116 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 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 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 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 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 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.

This application provides a method for producing high-performance, thick steel plates for wind turbine piles, characterized by the following steps: steelmaking, continuous casting, stacking cooling, billet heating, rolling, post-rolling cooling, and heat preservation; wherein the rolling process adopts a one-stage high-reduction rolling; the post-rolling cooling process adopts a three-stage cooling, with the first stage being high-pressure water cooling, the second stage being air cooling, and the third stage also being high-pressure water cooling; the extra-thick steel plate prepared by the above method has a surface microstructure of ferrite + bainite dual-phase microstructure with an average grain size of 6μm; the core microstructure is a multiphase microstructure of ferrite + bainite + a small amount of pearlite with an average grain size of 12μm; it has both excellent strength and toughness, and also has a high flaw detection pass rate and high surface quality.

The application discloses a method for adjusting the size of a cutting tumor of a continuous casting billet through an online cutting speed control, and belongs to the field of steelmaking and continuous casting. The method is applied to a continuous casting production line comprising a flame cutting machine, a straightening and leveling machine and a burr machine, and comprises the following steps: according to the cross section specification of the billet, process parameters are retrieved and edge positioning is completed; the automatic cutting mode is switched to; according to the width of the billet, the length of the fixed size and the basic cutting speed, an adaptive cutting speed coefficient is selected, and the oxygen pressure and the height of the cutting nozzle are adjusted; the cutting is automatically started at the set length of the fixed size; the burr thickness is detected online at the burr machine side, the burr thickness is taken as a feedback signal, when the thickness is less than or equal to 1 mm, the pulling speed and the cutting speed are synchronously reduced, when the thickness is greater than or equal to 1.5 mm, the original speed is adjusted back, and a closed loop control loop is formed. The application solves the technical problems that the size of the cutting tumor cannot be accurately controlled online in the process of the flame cutting of the existing continuous casting billet, and that the residual cutting tumor causes scabbing defects in subsequent rolling, does not need to additionally increase equipment investment, is easy to implement, and has wide industry applicability.

The invention discloses an LF (Ladle Furnace) refining method for reducing formation of large inclusions in high-speed rail steel smelted by high-sulfur molten iron. The LF refining method comprises the following steps: in the early stage of LF refining, producing high-alkalinity slag for desulfurization, performing secondary slagging, performing strong stirring to enable steel slag to fully react, and performing weak stirring to promote floating of the inclusions; in the step of secondary slagging, 1.8 kg / t-3. 0 kg / t of wollastonite and 3.0 kg / t-4. 5 kg / t of bauxite are added, a low-alkalinity high-aluminum refining slag system is built, the content of Al2O3 in slag is controlled to be 10-15 wt%, and the alkalinity R of the slag is controlled to be 1.5-2.2; and the secondary refining time is 15-20 minutes. The method can effectively reduce the formation of large inclusions in the production processes of steelmaking, continuous casting, rolling and the like of the high-speed rail steel, and reduces the deformation capacity of the inclusions after rolling.

The invention relates to normalizing-free low-iron-loss high-grade non-oriented silicon steel as well as a preparation method and application thereof, and belongs to the technical field of cold rolling and steel for household appliances. The preparation method of the normalizing-free low-iron-loss high-grade non-oriented silicon steel comprises the treatment procedures of steelmaking, continuous casting, hot rolling, acid pickling, cold rolling and continuous annealing, and the cold rolling procedure comprises the steps of primary cold rolling, cover annealing and secondary cold rolling. On the basis of a secondary cold rolling method, the normalizing-free high-grade non-oriented silicon steel with low iron loss and excellent electromagnetic performance is prepared on the premise that the normalizing procedure is omitted by optimizing component design and technological parameters such as rolling and annealing, and the normalizing-free high-grade non-oriented silicon steel is stable in component and pure in steel quality.

The invention discloses an online width adjustment precise control method for a slab continuous casting machine crystallizer, and belongs to the technical field of steelmaking continuous casting production. According to the method disclosed by the invention, the stable operation of online width adjustment of the crystallizer is realized, the fault occurrence rate is reduced, and the casting blank quality is guaranteed by determining the width adjustment steel grade range, standardizing the equipment inspection process and accurately controlling key process parameters; according to the method, the problems of poor steel type adaptability, inaccurate parameter control and high equipment failure risk in the existing crystallizer online width adjusting technology are solved.

The invention relates to the field of metal materials, and discloses hot-rolled pickled steel for ultra-deep drawing and a preparation method of the hot-rolled pickled steel. The hot-rolled pickled steel for ultra-deep drawing comprises the following chemical element components in percentage by weight: less than or equal to 0.003% of C, less than or equal to 0.03% of Si, 0.10-0.40% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.001-0.06% of Al, 0.01-0.03% of Ti, 0.02-0.04% of Nb, 0.0015-0.0035% of B, 0.001-0.003% of N, 0.001-0.003% of Ca, less than or equal to Ti + 0.67 Nb + 0.01% of Al and more than or equal to 0.0005% of B-0. 78N. The hot-rolled pickled steel plate with good surface quality and ultra-deep drawing performance is obtained through reasonable chemical component design in cooperation with steelmaking, continuous casting, hot rolling, pickling and leveling processes, and the requirement for the ultra-deep drawing purpose is met.

The invention belongs to the technical field of steel-making continuous casting, and discloses a steel-making steel ladle with a conical bottom and a construction method thereof.A lower nozzle at the bottom of the steel ladle is used as a vertex, the dip angle ranges from 12 degrees to 20 degrees, and the ladle wall is built with refractory materials to form the conical bottom; the construction method comprises the following steps: setting the height from the upper opening of the lower nozzle to the bottom of the ladle wall to be 100-200mm, and adjusting the slope ratio to be 0.2-0.35; an annular building mode is adopted, and an angular instrument is used for monitoring errors within + / -0.5 degrees in real time; and the flatness error of surface treatment after building is not more than 10mm. The method is beneficial to complete flowing of molten steel, low-liquid-level slag entrapment is avoided, the molten steel yield is increased, and the slag discharging risk is reduced.

The utility model belongs to accessory equipment in a continuous casting area of a steel plant, and particularly relates to a steelmaking continuous casting cooling water filtering device. In order to solve the problem that impurities and sludge in an existing water storage tank block a pipeline system of continuous casting cooling water, the device for filtering water with impurities flowing back to the water storage tank secondarily is designed, and the effect of purifying the water flowing back to the water storage tank is achieved. Comprising a collecting water tank located at the bottom of the continuous casting machine and used for collecting cooling water flowing down from the billet surface. A sewer pipe is arranged at the bottom of the collecting water tank and used for guiding cooling backflow water to the water storage pool. A material receiving and overturning unit is arranged between the sewer pipe and the water storage tank and comprises a material collecting hopper, a water leakage hole is formed in the bottom of the material collecting hopper, cooling water is allowed to pass through the water leakage hole, and meanwhile large-particle residues are blocked. A slag tank is arranged on one side, far away from the reservoir, of the collecting hopper; and the collecting hopper is driven by a rotary driving mechanism to rotate so as to pour the slag into the slag tank.

This invention relates to the field of automotive steel technology, specifically to a 220MPa grade low-wavyness hot-dip galvanized bake-hardening steel sheet, its manufacturing method, and its application. The main chemical elements are C, Si, Mn, P, Als, Nb, N, and S. The dissolved C content in the steel is 0.0008%–0.0015%, with the balance being iron and unavoidable impurities. This invention also discloses a manufacturing method for the above-mentioned bake-hardening hot-dip galvanized steel sheet, including steelmaking, continuous casting, slab heating, hot rolling, laminar flow cooling, pickling, hot-dip galvanizing, and leveling processes. The surface waviness Wsa of the produced steel sheet after 5% forming is... (1‑5) ≤0.35μm, increase in surface waviness ΔWsa (1‑5) With a thickness of ≤0.05μm and a yield strength of 220~280MPa, it meets the application requirements of water-based no-primer coating process for automotive exterior body panels.