706 results about "Induction furnace" patented technology

According to the smelting method for refining the size of the inclusions of the invar alloy and the invar alloy, a large-size invar alloy steel ingot is prepared through the processes of induction furnace smelting, AOD furnace refining, LF furnace refining, VD furnace refining and die casting, in the AOD furnace refining process, an Al-Si-Mn composite deoxidizing agent is adopted for deoxidizing, in the LF furnace refining process, Ni-Mg alloy is added, and in the VD furnace refining process, the Al-Si-Mn composite deoxidizing agent is adopted for deoxidizing; the impurities are decomposed and refined, the impurities are controlled to be Al2O3-MgO-SiO2 series impurities, the grade of the A type impurities, the grade of the B type impurities, the grade of the C type impurities and the grade of the D type impurities are smaller than or equal to 0.5 grade, and the grade of the Ds type impurities is 0 grade. The method can effectively refine the size of the inclusions in the invar alloy molten steel, reduce the occurrence rate of local peeling defects on the surface of the cold-rolled strip caused by large-size deoxidized products, and improve the product quality and the yield of the invar alloy strip.

The invention belongs to the field of metal materials, and provides a hard alloy wear-resistant steel ball suitable for mine ore grinding and a preparation method thereof.The hard alloy wear-resistant steel ball is prepared from waste steel pig iron as a basic raw material and chemical components including 2.1%-2.2% of C, 9.8%-10.0% of Cr, 0.10%-0.20% of V and 0.03%-0.06% of Ti; a core-shell precipitated phase microstructure design with MN / MCN as a hard core and chromium carbonitride as a gradient self-passivation shell layer is formed through medium-frequency induction furnace smelting, controlled nitrogen introduction establishment of a V-Ti-C-N microalloy system, bottom pouring solidification and austenitizing quenching and tempering heat treatment processes, and the performance indexes that the surface hardness is HRC60-63 and the core hardness is HRC54-58 are achieved; the average particle size of a core-shell precipitated phase is in dispersed distribution of 20-200nm, the shell thickness is 5-50nm, and the alloy steel ball has excellent wear resistance and corrosion resistance under the high-impact and high-wear working conditions of wet ore grinding, solves the problem of insufficient wear resistance and corrosion resistance of a traditional alloy steel ball, and has wide mine ore grinding application value.

The invention relates to a high-nitrogen steel preparation method capable of efficiently and accurately increasing nitrogen through pressurized gas phase nitriding and bottom blowing nitrogen, which comprises the following steps: filling a furnace chamber of a pressurized induction furnace with first target nitrogen pressure, and entering a molten steel surface gas phase nitrogen increasing stage; and then pressurizing and bottom blowing nitrogen, controlling the pressure of the bottom blowing nitrogen by adjusting the output pressure of a nitrogen cylinder, controlling the bottom blowing flow, and entering a pressurized gas phase nitriding and bottom blowing nitrogen increasing stage. And then pressurizing bottom nitrogen blowing is stopped, second target nitrogen pressure needed by casting continues to be filled into the furnace cavity of the pressurizing induction furnace, and the molten steel surface gas phase nitrogen increasing stage under the casting nitrogen pressure enters. By combining the bottom blowing nitrogen, the nitrogen increasing efficiency is improved, the preparation period is greatly shortened, and therefore the production efficiency of the high-nitrogen steel is improved. Besides, the nitrogen pressure, the bottom blowing flow and the nitrogen increasing amount are accurately controlled in stages, dynamic prediction is carried out in combination with a calculation formula, accurate control over the liquid nitrogen content of the steel is achieved, and the requirements of different high-nitrogen steel products are met.

The invention relates to the technical field of silicon carbide single crystal growth, in particular to a high-purity semi-insulating silicon carbide single crystal for an optical element and a growth process thereof.The growth process includes the steps that S1, silicon carbide powder, a graphite crucible and the like are assembled to form a thermal field device, the thermal field device is placed in an induction furnace, room-temperature furnace washing treatment and low-temperature furnace washing treatment are sequentially carried out, and the silicon carbide powder is obtained; carrying out thermal field impurity removal treatment; s2, assembling the silicon carbide seed crystal and the impurity-removed thermal field device, raising the temperature in the induction furnace, conveying high-purity argon or mixed gas of high-purity argon and high-purity hydrogen into the induction furnace, and performing crystal growth; s3, after crystal growth is finished, high-temperature and high-pressure annealing treatment is carried out firstly, then furnace cooling treatment is carried out, and the high-purity semi-insulating silicon carbide crystal ingot for the optical element is obtained. The silicon carbide crystal ingot with excellent light transmission performance and high resistivity is obtained by selecting specific raw materials, reasonably designing an assembly mode and combining processes of thermal field impurity removal, high-temperature and high-pressure annealing and the like.

The invention discloses a device and a method for preparing single-wall and few-wall carbon nanotubes, and relates to the technical field of nano carbon materials, the device structurally comprises a heating system, a feeding system, a gas path system, a cooling system and an electrical system, the heating system comprises a medium-frequency induction furnace, an induction coil and a graphite crucible; the gas path system comprises a gas inlet; the feeding system comprises a second catalyst feeding hole and a discharging hole; wherein the feeding hole is formed above the graphite crucible, the air inlet is formed in the side surface of the medium-frequency induction furnace, and the discharging hole is formed in the other side of the medium-frequency induction furnace. The metal molten pool is used as a heat source, a steady-state heat source is provided for catalyst evaporation and single-wall / few-wall carbon nanotube growth, compared with a plasma method and an electric arc method, catalyst evaporation is more uniform and mild, the catalyst utilization rate is increased, and the single-wall / few-wall carbon nanotube growth efficiency is remarkably improved.

The manufacturing method comprises the following steps that S1, raw materials, an organic auxiliary agent and pure water are subjected to slurry preparation in a ball milling tank according to the proportion, a boat support splitting part blank is obtained through a slip casting technology, and a boat support splitting part blank is obtained; performing natural drying and hot air drying on the green body to discharge moisture, and then fettling and carving the green body into a boat support splitting part semi-finished product meeting the size requirement; s2, putting the semi-finished product in S1 into an induction furnace, purifying and sintering at high temperature of 2000-2300 DEG C under the protection of inert gas, and obtaining a silicon carbide boat support splitting part biscuit which has the open pore porosity of 8-10% and the strength of more than 70 Mpa and contains a small amount of free carbon after high-temperature purifying and sintering; and S3, splicing the silicon carbide boat support splitting part biscuits, feeding the spliced whole boat support into a vacuum furnace, carrying out high-temperature siliconizing sintering treatment at 1650-1700 DEG C, and carrying out grinding, sand blasting, fine cleaning, impurity removal, ultrasonic cleaning and drying process treatment after discharging to obtain the low-iron-content boat support.

The invention provides an extrusion processing method of a niobium-tungsten alloy cast ingot and a niobium-tungsten alloy extrusion processing product, the extrusion processing method comprises the following steps: carrying out stepped heating on the niobium-tungsten alloy cast ingot with an anti-oxidation coating by using a medium-frequency induction furnace to obtain a blank to be extruded, the lowest holding temperature of the stepped heating is 800 DEG C + / -20 DEG C, the highest holding temperature is 1200 DEG C-1300 DEG C, and the total duration of the stepped heating is 30 min-45 min; and the blank to be extruded is subjected to non-sheath extrusion machining in the extrusion cylinder, and the niobium-tungsten alloy extrusion machining product is obtained. The non-sheath extrusion processing method provided by the invention has the advantages that the production period is shortened, the production loss is reduced, and the surface quality, the straightness and the processing plasticity of an extrusion processing product are improved.

The invention relates to the technical field of industrial waste treatment and silver nitrate preparation, in particular to a method for preparing high-purity silver nitrate from silver-containing waste. The method comprises the following steps: reducing the silver-containing waste by adopting a liquid phase reduction method, pickling to remove impurities, putting the silver-containing waste into a medium-frequency induction furnace, performing high-temperature smelting and ingot casting, performing electrolytic purification to obtain crude silver powder, and performing smelting and ingot casting on the crude silver powder to obtain a raw material national standard No.1 silver ingot for preparing silver nitrate; the method comprises the following steps: putting a national standard No.1 silver ingot and a nitric acid solution into a reaction kettle according to a certain proportion for dissolving silver, carrying out adsorption and impurity removal on a dissolved solution through ion exchange resin, carrying out adsorption and impurity removal on a primary filtrate through chelating type adsorption resin, and carrying out centrifugation, evaporative crystallization, drying and other processes on a secondary filtrate to obtain the high-purity silver nitrate. The method is easy to implement, the recovery rate of the silver-containing waste materials is high, the high-purity silver nitrate product can reach the premium-grade pure standard, and the technological process is environmentally friendly.

The invention discloses a heat treatment device for drill bit production, relates to the technical field of drill bit heat treatment, and solves the problems that when an existing heat treatment device for drill bit production is used, originally thrown-away chippings and oxide skin can be rolled into quenching liquid again and possibly attached to the surface of a drill bit again. A quenching barrel and an induction furnace are fixedly connected to the two ends of the base respectively, a support is fixedly connected to the top of the base, a first motor is embedded into the top of the support, a U-shaped frame is rotationally connected to the top of the support, and the end of a main shaft of the first motor is fixedly connected with the bottom of the U-shaped frame; the two ends of the top of the U-shaped frame extend towards the two sides correspondingly to form a pair of symmetrical bearing parts, and reciprocating lead screws are arranged at the bottoms of the bearing parts correspondingly. The drill bit heat treatment device has the advantages of being good in chipping and oxide skin removal effect and high in drill bit heat treatment efficiency.

The invention discloses a hot extrusion forming process of a stainless steel pipeline, which belongs to the technical field of metal material preparation and comprises the following steps of blank preparation, preheating, primary heating, primary lubricating, reaming, cleaning, secondary heating, secondary lubricating and hot extrusion. Wherein the secondary lubrication is that the blank after the secondary heating is completed is put into an extruding machine to be subjected to the secondary lubrication. According to the invention, the required stainless steel pipeline is produced through cooperation of chambering and hot extrusion; the process of secondary lubrication is completed in the extruder, so that the time consumed from the induction furnace to the lubrication workbench and then to the extruder is shortened, the lubrication workbench is omitted, the lubrication process of a blank is completed in the extruder, the temperature of the blank is within a moldable temperature range, and the quality of a finished product formed by hot extrusion is improved; and the performance requirements of stainless steel pipeline finished products can be met.

The invention relates to the technical field of image data processing, in particular to an induction furnace coil temperature field visual monitoring method based on thermal imaging, and the method comprises the steps: obtaining the three-dimensional temperature field data of an induction furnace coil, and extracting high-temperature voxels; an adaptive weight is constructed for each high-temperature voxel, and the weight is composed of two parts: 1, the local linearity of the voxel is determined by calculating the projection density of the voxel in multiple directions; secondly, obtaining a colinearity score by calculating the consistency of the candidate voxel and other candidate voxels in the neighborhood of the candidate voxel in the local main direction; and performing weighted Hough transform on the candidate voxels to vote by taking the product of the two as an adaptive weight. Through the intelligent weighting mechanism, real linear fault signals can be effectively amplified, noise interference is suppressed, and the detection accuracy and robustness of early discontinuous linear high-temperature faults are improved.

The invention discloses a medium-frequency induction furnace molten metal leakage automatic cut-off system based on temperature monitoring, and relates to the technical field of industrial molten metal monitoring, and the system comprises a data acquisition module which is used for obtaining historical temperature data under different working conditions in a high-temperature and high-pressure environment by constructing a molten metal temperature feature library, and sending the historical temperature data to a data processing module; the data classification module is used for classifying and marking various flow scenes to form an initial data set containing a temperature distribution rule in a normal flow state and obtain reference data for subsequent mode definition, and the risk assessment module is used for generating a risk level according to the initial data set and determining the risk degree of a current flow state; according to the medium-frequency induction furnace molten metal leakage automatic cut-off system based on temperature monitoring, molten metal flowing abnormity is found in time, the risk degree is accurately evaluated, monitoring parameters are automatically adjusted to deal with the high-risk state, and the safety and controllability of the molten metal production process are effectively improved.

The manufacturing method comprises the following steps that S1, raw materials, organic auxiliaries and pure water are subjected to slurry preparation in a ball milling tank according to the proportion, and a boat support splitting part blank is obtained through a slip casting technology; performing natural drying and hot air drying on the green body to discharge moisture, and then fettling and carving the green body into a boat support splitting part semi-finished product meeting the size requirement; s2, putting the semi-finished product in S1 into an induction furnace, purifying and sintering at a high temperature of 2000-2300 DEG C under the protection of inert gas, and obtaining a silicon carbide boat support splitting part biscuit containing a small amount of free carbon after high-temperature purifying and sintering; and S3, splicing the silicon carbide boat support splitting part biscuits, feeding the spliced whole boat support into a vacuum furnace, carrying out high-temperature siliconizing sintering treatment at 1650-1700 DEG C, and carrying out grinding, sand blasting, fine cleaning, impurity removal, ultrasonic cleaning and drying process treatment after discharging to obtain the low-iron-content boat support.

The invention discloses an efficient refining method for red impure copper. The efficient refining method comprises the following steps: (1) preparing calcium-cerium composite oxide powder; (2) preparing boron-phosphorus doped powder; (3) preparing a refining auxiliary agent; (4) red impure copper is put into a crucible, a medium-frequency induction furnace is adopted for heating and melting the red impure copper into a melt, the melt is covered with charcoal after being completely melted, the temperature of the melt is kept at 1110-1120 DEG C, then the refining auxiliary is added, and the mass ratio of the refining auxiliary to the melt is (3-4) kg: 1 t; and after charging, stirring the melt at a constant temperature of 1110-1120 DEG C for 10 minutes, then standing for 15 minutes, deslagging, casting and molding to obtain the refined impure red copper. After refining through the method, the tensile strength and the electric conductivity of the impure red copper can be remarkably improved, and the use performance of the impure red copper is improved.

The invention provides a method for preparing a copper ingot through waste copper refining, and belongs to the field of waste copper refining. The method comprises the following steps: sorting, crushing and drying a waste copper raw material to obtain a pretreated copper material; feeding the pretreated copper material into a cored power frequency induction furnace for melting; after the pretreated copper material is completely molten, adding a slag removing agent into the melt, then lowering the voltage, and salvaging slag after heat preservation; a magnetic refining agent is added into the melt obtained after slag fishing, stirring is carried out to adsorb impurity elements in the melt, then heat preservation and standing are carried out, and the magnetic refining agent is recycled; the refined melt is subjected to electromagnetic stirring and ultrasonic wave cooperative treatment, so that hydrogen and oxygen gas is deeply removed, and components are homogenized; and a slag conglomeration agent is added into the purified melt, stirring is conducted, slag is fished out after heat preservation, and casting is conducted to form an ingot. Therefore, deep and efficient removal of various types and trace harmful impurities (especially As, Pb, Sb and the like) in the waste copper is synergistically realized, and the metallurgical quality of final copper ingots is synchronously improved.

The invention provides a high-strength niobium alloy processing method, which relates to the technical field of alloy processing, and comprises the following steps: step 1, ingot casting preparation: niobium, tungsten, tantalum, molybdenum, zirconium and carbon are subjected to powder mixing and ingot casting to obtain a first alloy product; step 2, extrusion processing: heating the first alloy product by adopting a medium-frequency induction furnace, and carrying out extrusion treatment by adopting an extrusion ingot supply device to obtain a second alloy product; step 3, forging: performing intermediate annealing treatment on the extruded second alloy product twice by adopting a first annealing process in the forging process to obtain a third alloy product; wherein free forging treatment is carried out on the alloy product between the two times of intermediate annealing treatment; and (4) finished product processing: carrying out finished product annealing treatment on the third alloy product by adopting a second annealing process to obtain the final high-strength niobium alloy. Wherein in the second annealing process, the temperature is increased to 1200-1450 DEG C at the speed of 18-20 DEG C / min, and heat preservation is conducted for 60-120 min. According to the scheme, the strength of the niobium alloy can be improved.

The invention discloses a high-thermal-conductivity Mg-Zn magnesium alloy suitable for rheoforming and a preparation and processing method of the high-thermal-conductivity Mg-Zn magnesium alloy. The alloy comprises the following components in percentage by weight: 1-8% of Zn, 0.5-5% of Cu, 0.2-2% of Sn, 0.2-1% of Sc and the balance of Mg and inevitable impurities. The preparation and processing method comprises the following steps: (1) preparing raw materials according to the composition of the alloy components, and smelting by adopting a medium-frequency induction furnace and taking mixed gas of tetrafluoroethane and argon as a protective atmosphere; (2) mechanical stirring and ultrasonic synergistic stirring are combined to form a uniform melt; (3) preparing semi-solid slurry with a solid phase ratio of 35-50%; (4) forming; (5) cooling and opening the mold; (6) the obtained rheoforming blank is heated to 340-430 DEG C, heat preservation is conducted for 2-12 h, and after heat preservation is finished, quenching is conducted immediately, and cooling is conducted to the room temperature; (7) pre-aging; and (8) aging. By reasonably designing alloy components and optimizing rheoforming parameters, the defects of shrinkage, hot cracking and segregation of a conventional cast Mg-Zn alloy are overcome, and meanwhile, high heat conductivity and mechanical properties are guaranteed.

The invention belongs to the technical field of induction heating, and discloses a general induction heating system based on parametric simulation and an implementation method thereof, and the general induction heating system comprises an induction heating furnace system model, a simulation platform, a sensor and monitoring module and a control unit; the induction heating furnace system model comprises an induction furnace system and a crucible system, modeling is carried out on the induction furnace system through the simulation platform, and an alternating magnetic field is generated; modeling the alternating magnetic field and the crucible system through a simulation platform, and simulating heat energy generation and temperature change caused by eddy current; the sensor and monitoring module is used for detecting heat energy and temperature and transmitting data to the control unit; and the control unit is used for debugging parameters of the induction heating furnace system model, and then operating the induction heating furnace system model through the simulation platform to obtain optimal parameters and corresponding optimal heat energy generation and temperature change.

The invention discloses a medium-frequency induction furnace electric leakage detection system based on state analysis, relates to the technical field of electric leakage detection, and solves the technical problem that in the prior art, electric leakage detection of an induction furnace cannot perform data analysis and comparison on a current installation position and a historical first-time installation position. Specifically, the electric leakage detection platform is in communication connection with an electrical state evaluation unit, an electrical parameter influence detection unit and an installation position preset distinguishing analysis unit. The induction furnace monitoring end carries out data acquisition on the induction furnace and sends the acquired data to the electric leakage detection platform; after the electric leakage detection platform generates a position distinguishing analysis signal, an installation position presetting distinguishing analysis unit carries out distinguishing analysis on the current position, and whether the position has operation influence or not is judged according to installation position data collection and analysis; the electrical state evaluation unit evaluates the real-time electrical state of the induction furnace; and after the electrical state evaluation is completed, the electrical parameter influence detection unit performs electrical parameter influence detection on the induction furnace.

A preparation method for high-nitrogen austenitic stainless steel. The high-nitrogen austenitic stainless steel comprises the following chemical components in percentages by weight: carbon: ≤0.02%; silicon: 0.4-0.8%; manganese: 10.2-12.5%; chromium: 24.5-26.5%; nickel: 13.5-16.5%; molybdenum: 3.2-4.8%; nitrogen: 0.75-0.95%; phosphorus: ≤0.03%; sulfur: ≤0.0025%; vanadium: 0.016-0.022%; niobium: 0.026-0.034%; copper: 0.2-0.35%; aluminum: 0.01-0.02%; cerium: 0.015-0.025%; and the balance of iron and inevitable impurities. The preparation method comprises the steps of raw material charging, vacuum melting, refining, nitrogen-added alloying, deoxidation and desulfurization, casting, electroslag remelting, and secondary casting. The preparation is implemented by using the processes of smelting in a pressurized induction furnace and electroslag remelting under a protective atmosphere; and nitrogen is added by using a method in which a nitrogen alloy and pressurized nitrogen permeation are combined.

The invention discloses a high-toughness wear-resistant steel ball and a preparation method thereof, and belongs to the technical field of wear-resistant alloy steel. A medium-frequency induction furnace is used for smelting molten steel, and waste steel, a carburant, ferrochrome, ferrosilicon, metal aluminum and nitrided ferromanganese serve as main furnace charges. The method comprises the following steps: after the molten steel is subjected to slagging-off and standing, when the temperature is reduced to 1518-1533 DEG C, pouring the molten steel on a continuous casting machine to form a round steel bar with the diameter phi of 90-100mm, putting the round steel bar into a heating furnace for heating, after the round steel bar is uniformly heated to 1180-1250 DEG C and is subjected to heat preservation for 45-60 minutes, cutting the round steel bar into steel sections, controlling the length of the steel sections to be 180-225mm, then forging the steel sections into steel balls, and carrying out hot rolling on the steel balls to obtain the steel balls. And the steel balls are subjected to quenching and tempering treatment, so that the steel balls with high strength and hardness and good toughness and wear resistance are obtained, and the steel balls are applied to large mills, have good use effects and have good economic and social benefits in popularization and application.

The invention belongs to the technical field of induction furnace intelligent control, and discloses a non-vacuum induction furnace power supply system optimization method based on an improved PSO algorithm. The method comprises the following steps: establishing a basic principle and a heat transfer theory of non-vacuum induction furnace smelting, and according to an energy conservation principle, taking power supply parameters of each stage of an induction furnace as decision variables, on the premise of ensuring that molten steel with qualified temperature is obtained, taking electric energy minimization as an optimization target, and increasing necessary constraints in an actual production process; establishing a mechanism-based non-vacuum induction furnace power supply system optimization model, and calculating power supply parameters by adopting an improved PSO (Particle Swarm Optimization) algorithm; the power supply parameters comprise power, duration and power change rate. According to the method, power supply parameter optimization is more accurate, inertia weights can be dynamically adjusted along with the smelting energy balance state corresponding to the power supply parameters (weight attenuation is slow when errors are large, and weight attenuation is fast when errors are small), and the situation that traditional PSO weights are fixed or only attenuated linearly is avoided.

The invention discloses an extrusion production method of a boron-containing seamless steel pipe for shielding nuclear power fuel neutrons. The extrusion production method comprises blank extrusion preparation procedures such as blank outer diameter selection and surface treatment, saw cutting, deep hole, horn mouth and arc machining. The heating temperature and the heating time of a preheating section, a heating section and a soaking section of the annular furnace are set; induction furnace heating: setting the heating temperature, the heating power and the heating time of a primary induction furnace and a secondary induction furnace; the deformation process comprises chambering and extruding, and chambering deformation is a pre-chambering process of extruding deformation. A newly designed tool and die participating in deformation comprises the design of a broaching cone, and the diameter, the cone angle and other key dimensions of the broaching cone are stipulated; design contents such as the diameter of a working belt of the shearing ring and tolerance fit of the outer diameter of the shearing ring are stipulated in the shearing ring design. Through the steps and the design of tools and dies, the seamless steel pipe with the quality meeting the standard requirement is successfully produced on an extruding machine through the material.

The utility model belongs to the technical field of casting machining, and particularly relates to a medium-frequency induction furnace for casting machining, which comprises a furnace shell and supporting legs, the supporting legs are fixedly connected to the lower side of the furnace shell, an electric heating wire is fixedly connected to the outer side of the furnace shell, and machining mechanisms are connected to the inner end and the outer end of the furnace shell. The machining mechanism comprises dismounting units and a maintenance unit, the dismounting units are arranged at the inner end and the outer end of the furnace shell, and the maintenance unit is arranged at the outer end of the furnace shell. When the medium-frequency induction furnace for casting machining is used, after raw materials for casting machining are poured into the furnace lining, the furnace cover is rotated to the upper end of the furnace shell, then a rotating handle is rotated to drive a threaded rod to rotate and move downwards at the same time till the lower end of the threaded rod moves into a threaded groove in the upper portion of the front end of the furnace shell, and the furnace cover is fixed to the upper end of the furnace shell; and then the electric heating wires are electrified, and heat generated by the electric heating wires penetrates through the furnace shell and the furnace lining to heat the furnace shell and the furnace lining.

The utility model relates to the technical field of nickel base alloy smelting, and provides a nickel base alloy induction smelting feeding device which comprises a shell, an access door is fixedly connected to the upper end of the front face of the shell through a hinge, connecting bases are fixedly connected to the two sides of the bottom end of the shell, and a discharging hopper is fixedly connected to the top end of the shell. The device comprises a shell, fixing plates are fixedly connected to the upper ends of the two sides of the inner wall of the shell, servo motors are fixedly connected to the two sides of the back face of the shell, and the output ends of the servo motors extend into the shell and are fixedly connected with pressing rollers through couplings. And the elastic force of the reset spring is utilized to enable the positioning block to slide and be clamped into the proper positioning groove, so that the overall height of the outer discharging pipe and the inner discharging pipe can be changed, the mounting requirements of different induction furnace feeding ports are met, the complexity and inconvenience that the height needs to be adjusted and heightened due to different heights of the induction furnace feeding ports are avoided, and the applicability is improved.

The invention discloses a wear-resistant hypereutectic high-chromium cast iron composite roller and a preparation method thereof, and belongs to the field of rollers. Firstly, waste steel, a carburant, high-carbon ferrochrome, ferromanganese and ferrosilicon are mixed, heated and melted in a medium-frequency induction furnace, when the temperature of molten iron reaches 1523-1547 DEG C, the molten iron is discharged out of the furnace and placed into a casting ladle, aluminum-magnesium alloy is put into the bottom of the casting ladle in advance, and the adding amount of the aluminum-magnesium alloy accounts for 0.25-0.30% of the mass fraction of the molten iron entering the casting ladle. The wear-resistant hypereutectic high-chromium cast iron roller sleeve is produced by adopting a centrifugal casting method, the wear-resistant hypereutectic high-chromium cast iron roller sleeve and the medium-carbon low-alloy forged steel roller shaft are subjected to hot charging and compounding into a whole, the wear-resistant hypereutectic high-chromium cast iron composite roller is obtained, and the wear-resistant hypereutectic high-chromium cast iron composite roller has the characteristics of simple and convenient process, high production efficiency, and the service life is prolonged by 40% or above compared with that of a high-nickel-chromium infinite cooling cast iron roller, and good economic and social benefits are achieved in application and popularization.

The application provides a structure Cu-containing Mo-V micro-alloy cast steel and a preparation method thereof. The cast steel material is composed of the following components in percentage of mass fraction: C: 0.06-0.13%, Mn: 1.3-1.9%, Si: 0.2-0.4%, Ni: 0.5-1%, Mo: 0.18-0.42%, V: 0.05-0.09%, and Cu: 0.25-0.65%. The method comprises the following steps: step one, adding a blank into an electric arc furnace or an induction furnace; step two, performing conventional smelting on the blank to obtain a molten steel with a required mass target component; step three, adjusting the temperature of a semi-finished cast steel and tapping the molten steel to obtain the cast steel; step four, performing heat treatment on the cast steel; and step five, judging the qualification of the cast steel to obtain a high-quality finished cast steel. Through the structure Cu-containing Mo-V micro-alloy cast steel and the preparation method thereof, the yield strength grade of the non-quenching + tempering type micro-alloyed precipitation strengthening type cast steel can be further improved, the low-temperature toughness of a large-size structure cast piece under a conventional process can be improved, and the cost consumption of the large-size structure cast piece under the conventional process can be reduced.

The invention belongs to the technical field of brazing materials, and particularly discloses copper-based brazing filler metal for CBN tool brazing and a preparation method and application of the copper-based brazing filler metal, the copper-based brazing filler metal comprises 15.0%-20.0% of manganese, 1.0%-3.0% of nickel, 1.0%-1.8% of chromium, 6.0%-9.0% of titanium and the balance copper, and the total amount of impurity elements is smaller than 0.3%. The preparation method comprises the steps that metal copper, metal manganese, metal nickel, metal chromium and metal titanium are placed in a vacuum medium-frequency induction furnace to be smelted, after the raw materials are smelted and mixed to be uniform, a refining agent is added for refining, and alloy melt is obtained; inert gas is adopted for conducting vacuum gas atomization treatment on the alloy melt, and alloy powder is obtained; and mixing the alloy powder with a dispersing agent at the temperature of 45-60 DEG C under the vacuum condition to obtain the copper-based alloy powder. The copper-based brazing filler metal has the advantages of being high in purity, high in apparent density, low in melting point, good in wettability, higher in bonding strength, good in hardness and abrasion resistance and the like.

The invention belongs to the technical field of solid waste resource recovery and metallurgy, and particularly relates to a method for efficiently enriching platinum group metals by using a copper trapping waste automobile exhaust catalyst, which comprises the following steps of: completely mixing a mixture of a waste catalyst, a collecting agent, a proper amount of slag former and a reducing agent in a mixer; then, putting the mixed material into a crucible, and putting the crucible into a medium-frequency induction furnace or an electric arc furnace; the furnace is heated to a given temperature and maintained for a period of time. After smelting, Cu-PGMs alloy, flue gas and slag are obtained, and the PGMs can be enriched by 10-25 times through the method.

The invention relates to a thick and large-section nodular cast iron inoculation method based on a laminated slow-release inoculation block. The method comprises the following treatment steps that S1, raw materials are prepared; s2, the high-purity pig iron, the waste steel and the nodular cast iron foundry returns in the step S1 are put into an electric induction furnace to be smelted; s3, performing carbon and silicon testing on the molten iron subjected to slag removal in the step S2 by using a carbon and silicon analyzer, and adjusting components; s4, carrying out primary spheroidizing inoculation by adopting a pouring method; and S5, after spheroidizing inoculation is completed, molten iron is poured into a sand mold, a laminated slow-release inoculation block is placed in the sand mold for slow-release inoculation, and a thick and large-section spheroidal graphite cast iron casting is formed. The method has the advantages that slow-release inoculation is implemented in the cross gate, and molten iron continuously and slowly releases an inoculant in the pouring process through the laminated slow-release inoculation blocks. By means of the method, inoculation recession can be effectively inhibited, the graphite form is improved, and finally the density and the spheroidization rate of graphite nodules in the center of the thick and large-section nodular iron casting are increased.