91 results about "Electromagnetic stirring" patented technology

This invention discloses a method for preparing a large round billet for continuous casting of forged cold-rolled roll sleeves, comprising: controlling the composition system, wherein the chemical composition of the raw material steel is: C: 0.65-0.75%, Si: 0.25-0.40%, Mn: 0.35-0.50%, P≤0.020%, S≤0.020%, Cr: 1.90-2.10%, Ni: 0.30-0.45%, Mo: 0.20-0.40%, V: 0.05-0.10%; and controlling the continuous casting process parameters, wherein the superheat is controlled within a certain range. The casting temperature is maintained between 15 and 35°C, the casting speed is kept stable at 0.24 ± 0.01 m / min, the crystallizer water flow is controlled at 3700 L / min, and the secondary cooling water flow in the crystallizer is controlled at 0.12 L / Kg. During continuous casting, a 200 A / 2.5 HZ electromagnetic stirring of the casting flow and a 500 A / 1.2 HZ strong end electromagnetic stirring are used. The heat treatment process parameters for the continuously cast round billets are controlled as follows: red-charging annealing of the continuously cast round billets, furnace charging temperature ≥ 400°C, heating rate ≤ 100°C / h, holding at 730°C for ≥ 15 h, furnace cooling to 400°C, and air cooling upon exiting the furnace. This invention ensures the hardness and wear resistance of the cold-rolled roll sleeves while improving toughness and machinability, avoiding surface cracking and internal cracking of the roll sleeves during the casting and forging processes, ultimately achieving high-efficiency production and long service life of the roll sleeves.

The application discloses a kind of based on molten pool state feedback's titanium alloy laser welding pore control method and system, by design adjustable electromagnetic stirring power and frequency electromagnetic generating module connection magnetic field exerting component, establish the matching process parameter library of electromagnetic stirring and laser welding, cooperative adjustment infrared blue light composite laser welding process parameter, including infrared laser power, blue light laser power, welding speed and defocusing amount.Again using high-speed camera device carries infrared thermal imaging monitoring molten pool state, simultaneously construct real-time monitoring and feedback control system, to realize titanium alloy welding overall closed-loop control.Adopt the method of the application can realize the stirring of molten pool in laser welding process, make pore effectively escape, avoid the pore defect caused by gas not in time to escape under the condition that laser welding cooling speed is faster.Titanium alloy laser welding pore rate is reduced to 2% and below, compared with traditional laser welding method reduces more than 80%, significantly improves welding quality stability.

The application relates to the technical field of inconel steel production, in particular to high-strength inconel steel and a preparation method thereof. The inconel steel is composed of the following chemical components in percentage by weight: C: 0.04%-0.08%, Si:<0.5%, Mn: 0.2%-0.5%, P<=0.02%, S<=0.006%, Mo: 0.3%-0.85%, Ni: 35.5%-36.5%, Al: 1.3%-1.6%, Ti: 1.3%-1.7%, W: 0.3%-0.5%, Nb: 0.4%-0.6%, and the rest is Fe and impurity elements. The inconel steel manufactured by the application has a tensile strength of greater than or equal to 920 MPa, a yield strength of greater than or equal to 580 MPa, an elongation of greater than or equal to 8, a hardness of greater than or equal to 340 HV, and an expansion coefficient of 2.7-3.2*10-6 / DEG C. The application effectively solves the problems of coarse columnar crystal, low strength and easy crack of inconel alloy, improves the strength and crack sensitivity of the inconel steel through alloying and electromagnetic stirring, can not only improve the strength of the alloy, but also stabilize the expansion coefficient of the alloy, reduces the segregation and shrinkage hole phenomenon, and further improves the strength of the alloy.

The application discloses a method for producing zinc-aluminum-magnesium hot-dip galvanizing alloy in a cored induction furnace and relates to the technical field of zinc-aluminum-magnesium alloy production. The method innovatively proposes a sub-mother furnace segmented collaborative smelting process. The mother furnace is dedicated to the continuous melting and preliminary refining of pure zinc to ensure the high purity of the zinc liquid. The sub-furnace (tiltable cored induction furnace) is dedicated to the precise batching and alloying of aluminum and magnesium. The cored furnace is characterized by uniform electromagnetic stirring and precise temperature control, thereby realizing fine component regulation. This mode separately controls the melting of zinc and the preparation of alloy in different stages, thereby solving the bottleneck of single-furnace operation of the cored furnace, breaking through the capacity and component regulation limitations of single cored furnace production, and realizing continuous, efficient and precise production.

A production method for baseball bats based on 6-series recycled aluminum is provided, which includes steps such as pretreatment, melting, casting, homogenization treatment, extrusion, drawing, and subsequent processing. In the casting step, the crystallizer adopts electromagnetic stirring treatment to disperse larger Fe containing phases. In the homogenization treatment step, it is divided into primary and secondary homogenization two stages. The purpose of the primary homogenization treatment is to dissolve the Mg2Si phase with a low melting point into the matrix, and the purpose of the secondary homogenization treatment is to transform the elongated β-AlFeSi into spherical α-Al(FeMn)Si to eliminate harmful Fe phases. Heating treatment is used on the drawing mold during the drawing process, and warm forming helps to make aluminum alloy drawing smoother, reduce cracking, and eliminate the need to add other alloys during the production process of recycled aluminum melting.

This invention belongs to the field of metallurgical technology and relates to a production method for 22CrMoNbH heavy-duty niobium-containing gear steel. The method comprises three parts: chemical composition design, smelting production, and rolling production. The smelting process employs a four-stage process of "converter smelting – LF refining – RH vacuum degassing + continuous casting," precisely controlling impurity content and alloy uniformity. The rolling process utilizes "temperature-controlled rolling – slow cooling," optimizing microstructure and properties through dual electromagnetic stirring, temperature-controlled rolling, and slow cooling treatment. This invention, through niobium microalloying and synergistic process innovation, achieves a gear steel grain size ≥8 and a hardenability bandwidth ≤3HRC, significantly improving comprehensive mechanical properties and fatigue resistance. It can directly replace imported high-end heavy-duty gear steel, offering good production economics and is suitable for heavy-duty gear manufacturing in the automotive, heavy machinery, and other fields.

This utility model discloses a hydraulic lifting device for electromagnetic stirring at the bottom of a furnace, including a scissor frame, an installation and adjustment mechanism, a position locking mechanism, and a locking auxiliary mechanism. The installation and adjustment mechanism includes an installation plate and a top plate. The position locking mechanism includes a bottom fixing pipe and a locking rod. The locking auxiliary mechanism includes an outer rotating sleeve and a counterweight block. Through the directional sliding design of the installation plate on the top plate, combined with multiple sets of adjustment holes on the support platform, the problem of inconvenient adjustment of the installation plate position in traditional devices is solved. The cooperation between the slide rail and the bottom of the installation plate ensures the smooth and controllable sliding process, greatly improving the adjustment accuracy. Through the cooperation of the bottom fixing pipe, locking pipe, and locking rod, combined with the design of the inner wall block, rotating block, and counterweight spring, the problem of cumbersome fixing and disassembly of traditional devices is solved. This rotating sleeve connection replaces the traditional multi-point bolt fixing or complex buckle, and the connection and disassembly can be completed quickly without special tools.

This invention relates to a method for producing 120-150mm ultra-thick flaw-detecting steel using a 360mm cross-section continuous casting machine without an electromagnetic stirring system. The main improvements are made to the continuous casting process parameters as follows: the casting speed is set to 0.6-0.62 m / min; the surface theoretical straightening temperature is adjusted to 935℃ using the secondary cooling water ratio; simultaneously, the surface theoretical temperature from the bending section of the casting machine to the straightening section outlet is reduced by 15℃; the secondary cooling water ratio is 0.52-0.58 L / kg; and the total reduction is adjusted to 8.4mm for light... In the pressing mode, the reduction amount is redistributed. When the solid fraction is 0-30%, the reduction amount accounts for 20% of the total reduction amount; when it is 30-70%, the reduction amount accounts for 61% of the total reduction amount; and when it is 70-90%, the reduction amount accounts for 14% of the total reduction amount. The center of gravity of the reduction amount in the light pressing mode is shifted forward, so that the low magnification center segregation line position is dispersed into a discontinuous point distribution of individual segregation points. The low magnification center segregation is controlled within C1.5. Combined with the smelting process, rolling process and slow cooling process, 120-150mm ultra-thick steel plates with qualified flaw detection are obtained.

The present application relates to a kind of high-precision cold-rolled screw with medium carbon steel hot rolled wire rod in metallurgical technology field, preparation method and application.The present application is aimed at solving the technical problems of low first processing qualified rate of cold-rolled screw caused by poor material organization uniformity and low purity.The chemical composition of the wire rod according to the present application is as follows: C 0.52-0.58%, Si 0.15-0.35%, Mn 0.70-0.90%, Cr 0.10-0.35%, Al 0.015-0.045%, Ti≤0.0025%, [O]≤0.0015%, [N]≤0.0060% and the like, with the balance being Fe.The preparation method of the present application obtains uniform organization with cross-section hardness range ≤20HV through the combined action of narrow component design, continuous casting end electromagnetic stirring, high temperature diffusion annealing and "fast first and slow later" controlled cooling process.The present application is mainly used for manufacturing high-precision ball screw, and the finished product precision reaches more than 5 levels, with first cold-rolled forming qualified rate ≥85%.

The application discloses a continuous casting method of heavy section beam blank with high axis crystal rate, which comprises the following steps: controlling the superheat of the molten steel ΔT; controlling the pouring speed of the molten steel Vc; carrying out electromagnetic stirring on the web and the flange of the secondary cooling zone; controlling the secondary cooling intensity, the cooling water amount of each section and the distribution of the cooling water amount of each surface; and reasonably distributing the cooling area of each section to produce the heavy section beam blank with the axis crystal rate of 40-55%. The method is suitable for the heavy section beam blank with the weight of more than 1.5 tons per meter.

This invention discloses a method for smelting 400km / h hot-rolled U71MnG high-speed rails based on closed-loop control of inclusions throughout the entire process. The method includes: oxygen control and pre-deoxidation at the converter source; LF refining with aluminum-free deep deoxidation and simultaneous inclusion modification; VD vacuum purification and soft blowing to promote inclusion flotation; homogenization control throughout the continuous casting process; synergistic use of dual electromagnetic stirring and weak cooling water distribution; and precise control under dynamic light pressure. The chemical composition by mass percentage is: C: 0.71-0.74%, Si: 0.25-0.40%, Mn: 1.15-1.30%, P: ≤0.015%, S: 0.008-0.015%, and the Mn / S ratio ≥80. This invention addresses the core pain points of ordinary high-speed rail smelting through precise narrow composition design, closed-loop control of inclusions throughout the entire process, and synergistic regulation of homogenization during continuous casting, achieving a unified approach to ultra-high-speed service adaptability, high purity, and high yield of hot-rolled rails.

The present application belongs to the technical field of steel metallurgy and powder metallurgy raw material preparation, and discloses a preparation method of tundish high-purity molten steel for powder metallurgy. The tundish is sequentially provided with a pre-agitation zone, a filtration zone and a final purification zone along the direction of molten steel flow. A main electromagnetic stirring coil is installed at the bottom of the pre-agitation zone, an open-pore retaining wall is arranged in the filtration zone, an auxiliary electromagnetic stirring coil and a pouring zone are arranged at the bottom of the final purification zone, and an array-type bottom argon-blowing gas permeable brick is arranged in the pouring zone. The problems of incomplete removal of inclusions and poor molten steel uniformity in the traditional tundish are solved. By using the method, the elimination rate of non-metallic inclusions with a particle size greater than 20 microns is greater than 97%, the molten steel temperature fluctuation is less than or equal to ±2℃, and the composition uniformity error is less than or equal to 0.01%. The method provides stable high-purity molten steel raw material for powder metallurgy atomization powder production, is simple and easy to implement, and is suitable for existing conventional production lines.

This invention provides a method for interfacial coating of aluminum alloy wires modified with nano-high conductivity particles, belonging to the field of wire processing technology. The method includes: firstly, pretreating solid nano-high conductivity particles sequentially, followed by mechanical dispersion, ultrasonic dispersion, and vacuum drying under an inert atmosphere to obtain uniformly dispersed particle powder; then, inorganically coating the powder under stirring and densifying it through annealing to obtain coated modified nano-high conductivity particles; quantitatively adding the coated particles to an aluminum alloy melt, and obtaining a composite melt through electromagnetic stirring and ultrasonic dispersion; finally, forming the composite melt into a billet, which is then rolled and drawn sequentially to obtain the finished modified aluminum alloy wire. This invention effectively improves the problems of easy agglomeration of nano-high conductivity particles and poor interfacial bonding with the aluminum alloy matrix, enhancing the overall conductivity and mechanical properties of the wire while improving the density of the particle coating layer and the uniform dispersion of particles in the matrix.

The application discloses a kind of based on crystallizer electromagnetic stirring bar surface inclusion control method, belong to steel metallurgy continuous casting and rolling technical field.The method first establishes the finite element model of multiple pass rolling process from continuous casting billet to target bar, and using node reverse tracking technology, the specific area of continuous casting billet that has decisive influence on bar surface quality is determined as target clean control area.Subsequently, the multi-physics field coupling model of flow, solidification and inclusion movement in crystallizer is constructed, and the installation position of crystallizer electromagnetic stirrer that can make the inclusion capture probability in target clean control area be reduced to the lowest is determined as the optimal process position by simulation analysis.Finally, electromagnetic stirrer is installed according to this position in actual continuous casting production and production is carried out.The application realizes accurate targeted control of cleanliness of key area of continuous casting billet from the requirement of final product quality, and significantly improves the surface quality and service performance of high fatigue requirement steel such as bearing steel.

The disclosure describes a furnace system and a method for electromagnetic stirring of a metal melt. The furnace system includes a furnace for melting a metal material and a stirring system. The stirring system consists of at least two electromagnetic stirring units. The electromagnetic stirring units are located beneath the furnace on the vertices of an N-polygon. N is the number of electromagnetic stirring units. Each electromagnetic stirring unit is configured to induce a force on the metal material along a main direction of each electromagnetic stirring unit. The projection of the main direction of each electromagnetic stirring unit into a horizontal plane defines a main axis of each electromagnetic stirring unit. Each main axis of each electromagnetic stirring unit essentially passes through the center of the N-polygon.

This invention discloses a continuous casting crystallizer water tank structure integrating a composite magnetic field device. The structure features a rectangular through-hole window in the middle of the main thick plate. Upper, middle, and lower transverse partitions are spaced apart within the rectangular through-hole, dividing it into an upper electromagnetic stirring installation area and a lower electromagnetic braking installation area. Longitudinal partitions are located on both sides of the rectangular through-hole. An arc-shaped bottom sealing plate is located on the bottom surface of the rectangular through-hole and below the lower transverse partitions. A cooling water circulation cavity is formed between the periphery of the rectangular through-hole, the upper transverse partitions, the lower transverse partitions, the longitudinal partitions, and the arc-shaped bottom sealing plate. A sealing plate is located on the back of the main thick plate and seals the cooling water circulation cavity. Inlet and outlet pipes are located on both sides of the main thick plate and connect to the cooling water circulation cavity. This structure provides independent and non-interfering installation space for electromagnetic stirring and electromagnetic braking, improving the structural strength and cooling performance of the water tank and ensuring stable operation of the electromagnetic equipment under complex working conditions.

Provided is an electric furnace equipment / system that prevents overheating of molten metal by converting heat transfer between the molten metal and slag from thermal conduction to forced convection, thereby improving productivity without requiring oversized equipment. The electric furnace equipment / system is configured to accommodate molten metal, slag, a metal raw material, and an auxiliary raw material in stacked layers, and to discharge the molten metal and slag. The electric furnace equipment / system comprises: an arc furnace having a bottom portion, a furnace wall, and a furnace cover; and an electromagnetic stirrer disposed at a predetermined position at the bottom portion or on the side wall of the arc furnace to enable stirring of the molten metal within the arc furnace.

This application relates to the field of target technology and provides a method for casting aluminum targets, comprising: melting aluminum raw materials to form aluminum liquid, and then sequentially refining and filtering the aluminum liquid; performing semi-solid casting on the filtered aluminum liquid to cast an aluminum target; wherein the semi-solid casting process includes a pre-steady-state stage and a steady-state stage; the parameters of the semi-solid casting process change in the pre-steady-state stage, and the aluminum liquid is subjected to ultrasonic treatment in the pre-steady-state stage; the parameters of the semi-solid casting process do not change in the steady-state stage, and the aluminum liquid is subjected to ultrasonic treatment and electromagnetic stirring treatment in the steady-state stage. This application achieves grain refinement of high-purity aluminum (mass purity > 99.999%) targets using a semi-solid casting process.

A production method for solving the problem of transverse cracks at the ends of 130mm square cross-section 3SP steel continuous casting billets is disclosed. This method includes converter primary refining, continuous casting, and billet inspection processes. The generation of transverse cracks at the ends of the 130mm square cross-section continuous casting billets is suppressed by controlling key process parameters in the converter charging process, the deoxidation and alloying process at tapping, and the continuous casting process. In the converter process, when smelting 3SP steel, ladles with low sulfur content (S) are selected, requiring the charging molten iron [S] to be ≤0.030%, and the molten steel [S] to be ≤0.022% after converter primary refining. In the converter deoxidation and alloying process, the [Mn] content of the molten steel is controlled to be ≥0.55%, ensuring an Mn / S ratio ≥25, and the tapping temperature is 1650℃-1680℃. In the continuous casting process, the tundish baking temperature is ≥1050℃, the superheat during continuous casting is controlled to be 20℃-35℃, the electromagnetic stirring current in the crystallizer is 200-250A, the frequency is 2.5-4HZ, the casting speed is controlled to be 2.9-3.5m / min, and the specific water content is controlled to be 1.2-1.4L / kg. This invention effectively suppresses the generation of transverse cracks at the ends of continuously cast billets and improves the internal quality and overall yield of the billets by optimizing the key process parameters of the converter and continuous casting processes.

The application relates to the technical field of non-ferrous metal material processing, in particular to a high-strength and high-conductivity copper alloy containing boron and a cryogenic deformation heat treatment method thereof. The cryogenic deformation heat treatment method comprises the following steps: vacuum melting and casting and composite purification, homogenization treatment, hot rolling and quenching, three-stage cryogenic plastic deformation treatment, multi-stage cold rolling and grading aging treatment. The application adopts the process of vacuum melting and casting and composite purification, avoids oxidation by adopting vacuum melting and casting, carries out composite purification by combining ultrasonic vibration and electromagnetic stirring, refines melt grains by ultrasonic vibration, promotes FeB phase dispersion precipitation by electromagnetic stirring, and solves the problem of uneven distribution of impurities in traditional melting and casting.

The application provides a method for remelting powder superalloy coarse powder return material, and relates to the technical field of nickel-based superalloy refining. The method for remelting powder superalloy coarse powder return material comprises the process steps of coarse powder return material forming, alloy powder ingot smelting, alloy powder ingot refining, alloy powder ingot strengthening refining and coarse powder return material ingot pouring. The binder is at least one of pectin, dextrin, fructose, amylopectin and potato starch. The application realizes the aggregation and dissolution of small-particle oxide inclusions by reasonable binder and coarse powder return material ratio, alloy powder ingot and alloy new material ingot ratio, twice refining process selection, high-temperature melt treatment and strong electromagnetic stirring, so that the size and quantity of inclusions are reduced; then, [O], [N] and [H] are deeply removed by improving the vacuum degree and prolonging the refining time, and the content of [H] is the lowest and can reach zero point several ppm.

This invention discloses a method for controlling corner cracks in large square billets of medium carbon alloy steel, belonging to the field of steelmaking production technology. The control method includes a continuous casting process and a crystallization cooling process. In the crystallization cooling process, the flow rate of cooling water on the wide face of the crystallizer is 1500±10 L / min, the electromagnetic stirring current of the crystallizer is 400±5 A, and the frequency is 2.4±0.1 Hz; the flow rate of cooling water on the wide face of the secondary cooling water zone 1 is 34±2 L / min, and the secondary cooling water zones 2-4 use weak cooling spray. This invention employs a low casting speed + high-intensity electromagnetic stirring in the crystallizer + strong cooling in the crystallizer + strong pure water cooling in the secondary cooling water zone 1 + weak cooling and reheating via mist in the secondary cooling water zones 2-4 to control the rectangular continuous casting billet. This forms a dense and tough skin structure on the surface of the billet corner, thereby reducing the generation of corner straightening cracks during the straightening process and effectively solving the problem of corner cracks in large square billets of medium carbon alloy steel.

The application provides a method for manufacturing hollow wind power main shafts from large-diameter round steel continuous casting blanks, which realizes high-performance manufacturing through a four-stage process. First, an electromagnetic stirring continuous casting process is used to prepare continuous casting round blanks, with the composition controlled to be C 0.38-0.42%, Cr 1.10-1.25%, Mo 0.15-0.25% and V 0.08-0.12%. Multidirectional forging is implemented through a three-way pressurizing device to perform axial upsetting and conical anvil spinning, combined with radial restraint force, to reduce the porosity of the wind power main shaft. After the blank is pre-bored by a solid punch, inclined rolling hole expansion is performed by a double-roller asynchronous rolling mill, and the hole expansion rate is controlled to realize uniform hole wall structure. The gradient heat treatment stage includes normalizing combined with atomized water gas cooling, and an axial magnetic field is applied during tempering, so that the final product can realize excellent mechanical properties and grain size. Through the synergistic effect of multidirectional forging and composition optimization, the technical problems of high porosity of continuous casting blanks and alloy segregation are solved.

This invention discloses a production method for preventing cracking of non-quenched and tempered steel billets used in high-strength connecting rods. Addressing the existing problems of high crack sensitivity and deep longitudinal cracks in continuously cast billets and rolled products, this invention first designs a suitable chemical composition for the billet, and then optimizes the entire process from continuous casting, rolling into the furnace, heating, to post-rolling cooling to achieve precise control over billet temperature, stress, and microstructure segregation. Continuous casting employs low-superheat casting with two-stage electromagnetic stirring; rolling into the furnace uses high-temperature slow cooling or high-temperature hot delivery; the heating process is designed differently based on the furnace entry temperature; and post-rolling uses ultra-high-temperature slow cooling in a pit, fundamentally reducing surface stress and core segregation in the billet and preventing cracking. This invention improves the product qualification rate by 10%~15%, stably and efficiently producing high-strength non-quenched and tempered steel bars for connecting rods that meet the needs of the automotive industry, eliminating the need for quenching and tempering heat treatment, and offering advantages such as lightweighting, energy saving, and reduced consumption, thus enhancing the product's market competitiveness.