizing the control strategy, the standard deviation of the strip steel temperature and speed is reduced, and the stability of the strip steel temperature and speed is improved. The average speed of a production line is improved, and the yield is increased.

The invention discloses a production process of high-strength anti-distortion cold-rolled strip steel. The production process comprises the links of raw material preparation, cold rolling, heat treatment, surface treatment and quality detection. Selecting medium-carbon steel with specific components as raw materials, and controlling the tolerance of hot-rolled strip steel; a six-roller unit is adopted for multi-pass rolling in cold rolling, and a plate shape control technology is matched; continuous annealing and gradient quenching-isothermal tempering are applied to heat treatment, so that a specific structure gradient is formed, and the distortion rate is reduced; the surface is subjected to acid pickling, hot galvanizing and a nano ceramic composite coating, so that the corrosion resistance and the wear resistance are improved; and the quality is guaranteed through online detection and sampling inspection. The strip steel produced through the technology is high in strength, good in toughness, high in corrosion resistance and suitable for the high-requirement field.

The invention relates to a furnace temperature optimization method in a belt changing process of a horizontal continuous annealing furnace. The method comprises the following steps: S1, constructing a dynamic response model of the annealing furnace; s2, before strip changing of the horizontal continuous annealing furnace, according to a preset strip changing plan and the current furnace condition, the annealing furnace dynamic response model is used for calculating the strip steel temperature and the set furnace temperature of each heating area in real time, and an optimal furnace temperature adjusting curve is generated; a temperature detection unit in the horizontal continuous annealing furnace is used for monitoring material temperature and furnace temperature changes in real time, the deviation between a set value and an actual value is calculated, and the furnace temperature set value of the horizontal continuous annealing furnace is dynamically adjusted according to the deviation value; s3, the control system adjusts the output power of a heating element in the horizontal continuous annealing furnace according to the optimal furnace temperature adjustment curve, so that the furnace temperature is executed according to the preset strip changing temperature; and S4, after belt replacement of the horizontal continuous annealing furnace is completed, the output power of a heating element in the horizontal continuous annealing furnace is adjusted, and the furnace temperature is restored to the temperature range of normal production. The method can improve the product quality and the production efficiency.

The invention belongs to the field of metal materials, and provides 800MPa-grade alloyed galvanized complex phase steel with ultrahigh reaming performance for automobiles and a preparation method of the 800MPa-grade alloyed galvanized complex phase steel, and the steel plate comprises the following components in percentage by weight: 0.12%-0.17% of C, 1.90%-2.25% of Mn, 0.30%-0.65% of Si, 0.020%-0.040% of Ti, less than or equal to 0.030% of P, less than or equal to 0.002% of N, less than or equal to 0.005% of S and the balance of Fe and inevitable impurities. The preparation method comprises the steps of smelting, hot rolling, acid pickling, cold rolling, continuous annealing galvanizing and finishing. The microstructure of the steel plate produced by the method is mainly composed of bainite and tempered martensite, and the steel plate has ultrahigh hole expansion rate and excellent forming performance.

The invention relates to a preparation method of 1180MPa-grade automobile steel produced by continuous annealing, which comprises the following steps: S1, smelting process: preparing molten steel from 0.17%-0.20% of C, 1.0%-1.5% of Si, 1.80%-2.30% of Mn, less than or equal to 0.008% of P, less than or equal to 0.005% of S, 0.01%-0.07% of Als, 0.15%-0.30% of Cr, 0.02%-0.06% of Nb, 0.01%-0.04% of Ti, less than or equal to 0.0045% of N and the balance of Fe and inevitable impurities, and Ceq = C + Si / 30 + Mn / 20 + 2P + 4S < = 0.41; s2, a slab is manufactured through continuous casting; s3, hot rolling; s4, acid pickling and cold rolling; and S5, continuous annealing. U-shaped coiling is adopted for hot rolling, so that the structure uniformity is improved; and the continuous annealing process is adjusted, and a product with ultrahigh strength and good plasticity and hole expanding performance is obtained.

The invention relates to a production method of thin cold-rolled strip steel for food cans, which comprises the following steps of: smelting molten steel according to preset smelting components, and continuously casting after smelting; the casting blank subjected to continuous casting enters a hot rolling procedure, the final rolling temperature of the casting blank corresponds to the carbon content, and finally hot-rolled strip steel with the thickness of 2.0-2.3 mm is obtained; hot-rolled strip steel enters a rolling procedure after being subjected to acid rolling uncoiling, a five-rack rolling mode is adopted for acid rolling, and the total reduction rate is controlled to be 91%; coiling and then entering a continuous annealing process; in the annealing furnace, the annealing temperature and the strip steel speed are in a proportional relation, and finally finished strip steel is obtained. The thin-gauge strip steel can be produced at a high cold rolling speed, meanwhile, vibration of the rolling mill is effectively relieved, the production cost is reduced, and the product quality is not affected.

The present invention provides a technique capable of accurately obtaining, for a steel sheet to be produced, desired mechanical characteristics.　A method for controlling steel sheet production facility includes: a mechanical characteristic prediction step (S3) for predicting mechanical characteristic values including the elongation value and the hole expansion rate of a steel sheet, on the basis of a steel sheet heating temperature in a tempering zone (16) measured by a temperature measurement device (20); a heat treatment condition calculation step (S4) for correcting the mechanical characteristic values predicted in the mechanical characteristic prediction step (S3) to target mechanical characteristic values of the steel sheet (S), and determining a heat treatment condition on the basis of the corrected mechanical characteristic values; and a heat treatment condition control step (S8) for controlling, on the basis of the heat treatment condition determined in the heat treatment condition calculation step (S4), the steel sheet heating temperature in at least a rapid heating zone (9) in continuous annealing equipment.

The invention discloses a 1180MPa-grade ultrahigh-strength steel plate for an automobile and a preparation method of the 1180MPa-grade ultrahigh-strength steel plate, and belongs to the technical field of cold-rolled strip production. The steel plate comprises the following chemical components in percentage by mass: 0.17%-0.20% of C, 1.2%-1.6% of Si, 1.70%-2.10% of Mn, less than or equal to 0.008% of P, less than or equal to 0.005% of S, 0.30%-0.50% of Al, 0.15%-0.30% of Cr, 0.08%-0.12% of V, less than or equal to 0.0045% of N and the balance of Fe and impurities, wherein Ceq = C + Si / 30 + Mn / 20 + 2P + 4S < = 0.41. The preparation method comprises the steps of smelting, continuous casting, hot rolling, pickling cold rolling and continuous annealing. Through alloy component design and process collaborative optimization, the prepared ultrahigh-strength steel plate has high strength, high plasticity and high reaming performance, and the problem that existing bainite complex-phase steel is poor in comprehensive performance can be effectively solved.

The invention discloses an alloyed hot-dip galvanized steel sheet, a substrate of the alloyed hot-dip galvanized steel sheet contains 0-1.0% by mass of Si, the average Fe content in an alloyed hot-dip galvanized layer of the alloyed hot-dip galvanized steel sheet is 7-10% by mass, and the surface phase structure of the alloyed hot-dip galvanized layer contains a columnar zinc-iron alloy phase, the ratio R of the length to the width of the columnar zinc-iron alloy phase is greater than or equal to 2 and less than or equal to Rlt; 7. The pulverization grade of the alloyed hot-dip galvanized steel plate is smaller than or equal to 6 grade, and the pulverization resistance is good. The invention further discloses a manufacturing method of the alloyed hot-dip galvanized steel plate, the manufacturing method is suitable for the low-silicon steel plate, and the alloy phase structure of a steel plate coating is controlled by controlling the air-fuel ratio in the preheating stage in the continuous annealing step, the dew point DP in the soaking stage and the alloying temperature in the alloying step, so that the pulverization resistance of the steel plate is improved.

The invention provides 1700MPa-grade hot-formed steel with high cold bending performance and a preparation method and application thereof. The surface layer of the hot-formed steel has a soft-phase ferrite structure, the secondary surface layer of the hot-formed steel has a mixed structure of soft-phase ferrite and martensite, and the core layer of the hot-formed steel has a carbon-poor martensite structure. The preparation method comprises any one or a combination of at least two of the following conditions: (A) the coiling temperature after hot rolling is 650-700 DEG C; (B) the pickling speed is less than or equal to 150m / min; (C) the continuous annealing temperature is 780-830 DEG C; (D) the atmosphere in the furnace is mixed gas of nitrogen and hydrogen; and (E) the dew point temperature is-35 DEG C to-17 DEG C. Through fine component design and process integration, the contradiction between the strength and the toughness of the material is successfully solved, double guarantee of high strength and high toughness is achieved, meanwhile, the requirement for light weight is met, and the competitiveness of an existing product is improved.