150 results about "Steelmaking continuous casting" patented technology

The invention relates to a steel production-oriented multi-base multi-production-line multi-process global plan optimization method and system. The method comprises the following steps of: receiving and standardizing order demand data; executing hierarchical processing and distribution of multi-base orders, and outputting a base-level order set; deducting and marking the net production demand quantity of the base-level orders; executing multi-production-line order allocation in a single base, and generating a production line level order set; performing cross-process collaborative batch grouping on the production line level order set based on steel making-continuous casting-rolling-post-processing process constraints to generate a cross-process batch plan; constructing a global evaluation model, performing comprehensive evaluation on an intermediate result, and generating a parameter correction instruction based on an evaluation result for adjusting parameters, constraints or distribution strategies of subsequent modules; and finally, generating a production plan scheme with consistent cross-base, cross-production-line and cross-process, and triggering rolling optimization update when disturbance occurs. According to the invention, unified coordination and global optimization of multi-module plan results are realized.

The invention discloses a novel quick-change mechanism with a flow control function for a tundish. The novel quick-change mechanism comprises a mounting part, a sliding part, a pressing part, a first driving part and a second driving part. And the functions of the stopper rod opening and closing device are integrated on the tundish quick-change nozzle device, so that the investment, the installation site, the maintenance cost, the spare part site and the cost of a set of equipment are saved. The two sets of equipment are combined into a whole, so that the number of operators in a steel mill is reduced, and meanwhile, preparation is made in advance for the subsequent steel mill if intelligent and automatic control over steel-making continuous casting is adopted, and the positive effect is achieved.

The invention provides a method and device for determining steelmaking-continuous casting production multi-process collaborative demand response, and relates to the technical field of manufacturing, and the method comprises the steps that target parameters in the steelmaking-continuous casting production process are obtained; based on a production plan, each work starting moment, each work ending moment, each unit energy consumption and time-of-use electricity prices of different time periods included in the target parameters, by taking the minimum energy cost and the minimum waiting duration as targets and based on an MILP method, establishing a heat coordinated optimization material flow mathematical model in the steelmaking-continuous casting production process and solving the heat coordinated optimization material flow mathematical model; and a coordinated optimization demand response strategy is obtained. According to the method, the coordinated optimization demand response strategy in the steelmaking-continuous casting production process is quickly obtained by solving the heat coordinated optimization material flow mathematical model, so that the determination efficiency of the heat distribution strategy is improved, the internal flexibility adjustment potential of iron and steel enterprises can be mined by the obtained coordinated optimization demand response strategy, and the economic benefit of the enterprises is improved. And friendly interaction between iron and steel enterprises and a power grid is promoted.

The invention relates to the technical field of steelmaking continuous casting, in particular to a continuous casting slab longitudinal crack real-time prediction method based on deep learning, which comprises the following steps: data acquisition and preprocessing: acquiring continuous temperature time sequence data on a plurality of rows of thermocouples of a crystallizer copper plate; a hybrid neural network model is constructed, an input layer is used for receiving L * N-dimensional temperature time sequence data, L is a time window length, N is a crystallizer thermocouple number, a feature extraction module comprises a multi-scale feature extraction module and a feature interaction bidirectional LSTM layer, and a classification module constructs a network structure of a full connection layer, a Dropout layer and an output layer; according to the method, online prediction of slab longitudinal cracks is realized, deep features of temperature time sequence data are automatically learned through an end-to-end model, and prediction precision and real-time performance are remarkably improved in combination with a hybrid neural network architecture.

The utility model relates to the field of steelmaking continuous casting equipment, in particular to a large round billet continuous casting machine cold start throwing connecting device which comprises an annular cover, the annular cover is formed by welding steel bars, the rear end of the annular cover is connected with an end cover, the end cover is formed by welding steel bars, and an L-shaped connecting frame is welded to the front end of the annular cover. And a baffle plate corresponding to the L-shaped connecting frame is arranged on the annular cover. As a filling aggregate for the hook head part of the end part of the casting blank, the filling aggregate has the effect of quickly reducing the casting blank temperature of the hook head part of the end part of the casting blank, improves the mechanical strength of the hook head part of the end part of the casting blank, ensures reliable connection, ensures successful cold start of a continuous casting machine, reduces cold start accidents, improves the operation rate of the continuous casting machine and reduces the cost of a continuous casting process.

The invention relates to an easy-to-form corrosion-resistant and wear-resistant steel plate for a conveying pipeline and a manufacturing method thereof, and belongs to the field of pipeline steel. The surface Brinell hardness of the wear-resistant steel plate is 370-430 HB, the ductility is larger than or equal to 10%, the Charpy V-shaped impact energy at the temperature of-40 DEG C is larger than or equal to 30 J, d is equal to 4 t, and no crack exists after 180-degree cold bending; the martensite structure is uniform and fine, the grain size is larger than or equal to 7 grades, and the total grade of A, B, C and D fine inclusions in the structure is smaller than or equal to 2.0. And under the working condition that the pH value is 6.0-8.5, the corrosion resistance of the steel can be improved by 40% or above compared with that of Q355 structural steel. A high-cleanliness steelmaking continuous casting process, plate blank hydrogen diffusion, two-stage controlled rolling, high-temperature normalizing pretreatment, off-line quenching and tempering are adopted, control is conducted from the aspects of chemical component design, base metal structure and the like, and the low-temperature toughness, formability, corrosion resistance and weldability of the wear-resistant steel plate for the conveying pipeline are guaranteed; and a solution is provided for the application of the long-service-life wear-resistant pipeline.

The application discloses a non-oriented silicon steel for a fixed-frequency compressor motor core and a preparation method thereof. The preparation method comprises the following steps: steelmaking, continuous casting, and the chemical composition of the continuous casting blank is as follows in terms of mass percentage: Si: 0.7%-1.0%, Al: 0.42%-0.60%, Si / Al=1.5-1.7, Mn: 0.1%-0.3%, Nb<=0.005%, V and Ti are all <=0.006%, Cr and Ni and Cu are all <=0.03%, and the rest is Fe; the continuous casting blank is heated to 1050-1100 DEG C and kept for 180+ / -30 min, rough rolling, finish rolling and coiling; the finish rolling opening rolling temperature is 880-910 DEG C, the outlet temperature is 800-820 DEG C, and the coiling temperature is 600-620 DEG C; acid continuous rolling is carried out to prepare a cold-rolled plate with a thickness of 0.500+ / -0.005 mm; and annealing is carried out at an annealing temperature of 880-920 DEG C for an annealing time of 70s+ / -10s.

The utility model provides a connecting device for a movable tool apron and a shearing oil cylinder of a hydraulic shearing machine and the shearing machine, and belongs to the technical field of steelmaking continuous casting equipment. The top end of the connector is sleeved with a first thrust knuckle bearing, and the upper portion of the first thrust knuckle bearing is arranged in a counter bore of the movable tool apron; a first fixed connecting part is arranged at the bottom end of the connector and is connected to a piston rod of the shearing hydraulic cylinder; a step through hole is formed in the connector; the pull rod penetrates through the stepped through hole, the top end of the pull rod penetrates through the interior of the movable tool apron, and a second fixed connecting part is arranged on the pull rod and connected to the bottom of the movable tool apron; the lower portion of the pull rod is sequentially sleeved with a second thrust knuckle bearing, a pressing check ring and a fastening mechanism. By utilizing the utility model, the problem that the service life of the shearing hydraulic cylinder is influenced by the radial force on the piston rod of the hydraulic cylinder due to the shearing motion of the movable tool apron when the slideway is abraded or the assembly precision is not enough in the prior art can be solved.

The present invention relates to a dust removal duct installation structure for a steelmaking continuous casting plant, comprising a plurality of roof longitudinal beams, a plurality of roof transverse beams, a plurality of pipe supports, a transport bracket, a transverse push bracket, and the roof transverse beams are respectively installed between two adjacent roof longitudinal beams, and the roof longitudinal beams and the roof transverse beams are divided into a dust removal duct installation area and a dust removal duct grouping area; the pipe supports are fixedly installed on two adjacent roof longitudinal beams; the transport bracket is fixedly installed on the outer side surface of the pipe support at the outermost edge of the dust removal duct grouping area; the transverse push bracket is fixedly installed on two adjacent pipe supports in the dust removal duct grouping area; the present invention can quickly install the dust removal duct when the roof transverse beams have been installed, and the factory roof structure will not be unable to be closed in time due to the reserved factory roof beams not being installed, which seriously affects the construction period. At the same time, when the dust removal ducts on the continuous casting plant roof are replaced and repaired in the maintenance project, the roof transverse beams do not need to be removed, and the normal operation of the production crane in the factory will not be affected.

The utility model discloses a steelmaking continuous casting machine waste heat recycling device which comprises a conveying pipe and a heat exchanger, an annular blocking plate is arranged at the casting blank inlet end of the conveying pipe, a plurality of annular cavities are sequentially formed in the conveying pipe at intervals from the casting blank inlet end to the casting blank outlet end, and each annular cavity is connected with a cold air pipe. A plurality of air nozzles are uniformly distributed on the circumference of the side wall of the side, facing the annular blocking plate, of the annular cavity, cooling cavities are formed between the adjacent annular cavities and between the annular blocking plate and the annular cavities, a plurality of conveying rollers are arranged in the cooling cavities, an exhaust pipe is arranged on the side wall of the side, close to the annular blocking plate, of the cooling cavity, and a heat exchange pipe assembly is arranged in the heat exchanger. The exhaust pipe is communicated with an inlet of the heat exchange pipe assembly, a water supplementing opening is formed in the heat exchanger, an air compressor and a vortex tube which are communicated are arranged on the outer side of the conveying pipe, and a cold air outlet of the vortex tube is communicated with the cold air pipes. In conclusion, the casting device has the advantages of being small in heat loss, high in casting efficiency and high in heat recovery rate.

The invention provides a double-length cutting device and method for a continuous casting machine, and belongs to the technical field of steelmaking continuous casting equipment. The double-length cutting device of the continuous casting machine comprises a cutting unit, the cutting unit comprises a movable frame body, a primary flame cutting machine and a secondary flame cutting machine, the primary flame cutting machine and the secondary flame cutting machine are installed on the movable frame body, and the distance between the primary flame cutting machine and the secondary flame cutting machine can be adjusted in the running direction of a casting blank so that the double-length cutting requirement of the casting blank can be met; the multiple roller bed units are located below the cutting device, the multiple roller bed units are sequentially arranged at intervals in the casting direction, each roller bed unit is provided with a roller bed and an avoiding mechanism, the roller beds support the casting blanks, and the avoiding mechanisms drive the roller beds to move between the working position for bearing the casting blanks and the avoiding position for avoiding the cutting flame flow; and the synchronizing unit is arranged on the movable frame body, and the synchronizing unit controls the movable frame body to be synchronized with the moving casting blank. The equipment investment and workshop construction cost are greatly reduced, and the adaptability and economical efficiency of the continuous casting production line are enhanced.

The application provides a 500MPa-grade low-yield-ratio high-corrosion-resistance hot-dip galvanized low-density steel and a manufacturing method, and the steel plate composition is as follows in percentage by weight: C: 0.065%-0.073%, Si: 0.42%-0.54%, Mn: 1.51%-1.62%, Al: 3.3%-6.5%, P: <=0.010%, S: 0.01-0.03%, RE: 0.01%-0.015%, and the balance is Fe and inevitable impurities. The manufacturing method of the steel comprises the following steps: blast furnace molten iron pretreatment, converter steelmaking, continuous casting, hot continuous rolling, pickling, cold rolling, hot-dip galvanizing; and the steel organization structure is as follows: delta-ferrite + martensite + residual austenite + sulfide, wherein the martensite content is 5.2%-7.0%, the residual austenite content is 3.5%-3.8%, and the sulfide composition is a small amount of dispersedly distributed MnS and RE-S-O, a small amount of MnS is dispersedly precipitated in ferrite and martensite, and RE-S-O is distributed along the ferrite grain boundary.

The application discloses a continuous casting billet and red delivery system and method, and belongs to the field of steelmaking and continuous casting in steel production. In order to improve production efficiency, the continuous casting billet and red delivery system comprises a billet delivery roller way (1), the billet delivery direction of the billet delivery roller way (1) is a right-to-left direction, along the billet delivery direction of the billet delivery roller way (1), a first fire cutting machine (2), a second fire cutting machine (4), a slide rail (7) and a billet collecting device (8) are sequentially arranged on the billet delivery roller way (1), the slide rail (7) extends along the front-to-back direction, along the front-to-back direction, one end of the slide rail (7) is provided with a billet pushing machine (6), and the other end of the slide rail (7) is provided with the billet collecting device (8); the billet on the billet delivery roller way (1) can be transferred to the slide rail (7), and the billet pushing machine (6) can push the billet on the slide rail (7) into the billet collecting device (8). The continuous casting billet and red delivery system and method can directly produce short fixed-size billets in a continuous casting workshop, and improve the production efficiency of rolling.

The utility model relates to movable dust removal equipment for steel ladle hot repair, and belongs to the field of steelmaking continuous casting dust removal. The two guide rails and the two supporting bridges are fixedly arranged on the ground; the multiple hubs are arranged on the supporting bridge frame and connected to the guide rails in a rolling mode. The dust hood is mounted on the supporting bridge frame, and a bag type dust collector and a fan are mounted at the top of the dust hood; an air inlet pipe is fixedly arranged at an inlet of the bag type dust collector and is communicated to a dust collection cover opening of the dust collection cover; an outlet of the bag type dust collector is fixedly provided with an air outlet pipe, the air outlet pipe is communicated to a draught fan, the device travels to the position above a steel ladle to be subjected to hot repair, the dust removal mode is started before the steel ladle is subjected to hot repair, and by means of the sealing characteristic of the dust removal device, excessive wild wind suction is avoided, and dust overflow is avoided. When the steel ladle is subjected to hot repair, the fan is started; and when no task exists, the fan operates at low frequency or stops, so that the operation cost can be greatly saved, and considerable social benefits are achieved.

The invention discloses automatic constant-temperature reciprocating rolling equipment and process for a titanium alloy bar cogging mill, and belongs to the technical field of steelmaking continuous casting and rolling. The equipment comprises two rotatable movable metal detector devices, a feeding induction heating system and a discharging induction heating system, wherein the two rotatable moving type metal detector devices are oppositely arranged on the left side and the right side of a roller respectively, the feeding induction heating system is arranged on the front side of the feeding conveying roller way, and the discharging induction heating system is arranged on the front side of the discharging conveying roller way. By means of the rotatable movable metal detector device, the detection precision is improved, the device adapts to the production rhythm of a cogging mill, the steel throwing position can be controlled to be close to a roller as far as possible, the rolling efficiency is improved, the titanium blank temperature loss in the rolling process is reduced, and meanwhile the manual operation risk is reduced. In addition, the situation that the temperature of the head and the tail of the blank is not uniform is improved through the induction heating system, and therefore the temperature is kept constant in the whole rolling process.

The invention belongs to the technical field of steelmaking and continuous casting, and particularly relates to a system and method for remotely controlling accident water through a continuous casting machine by applying PID. The system comprises a first connecting pipe, a machine cooling pump, an accident water tank, an accident water inlet pipe, an accident water return pipe, a second connecting pipe and a PID control unit. A water return port of the continuous casting machine is connected with one end of the machine cooling pump through a first connecting pipe, and the other end of the machine cooling pump is connected with a water inlet of the continuous casting machine through a second connecting pipe. The accident water tank is connected with the second connecting pipe through an accident water inlet pipe; the PID control unit comprises an accident water return valve control unit and a PIC control unit; the accident water return valve control unit is arranged on the accident water return pipe; the PIC control unit is connected with the first connecting pipe; and the accident water return valve control unit is connected with the PIC control unit. Based on the system and the method, the problems that a traditional accident water control method is large in error, insufficient in reliability, weak in anti-interference capacity and high in maintenance cost can be solved.

The utility model discloses a multi-channel environment-friendly dust removal device, which relates to the dust removal field in the steelmaking continuous casting field and comprises three bag-type dust removers, bottom end inlets of the three bag-type dust removers are all connected with input pipes, top end outlets of the three bag-type dust removers are all connected with output pipes, and the output pipes are connected with the three bag-type dust removers. The input ends of the three input pipes are connected with a first draught fan, a second draught fan and a third draught fan correspondingly, the input ends of the first draught fan, the second draught fan and the third draught fan are all connected with connecting pipes, and the input ends of the three connecting pipes are all connected with four-way pipes. By arranging the first pipeline connecting mechanism and the second pipeline connecting mechanism, mutual parallel connection of a plurality of workshop dust removal systems is achieved, when a certain workshop is in a low-frequency production state, the corresponding draught fan can be closed, dust removal is assisted through other draught fans, and when a certain draught fan is damaged, the other draught fans can be closed. And the situation that dust and impurities cannot be removed in time, and consequently the bodies of workers are injured can be avoided in an auxiliary dust removal mode.

The utility model discloses a continuous casting production line, and belongs to the technical field of steelmaking continuous casting. The continuous casting production line comprises a cutting roller way, a continuous casting trench, a casting blank cutting trolley, a guide sliding piece and a slag receiving hopper. The cutting roller way is used for conveying casting blanks; the continuous casting trench is arranged below the cutting roller way in the length direction of the cutting roller way. The casting blank cutting vehicle is used for cutting casting blanks and can move in the length direction of the cutting roller way. The sliding guide piece is arranged below the roller way and provided with a chute which is inclined relative to the horizontal plane, and at least part of the chute is located below the movement path of the casting blank cutting trolley; the slag receiving hopper is placed in the continuous casting trench, the slag receiving hopper is provided with a slag receiving groove, and an opening of the slag receiving groove is located below a slag outlet of the chute and used for receiving slag discharged from the slag outlet of the chute.

The present application relates to the technical field of steelmaking continuous casting, and particularly relates to a method for adjusting the length of square billets, which comprises the following steps: defining the hot billet density, the theoretical cross-sectional area of the billet and the theoretical standard weight of the billet; obtaining the actual weight of the billet by weighing; obtaining the actual length of the billet by measuring the hot billet; calculating the adjustment amount of the billet and the weight difference ratio according to the theoretical standard weight of the billet and the actual weight of the billet; and calculating the length of the next billet according to the correction coefficient, the adjustment amount of the billet and the actual length of the previous billet. The present application realizes the purpose of controlling the weight difference of the billet within 3‰.

The invention relates to an automatic casting grid type dummy ingot frame of a large-section continuous casting machine and a preparation method, and belongs to the technical field of steelmaking continuous casting processes in the metallurgical industry. According to the technical scheme, the grid type dummy ingot frame is formed by welding phi 14-phi 16 steel bars, a plurality of transverse bars (3) and longitudinal bars (4) are arranged in a rectangular frame (1) and divide the rectangular frame (1) into a middle gap (6) and a plurality of peripheral gaps (7), the width of the peripheral gaps (7) is matched with the size of the section of a cold material, the middle gap (6) is an inlet of molten steel, and the longitudinal bars (4) are arranged in the rectangular frame (1). And the size ensures that molten steel can be poured into the dummy bar head. The method has the beneficial effects that the number and the shape of the added reinforcing steel bars needed by casting of the large-section continuous casting machine can be guaranteed, meanwhile, the inner wall of a copper pipe is prevented from being scratched, all defects of preparation work before casting of the continuous casting machine are overcome, and the casting success rate is increased.

The invention discloses a method for improving the success rate of one-time flame cleaning of a continuous casting slab, and belongs to the field of steelmaking continuous casting. The method comprises the steps that a special stack position is arranged in a reservoir area for a continuous casting slab needing to be subjected to flame cleaning, scrapped cushion blanks with the width larger than or equal to 1.7 m and the deformation quantity smaller than or equal to 2 mm are laid on the stack position in a longitudinal full laying mode, and the overall levelness of the slab to be cleaned is controlled to be smaller than or equal to 10 mm after the slab to be cleaned is placed; the program linkage logic of the flame cleaning machine is optimized, the detection time of a roller way steel clamping capturing signal is prolonged from 0.5 second to 1 second, the first-order oxygen pressure linkage is changed from the operation condition to the starting condition, and meanwhile the downstream pressure low linkage threshold value of an oxygen main pipe valve is adjusted from 10.5 kg / cm < 2 > to 9.5 kg / cm < 2 >. According to the method, through multi-dimensional collaborative optimization from blank preparation, equipment control, energy guarantee to process monitoring, the one-time success rate and operation stability of flame cleaning of the continuous casting sheet billet are remarkably improved.

The utility model relates to the technical field of steelmaking continuous casting equipment, and provides a square billet continuous casting machine spraying device with a collecting mechanism, which comprises a continuous casting machine assembly, the continuous casting machine assembly comprises a base, a first support, a guide rail, a square billet body, a side baffle plate, a front baffle plate, a first liquid discharge pipe and a second liquid discharge pipe, a first support is fixed to the top end of the base at one end of the guide rail, and a front baffle is fixed to the side, away from the first support, of the top end of the base. By arranging the collecting structure, sprayed sewage enters the two sides of the interior of the collecting box through the first liquid discharging pipe and the second liquid discharging pipe, the first filtering layer is used for first-step filtering, fine impurities in the sewage are intercepted, the second filtering layer is used for second-step filtering, and harmful substances in the sewage are treated; the spraying device of the square billet continuous casting machine has the functions of collecting the spraying liquid and treating the spraying liquid, and the convenience and applicability of the spraying device of the square billet continuous casting machine in use are improved.

The invention discloses a continuous casting rhythm dynamic control method, and relates to the technical field of steelmaking production scheduling, and the method comprises the following steps: querying an unfinished heat of a casting time according to a smelting state, calculating the predicted casting time length of the uncast heat according to a typical pulling speed, and calculating the casting time length of the uncast heat; according to the actual time of the working procedure, the starting and ending time of the heat planned casting is positively calculated in sequence; presetting starting and ending time and stations of other procedures by referring to a steelmaking manufacturing standard and steel ladle transfer time and combining the starting and ending time of heat planned casting to form an initial scheduling scheme; defining a scheduling scheme evaluation function calculation rule and a scheduling scheme adjacent scheme generation mode; optimizing the initial scheduling scheme to generate a final scheduling scheme; and generating a continuous casting rhythm decision prompt according to the final scheduling scheme. Based on steelmaking-continuous casting whole process information, continuous casting rhythm adjustment suggestions and early warning are generated, the quality of finished products is controlled, the production rhythm is stabilized, and accident abnormity is reduced.

The present application relates to the technical field of steelmaking-continuous casting, and particularly discloses a production scheduling method for short-process steelmaking-continuous casting considering shared energy storage, comprising the following steps: determining the total power consumption cost of the entire scheduling period based on the cost of purchasing electricity from an external power grid and the cost of purchasing electricity from shared energy storage; determining the total processing power variance of the entire scheduling period based on the total processing power of all processing machines at each time of the scheduling period; determining the difference degree of the external power supply power and the renewable energy power generation of the entire scheduling period based on the external power supply power and the renewable energy power generation at each time of the scheduling period; constructing a multi-objective production scheduling model for short-process steelmaking-continuous casting considering shared energy storage by taking the minimum total power consumption cost, total processing power variance and difference degree as targets, and solving the model to obtain the total scheduling decision of short-process steelmaking-continuous casting. The present application is conducive to realizing green-economical-balance production scheduling of short-process steelmaking-continuous casting.

The invention provides 450MPa-grade hot-dip galvanized low-density steel with low yield ratio and high corrosion resistance and a manufacturing method thereof. A steel plate comprises the following components in percentage by weight: 0.04%-0.06% of C, 0.25%-0.4% of Si, 1.4%-1.5% of Mn, 3.3%-6.5% of Al, less than or equal to 0.010% of P, 0.01%-0.03% of S, 0.01%-0.015% of RE and the balance of Fe and inevitable impurities. The manufacturing method of the steel comprises the steps of blast furnace molten iron pretreatment, converter steelmaking, continuous casting, hot continuous rolling, acid pickling, cold rolling and hot galvanizing. The steel structure is delta-ferrite, alpha-ferrite, martensite, retained austenite and sulfide, the content of the martensite is 3.5-5%, the sulfide is composed of a small amount of MnS and RE-S-O which are distributed in a dispersed mode, the small amount of MnS is separated out in the ferrite and the martensite in a dispersed mode, and the RE-S-O is distributed along the ferrite grain boundary.

The application provides a 780MPa-grade low-yield-ratio high-corrosion-resistance hot-dip galvanizing low-density steel and a manufacturing method, and the steel plate composition is as follows in percentage by weight: C: 0.12%-0.17%, Si: 0.59%-0.72%, Mn: 1.71%-1.89%, Al: 3.3%-6.5%, P: ≤0.010%, S: 0.01%-0.025%, RE: 0.01%-0.012%, and the balance is Fe and inevitable impurities. The manufacturing method of the steel comprises the following steps: blast furnace molten iron pretreatment, converter steelmaking, continuous casting, hot continuous rolling, pickling, cold rolling and hot-dip galvanizing.

The application discloses a raw material pure iron steel coil for powder metallurgy and a production method thereof. The raw material pure iron steel coil comprises the following chemical components in percentage by weight: C<=0.0015%; Si<=0.005%; Mn<=0.020%; P<=0.008%; Als<=0.015%; S<=0.005%; Cr<=0.010%; Ni<=0.010%; Cu<=0.008%; Ti<=0.005%; [O]<=0.004%; N<=0.005%; and the rest is Fe and inevitable inclusions. The raw material pure iron steel coil is produced by adopting the production method of steelmaking+continuous casting+hot continuous rolling+cross cutting, has very low strength, high elongation and high purity, and can be used in powder metallurgy. The production method has high production efficiency, high material yield, short delivery cycle, can greatly reduce the production process cost and improve the material yield of users.

The application provides a method for controlling V-shaped segregation of square billet by using a traveling wave linear electromagnetic stirrer, and relates to the technical field of steelmaking-continuous casting. The method sets a traveling wave linear electromagnetic stirrer at the solidification end of a square billet continuous casting machine; then a numerical simulation prediction model of the end linear electromagnetic stirring and continuous casting billet solidification growth is constructed by an electromagnetic field calculation model of the end traveling wave linear electromagnetic stirrer and a continuous casting multiphase solidification physical model; the strength of the end linear electromagnetic stirring is determined by solving the electromagnetic field calculation model; the time t0 value when the slip velocity of equiaxed crystals at the installation position of the electromagnetic stirrer at the solidification end is 0 m / s is obtained by solving the continuous casting multiphase solidification physical model, and then the distance between the center of the end electromagnetic stirrer and the meniscus is calculated, so that the installation position of the electromagnetic stirrer is determined; finally, the shell thickness of the solidification end casting billet is calculated, so as to guide the elimination of V-shaped segregation in the field production and maximize the improvement of the internal quality defects of the continuous casting billet.

The present application relates to the technical field of metal smelting, and particularly discloses a ladle circulation method of a continuous casting machine and a continuous casting production process to solve the problem of low ladle circulation rate in steelmaking-continuous casting production. The ladle circulation method of the continuous casting machine comprises: one of two continuous casting machines is operated with all casting flows opened, and the other is operated with part of the casting flows opened; the number of ladles corresponding to the two continuous casting machines respectively is determined according to the single-ladle casting cycle required by the two continuous casting machines respectively and the total circulation time of the ladles from tapping of the corresponding converter to casting of the continuous casting machine, and the number of ladles corresponding to the two continuous casting machines respectively is summed up to obtain the total number of ladles. The ladle circulation method has the beneficial effect of reducing the number of ladles, improving the ladle circulation rate, thereby reducing the tapping temperature of the converter, saving the energy consumption in the steelmaking process and the consumption of ladle baking gas. The present application also discloses a continuous casting production process adopting the ladle circulation method of the continuous casting machine, which also has the above technical effects.

This invention relates to a multi-strand online width adjustment method for continuous casting machines with multiple steel grades, belonging to the technical field of continuous casting casting schedule development in steelmaking. The method involves clustering the heats to be produced into Lots based on steel grade and target width. All Lots are rearranged using a sorting model to generate a Lot sequence that minimizes the total number of tundishes used, the number of mixed steel grades, and the order width adjustment cost during continuous casting. Subsequently, based on a two-stage width optimization model, the target widths of different Lots are adjusted to the allowable width adjustment range of the continuous casting machine, and Lots that meet the continuous casting conditions are merged into casting segments. Finally, based on tundish life constraints, the generated casting segments are cut to generate a complete casting plan, clarifying the affiliation of each heat, ultimately producing a complete and feasible casting schedule. Since the width still meets the order requirements, the matching degree between slabs and orders can be significantly improved, reducing order cancellations caused by specification incompatibility.