3352 results about "Continuous casting" patented technology

The invention relates to the technical field of steel production plan optimization based on multi-dimensional constraint dynamic coupling, in particular to a molten iron operation plan arrangement method based on dynamic constraint modeling hybrid optimization, which comprises the following steps: acquiring order data, equipment state data and constraint rule data to generate structured input parameters comprising order priority labels; constructing a multi-objective optimization model based on the molten iron distribution constraint and the maintainable time length of the equipment, extracting the maintenance conflict relationship between the equipment groups, constructing a maintenance rule knowledge graph, and generating a dynamic constraint condition set; generating an initial molten iron distribution and maintenance plan through global search by adopting a genetic algorithm, and outputting a molten iron distribution path and an equipment maintenance time sequence through local optimization by combining a linear programming algorithm; according to the method, dynamic collaborative optimization of molten iron distribution and equipment maintenance is achieved, and the resource utilization rate, the order delivery rate and the production system stability are improved.

The invention relates to the technical field of aluminum foil processing, in particular to a method for producing high-stability 3102 alloy air-conditioning foil in a short process, which comprises the following steps of: smelting, continuously casting and continuously rolling an aluminum alloy raw material to obtain a strip, directly trimming the strip, rolling the strip on a cold rolling unit, preparing a cold-rolled coil with the thickness of 0.15-0.2 mm after three-pass rolling, rolling the cold-rolled coil by an aluminum foil rolling mill, and rolling the cold-rolled coil by an aluminum foil rolling mill to obtain the high-stability 3102 alloy air-conditioning foil. The tensile strength of the aluminum foil finished product is 135-139 Mpa, the ductility is larger than or equal to 19%, and the cupping is larger than or equal to 5.9 mm. The aluminum foil finished product is suitable in tensile strength, small in fluctuation range, higher in ductility and cupping value, capable of better meeting the use requirements of air conditioner foil, capable of guaranteeing the product quality and meanwhile capable of improving the product quality. According to the method, the production process is greatly shortened, the production cost is reduced, and the production efficiency is improved.

The invention belongs to the technical field of aluminum alloy production, and particularly discloses a low-carbon, low-cost and safe method for producing a 4343 alloy blank, raw materials are weighed according to a certain proportion, an aluminum melt obtained through smelting in a smelting furnace is refined and subjected to on-line degassing and filtering, the 4343 alloy blank is produced through a continuous casting and rolling method, a finished product is small in crack edge, segregation of internal components of the material is small, and the production cost is low. The method has the advantages that secondary aluminum can be used as raw materials in a large proportion, low carbon and consumption reduction are achieved, and the method is different from a traditional casting production mode, a matched casting deep well is not needed, the phenomenon that cooling water is accumulated in the deep well or a narrow area is avoided, and the explosion problem possibly occurring after high-temperature aluminum water makes contact with the cooling water is avoided; the production process is simple, the safety degree is high, aluminum-strontium alloy is not needed in the production process, the production cost is reduced, and meanwhile the strontium poisoning phenomenon caused by misoperation of field operators is completely eradicated.

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 belongs to the technical field of aluminum alloy production, and particularly discloses a low-carbon environment-friendly method for producing a 3104 alloy blank with a high secondary aluminum proportion, which comprises the procedures of smelting, melt purification, online degassing filtration, continuous casting and triple continuous rolling, and is characterized in that alloy components are optimized, secondary aluminum waste is used in a large proportion, the Fe content is increased, and the production cost is reduced. Iron and elements such as manganese in the aluminum alloy form intermetallic compounds, the intermetallic compounds can serve as heterogeneous nucleation, obviously refine alloy grains during casting and increase Fe content, the performance of the 3104 alloy blank is improved, meanwhile, aluminum is replaced with iron, the main material cost can be reduced, in addition, due to the fact that the rolling temperature of an inlet of each rack is high, and meanwhile the finish rolling temperature is also high, the service life of the 3104 alloy blank is prolonged. The self-tempering effect is achieved, internal dislocation of materials is eliminated, the blank edge cracking condition is improved, strip breakage caused by the edge cracking problem in the subsequent rolling process is avoided, safe production is guaranteed, the main material cost is reduced, meanwhile, the blank performance is improved, the 3104 alloy blank is efficiently produced in a high-quality mode, and the purposes of low carbon and environment protection are achieved.

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 discloses a manufacturing method of a high-efficiency and low-cost steel plate for a 345MPa-grade low-temperature pressure vessel, and belongs to the technical field of low-carbon microalloyed steel production. The manufacturing method comprises the steps of molten steel smelting, LF refining, RH vacuum degassing, continuous casting, casting blank heating, rolling, controlled cooling and straightening. The problems that steel plate rolling efficiency is low, rolling resistance is large, and the plate shape is not easy to control are solved, the steel plate is low in cost, high in strength and toughness and high in straightness, and the service safety of the steel plate for the low-temperature pressure container can be guaranteed.

The invention discloses a preparation method of a precise seamless steel tube for a drill rod of a rotary drilling rig, and relates to the field of steel tubes. Comprising the following steps that raw materials are prepared and smelted, molten iron or high-purity waste steel with low phosphorus content, low sulfur content and low gas content is selected as a main raw material, and then the main raw material is subjected to external refining, component fine adjustment and continuous casting and blank treatment; hot piercing is carried out, specifically, the continuous casting round billet is loaded into an annular heating furnace, a multi-section heating system is adopted for heating, and then hot piercing treatment is carried out in a two-roller skew rolling piercing machine; hot rolling extension is conducted, specifically, the perforated tubular billet is rapidly fed into an online heating furnace, and then rolling is conducted on a multi-rack retained core rod or full-floating core rod continuous pipe rolling machine; and sizing / reducing, and rapidly heating. The steel pipe has rigidity, strength and humanity, the fatigue life of the steel pipe is prolonged, meanwhile, the surface smoothness of an inner hole is high, the dimensional tolerance of the inner diameter and the outer diameter is accurate, the wall thickness uniformity is high, the straightness is good, and in addition, the steel pipe also has high internal cleanliness and good wear resistance.

A copper-aluminum composite plate material prepared by aluminum liquid continuous casting and a process thereof. The method includes: S1, heating an aluminum ingot to 700-800° C. and smelting for 1-3 h; S2, degassing smelted aluminum liquid, and keeping the temperature and standing; S3, texturing a copper strip, and then cleaning; S4, heating the pretreated copper strip to 200-650° C.; S5, under the protection of inert gas, continuously casting the treated aluminum liquid on the treated copper strip, performing quenching crystallization on a copper-aluminum composite material, and performing oxygen-free continuous casting; and S6, continuous rolling: rolling the continuously cast copper-aluminum composite material to obtain the copper-aluminum composite plate material prepared by aluminum liquid continuous casting.

The invention discloses a method for preparing 3003 alloy container aluminum foil from high-regeneration aluminum. The method comprises the specific steps of smelting, continuous casting and rolling, homogenizing annealing, cold foil rolling, finished product annealing and checking and packaging. During smelting, the secondary aluminum waste and the electrolytic aluminum liquid are used at the same time, the quality of the aluminum melt is guaranteed, and therefore the short-process technology that high-proportion secondary aluminum waste is used, and continuous casting and continuous rolling coils are directly produced through the electrolytic aluminum liquid is achieved; a continuous casting and rolling production process is adopted to directly use aluminum melt to produce an aluminum coil with the thickness of 3-5mm, so that 1-2 rolling passes can be directly reduced, energy is saved, consumption is reduced, the production cost is reduced, and obvious economic benefits and social benefits are achieved; compared with 25-30 hours of homogenizing annealing of cast-rolled blanks in the prior art, the time is shortened by 5 hours, the material production process flow can be simplified, the operation intensity of staff is relieved, the metal in-process time is saved, and the production cost is reduced.

The invention discloses 15Ni steel for an ultralow-temperature liquid hydrogen storage tank and a preparation method of the 15Ni steel, and belongs to the technical field of metallurgy. The 15Ni steel comprises the following chemical components in percentage by mass: 0.02%-0.07% of C, 0.10%-0.30% of Si, 0.20%-0.80% of Mn, 0.15%-0.30% of Mo, 0.020%-0.050% of Al, 12.5%-15.5% of Ni, 0.0015%-0.0060% of N, less than or equal to 0.008% of P, less than or equal to 0.002% of S, less than or equal to 0.020% of Nb, less than or equal to 0.080% of V, less than or equal to 0.020% of Ti and the balance of Fe and inevitable impurities. The preparation method comprises the procedures of smelting, continuous casting, heating, rolling and heat treatment. The steel plate produced by the invention has excellent ultralow temperature (-269 DEG C) impact toughness, effectively solves the problems of brittle phase martensite precipitation and low strength of stainless steel at a low temperature of-196 DEG C, can replace stainless steel to be widely used for manufacturing large ultralow temperature liquid hydrogen storage tanks, and has wide application prospects.

The invention discloses a production method of a novel rare earth submerged arc welding wire steel wire rod for pipeline steel. The specific technological process is as follows. Blast furnace molten iron preparation, molten iron pretreatment, converter top and bottom combined blowing smelting, LF refining, VD vacuum treatment, small square billet continuous casting, steel billet heating, high-pressure water descaling, rough rolling, flying shearing, intermediate rolling, kick shearing, finish rolling, controlled cooling water tank, spinning, stelmor cooling, coil collecting, trimming, sampling inspection, collecting and bundling and weighing -a finished wire. According to the novel production method of the rare earth submerged arc welding wire steel wire rod for the pipeline steel, by adding rare earth elements and novel alloy elements, the comprehensive performance, including but not limited to the low-temperature toughness impact performance, strength, toughness, corrosion resistance and the like, of welding wire steel is improved. Meanwhile, the rare earth element and the nickel element are added, the smelting process is optimized, composition segregation and inclusions are reduced, the porosity is reduced, and the strength and toughness of the welding wire steel are improved.

The invention relates to large-specification alloy spring steel and a production method thereof. The control process comprises the steps of steelmaking, bloom continuous casting, heating cogging, coping flaw detection, anti-decarburization segmented spraying, small square billet heating, high-speed wire controlled rolling, stelmor wire controlled cooling and coil collecting and packaging. And the surface quality and the structure property uniformity of the wire rod are effectively improved by combining segmented spraying of the anti-decarburization coating with a refined controlled rolling and controlled cooling process, and the wire rod can be used for preparing the large-size high-strength automobile suspension spring.

The invention belongs to the field of metal materials, and provides a 70MPa-grade low-temperature container steel plate for hydrogen energy storage and transportation and a manufacturing method of the 70MPa-grade low-temperature container steel plate, and the steel plate comprises the following components in percentage by weight: 0.15%-0.18% of C, 0.12%-0.16% of Si, 0.74%-0.98% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 1.12%-1.44% of Ni, 0.47%-0.75% of Cr, 0.01%-0.02% of V, 0.11%-0.19% of Mo, 0.022%-0.034% of N, 0.002%-0.0028% of La and the balance of Fe and inevitable impurities. The manufacturing method comprises the steps of smelting, continuous casting, four-stage efficient slab heating, two-stage rolling, two-stage cooling and heat treatment. The steel plate produced by the method has good obdurability matching and high and low temperature service performance, and the steel plate has excellent hydrogen-induced crack resistance, sulfide stress cracking resistance and stress corrosion resistance; and the steel plate has good wear resistance, and meets the manufacturing and application requirements of the high-performance steel plate for hydrogen energy storage and transportation.

The invention introduces a short-process manufacturing process of aluminum foil for a high-strength 8021 alloy container, and relates to the technical field of aluminum foil processing, and the short-process manufacturing process comprises the following specific steps: S1, smelting; s2, on-line treatment of the melt; s3, continuous casting and rolling; s4, cold foil rolling; s5, annealing a finished product; and S6, checking and packaging. According to the method, homogenizing annealing and even after-process cold foil rolling production are not needed, components can be utilized, the blank can be discharged from a machine for preheating, blank waste heat can play a role in eliminating internal stress through low-temperature tempering, the subsequent rolling deformation resistance is reduced, and the low-carbon production concept is really practiced; the single-pass machining rate of cold foil rolling is larger, the number of rolling passes is smaller, rolling is easier, production is easier, the production cost of cold foil rolling and foil rolling can be effectively reduced, and economic benefits of industrial production are achieved.

The invention discloses a wire rod for 2000MPa-level prestressed steel with the large specification of 15mm and a preparation method of the wire rod, and belongs to the technical field of metal material preparation and metal pressure processing. The invention aims to develop a 15mm large-specification high-performance prestressed steel wire rod with a novel component system and a matched production process thereof, the tensile strength of the wire rod is greater than or equal to 1200MPa, and the percentage reduction of area (after aging) is greater than or equal to 30%; the product can be used as a large-specification high-strength high-speed rail plate prestressed steel wire and a 1960-2000MPa-grade high-performance prestressed steel wire and a steel strand. According to the method, the technological process of molten iron pretreatment, converter smelting, LF refining, RH refining, square billet continuous casting, casting billet slow cooling pit slow cooling, casting billet heating, high-pressure water descaling, controlled rolling and controlled cooling and PF line heat preservation channel slow cooling and a complete and controllable production process system are adopted; and the harsh requirements of large-size high-performance prestressed materials of modern important projects on the performance of the wire rod are met.

The invention relates to the technical field of aluminum alloy preparation methods, in particular to a control method for preparing an aluminum alloy rod, the aluminum alloy rod, electronic equipment and a storage medium. The method comprises the following steps: firstly, acquiring process parameters of a continuous casting machine and quality parameters of an aluminum alloy bar at an outlet, then comparing the quality parameters with corresponding target parameters, when the quality parameters do not accord with the target parameters, inputting the quality parameters and the process parameters into a regulation and control large model, and outputting parameter regulation and control quantity; and finally, controlling the continuous casting machine according to the parameter regulation quantity. The defect condition and the process parameters are obtained in real time, the operation of the large model is regulated and controlled according to the real-time condition, the continuous casting machine is dynamically controlled, and the defects generated by controlling casting of the aluminum alloy bar through static preset parameters are reduced.

The invention discloses an F-number-based crystallizer slag entrapment fault judgment method, which comprises the following steps of: acquiring process data in real time in a slab continuous casting production process, and acquiring crystallizer data and submersed nozzle data of continuous casting production, thereby acquiring a crystallizer liquid level fluctuation function F number and a ton steel heat extraction R number in a crystallizer at corresponding moments; the slag entrapment critical threshold value is determined according to historical production data, then the ratio of the crystallizer liquid level fluctuation function F number to the ton steel heat extraction R number in the crystallizer is compared with the slag entrapment critical threshold value, whether the slab has the slag inclusion defect or not is judged accordingly, and judgment of the crystallizer slag entrapment fault is achieved. According to the method, real-time judgment and forecasting of the slag entrapment fault of the crystallizer in field production are achieved, and smooth operation of the continuous casting process and treatment before rolling guidance are facilitated.

The invention relates to the technical field of metal material surface treatment, in particular to a preparation method of a hot galvanizing layer of a hot-rolled high-strength steel plate with high corrosion resistance. Firstly, a hot-rolled steel plate is formed after smelting, continuous casting and hot rolling; secondly, the corrosion-resistant hot-rolled high-strength steel plate is subjected to oil removal through alcohol and then put into a heat treatment furnace into which shielding gas can be introduced for hydrogen reduction; then, the corrosion-resistant hot-rolled high-strength steel plate subjected to hydrogen reduction is placed in a plating assistant agent to be soaked; then, the corrosion-resistant hot-rolled high-strength steel plate soaked with the plating assistant is soaked in a Zn-Al-Mg alloy plating solution for hot dipping; and finally, the hot-rolled high-strength steel galvanized plate obtained after hot dipping is taken out of the plating solution in the high-purity Ar protective atmosphere, and the hot-rolled high-strength steel galvanized plate is placed in a protective cover full of the high-purity Ar protective atmosphere to be naturally cooled to the room temperature. The corrosion resistance of the Zn-Al-Mg alloy coating on the surface of the hot-rolled steel plate can be effectively improved, and meanwhile, compared with other hot galvanizing technologies, the corrosion resistance is higher.

The invention relates to the technical field of metallurgical continuous casting production, in particular to a continuous casting blank movement tracking method, which comprises the following steps of: calculating the thermal deformation of each section of a casting blank according to the section temperature of the casting blank along the length direction in combination with the material thermal expansion coefficient and the section length at the corresponding section temperature, and generating the real-time correction position of the casting blank after a physical correction track is generated; on the basis of the real-time correction position, a preset casting blank benchmark reference position, the real-time pulling speed, the real-time cooling water amount, respective preset benchmarks and motion inertia deviations calculated on the basis of material physical properties and the real-time pulling speed, track prediction adjustment factors are generated; generating a compensation amount for the reference disturbance compensation amount by combining the matching degree of the visual solidification front edge and the model prediction, obtaining a position compensation value, superposing the position compensation value to the original trajectory, obtaining a final tracking trajectory, converting the final tracking trajectory into a servo control instruction, and dynamically correcting the casting blank tracking position. According to the invention, the precision, the dynamic performance and the intelligent performance of the continuous casting blank movement tracking are realized.

The invention relates to a high-performance non-quenched and tempered steel bar for a fan shaft and a manufacturing method of the high-performance non-quenched and tempered steel bar, and belongs to the field of iron-based alloys. The steel comprises the following chemical components in percentage by weight: 0.37 to 0.43 percent of C, 0.30 to 0.60 percent of Si, 1.20 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, 0.030 to 0.070 percent of S, less than or equal to 0.50 percent of Cr, 0.10 to 0.30 percent of Ni, less than or equal to 0.30 percent of Mo, less than or equal to 0.30 percent of Cu, 0.010 to 0.030 percent of Al, 0.005 to 0.025 percent of Ti, 0.05 to 0.15 percent of V, 0.0100 to 0.0200 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0015 percent of O and the balance of Fe and inevitable impurity elements. The manufacturing process comprises the steps of converter / electric furnace smelting, LF furnace refining, RH / VD furnace vacuum degassing, continuous casting, casting blank reheating, cogging rolling, flame cleaning, intermediate blank finishing, intermediate blank heating, bar rolling, cooling and stress relief tempering. The total cross-section structure of the bar is a ferrite and pearlite structure. The bending degree per meter is smaller than or equal to 0.5 mm, the surface defect depth is smaller than or equal to 0.10 mm, and the internal quality meets the A-level requirement of the GB / T4162 standard.

The present application relates to the technical field of metallurgy, and particularly relates to a production method of a large-wall-thickness pipeline steel with improved carbon dioxide corrosion resistance and strength and toughness, and specific measures include: (1) controlling the bottom blowing mode and end point requirement in the converter process; (2) controlling the tapping time and replacing the tapping hole opportunity in the tapping process; (3) feeding the CAS aluminum wire and controlling the CAS argon blowing time; (4) controlling the top slag addition amount, heating time and outgoing mode in the LF refining process; (5) controlling the wire feeding parameters, soft blowing time and outgoing requirement of RH in the RH refining process; (6) controlling the precision requirement, casting speed fluctuation and crystallizer liquid level fluctuation of the continuous casting equipment in the continuous casting process to obtain the casting blank. Through controlling the parameters of each process in the smelting and rolling process, the present application realizes the whole-process steel cleanliness control and ladle grain refinement, and further improves the strength, low-temperature toughness, HIC resistance and carbon dioxide corrosion resistance of the large-wall-thickness pipeline steel.

The invention discloses 750MPa-grade low-stress hot-rolled high-strength beam steel and a manufacturing method thereof, the method comprises the steps of smelting and continuous casting, casting blank slow cooling and soaking, rolling and segmented cooling, in the casting blank slow cooling and soaking step, the casting blank is cooled in air after red delivery, the furnace entering temperature is 300 DEG C or above, the soaking temperature is 1250-1290 DEG C, and the furnace staying time is 1-1.2 mm / min; in the rolling step, the initial rolling temperature of rough rolling ranges from 1100 DEG C to 1150 DEG C, the accumulated deformation of rough rolling is larger than or equal to 70%, the initial rolling temperature of finish rolling ranges from 950 DEG C to 1080 DEG C, and the final rolling temperature of finish rolling ranges from 810 DEG C to 880 DEG C; in the subsection cooling step, the first section is subjected to water cooling to 710-780 DEG C at the cooling speed of 10-25 DEG C / s and then is subjected to air cooling for 4-8 s, and then the second section is subjected to water cooling to the coiling temperature of 550-620 DEG C at the cooling speed of 30-50 DEG C / s. According to the low-stress hot-rolled high-strength large beam steel, the yield strength is larger than or equal to 700 MPa, the tensile strength is larger than or equal to 750 MPa, the ductility is larger than or equal to 20%, and the low-stress hot-rolled high-strength large beam steel not only has high strength, but also has good toughness and formability, and completely meets the requirements for use and performance of large beam steel in the industries of automobile manufacturing, engineering machinery and the like.

The invention discloses high-grade non-oriented silicon steel and a preparation method thereof, and relates to the technical field of non-oriented silicon steel. The high-grade non-oriented silicon steel comprises the following components in percentage by weight: less than or equal to 0.002% of C, 3.0-3.6% of Si, 0.15-0.25% of Mn, 0.05-0.20% of Als, less than or equal to 0.001% of S, less than or equal to 0.015% of P, less than or equal to 0.0015% of N, less than or equal to 0.002% of Ti and the balance of Fe and inevitable impurities. The manufacturing method of the high-grade non-oriented silicon steel in the claim 1 sequentially comprises the following steps of converter smelting, RH refining, continuous casting, heating, hot rolling, coiling, normalizing, acid pickling, cold rolling, annealing and coating. Wherein the heating temperature is controlled to be 1110 DEG C to 1200 DEG C; the hot rolling comprises rough rolling and finish rolling, and the hot rolling temperature is controlled to be 900-1000 DEG C; the coiling temperature ranges from 550 DEG C to 600 DEG C; the normalizing temperature ranges from 850 DEG C to 970 DEG C; the total reduction rate of cold rolling is 80-87%; and the annealing temperature ranges from 840 DEG C to 960 DEG C. According to the invention, through precise control of chemical components and a two-stage annealing process, collaborative improvement of low iron loss and high magnetic induction is realized.

The invention relates to a high-quality non-quenched and tempered steel rectangular bloom for a crankshaft and a preparation method of the high-quality non-quenched and tempered steel rectangular bloom, and belongs to the technical field of non-quenched and tempered steel preparation. In order to improve the purity of molten steel for continuous casting and solve the problems of surface crack, composition segregation and uneven structure of the rectangular bloom of the steel for the non-quenched and tempered crankshaft, the invention provides a preparation method of the rectangular bloom of the steel for the high-quality non-quenched and tempered crankshaft, and the preparation method comprises the process steps of converter / electric furnace smelting, LF refining, VD / RH vacuum treatment and continuous casting. According to the method, the size and shape of the inclusions are controlled by taking strong deoxidation, uniform stirring, slag system refining and soft blowing time as the core, the fusiform MnS-shaped inclusions are obtained, and the cutting performance and the overall mechanical performance of the steel are remarkably improved. According to the method, continuous casting is carried out in a weak cooling and slow drawing mode, the surface of a casting blank is controlled to crack smoothly, the homogenization and the internal quality of the casting blank are improved, the quality of the non-quenched and tempered steel for the crankshaft is obviously improved, and a good base material is provided for rolling the crankshaft.

The invention belongs to the technical field of acrylic plates, and particularly relates to a continuous casting high-hardness acrylic plate and a preparation method thereof.The preparation method comprises the steps that siloxane modified methacrylic acid, methyl methacrylate and n-butyl methacrylate are mixed, an azo initiator is added into the mixture, and then stirring and mixing are conducted to obtain pre-polymerized slurry; the preparation method comprises the following steps: mixing hydroxyl-terminated ether polysiloxane, isophorone diisocyanate and a catalyst dibutyltin dilaurate, reacting to obtain a macromolecular prepolymer, and then adding an end-capping reagent and a photoinitiator into the macromolecular prepolymer to obtain coating slurry; and injecting the pre-polymerized slurry between two annular steel belts which operate synchronously, coating the two annular steel belts with the coating slurry, and carrying out ultraviolet curing to obtain the high-hardness acrylic plate. Through ultraviolet curing, a high-hardness layer is formed outside the acrylic plate, polyurethane is modified by hydroxyl-terminated ether polysiloxane, the rigidity of a soft chain segment is improved by a polysiloxane chain segment, and the hardness of polyurethane is improved.

The invention belongs to the technical field of steel production, and relates to a method for producing a low-cost high-strength galvanized sheet based on thin-strip cast rolling. After molten steel is subjected to thin-strip continuous casting to obtain a casting strip, the casting strip is rolled into a thin strip in a single pass mode, the thin strip is coiled after being cooled through aerial fog, then hot-dip galvanizing is conducted on a continuous hot-dip galvanizing production line after acid pickling is conducted, the annealing temperature of a galvanizing section is 640-720 DEG C, and then the thin strip is placed at the room temperature for more than 35 days after leveling is conducted. According to the method, supersaturated solid solution of C and N atoms in the thin strip casting and rolling sub-rapid solidification process is fully utilized, the high solid solution state is maintained by combining hot rolling and galvanizing section short-time and low-temperature design, finally, strength jump is driven by means of natural aging after production, and the high-strength galvanized plate with good stamping performance is obtained under a simple C-Si-Mn component system. The problems that the high-strength galvanized plate forming capacity of a traditional high-carbon route is insufficient, and the alloy cost of a low-carbon microalloy route is high are solved, and meanwhile carbon emission in the product production process is greatly reduced.

The invention belongs to the technical field of metallurgical continuous casting equipment, and particularly relates to a pulling plate type free adjusting mechanism of a crystallizer foot roller, which comprises a lower flange, a plurality of groups of foot roller frames are fixed on the lower flange, and guide grooves are arranged on opposite sides of two adjacent groups of foot roller frames. The roller gap value is rapidly and accurately adjusted by rotating the pulling plate adjusting bolt, different production requirements are met, the production efficiency is improved, the foot roller can be continuously used through adjustment when the foot roller is slightly abraded, the replacement amount of the foot roller is reduced, the service life of the foot roller is prolonged, the cost is reduced, the use efficiency of equipment is improved, and the pulling plate can be pulled out. The roller assembly is convenient to adjust and replace, the workload of disassembling parts during overhauling is reduced, manpower and material resources are saved, the equipment maintenance cost is reduced, the downtime is shortened, meanwhile, the overall structural design is beneficial to precise control over roller gaps, safe use of equipment is guaranteed, and then the casting blank quality is improved.

The invention relates to the technical field of thin-strip continuous casting production, in particular to a method for automatically controlling the height of a molten pool in the double-roller thin-strip continuous casting production process, which comprises the following steps: arranging a laser ranging module and a visual perception module; processing by an embedded processing module; establishing a molten pool height dynamic prediction model by adopting a deep learning algorithm, and outputting a molten pool height prediction value; self-adaptive sliding mode control is adopted as a main controller, and the displacement amount of the servo hydraulic stopper rod is output; and controlling the height of the molten pool based on the displacement of the servo hydraulic stopper rod. According to the method, laser is used for providing accurate distance reference, visual sensing is used for providing molten pool liquid level information, and the detection precision is improved and environmental interference is reduced through a machine vision algorithm; based on the process parameters and the real-time information of the sensor, constructing a molten pool height prediction model by using a neural network algorithm with physical constraints; and a reinforcement learning optimizer is added to adjust sliding-mode control parameters online, so that the sliding-mode control parameters adapt to working condition changes to carry out high-precision and fast-reaction molten pool height control.

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.