30results about How to "Improve billet quality" patented technology

The invention discloses lanthanum-cerium mixed rare earth corrosion-resistant twisted steel with yield strength of 400MPa. The lanthanum-cerium mixed rare earth corrosion-resistant twisted steel comprises the following elements: 0.10 to 0.20 percent of C, 0.25 to 0.80 percent of Si, 0.90 to 1.60 percent of Mn, 0.020 to 0.045 percent of V, 0.003 to 0.010 percent of Ti, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, 0.25 to 0.65 percent of Ni, 0.25 to 0.70 percent of Cr, 0.10 to 0.18 percent of RE, less than or equal to 0.20 percent of Cu, less than or equal to 0.004 percent of O, less than or equal to 0.006 percent of N and the balance of Fe and inevitable impurities. The invention further discloses a production method of the lanthanum-cerium mixed rare earth corrosion-resistant twisted steel with the yield strength being 400 MPa. The production method comprises the working procedures of converter smelting, argon blowing refining, LF furnace refining, continuous casting and rolling, and the lanthanum-cerium mixed rare earth reinforced alloy cored wire and the silicon-calcium wire are fed into molten steel in the argon blowing refining process. The components, inclusions and mechanical properties of the produced 400 MPa-grade lanthanum-cerium mixed rare earth steel bar completely meet the technical requirements of the steel bar, the quality control requirement is met, and the 400 MPa-grade lanthanum-cerium mixed rare earth steel bar has the advantages of being high in strength, high in plasticity, resistant to corrosion and the like. The service life of the steel is prolonged, coating and galvanization are avoided, the burden of environmental protection is relieved, and reasonable application of resources is facilitated.

The invention belongs to the technical field of metallurgical continuous casting, and particularly relates to a nodulation and blockage prevention method suitable for a built-in water gap and a thin-wall water gap, a high-temperature-resistant stainless steel hoop is nested on the outer wall of the water gap during production of the water gap, and a high-temperature-resistant movable steel hoop with an adjustable support is matched with the high-temperature-resistant stainless steel hoop; during continuous casting field production, the high-temperature-resistant movable steel hoop is fixed above the crystallizer by the adjustable support on the high-temperature-resistant movable steel hoop; after the continuous casting platform is in place, the high-temperature-resistant movable steel hoop is clamped on the high-temperature-resistant stainless steel hoop of the water gap; conductive fire clay is coated between the high-temperature-resistant movable steel hoop and the high-temperature-resistant stainless steel hoop on the water gap; and connecting a lead, applying a positive electric field to the submersed nozzle, and applying a negative electric field to the tundish external electrode. The problem of nodulation and blockage of the water gap is effectively solved, the liquid level fluctuation qualification rate of the crystallizer is increased, large inclusions in a casting blank are reduced, and the quality of the casting blank is improved.

The invention discloses a preparation method of an HPB300 continuous casting billet. The production process of the preparation method of the HPB300 continuous casting billet comprises the steps of converter smelting, argon station treatment and square billet continuous casting, the end point carbon content is controlled in the converter smelting process, the argon blowing time, the sulfur content and the manganese content of molten steel are controlled in the argon station treatment process, and continuous casting of the square billet is achieved. And the crystallizer working condition, the pouring superheat degree, the secondary cooling water distribution amount and the pulling speed are controlled in the square billet continuous casting process, so that the quality of the HPB300 continuous casting billet is improved. By optimizing the process in the converter smelting, argon station treatment and continuous casting processes, the problem of casting blank separation is effectively solved, and the defect of internal cracks of the casting blank is reduced.

This invention discloses a novel bulletproof steel plate with a thickness of 12-35mm, comprising the following chemical composition by weight percentage (unit: wt%): C: 0.25-0.28, Si: 1.20-1.40, Mn: 1.50-1.60, P: ≤0.007, S: ≤0.001, Cr: 0.50-0.60, B: 0.0015-0.0023, Ti: 0.03-0.04, with the remainder being Fe and residual elements; it eliminates the need for the addition of Ni, Mo, and rare earth elements, thus reducing alloy costs. In terms of production process, clean steel smelting is used to control the P and S content, thereby improving impact toughness; pressure quenching is employed with multi-point pressure application and reasonable distribution of water volume and pressure in each section of the high-pressure zone to achieve uniform cooling and flatness of the steel plate; furthermore, low-temperature tempering is used to effectively eliminate the influence of residual internal stress in the steel plate and improve the subsequent processing performance of the steel plate, such as cutting and welding. The resulting bulletproof steel has a tensile strength of 1700-1800MPa, a surface hardness of >500HBW, and an impact energy of >40J at -20℃, which fully meets the requirements for use of bulletproof steel plates.

The invention relates to the technical field of ferrous metallurgy, and discloses a method for predicting precipitation of TiN inclusions in a casting blank and a casting blank production process, the method comprises the following steps: S1, collecting steel grade components; s2, calculating the activity of Ti and N in the molten steel; s3, calculating the precipitation thermodynamic condition of the TiN inclusion in the molten steel according to the calculated activity of Ti and N in the molten steel; s4, the calculated precipitation thermodynamic condition of the TiN inclusion in the molten steel is compared with the liquidus temperature of the steel grade, and whether the TiN inclusion can be precipitated in the molten steel or not is judged; and S5, an inequality equation of the actual concentration product of nitrogen and titanium in the solid-liquid two-phase region in the molten steel solidification process and the equilibrium concentration product on the liquidus temperature is established, and whether TiN inclusions can be separated out of a casting blank obtained through molten steel solidification or not is judged. According to the method, the Ti and N contents in molten steel are associated with the solid fraction by considering the segregation problem according to the Ti and N content control requirements of the steel grade, and whether TiN inclusions are generated in a casting blank in the solidification process or not is predicted.

The invention relates to an optimization design method for slab continuous casting crystallizer vibration process parameters, and belongs to the field of slab continuous casting. The design purpose of the invention is to improve the slab quality and smooth proceeding of the continuous casting process. According to the method, the optimization target is set through theoretical calculation, multi-parameter planning solution is executed, and the optimization value of the vibration process parameters is obtained. And the pulling speed set value is adjusted, the solving step is repeated, and the vibration process synchronous control model is formed. According to the scheme, the metallurgical process requirements and the limitation of the capacity of vibration equipment are comprehensively considered, so that the rationality and reliability of vibration parameter design are improved. By introducing more metallurgical process demand elements, the method can ensure the rationality of each key metallurgical parameter in all directions, and provides technical guarantee for high-quality continuous casting production.

The present application relates to the field of aluminum liquid temperature control, and specifically to an aluminum liquid temperature control device and an aluminum liquid temperature control method. The aluminum liquid temperature control device includes a filter box, a flow trough and a front box, the filter box is used to filter the aluminum liquid degassed by the degassing box, the flow trough is used to introduce the aluminum liquid filtered by the filter box into the front box, and the front box is used to output the aluminum liquid for casting and rolling. The aluminum liquid temperature control device also includes a temperature control mechanism, and the temperature control mechanism includes a first temperature measuring structure and a heating structure. The first temperature measuring structure is arranged in the front box, and is used to measure the temperature of the aluminum liquid in the front box. The heating structure is partially arranged in the filter box, and is used to heat the aluminum liquid in the filter box. The first temperature measuring structure is electrically connected to the heating structure. By directly monitoring the temperature of the aluminum liquid in the front box, the temperature of the aluminum liquid outflow can be better controlled, thereby improving the quality of the ingot.

The invention discloses a transverse crack control method for a niobium-containing steel casting blank, which comprises the following steps of: for a steel type with the niobium mass content of 0.02-0.15%, adopting tundish cover argon blowing and tundish sealing to reduce the nitrogen content in the tundish atmosphere to be below 2%; according to the mass content of steel grade carbon, soft reduction is not adopted or the reduction amount is smaller than 3 mm; the amplitude of the crystallizer is reduced, and the amplitude is controlled within 5 mm; and the amount of cooling water in continuous casting secondary cooling 2-5 zones is reduced, and the specific water amount is not more than 0.8 L / kg. According to the method, through tundish cover argon blowing and tundish sealing, nitrogen in air entering molten steel is reduced, nitrogen increasing of continuous casting molten steel is greatly reduced, and then the separation amount of niobium nitride in the casting blank cooling process is reduced; meanwhile, different soft reduction processes are adopted for steel types with different carbon contents, and under the condition that the requirements for center segregation and center looseness in the casting blank are met, the expansion of cracks on the surface of the casting blank is reduced.

This invention relates to a method for producing low-density, high-strength, and high-toughness protective steel plates from continuously cast billets, belonging to the field of metallurgy. The steel plate is an Fe-Mn-Al-C series austenitic low-density steel plate with an austenitic matrix supplemented by dispersed fine precipitated carbides, achieving high strength and high toughness, thus meeting the requirements for ballistic protection. The steel plate has a production thickness of 6-12 mm, a width of 1600-3000 mm, and a density of 6.75-7.05 g / cm³. 3 It has a density 7.85 g / cm³ higher than that of conventional steel. 3 The steel plate exhibits at least a 10% reduction in weight, good machinability and weldability, and excellent ballistic protection performance. A 6mm thick steel plate meets the NATO AEP STANAG 4569 standard Level I ballistic protection requirements, while a 12mm thick steel plate meets the NATO AEP STANAG 4569 standard Level II ballistic protection requirements. Production process: smelting—continuous casting—slow cooling—rolling—heat treatment—finishing—inspection—warehousing.

The application discloses an energy-saving multifunctional casting blank flame cleaning device, wherein fixed end pistons and floating end pistons are additionally arranged in the cleaning oxygen cavity of the upper and lower horizontal distributor piston cylinder assembly, the cleaning oxygen cavity is divided into three chambers, i.e., a fixed end chamber, an intermediate use chamber and a floating end chamber, the casting blank cross section is divided into eight optional cleaning areas, PID adjustment is performed on the other eight cleaning areas by using independent valve stations, multifunctional combination of the eight optional cleaning areas is realized, the surface defects of the casting blank can be cleaned in a fixed area and a fixed depth, unnecessary area cleaning is reduced, metal loss is reduced, the yield of finished products is increased, cost reduction and benefit increase are achieved, and the energy consumption is reduced. For hot blank, oxygen pressure of the relatively low temperature area at the edge, such as the top fixed end, the top floating end, the bottom fixed end and the bottom floating end, is increased to obtain a target cleaning depth, improve the hot blank hot delivery rate, reduce the energy consumption and help green metallurgy.

The application discloses a method for controlling slab corner cracks of a bending section of a continuous casting machine, and specifically comprises the following steps: S1, keeping the whole bending section water-permeable; S2, arranging water blocking mechanisms on the outer arc and the inner arc of the 3-4 zones in the bending section of the continuous casting machine, oppositely arranging the water blocking mechanisms on the outer arc and the inner arc, mounting the water blocking mechanisms on the bending section frame and arranging the water blocking mechanisms between the rollers of the bending section and corresponding water nozzles; arranging the water blocking mechanisms on the upper part and the lower part of the bending section in the vertical direction, and welding and fixing the water blocking mechanisms between the rollers and the water nozzles, covering two water nozzles of the 5th-17th rows of edge portions of the bending section in the pouring direction, wherein the second water nozzle of the edge portion blocks 50% of the spraying area; and S3, synchronously adjusting the water distribution of the bending section according to the total water volume of 90%-100% of the system and the secondary cooling specific water volume in the adjusting range of 0.6-1.2 L / kg to realize water distribution cooperation; and the method can precisely adjust the cooling area, thereby achieving the purpose of solving the slab corner cracks.

This utility model relates to a cooling pipe for a continuous casting billet crystallizer, belonging to the technical field of continuous casting crystallizers. It includes a copper pipe and a water jacket, both being square in shape. The copper pipe is placed inside the water jacket, forming a water gap between them. Multiple axially extending intermediate water grooves are provided on the four outer surfaces of the copper pipe. The depth of these intermediate water grooves on each outer surface of the copper pipe is such that the groove at the center of the plane is deeper, while the grooves on the two sides are shallower. The top surfaces of the intermediate water grooves on each outer surface of the copper pipe are flush, and the depth gradually decreases from the center of the plane to the two sides. This reduces excessive cooling at the corners of the copper pipe, avoids the "sharp corner effect," achieves uniform cooling of the copper pipe, and reduces the risk of corner cracks in the cast billet. It effectively controls the pulsation of the cooling water, reduces the occurrence of "hot spots," improves the cooling effect, and extends the service life of the crystallizer copper pipe.

The invention relates to a slab continuous casting high-temperature casting blank surface temperature on-line detection method, and belongs to the technical field of slab continuous casting, and the method comprises the following steps: S1, making a detection piece and a measuring disc based on a film temperature sensor, and installing the detection piece and the measuring disc on a corresponding secondary cooling zone fan-shaped section pinch roll according to process requirements; s2, performing local transient heat transfer conservation analysis on the temperature measurement nodes to obtain a heat balance equation considering conduction, convection and radiation heat transfer modes; s3, carrying out numerical calculation on the heat balance equation based on a single-node temperature time sequence discrete algorithm according to the temperature detection value so as to reconstruct and determine the actual temperature of the upper side of the water film on the surface of the casting blank; s4, performing theoretical analysis on a boiling heat transfer mechanism, and determining a corresponding critical characteristic temperature and a heat transfer mode; and S5, under a stable film state boiling heat transfer mechanism, according to a classical plate temperature analysis theory, reconstruction calculation is carried out again in combination with the obtained temperature of the upper side of the water film on the surface of the casting blank, and finally the real temperature value of the surface of the casting blank is obtained.

The invention relates to a hot-rolled steel strip for low-cost easily-formed low-temperature-resistant girder steel and a production method thereof, and belongs to the technical field of hot-rolled steel strip production. According to the technical scheme, the steel strip comprises the following chemical components in percentage by mass: 0.06%-0.12% of C, 0.10%-0.20% of Si, 0.60%-0.80% of Mn, less than or equal to 0.025% of P, less than or equal to 0.020% of S, 0.01%-0.06% of AlS, 0.03%-0.05% of Ti, less than or equal to 0.0060% of N, less than or equal to 0.28% of Ceq and the balance of iron and inevitable impurities. The low-carbon-low-manganese-micro-titanium component design is adopted, and the converter argon blowing direct feeding and hot feeding and hot charging processes are combined, so that the cost can be reduced by about 70 yuan per ton of steel; according to the design, alloy solid solution strengthening and fine grain strengthening are comprehensively considered, so that good strength, plasticity and toughness can be guaranteed, the elongation percentage is 26% or above, 0a cold bending is normal, and the ballistic work at the temperature of-20 DEG C is 160 J or above.

The invention discloses a water gap for a tundish, the tundish and continuous casting equipment, and relates to the technical field of continuous steel casting, the water gap is provided with a steel passing channel, seams and a dispersion area, the steel passing channel penetrates through the water gap, the seams are arranged outside the steel passing channel in a sleeving mode at intervals, and the seams comprise the first seam and the second seam communicating with the axial end of the first seam; the first seam is used for being communicated with an air source, the ring width of the second seam is larger than that of the first seam, and the dispersion area is communicated with the outer circumferential side of the steel passing channel and the inner circumferential side of the second seam. When the flowing speed and the pressure of argon are unstable and the argon enters the second seam from the first seam, the flow fluctuation or the pressure fluctuation of the argon blown out of the dispersion area caused by the pressure fluctuation of the gas source pipeline can be reduced or even eliminated, so that the adverse situation that nodules at the water gap fall off is improved.

The present invention relates to the technical field of electromagnetic stirrer equipment, and specifically to a traveling wave electromagnetic stirrer for metallurgy, comprising a traveling wave electromagnetic stirrer body and a body inlet and outlet water pipe and a cable installed on the traveling wave electromagnetic stirrer body. The traveling wave electromagnetic stirrer bodies are provided with two bodies, which are arranged relatively to each other. By adjusting the width W of a middle adjustment plate and the thickness H of an upper adjustment plate of a mounting seat assembly, the traveling wave electromagnetic stirrer bodies installed opposite to each other are adapted to different sizes of ingots. When different ingots are produced, the traveling wave electromagnetic stirrer bodies are close to the ingots, so that the magnetic induction intensity at the center of the ingot is high, efficient traveling wave stirring is achieved, and the quality of the ingots is improved.

The invention belongs to the technical field of casting, and particularly relates to a die casting protection casting device and a using method thereof. The die casting protection casting device is connected to a ladle nozzle in a sealed mode and comprises an upper sealing assembly, a lower sealing assembly and an adjusting device, and the upper sealing assembly and the lower sealing assembly are connected in a sealed and pressed mode. The adjusting device is connected to the steel ladle casting vehicle and connected with the upper sealing assembly. A ladle nozzle and a molten steel flowing area are wrapped, non-oxidation protection in the whole casting process is achieved, and the casting blank quality is improved.

The utility model relates to an anti-locking device for a fan-shaped section roller, and belongs to the technical field of continuous casting fan-shaped section equipment. Comprising rollers, bearing pedestals are arranged at the two ends of each roller respectively, the rollers are fixed in the bearing pedestals through bearings respectively, the opening sides of the bearing pedestals are covered with cover plates respectively, and framework sealing pieces are arranged between one side face of each bearing and the corresponding cover plate and between the other side face of each bearing and the corresponding bearing pedestal respectively. An anti-slag cover plate covers the outer side of the cover plate; oil filling holes are respectively formed in the tops of the bearing seats and are communicated with the inner cavities of the bearing seats; rotary joints are arranged on the outer sides of the cover plates respectively, a through central channel is formed in the center of the roller, the rotary joints penetrate through the anti-slag cover plates and the cover plates respectively and are connected with the two ends of the central channel, and metal hoses are connected to the rotary joints respectively. The two seals are arranged on the two sides of the bearing seat correspondingly, oxidizing slag is prevented from entering the bearing, the roller is prevented from being stuck, and the casting blank quality is improved.

The application discloses a cooling mold device and a continuous casting method thereof. The cooling mold device comprises a crystallizer assembly and a mold die assembly. The mold die assembly is arranged in the interior of the crystallizer assembly, and the mold die assembly and the crystallizer assembly are conically fitted and installed. The mold die assembly comprises a mold core rod, a first fixed copper sleeve, a second fixed copper sleeve and a plurality of mold inner linings. The plurality of mold inner linings are distributed in a circular array in a circumferential direction. The mold core rod is arranged in a cavity formed between the plurality of mold inner linings. The upper and lower ends of the plurality of mold inner linings are fixed by the first fixed copper sleeve and the second fixed copper sleeve respectively. The cooling mold of the application is composed of multiple materials with different thermal conductivity coefficients arranged in the circumferential direction. The application weakens the problem that the heat exchange coefficient is strong at the lower part and weak at the upper part of the casting blank due to the gravity of the casting blank itself during the horizontal continuous casting process. The cooling during the horizontal continuous casting process is more uniform. Therefore, the casting blank with more uniform structure, composition and performance can be obtained, and the quality of the casting blank is improved.

The utility model discloses a continuous casting billet baffle device which is characterized by comprising a baffle and a connecting rod which are connected through a connecting rod shaft, and a hydraulic cylinder used for driving the connecting rod to displace, the other end of the connecting rod is hinged to the frame which is welded and fixed to the beam. Two ends of the connecting rod shaft are connected with a hydraulic cylinder; the bottom of the hydraulic cylinder is hinged with a bracket fixed on the base; the two ends of the buffering device are matched with the crank and the bottom of the baffle respectively, and the crank is welded and fixed to the frame. According to the structure, the production rhythm can be effectively adjusted according to the rear-end conveying condition, and the accidents that casting blanks collide with each other or are separated from a roller way and the like can be greatly reduced. The automatic positioning device for the casting blank baffle effectively reduces the situation that the casting blank is scratched due to inaccurate positioning, and improves the quality of the casting blank.

This invention discloses a method for producing 1860MPa grade rare earth steel strand wire rod, comprising: smelting process; continuous casting process; rolling process: billet heating; controlled rolling parameters; controlled cooling process; the chemical composition of the wire rod by weight percentage is: C: 0.80-0.84%, Si: 0.20-0.30%, Mn: 0.75-0.85%, Cr: 0.18-0.22%, P≤0.015%, S≤0.010%, Ce: 0.002-0.004%, La: 0.001-0.002%, Al: 0.02-0.04%, Cu≤0.02%, As≤0.01%, O≤0.0015%, N≤0.008%, with the balance being Fe and unavoidable impurities; wherein the Si / Cr ratio is 0.9-1.7. The purpose of this invention is to achieve stable and compliant mechanical properties, improved production efficiency and environmental friendliness, and controllable costs through synergistic optimization of components and processes.

The invention discloses a structure optimization method of a four-flow tundish, which comprises the following steps: S1, acquiring real-time sensor data of molten steel, and installing a CCD (Charge Coupled Device) camera above the tundish to acquire real-time molten steel surface video image data; s2, the obtained real-time sensor data and real-time molten steel surface video image data are transmitted to a central control system to be preprocessed; s3, the central control system processes the real-time sensor data and the real-time molten steel surface video image data by adopting the trained convolutional neural network model, and outputs a turbulence suppressor type, a dam blocking position and an optimal turbulence suppressor parameter; and S4, the central control system carries out automatic adjustment by adopting an electric adjusting device according to the output turbulence suppressor type, the dam position and the optimal turbulence suppressor parameter. According to the central control system, the electric adjusting device is adopted for automatic adjustment according to the output turbulence suppressor type, the dam blocking position and the optimal turbulence suppressor parameter, and the casting blank quality is improved.

The invention relates to a small square billet continuous casting crystallizer detection method, and belongs to the technical field of forming. The method aims at improving the control accuracy of the continuous casting production process and the casting blank quality. According to the method, a micro sensor substrate is manufactured through the MEMS technology, heat flow and temperature detection elements are integrated, a passive wireless inductance antenna is arranged, and an external signal lead is not needed. The sensor is packaged in the screw-shaped measuring probe and can be directly screwed into a measuring threaded hole in the copper pipe wall of the crystallizer, so that the authenticity of measured data is ensured. Meanwhile, the signal receiver is packaged into a screw shape and installed on the water jacket, and signals are led out of the crystallizer through a lead and connected to a data acquisition system. The method has the advantages of high response speed and accuracy of the MEMS sensor, non-destructive installation mode and convenient signal transmission. In addition, the method is suitable for various small square billet / small round billet continuous casting machines, is easy to popularize and apply, and is beneficial to improving the stability of continuous casting production and the quality of casting billets.

The utility model belongs to the technical field of steel, and relates to a submersed nozzle which comprises a nozzle body, the nozzle body comprises a molten steel inlet end and a molten steel discharge end, a plurality of water outlets are formed in the tail end of the molten steel discharge end, the water outlets are strip-shaped openings and are located on the same straight line, the straight line is marked as a first straight line, and the second straight line is marked as a second straight line. The water outlets are symmetrical about the first straight line; the water outlets are integrally centrosymmetric; and each water outlet integrally forms a structure with a wide middle part and two narrow ends. According to the utility model, the possibility of slag entrapment on the liquid level is reduced, and the quality of casting blanks is improved.

The application discloses a production method of 70# high-carbon hard wire steel wire rod for spring, which comprises the following steps: hot metal pretreatment, converter smelting, LF refining, continuous casting, casting blank heating, rolling, finishing, and drawing after pickling and phosphating treatment of the wire rod, wherein the total compression rate is controlled to be 80-85%, and the finished product diameter is 5.5-12.0 mm. The application aims at solving the technical problems of insufficient composition control precision, casting blank quality defects, poor surface quality, poor organization uniformity and low process efficiency in the production of the existing 70# steel wire rod.

The invention discloses a method for predicting, regulating and controlling liquid level fluctuation of a slab continuous casting crystallizer. The method comprises the steps that current process control parameters of the crystallizer are obtained; inputting the current process control parameter into a pre-constructed liquid level fluctuation amplitude prediction model to obtain a crystallizer liquid level fluctuation amplitude which is output by the liquid level fluctuation amplitude prediction model and corresponds to the current process control parameter, the liquid level fluctuation amplitude prediction model is a power function expression which is obtained through regression analysis inversion by combining physical simulation experiment data with the crystallizer liquid level fluctuation amplitude as a response variable after a dimensionless relational expression used for describing crystallizer liquid level fluctuation is determined on the basis of a dimensional analysis principle. According to the method, the crystallizer liquid level fluctuation amplitude can be quickly predicted based on the current process control parameters by utilizing the prediction model. The model not only improves the prediction efficiency, but also quantifies the influence degree of each parameter on the fluctuation of the liquid level, provides a clear regulation and control direction, and is beneficial to the improvement of the quality of the casting blank under the working condition of high pulling speed.

The utility model relates to a cutting slag collecting device of a slab continuous casting machine, and belongs to the technical field of continuous casting in the metallurgical industry. Comprising a collecting hopper, a cutting roller is arranged above the collecting hopper, and a continuous casting billet is arranged on the cutting roller; a collecting guide plate is arranged above the collecting hopper, and the bottom of the collecting guide plate is connected with the collecting hopper; a slag flushing water pipe is arranged between the collecting guide plate and the cutting roller, an upper nozzle set is arranged at the top of the slag flushing water pipe, and the spraying direction of the upper nozzle set faces the cutting roller; a lower nozzle set is arranged at the bottom of the slag flushing water pipe, and the spraying direction of the lower nozzle set faces the collecting guide plate. A plurality of water outlet holes are formed in the collecting hopper, and a slag flushing trough is arranged below the collecting hopper. The device is simple in structure, large cutting slag is collected in the collecting hopper, the large cutting slag is prevented from blocking the slag flushing trough, and the labor intensity of workers is relieved; and the cutting slag on the cutting roller is flushed by the slag flushing water sprayed by the upper nozzle, so that the cutting slag is prevented from being adhered to the cutting roller, and the quality of a casting blank is improved.

The invention discloses a method for judging the occurrence reason and position of a transverse crack on the surface of a continuous casting billet, which comprises the following steps of: (1) cutting the transverse crack part on the surface of the continuous casting billet, cutting the continuous casting billet in the middle of the transverse crack, and polishing the cut section; (2) carrying out dendritic crystal erosion on the section, and observing whether dendritic crystal segregation exists or not through a metallographic microscope; (3) if dendritic segregation is observed and the minimum distance between the dendritic segregation part and the surface of the blank shell is smaller than the thickness of the blank shell out of the crystallizer, judging that the transverse crack occurs in the crystallizer; and (3) if dendritic segregation is not observed, judging that the transverse crack occurs in the secondary cooling area of the continuous casting machine. According to the method, the position and the reason of the transverse crack of the continuous casting surface blank can be accurately judged, and different control measures are adopted in a targeted manner, so that the occurrence of the transverse crack on the surface of the casting blank is effectively controlled, the quality of the casting blank is improved, and the production cost is reduced.

The invention belongs to the technical field of steel smelting and continuous casting, and particularly relates to a 460MPa-grade high-strength steel continuous casting large round billet and a preparation method and application thereof. The invention discloses a preparation method of a 460MPa-grade high-strength steel continuous casting large round billet. The preparation method comprises the following steps: (1) smelting to obtain molten steel meeting the standard; (2) the molten steel is subjected to continuous casting, the molten steel is crystallized in a crystallizer with the diameter phi being 800 mm, and a continuous casting blank is obtained; and (3) slowly cooling the continuous casting billet.

The utility model discloses a tundish lining structure, from inside to outside, include working layer, pouring layer, pressure-proof layer and thermal insulation layer, the thermal insulation layer clings to the cladding, the utility model discloses a composite structure of pressure-proof layer and thermal insulation layer is selected, pressure-proof layer intensity is high, can guarantee pressure-proof layer and thermal insulation layer not compressively deform under the static pressure of lining and molten steel, and the thermal insulation layer will not be compressed and deformed under the static pressure of lining and molten steel. The thermal insulation layer material is prevented from powdering; meanwhile, the pressure-resistant high-strength vermiculite plate is low in heat conductivity coefficient, has a good heat preservation effect, and can further improve the heat preservation and heat insulation performance of the tundish, reduce the temperature of the tundish shell, reduce the heat loss of molten steel, stabilize the continuous casting superheat degree and improve the casting blank quality in cooperation with the heat insulation layer structure.