408 results about "Continuous annealing" patented technology

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 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 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 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 discloses economical high-hardness low-grade aluminum-free non-oriented silicon steel and a preparation method thereof. The economical high-hardness low-grade aluminum-free non-oriented silicon steel comprises the following components in percentage by mass: less than or equal to 0.003% of C, 0.50-0.70% of Si, 0.25-0.65% of Mn, 0.09-0.10% of P, less than or equal to 0.0040% of S, less than or equal to 0.0010% of Al and the balance of Fe and inevitable impurities. On the basis of low-cost aluminum-free high-phosphorus component design, the electromagnetic performance and the mechanical performance are improved by increasing the content of Si, adding and controlling strengthening elements, strictly controlling the process temperature control precision in the hot rolling production process and optimizing the temperature and speed process setting of the continuous annealing process; the high-hardness low-cost aluminum-free non-oriented silicon steel suitable for the high-speed punching machine is produced, so that the aluminum-free non-oriented silicon steel has excellent magnetic characteristics and high hardness, and the requirement of a user for high efficiency in motor stator and rotor punching sheet production is met.

The invention discloses a short-process preparation method of a palladium-silver-copper alloy wire with high palladium content, which comprises the following steps: 1) smelting, blowing out, refining and casting silver, copper and palladium to obtain a palladium-silver-copper master alloy ingot; 2) continuously casting the palladium-silver-copper master alloy ingot into a palladium-silver-copper alloy rod; (3) the palladium-silver-copper alloy rod is continuously rolled, and the total deformation of the palladium-silver-copper alloy rod is controlled to range from 60% to 80% till a palladium-silver-copper alloy thick wire is obtained; and 4) carrying out continuous annealing and drawing on the palladium-silver-copper alloy thick wire to obtain the palladium-silver-copper alloy wire with the diameter of 0.1-0.8 mm. By the adoption of the method, the palladium-silver-copper alloy rod with the good machining performance can be prepared, alloy wires with the tensile strength higher than 1200 MPa and the Vickers hardness larger than 350 HV can be continuously produced in batches, the cleanliness and splatability of the alloy wires both meet the first-level / A-level requirements, and meanwhile the production period is only 30% of that of a traditional technology.

The invention discloses continuous annealing equipment and an annealing process for round steel bar annealing, and relates to the technical field of metal heat treatment equipment and processes, the continuous annealing equipment comprises an annealing furnace barrel, an annealing box heating pipe and a base, one side face of the annealing furnace barrel is fixedly communicated with an annealing box, and a public self-driving assembly is arranged in the annealing box. The rotary cylinder and the supporting disc are driven through the public self-driving assembly, the round steel bars are kept to rotate synchronously before and after entering the annealing box, continuous circulation and rotary annealing are achieved, compared with traditional stacking annealing, the round steel bars on the inner side of a material pile can also fully absorb heat, and therefore the problems that temperature distribution is uneven, and temperature rise of part of the steel bars is too slow are solved; therefore, the uniform annealing effect of each round steel bar is guaranteed, the internal structure uniformity, the hardness stability and the subsequent machining performance of the product are remarkably improved, and the machining safety and reliability of the material are improved.

The invention relates to a control method for improving EDT roller texturing efficiency and high-surface automobile aluminum plate oil storage amount. The control method comprises the steps that (1) a single-rack cold rolling mill is adopted; (2) carrying out roller surface treatment by adopting an electrode electric spark roller grinder, wherein the roughness Ra of a working roller before roughening is less than or equal to 0.4 mu m; the roughness Ra after EDT roughening is equal to 1.95 to 2.2 [mu] m; (3) a single-rack cold rolling mill is adopted for production, the rolling oil temperature is 35 + / -5 DEG C, and the rolling oil pressure is 6.0-9.0 bar; (4) an air cushion type continuous annealing line is adopted for cleaning and solid solution aging treatment; (5) carrying out surface appearance and pit size measurement on the prepared aluminum plate by adopting a 3D optical microscope; and (6) the manufactured aluminum plate is measured through a 3D non-contact optical contourgraph. By means of the method, the requirements for the surface roughness Ra and Rpc of the automobile sheet can be met, the downstream stamping cracking risk and the corrosion spot defect caused by the too large surface pit diameter are reduced, the better high-surface automobile sheet, the higher aluminum sheet surface oil storage amount and the lower friction coefficient can be obtained, and the EDT roller texturing working time can be saved.

The invention discloses a continuous annealing furnace for nickel-based superalloy and a process of the continuous annealing furnace, and relates to the technical field of nickel-based superalloy annealing, the annealing furnace comprises a supporting table and an annealing furnace body arranged at the upper end of the supporting table, the annealing furnace body comprises a feeding transfer chamber, a preheating chamber and a soaking chamber which can be communicated in sequence and can be independently sealed; the process comprises the following steps of S1, nickel-based high-temperature alloy part feeding, S2, inert gas conveying, S3, annealing treatment and S4, cooling treatment. According to the device, heat loss can be greatly reduced, air can be prevented from entering the device, the possibility that parts are oxidized is effectively avoided, the step of removing oxygen is reduced, meanwhile, the supporting position of the trapezoidal plate on the parts can be changed, follow-up preheating and soaking work on the parts is facilitated, the annealing and cooling quality is ensured, and the parts are treated more uniformly.

Disclosed is an alloyed hot-dip galvanized steel sheet in which 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 10-12% by mass, and the surface phase structural composition of the alloyed hot-dip galvanized layer contains a polygonal zinc-iron alloy phase, the ratio R of the length to the width of the polygonal zinc-iron alloy phase is not less than 1 and not more than Rlt; 2. The alloyed hot-dip galvanized steel plate is good in deep drawability. 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, the alloy phase structure of a steel plate coating is controlled by controlling the air-fuel ratio in the preheating stage and the dew point DP in the soaking stage in the continuous annealing step and the alloying temperature in the alloying step, and therefore the deep drawing performance of the steel plate is improved.

The invention discloses a preparation method of low-phosphorus high-strength deep drawing steel. The preparation method comprises the following steps: 1) converter production; 2) RH furnace production; 3) continuous casting production; 4) heating the casting blank; (5) the finish rolling temperature of finish rolling is 890-940 DEG C, and the coiling temperature is 570-600 DEG C; 6) a continuous annealing process; the high-strength deep drawing steel comprises the following chemical components in percentage by weight: less than or equal to 0.0030% of C; s is smaller than or equal to 0.15%; mn < = 0.75%; p is less than or equal to 0.040%; less than or equal to 0.015% of S; al t is greater than or equal to 0.015%; t > = 0.040%; n is less than or equal to 0.0040%, and the balance is Fe and inevitable impurities. By reducing the content of the P element and optimizing the component design and the preparation process, the purpose of improving the formability of the 180 MPa-grade high-strength deep drawing steel is achieved while the mechanical property requirement of the 180 MPa-grade high-strength deep drawing steel is met, and the requirement of the market for high-performance steel is met.

The invention discloses a production method of low-cost cold-rolled dual-phase steel DP980 with yield strength of 550-760 MPa, which comprises the following steps: (1) smelting and continuous casting: molten steel for a casting machine comprises the following components in percentage by mass: 0.090-0.120% of C, 0.40-0.60% of Si, 2.40-3.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.015-0.045% of Alt, 0.10-0.30% of Cr, 0.020-0.045% of Nb, 0.015-0.035% of Ti, 0.0008-0.0030% of Ca and 0.0030-0.0070% of N; (2) hot rolling; (3) pickling and cold rolling; and (4) continuous annealing and leveling. The cold-rolled dual-phase steel disclosed by the invention has the characteristics of low yield ratio, high elongation percentage, excellent formability and the like.

The invention relates to a wire annealing process (1) for annealing a wire (7), in particular a metallic wire, in a continuous process with two contact discs (2, 3), an annealing section (4) arranged between them and annealing media for annealing the wire (7) in the annealing section (4). The wire annealing furnace (1) further comprises a first temperature sensor (9) for generating at least one first temperature measurement for the temperature of the wire (7) and a control device for controlling the temperature of the wire (7) to a setpoint temperature value, which is configured to control the annealing power generated by the annealing media as a function of the at least one first temperature measurement value such that the first temperature measurement value is essentially equal to the setpoint temperature value. The setpoint temperature value corresponds to a recrystallization temperature of the wire (7). In this way it is possible to set and maintain the temperature of the wire (7) in the annealing section (4) as precisely as possible at the value of the desired recrystallization temperature.

The invention discloses a non-oriented electrical steel plate with excellent blanking processing performance, which contains Fe and inevitable impurities, and also contains the following chemical elements in percentage by mass: 0 < C < = 0.004%, 0.8-2.2% of Si, 0.05-0.5% of Mn, 0.005-0.15% of P, 0 < Al < = 0.1%, 0.0003-0.01% of Ca + Ce, and the balance of Fe and inevitable impurities. Wherein the value of Si / 10 is 0.53%-22%. The invention also discloses a manufacturing method of the non-oriented electrical steel plate. The manufacturing method comprises the following steps: smelting and casting; heating and hot rolling; performing cold rolling after pickling; and continuous annealing: the soaking time is controlled to be 5-60 s, and the soaking temperature T is equal to 850 + 11a * {[Si] / (10 * [P])}. According to the non-oriented electrical steel plate and the manufacturing method thereof, the non-oriented electrical steel plate has a proper iron loss coefficient and excellent electromagnetic performance, and meanwhile, the non-oriented electrical steel plate also has good blanking processing performance.

The invention discloses IF steel with low carbon footprint, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0 < C < = 0.0030%, 0 < Si < = 0.03%, 0.05-0.20% of Mn, 0.06-0.09% of Ti, 0.02-0.06% of Al, 0.005-0.01% of N, and the balance of Fe and inevitable impurities. 0.01 to 0.015 percent of S; b: 0.0002% to 0.0006%; wherein in the inevitable impurities, O is controlled to be less than or equal to 0.0040%. The invention also aims to provide a manufacturing method of the IF steel with the low carbon footprint. The manufacturing method comprises the following steps: carrying out electric furnace smelting, LF (ladle furnace), RH (Ruhrstahl Heraeus) and continuous casting on full scrap steel; hot rolling and coiling; cold rolling; and continuously annealing.

The invention relates to the technical field of cold-rolled automobile steel, in particular to 600MPa-grade light ferrite steel and a preparation method thereof, and the steel comprises the following chemical components: 0.035%-0.045% of C, 0.3%-0.4% of Mn, 0.3%-0.4% of Si, 4.0%-5.0% of Al, less than or equal to 0.01% of P, less than or equal to 0.01% of S, less than or equal to 0.005% of N, 0.15%-0.20% of Nb, 0.15%-0.20% of Ti, 0.15%-0.20% of V and the balance of Fe and impurities. A light element Al is added on the basis of traditional cold-rolled ferritic steel; the production process of converter smelting, continuous casting, hot rolling, pickling and cold rolling and continuous annealing is adopted, the requirements for automobile lightweight and good stamping performance of automobile steel are met, and meanwhile the remarkable advantages of being low in production cost and stable in process are achieved.

The invention discloses an annealing process system of 300MPa galvanized low-alloy high-strength steel for industrial production. Thermal simulation is used for carrying out continuous annealing process simulation on an acid rolling product of the galvanized low-alloy high-strength steel; the sample is heated to the temperature of 630-850 DEG C at the speed of 4 DEG C / S, heat preservation is conducted for 90 s, and then the sample is cooled to the room temperature at the speed of 10 DEG C / S; the steel comprises the following chemical components in percentage by mass: 0.06%-0.08% of C, less than or equal to 0.040% of S i, 0.35%-0.45% of Mn, less than or equal to 0.020% of P, less than or equal to 0.01% of S, 0.020%-0.050% of Alt, 0.010%-0.18% of Nb, 0.0008%-0.0020% of Ca and the balance of Fe. And the balance of Fe and impurities. The mechanical properties of products produced industrially in batches are as follows: the yield strength is 310-359 MPa, the tensile strength is 388-420 MPa, and the elongation is 29.5-40%.

The application discloses a 500MPa grade precipitation strengthening type high-strength steel and a manufacturing method. Chemical component composition and mass percentage thereof are as follows: C: 0.035-0.055%, Si: 0.05-0.09%, Mn: 1.00-1.20%, P: 0.010% or less, S: 0.006% or less, Al: 0.08-0.11%, V: 0.13-0.17%, Bi: 0.03-0.05%, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: steelmaking, hot rolling, coiling, pickling, continuous annealing / hot-dip galvanizing. The microstructure of the high-strength steel is ferrite and pearlite, and a large number of dispersed precipitates are uniformly distributed in the ferrite matrix and grain boundary; the strength fluctuation of the head, middle and tail of the coil is less than or equal to 20MPa; the yield point elongation can be eliminated without large flattening; the high-strength steel is easy to be stably produced in industrialization, and has excellent comprehensive performance.

The invention discloses an edge-crack-free cold-rolled corrosion-resistant steel strip and a production method of the edge-crack-free cold-rolled corrosion-resistant steel strip. The cold-rolled corrosion-resistant steel strip without edge cracks comprises the following components in parts by weight: 0.05 to 0.08 part of C, 0.40 to 0.70 part of Mn, 0.50 to 1.10 parts of P, less than 0.02 part of S, 0.35 to 0.60 part of Cu, 0.015 to 0.050 part of Als, 0.05 to 0.20 part of Sb, 0.0030 to 0.0080 part of B, 0.40 to 0.80 part of Si and 0.040 to 0.060 part of Ti. The production method of the edge-crack-free cold-rolled corrosion-resistant steel strip comprises the following steps: pretreating molten steel; converter steelmaking; secondary refining is carried out, and chemical components in the molten steel are adjusted to target values; the steel ingot is heated to 1180-1250 DEG C, the high-temperature heat preservation time ranges from 80 min to 120 min, the tapping temperature ranges from 1180 DEG C to 1220 DEG C, and hot rolling is conducted; pickling, cold rolling and continuous annealing. According to the invention, a small amount of B, Si and Ti elements are added into the steel to form a cold-rolled corrosion-resistant steel strip component system without edge cracking, and a reasonable production process is matched, so that excellent cold-rolled weather-resistant corrosion-resistant steel without edge cracking can be obtained, and the problems of strip breakage and edge cracking of products caused by edge microcracks during acid rolling are solved.

This invention discloses a method for manufacturing 50W470 high-magnetic-induction, low-iron-loss non-oriented electrical steel without normalization, comprising: hot iron pretreatment; centralized stacking of cast billets; hot rolling on a 2250mm production line; rolling the hot-rolled coil to 0.50mm using a 5-stand acid continuous rolling mill with a total reduction rate of 78%; and rapid heating in the continuous annealing furnace heating section. Its chemical composition by mass percentage is: C: ≤0.0025%, Si: 1.65~1.85%, Mn: 0.20~0.40%, P: ≤0.030%, S: ≤0.004%, Als: 0.50~0.70%, N: ≤0.0020%, O ≤0.0020%, Ti: ≤0.0025%, Nb ≤0.0030%. The purpose of this invention is to achieve full-process production and control of low iron loss and high magnetic induction performance, ensuring that the magnetic properties meet market and user requirements.

The invention belongs to the field of automobile steel manufacturing, and particularly relates to 400 MPa-grade high-strength cold-rolled automobile inner and outer plate steel based on an ultra-fast heating and continuous annealing technology and a preparation method of the 400 MPa-grade high-strength cold-rolled automobile inner and outer plate steel. The steel comprises the following chemical components in percentage by mass: 0.003%-0.008% of C, 0.3%-0.7% of Mn, 0.01%-0.08% of Si, 0.02%-0.06% of Ti, less than or equal to 0.03% 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 yield strength of the steel plate is 240-320 MPa, the tensile strength is 400 MPa or more, the percentage elongation after fracture A80 is 36% or more, the plastic strain ratio r is 2.0 or more, and the strain hardening index n is 0.2 or more.

The invention discloses 590MPa-grade reinforced plastic dual-phase steel for continuous annealing and a narrow lap welding method of a continuous annealing process of the 590MPa-grade reinforced plastic dual-phase steel. The 590MPa-grade reinforced plastic dual-phase steel comprises the following chemical components in percentage by weight: 0.09-0.15% of C, 0.40-0.80% of Si, 1.30-1.80% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.010-0.045% of Ti, 0.0010-0.0035% of B, 0.020-0.070% of Als and less than or equal to 0.006% of N. And the balance of Fe and inevitable impurities. According to the method, the joining material and the raw material steel coil are sheared and then welded, and the welding seam quality is checked by measuring the welding seam thickness and performing a cup drawing test after welding; therefore, the technical problems that in the prior art, the production process is unstable, and the production efficiency is not high are effectively solved, and the purpose that stable and efficient hot galvanizing process production of the reinforced plastic dual-phase steel for 590 MPa continuous annealing can be guaranteed is achieved.

The utility model relates to the technical field of hot-dip galvanized wire production annealing, in particular to a continuous annealing furnace for hot-dip galvanized wire production, which comprises a furnace body. The furnace comprises a furnace body and further comprises a supporting transverse plate, an open groove, a driven shaft, a storage plate, a connecting groove, a first motor, a driving shaft and a connecting plate, the supporting transverse plate is arranged in the middle of the interior of the furnace body, the open groove is formed in the center of the top of the supporting transverse plate, the driven shaft is rotationally connected to the bottom end of the interior of the open groove, the storage plate is arranged at the top end of the driven shaft, and the connecting groove is formed in the middle of the top of the storage plate; a first motor is arranged in the center of the top of the furnace body. The output end of the bottom of the first motor is connected with a driving shaft. The first motor drives the driving shaft to rotate, the driving shaft drives the connecting plate to rotate, the connecting plate is connected with the connecting groove to drive the object placing plate to rotate, the object placing plate drives the driven shaft to rotate, and at the moment, the steel belt in the object placing groove rotates along with the driven shaft; and the steel strip is uniformly heated by flame ejected from the fire-jet head.

The application provides a hot-dip aluminum-silicon 980MPa Q&P steel cold forming steel plate and a preparation method thereof, and the component of the hot-dip aluminum-silicon base plate is as follows in percentage by mass: C: 0.18% to 0.24%, Si: 1.4% to 2.8%, Mn: 1.9% to 2.5%, P: less than or equal to 0.02%, S: less than or equal to 0.005%, Ti: 0.01 to 0.04%, Nb: less than or equal to 0.04%, Al: less than or equal to 0.005%, and the balance of Fe and inevitable impurities. The preparation method comprises a series of processes such as smelting, hot rolling, pickling, cold rolling, continuous annealing hot-dip aluminum-silicon, and finishing, and the hot-dip aluminum-silicon is ingeniously carried out in the slow cooling stage, perfectly matches the heat treatment system, breaks the limitation that the hot-dip galvanized steel plate must be over-aged at high temperature for a short time, and can make the bainite transformation sufficient; the hot-dip aluminum-silicon 980MPa Q&P steel produced by the application has excellent strength and plasticity.

The application discloses a continuous annealing furnace heating performance uncertainty evaluation method and system, and relates to the technical field of heat treatment equipment state evaluation, and comprises the following steps: based on the heating mode of copper strip heat treatment, the heat energy input of the heating system and the heat absorbed by the copper strip per unit time are calculated; based on the resistance change rate of the electric heating element of the heating system and the air-fuel ratio deviation coefficient of the heating system, a system state factor is constructed; based on the heat energy input of the heating system, the heat absorbed by the copper strip per unit time and the system state factor, a heat energy transfer index is constructed; the mean value and the variance of the heat energy transfer index are calculated through the first-order second-moment method; based on the mean value and the variance of the heat energy transfer index, a target normal distribution to which the heat energy transfer index is subjected is constructed; and based on the target normal distribution, the heat energy transfer index is mapped into the probability distribution of a plurality of discrete score sections. The application alleviates the technical problems of possible deviation and even misjudgment existing in the traditional deterministic evaluation method.

Disclosed is an ultra-high-strength steel having excellent plasticity, comprising in mass percent the chemical elements: C: 0.26-0.30 wt %; Si: 0.8-1.00 wt %; Mn: 2.80-3.30 wt %; Al: 0.04-0.08 wt %; with the balance being Fe and other inevitable impurities. Also disclosed is a manufacturing method for manufacturing the ultra-high-strength steel having excellent plasticity, comprising the following steps: (1) smelting and thin slab continuous casting; (2) heating; (3) hot rolling, wherein an oxide scale on the surface of a hot-rolled steel strip has a thickness of ≤6 μm, and (FeO+Fe3O4)≤40 wt % in the oxide scale on the surface of the hot-rolled strip steel; (4) acid pickling or acid pickling and cold rolling; and (5) continuous annealing: annealing at 800-920° C. and performing slow cooling at 3-10° C. / s to 690-760° C.; performing fast cooling to 250-350° C. at 50-100° C.; and then heating to 360-460° C., maintaining the temperature for 100-400 s and cooling to room temperature.

The invention provides a regression model establishing and predicting method for cold-rolled low-carbon steel surface roughness, relates to the technical field of cold rolling, and aims to solve the technical problem that in the prior art, the surface roughness of cold-rolled low-carbon steel strip steel cannot meet individual requirements of customers through advanced design. The method comprises the following steps: selecting low-carbon steel with specific chemical components of 0.01-0.065% of C, less than or equal to 0.03% of Si and a coiling temperature of 630-730 DEG C, measuring the roughness of five points on the surface of the cold hard coil, and calculating an average value of Ra; the concentration of the continuous annealing leveling liquid is controlled to be larger than 2.5%, the roughness of a working roller is controlled to be 2.3-2.8 micrometers, the elongation is selected, the rolling force and the kilometers of the roller are counted, and the roughness of a finished product is measured; the roughness of the raw material, the rolling force of the temper mill, the elongation of the temper mill and the kilometers of the rollers are used as independent variables, the roughness of the finished product is used as a dependent variable, and a mathematical expression is obtained by fitting a regression model through Minitab; and finally, according to customer demands, substituting preset parameters for prediction and optimization. The surface roughness is preset in advance, the unqualified risk is reduced, the test period is shortened, and the method is suitable for industrial mass production.

The invention relates to the technical field of non-oriented silicon steel, in particular to low-cost high-performance non-oriented silicon steel and a preparation method. The steel comprises the following chemical components in percentage by weight: less than or equal to 0.0027% of C, less than or equal to 1.3% of Si, less than or equal to 1.4% of Als, less than or equal to 0.5% of Mn, 0.05%-0.30% of P, 0.003%-0.0045% of S, less than or equal to 0.002% of N, 0.0004%-0.0025% of B, less than or equal to 0.0040% of Nb + V + Ti and the balance of Fe and inevitable impurities. The heating and tapping temperature is controlled to be 1000-1150 DEG C, hot rolling is conducted, the finish rolling temperature is controlled to be 850-1000 DEG C, the coiling temperature is controlled to be 700-800 DEG C, and improvement of the structure of a hot-rolled plate is promoted; cold rolling is carried out to control the specification of a corresponding finished product, and crystallization and grain growth are completed at the temperature of 780-950 DEG C in a soaking section of a continuous annealing unit. And compared with the main body alloy element silicon, the electromagnetic performance of the product is greatly improved under the same-grade original process condition.

The present application relates to the field of cold-rolled strip continuous annealing, in particular to a cold-rolled strip continuous annealing equipment, comprising a high-temperature box body; a feeding port and a discharging port are respectively arranged at two ends of the high-temperature box body; a plurality of transmission rollers are rotationally connected in the high-temperature box body; the transmission rollers are arranged in an up-and-down staggered manner; a first motor is fixedly connected to a side wall of one end of the high-temperature box body; an output end of the first motor is fixedly connected with one of the transmission rollers; a transmission assembly is arranged between adjacent two transmission rollers; the strip steel sequentially passes through the up-and-down staggered transmission rollers, so that the strip steel is arranged in a wave shape in the high-temperature box body; in the same size high-temperature box body, the wave-shaped arranged strip steel is longer than the horizontally arranged strip steel, and more strip steels can be annealed at one time; the first motor makes all the transmission rollers rotate simultaneously and in the same direction through the transmission assembly, so that the annealed strip steel moves to the discharging port, and the strip steel to be annealed enters the high-temperature box body for annealing.

The invention discloses a strip shape control method for ultrahigh-strength low-alloy high-strength steel. The production steps include smelting, continuous casting, hot rolling, acid rolling and continuous annealing. Aiming at the pain and difficulty problem that the shape of a low-alloy high-strength steel plate with the yield strength of 800MPa is not easy to control, structure property control is taken as a breakthrough, Nb + Ti is more than or equal to 0.085% and less than or equal to 0.110%, Cr is more than or equal to 0.15% and less than or equal to 0.50%, the in-roll strength difference is less than or equal to 50MPa, and the plate shape control difficulty in a flattening process is reduced; by taking reduction of wave heredity as a breakthrough, a combined measure of a coiling temperature of 550 + / -30 DEG C, a wedge mean value of + / -10 microns and an acid rolling reduction rate of 45-55% is innovatively provided, the acid rolling plate shape is stably controlled to be less than or equal to 20 IU, and the plate shape control difficulty of a leveling process is reduced; the plate shape control capability of the temper mill is remarkably improved through the matching design of the diameter of the working roll, the leveling elongation, the roll bending force distribution and the roll shifting rule by taking the exertion of the capacity of the temper mill as a breakthrough. The plate shape qualification rate of the low-alloy high-strength steel with the yield strength of 800 MPa is increased to 90% or above from 20% or below, and stable production is achieved.