218 results about "Ferrochrome" patented technology

The invention discloses an iron alloy electrode paste and a preparation process, and belongs to the technical field of electrode paste preparation, the iron alloy electrode paste comprises a composite aggregate system and a composite binder system, the composite aggregate system comprises the following components by mass: 40-60% of anthracite aggregate, 15-25% of artificial graphite flake, and 3-8% of silicon carbide whisker; the composite binder system comprises the following components in percentage by mass: 70-80% of medium-temperature modified coal pitch, 10-15% of furan resin and 5-10% of dispersion liquid containing nano boron carbide, and the composite binder system is combined with the composite aggregate system through a gradient permeation process to form a three-dimensional conductive network and an enhanced interface; the composite aggregate system and the composite binder system are optimally proportioned, and gradient permeation and gradient kneading processes are combined, so that the comprehensive performance of the electrode paste is remarkably improved, the thermal shock resistance is greatly improved and the linear shrinkage rate is reduced while low resistivity is maintained, the electrode paste is suitable for smelting ferroalloys such as silicomanganese and ferrochromium, and the service life is remarkably prolonged.

The invention relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

The invention discloses a high-carbon ferro-chrome smelting control method based on a submerged arc furnace, and relates to the field of high-carbon ferro-chrome smelting control, and the high-carbon ferro-chrome smelting control method comprises the following steps: constructing a three-dimensional temperature measurement network, generating temperature field distribution in the furnace based on three-dimensional space coordinates of all temperature measurement points, and further extracting boundary position coordinates and volume change trend of a molten pool; the method comprises the following steps: performing matching degree calculation on an electrode position impedance gradient curve and a molten pool boundary change trend to diagnose the structural stability of a crucible area, calculating the partial pressure ratio of key components based on hearth pressure, and comprehensively diagnosing the overall health state grade of the furnace condition in the furnace in combination with the structural stability state of the crucible area in the furnace; according to the diagnosed overall health state grade of the furnace condition, the proportion of the chromium ore, the coke and the flux is dynamically adjusted, accurate sensing of the multi-dimensional state in the furnace and grading diagnosis of the furnace condition are achieved, the problems of insufficient reduction of raw materials, waste of the chromium ore and the like can be avoided in time, and the product purity and the smelting stability are guaranteed.

The invention belongs to the field of comprehensive utilization of chromite, and particularly relates to a method for producing high-carbon ferrochrome through chromite pellet prereduction-electric furnace smelting. According to the method, a reduction method that a reducing agent and chromite pellets are fed into a kiln separately is adopted, chromite oxidized pellets are prepared firstly and then reduced through a rotary kiln solid carbon reducing agent, and the obtained pre-reduced pellets are subjected to electric furnace smelting with a calcium flux and a magnesium flux as slagging fluxes to prepare the high-carbon ferro-chrome. The problem that according to an existing method, the metallization rate of the pre-reduced pellets and the adverse effect on electric furnace smelting caused by unstable carbon residues are solved, the production stability of the electric furnace can be improved, and meanwhile the electric furnace smelting temperature can be increased. The method is simple, controllable, low in energy consumption, high in efficiency, high in stability, low in production cost and convenient for industrial application.

The invention relates to the technical field of flux-cored wires, and discloses a high-rust-resistance flux-cored wire preparation method which comprises the following steps of S1, raw material pretreatment, S2, powder adding and forming, S3, surface modification and S4, finished product inspection. Before work is started, a worker prepares raw materials including high-carbon ferrochrome, tungsten carbide, boron carbide, rare-earth metal oxide and ferromolybdenum powder, then grinding equipment is used for grinding the raw materials, then the ground powder is dried for 2-3 hours through equipment at the temperature of 100-150 DEG C, the dryness of the raw materials is guaranteed, and the raw materials are evenly mixed. The method comprises the following steps: firstly, preparing a flux-cored wire, then uniformly stirring by utilizing three-dimensional mixing equipment, and then mixing and proportioning according to different proportions according to a corrosion-resistant flux-cored wire, an acid-base-resistant flux-cored wire and a high-hardness high-temperature-resistant flux-cored wire, so that the welding wires with corresponding properties can be conveniently used according to different environments, and the maximization of the functionality of the welding wire is improved.

The invention provides a high-toughness austenitic stainless steel welding rod for 5Ni steel and a preparation method of the high-toughness austenitic stainless steel welding rod. The welding rod comprises a core wire and a coating coated on the surface of the core wire, and based on the total amount of the core wire, the core wire comprises the following components in percentage by mass: less than or equal to 0.09% of C, less than or equal to 0.15% of Si, 1.6-2.5% of Mn, 18.5-20.5% of Cr, 12.5-14.5% of Ni, 2.1-3.2% of Mo and 0.06-0.18% of Ti; 0.12-0.24% of Al, less than or equal to 0.007% of S, less than or equal to 0.008% of P, less than or equal to 0.006% of O, less than or equal to 0.001% of H, less than or equal to 0.012% of S + P, and the balance Fe and inevitable impurities. On the basis of the total amount of the coating, the coating comprises, by mass, 28-38% of carbonate, 15-20% of fluorite, 1-3% of lithium fluoride and sodium fluoride, 8-12% of synthetic mica, 3-6% of potassium silicotitanate, 2-4% of zircon sand, 9-15% of electrolytic manganese metal, 2-4% of ferrotitanium, 2-5% of passivated nickel-magnesium alloy, 1-3% of atomized ferrosilicon, 1-3% of lanthanum cerium fluoride, 1-3% of tungsten and molybdenum, 3-5% of nitrided ferrochromium and 1-2% of CMC. The welding rod is good in all-position welding controllability, extremely low in air hole sensitivity and excellent in low-temperature toughness, and can meet the requirements for high-quality and efficient welding of 5Ni steel.

The invention discloses an ultralow-temperature high-toughness non-magnetic steel flux-cored wire for a controllable nuclear fusion device and a preparation method of the ultralow-temperature high-toughness non-magnetic steel flux-cored wire. A special stainless steel strip is adopted to wrap a metal powder type flux core, and the flux core accounts for 29.6%-30.4% of the total mass of the flux-cored wire; the flux core comprises the following components: 14%-18% of electrolytic manganese, 21%-23% of chromium metal, 0.3%-1.0% of ferrotitanium, 4.4%-5.0% of nitrided ferrochromium, 27.5%-28.5% of nickel powder, 0.5%-1.0% of 52 # ferrosilicon, 8%-9% of molybdenum powder, 0.1%-0.3% of lithium fluoride and the balance of atomized iron powder. The problems that an existing non-magnetic steel welding material is insufficient in toughness and high in magnetic conductivity at the ultralow temperature of-269 DEG C are solved by optimizing flux-cored alloy elements of (nickel-chromium-nitrogen) synergistic stable austenite, matching with a manufacturing process of sealed baking and roller die drawing forming of powder at the temperature of 120-140 DEG C and a welding process protected by argon (Ar) with the purity of 99.999%. The AKV2 of a welded joint is larger than or equal to 34J at the temperature of-269 DEG C, the tensile strength is larger than or equal to 620 MPa, the relative permeability is smaller than or equal to 1.02, the problems that nitrogen of an existing solid welding wire is difficult to control, and hardening is easy can be solved, and the welding wire is completely matched with the extreme working condition of a controllable nuclear fusion device.

Novel high-carbon ferro-chrome vibration screening equipment belongs to the related technical field of mineral aggregate screening equipment and comprises a material flow dividing device, a flow dividing valve is arranged in the material flow dividing device, the material flow dividing device comprises a first flow dividing path and a second flow dividing path, and the flow dividing valve can be remotely controlled; the second flow dividing path is connected with the vibration screening device, the vibration screening device is used for receiving materials needing to be subjected to vibration screening and conducting vibration screening on the materials, and large-particle materials screened out by the vibration screening device are directly output to participate in production. And small-particle materials and / or powdery materials screened out by the vibrating screening device are / is conveyed to downstream equipment. The material distributing device is arranged, materials are distributed and then subjected to vibration screening treatment through the vibration screening device, and different screened materials are subjected to different follow-up treatment according to requirements, so that the utilization rate of high-carbon ferrochrome is increased, waste of small-particle powder in the high-carbon ferrochrome is avoided, and the production and operation cost is reduced.

This invention provides a high-hardness, crack-free flux-cored welding wire and its preparation method. The flux-cored welding wire includes an outer sheath and a flux core. By weight, the flux core comprises the following components: boron carbide 5.6-8.6 parts; 75% ferrosilicon 3.1-4.6 parts; electrolytic manganese 0.6-1.6 parts; 80% ferrovanadium 0.3-1.2 parts; nickel powder 0.3-1.0 parts; 68% high-carbon ferrochrome 67.5-94.5 parts; and iron powder 6-6.5 parts. The preparation method of the flux-cored welding wire is as follows: [The following components are listed:] boron carbide, 75% ferrosilicon, electrolytic manganese, 80% ferrovanadium... Ferrovanadium, nickel powder, 68% high-carbon ferrochrome, and iron powder are added sequentially to a dryer and dried for 2-3 hours. The mixture is then thoroughly mixed using a three-dimensional motion mixer and placed in an insulated box for later use. The outer sheath is placed on a forming machine, which rolls the outer steel strip into a U-shaped groove. Flux-cored powder is added to the U-shaped groove, and the forming machine closes and pulls the groove to obtain the flux-cored welding wire. The flux-cored welding wire of this invention features high hardness, no cracks, high temperature resistance, and corrosion resistance. Furthermore, the low production cost of the flux-cored welding wire facilitates industrial production.

The invention relates to a preparation method of a nickel-chromium-iron alloy consumable electrode, the consumable electrode and an alloy ingot. The method comprises the steps that an electrolytic nickel plate is subjected to vacuum melting under the condition that the vacuum degree is smaller than or equal to 0.67 Pa, after the electrolytic nickel plate is melted down, the vacuum degree is kept to be smaller than 2 Pa and lasts for 5 min to 10 min, and a nickel melt with the lead removal rate larger than or equal to 60% is obtained; pouring the nickel melt into a pure nickel electrode under a vacuum condition; combining the pure nickel electrode with industrial pure iron to form an iron-nickel composite electrode; with the iron-nickel composite electrode as a consumable electrode, ferrochrome is added into a lined electroslag furnace for smelting, and a high-temperature metal melt is obtained; the high-temperature metal melt is tapped to a steel ladle, and argon is blown to the bottom of the high-temperature metal melt in the steel ladle for 3-5 min; and the high-temperature metal melt obtained after bottom argon blowing is poured into the consumable electrode. According to the method, five types of fusible elements including Pb, Bi, Sn, As and Sb are systematically and gradually reduced to be extremely trace by coupling three steps of vacuum volatilization, deep electroslag separation and secondary ladle refining.

The invention provides a preparation method of a high-wear-resistance alloy lining plate, and relates to the technical field of wear-resistance alloys, carbon steel and pig iron are mixed, heated and melted, high-carbon ferromanganese, medium-carbon ferrochrome and ferrosilicon are added, heating refining is carried out, aluminum powder is added, the mixture is put into a mold, cooling and demolding are carried out, heating homogenization, quenching and cooling are carried out, and a mother plate is prepared; mixing bismaleimide, the composite powder and sepiolite fibers, heating and stirring, coating a mother board with the mixture, firstly applying negative pressure, then applying positive pressure, heating and cooling to obtain a substrate layer; and placing the mother board in magnetron sputtering equipment, sputtering on the substrate layer to obtain a chromium nitride functional layer, and cooling to obtain the high-wear-resistance alloy lining board. The composite powder is prepared by mixing and heating chromium carbide powder and a hydrogen peroxide solution, filtering, mixing with an ethanol solution and gamma-aminopropyltriethoxysilane, heating, condensing and refluxing, washing and drying, and mixing and heating with amine-terminated polyether and N, N-dimethylformamide. The wear-resistant stability of the alloy lining plate can be improved.

The utility model discloses an ingredient mixing device for smelting high-carbon ferro-chrome, belongs to the technical field of ingredient mixing for smelting high-carbon ferro-chrome, and aims to solve the problem of poor or non-uniform mixing effect caused by a fixed angle of a stirring blade in the conventional mixing device. The tension spring is compressed by pressing the shovel plate, at the moment, the inner wall of the round hole is attached to one end of the clamping plate, the partition plate is separated from the clamping plate, then the angle of the shovel plate can be automatically adjusted according to the number of powder, after the angle of the shovel plate is determined, the force for pressing the shovel plate is released, and the tension spring drives the shovel plate to reset; the partition plate is clamped into the stirring rod again, at the moment, the stirring angle is fixed by the shovel plate, and the effect of mixing uniformity of the ingredient powder is improved.

The application relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method thereof. The high-temperature-resistant flux-cored wire containing rare earth elements comprises a wire sheath and a core; the core comprises the following raw materials: dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, aluminiferous iron, potassium cryolite, potassium titanate, sodium titanate, iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, chromium-iron nitride, bismuth oxide, an additive, and the balance of reduced iron powder; the additive is a mixture of zirconium-iron alloy, ferrotitanium alloy and aluminum-magnesium alloy. The application introduces a specific alloy additive into the core to protect the transition of the rare earth yttrium, optimizes the welding performance of the yttrium and multiple components in cooperation, matches the 253MA heat-resistant steel, adjusts the components of the molten slag and the electric arc, and reasonably processes the technology, so that the welding quality of the wire is improved.

The invention discloses champagne rhinestones and a vacuum coating color changing method, and belongs to the technical field of rhinestones. The method comprises the steps that S101, a template is transferred, wherein rhinestones are transferred to the template; s102, bias plasma cleaning is conducted, specifically, the template is transferred to a coating chamber, vacuumizing and heating are conducted, and then bias plasma cleaning is conducted; s103, aluminum oxide layer plating: after vacuum cleaning, an aluminum oxide target material is adopted for vacuum coating to form an aluminum oxide layer, and the coating conditions are as follows: the current is 50-70 A, the time is 100-130 S, and the vacuum degree is 5.0-7.0 * 10 <-1 > Pa; in the step S104, oxygen is introduced, ferrochrome is adopted for vacuum coating to form the ferrochrome layer, and the coating conditions are that the current ranges from 50 A to 70 A, the time ranges from 220 S to 270 S, and the vacuum degree ranges from 7.5 * 10 <-1 > Pa to 9.0 * 10 <-1 > Pa; and S105, discharging is conducted, specifically, after cooling is conducted, air is introduced, and then the template is taken out of the coating chamber.

The utility model relates to the technical field of low-carbon ferrochrome smelting, and discloses a batching device for low-carbon ferrochrome smelting, which comprises a supporting table, a feeding assembly is arranged on one side of the supporting table, the feeding assembly comprises a feeding hopper and a stepping motor, a transmission rod is fixedly mounted on an output shaft of the stepping motor, and the transmission rod is connected with the feeding hopper. And a scraping strip is fixedly installed on one side of the transmission rod, a spiral conveying rod is fixedly installed at the bottom of the transmission rod, and a weighing assembly is arranged at the top of the supporting table. By arranging the weighing assembly and the weighing device, weighing can be conducted, so that quantitative materials are weighed, the electric push rod is controlled to stretch to push the material pushing plate, the connecting rod and the material blocking plate to move, the materials in the feeding box can be pushed into the feeding hopper, operation is easy, and discharging is convenient; wherein the transmission rod, the scraping strip and the spiral conveying rod can be driven to rotate by turning on the stepping motor, discharging is convenient, and wall sticking and blocking of materials can be prevented.

Electric heating device (10), with: a body (20); and a heating head (30) connected to the body (20) and comprising an electric heating wire (31) and a heat storage element (32), wherein the electric heating wire (31) has a first section (311) and a second section (312) with a proximal end connected to the first section (311), wherein the first section (311) is made of pure nickel and the second section (312) is made of ferrochrome, and wherein the heat storage element (32) is mounted around a radial outer circumference of the second section (312), and wherein the heat storage element (32) is made of china clay.

The invention discloses a directional solidification high-boron high-speed steel jet nozzle for oil field hydraulic power and a preparation method thereof, and belongs to the technical field of oil field exploitation equipment. The preparation method comprises the steps that raw materials such as electrical pure iron and micro-carbon ferrochrome are proportioned according to the specific mass fraction, and high-boron high-speed steel molten steel is obtained through vacuum melting; after the molten steel is subjected to rare earth aluminum desulfurization and temperature control, an as-cast blank is obtained through directional solidification treatment; and the cast blank is subjected to machining, austenitizing quenching, tempering heat treatment and fine polishing treatment, and a finished product is obtained. The finished product comprises a metal matrix and a directionally-arranged (Fe, Cr) 2B boride hard phase, alloy components are accurate and controllable, the hardness is 58.5-64.5 HRC, and the surface roughness is 0.25-0.40 mu m. The high-wear-resistance and high-brittleness high-wear-resistance and high-performance alloy nozzle has low cost and high performance, the problems that a traditional nozzle is poor in wear resistance, high in cost and large in brittleness are solved, the service life is remarkably prolonged, and the high-wear-resistance and high-brittleness high-wear-resistance and high-brittleness high-wear-resistance high-brittleness high-wear-resistance high-brittleness high-wear-resistance high-brittleness high-

The invention discloses a high-toughness wear-resistant steel ball and a preparation process thereof, and belongs to the technical field of metal wear-resistant materials. A medium-frequency induction furnace is used for smelting molten steel, firstly, waste steel, ferroniobium, a carburant and carbon ferrochrome are mixed, heated and melted in the electric furnace, ferrosilicon, ferromanganese and nitrided ferrochrome are sequentially added after the molten steel is melted down, and the chemical composition and mass fraction of the molten steel in the furnace are controlled to be 0.73%-0.86% of C, 1.08%-1.27% of Si, 2.25%-2.38% of Cr, 0.04%-0.07% of Nb, 0.03%-0.05% of N and 1.17%-1.30% of Mn, 1t; 0.045% P, lt; 0.040% of S, and the balance Fe and inevitable impurities. The molten steel is continuously cast into square billets, the square billets are rolled into round steel on a rolling mill, finally, the round steel is machined into steel balls through a rolling or forging method, and the steel balls are subjected to step quenching of water quenching, air cooling and fog cooling to obtain high hardness, excellent wear resistance and good obdurability.

The invention relates to the technical field of alloy materials, in particular to a hard alloy material for high-speed cutting and a preparation method thereof. The material comprises a hard phase and a binding phase, wherein the hard phase is tungsten carbide particles distributed in a bimodal mode, and a gradient diffusion layer is formed on the surface of the hard phase through a shell layer containing vanadium and chromium on the interface; and the binding phase is a multi-component alloy containing cobalt, chromium, iron, nickel, molybdenum and ruthenium. The preparation method comprises the following steps: carrying out dopamine pretreatment on tungsten carbide, carrying out pyrolysis on tungsten carbide and a metal organic precursor to form a shell layer, preparing binding phase powder, mixing and granulating, forming and dewaxing, sintering and carrying out hot isostatic pressing treatment. Abnormal growth of crystal grains is inhibited through the core-shell structure, high-temperature stability and interface bonding are enhanced through the multi-element binding phase, the material has high hardness, high toughness and thermal shock resistance at the same time, the wear resistance of a tool in high-speed cutting is remarkably improved, and the service life of the tool in high-speed cutting is remarkably prolonged.

The present application relates to the technical field of high-carbon ferrochrome preparation, and discloses a preparation method and system for controlling the purity of high-carbon ferrochrome, which comprises the following steps: obtaining a preparation batch of high-carbon ferrochrome to be controlled for purity and corresponding raw material categories and preparation equipment, querying operation and maintenance technical requirements of the raw material categories and the preparation equipment to determine purity influencing elements of the preparation batch; analyzing a reaction operation state of a production process to calculate purity fluctuation entropy corresponding to the purity influencing elements and analyze purity deviation of the preparation batch; analyzing reaction activity characteristics of the raw material categories to calculate a purity guarantee rate of the preparation batch; analyzing purity interference factors during production of the preparation equipment to determine a purity contribution rate of the production process of the preparation equipment; and performing purity control processing of the raw material categories in the preparation equipment to obtain a purity control result. The present application can improve the preparation efficiency of high-carbon ferrochrome purity.

The invention relates to the technical field of special low-carbon building materials, in particular to a salinized soil curing agent, a preparation method and application of the salinized soil curing agent to a roadbed, specifically, air-cooled high-carbon ferrochrome slag powder is adopted as a main raw material, and active micro powder is prepared by treating red mud, phosphorus slag powder and magnesite tailing powder; and reinforcing waste gypsum and steel slag powder are added as main active substances, and a large amount of stone powder is added, so that the salinized soil curing agent with excellent mechanical properties, good seawater resistance and high solid waste utilization rate is prepared.

1. The name of the design product: intelligent welding platform (T16). 2. The use of the design product: the design product is used to place electric chrome iron and control welding. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective drawing.

The present application belongs to the technical field of stainless steel smelting, and particularly relates to a method for smelting 310S stainless steel based on low-grade nickel-iron alloy. The method comprises the following steps: S1, pouring low-grade nickel-iron melt into No. 1 AOD furnace, resetting No. 1 AOD furnace for blowing, and obtaining first enriched nickel-iron melt; S2, entering blowing period; S3, entering screening furnace period; S4, pouring the enriched high-grade nickel-iron melt into a clean ladle for standby, then pouring chromium-iron melt into No. 2 AOD furnace which is fully roasted, and finally pouring the high-grade nickel-iron melt into the chromium-iron melt to form 310S mother liquor, and starting smelting; S5, entering steel-making period; S6, entering oxidation-reduction period; S7, entering refining period; S8, after soft blowing and slag breaking, deep deoxidation is performed to purify the steel melt; and S9, continuous casting. The smelting process can greatly reduce the cost per ton of steel, and can also fully meet the requirements of 310S stainless steel products on nickel, phosphorus and sulfur contents.

The invention discloses a method for preparing an iron-chromium-cobalt alloy by using cobalt slag and ferrochrome slag, and belongs to the technical field of metallurgy and comprehensive utilization of resources. According to the method, zinc hydrometallurgy byproduct cobalt slag and ferrochrome alloy smelting byproduct ferrochrome slag serve as main raw materials, aluminum blocks and lime are matched, after drying, crushing, fine grinding and mixing are conducted, an aluminothermy self-propagating reduction reaction is triggered through electric auxiliary heating, high-temperature smelting is conducted at the temperature larger than or equal to 1500 DEG C, and finally the ferrochrome cobalt alloy is obtained through slag-metal separation and casting forming. According to the method, high-valued utilization of the dangerous waste residues is achieved, the process is simple, cost is low, energy consumption is low, the obtained alloy is low in carbon content and excellent in magnetic performance (residual magnetism is not smaller than 1.365 T, coercive force is not smaller than 48.63 kA / m, and magnetic energy product is not smaller than 48.26 kJ / m < 3 >), and the method is suitable for the field of permanent magnet materials and related high-end manufacturing.

This invention belongs to the field of ferroalloy smelting technology and industrial process control technology. Specifically, it discloses an intelligent smelting method for high-carbon ferrochrome alloys based on a submerged arc furnace. The method includes: generating a comprehensive material surface state map by collecting material surface state and temperature data; analyzing the overall spatial distribution pattern of grid cells based on the state map to diagnose the overall furnace condition; triggering corresponding global control commands if abnormalities are found; and comparing the material surface sinking height, raw material sinking speed, current temperature, and temperature change rate of each grid cell with preset evaluation criteria to diagnose local furnace conditions if the overall furnace condition is healthy. For healthy cells, precise quantitative material replenishment is calculated when the sinking height meets the standard, and the replenishment azimuth angle is determined through polar coordinate transformation. For abnormal cells, differentiated local control commands are triggered based on their abnormal characteristics. This invention achieves closed-loop intelligent control of the submerged arc furnace smelting process from global perception to precise local control, effectively improving smelting efficiency.

The invention discloses a high-hardness wear-resistant flux-cored wire for open arc surfacing of coal mine machinery, which belongs to the technical field of welding materials and consists of flux-cored powder and a carbon steel strip. The flux core powder comprises the following raw materials of 20%-80% of high-carbon ferrochrome, 1%-8% of high-carbon ferromanganese, 1%-10% of graphite, 1%-5% of ferrotitanium, 1%-5% of silicon carbide, 0.5%-4% of boron carbide and 0.1%-2% of cryolite. The welding wire is applied to repairing of the chain wheel of the scraper conveyor of the coal mine, the service life is 2.3 times that of a common welding wire, and the comprehensive cost is reduced by 40%.

A medical device that is partially or fully formed of a metal alloy; the metal alloy includes one of a) metal alloy that includes at least 15 awt % rhenium, b) at least 60 wt. % tungsten, at least 15 awt % rhenium, and at least 1 wt % molybdenum, c) at least 50 wt. % rhenium, at least 20 wt. % chromium, and 0.1-80 wt. % of an additive, d) greater than 50 wt. % titanium, 15-45 wt. % niobium, 1-10 wt. % zirconium, and 1-15 wt. % tantalum, e) greater than 50 wt. % titanium, 15-45 wt. % niobium, and 1-10 wt. %, f) 30-60 wt. % cobalt, 10-30 wt. % chromium, 5-20 wt. % iron, 5-22 wt. % nickel, and 2-12 wt. % molybdenum, g) 40-60 wt. % zirconium, and 40-60 wt. % molybdenum, h) 90-99.5 wt. % niobium, and 0.5-10 wt. % zirconium, or i) 55-75 wt. % niobium, 18-40 wt. % tantalum, 1-7 wt. % tungsten, and 0.5-4 wt. % zirconium.

The invention relates to the technical field of coating materials, in particular to a black refractory coating as well as a preparation method and application thereof. The black refractory coating comprises the following raw material components: perovskite type black ceramic, ferrochrome spinel, silicon carbide and refractory cement. The black fireproof coating has excellent high-temperature stability, can achieve a high energy-saving effect, and is low in cost and simple in preparation process. By utilizing the technical scheme provided by the invention, the problems of poor high-temperature stability, small adhesive force and high cost of the black fireproof coating in the prior art are effectively solved.

The invention discloses a workflow-based metallurgical production process state tracking method and device, and the method comprises the steps: executing a predefined metallurgical production process composed of a plurality of sequential nodes; in the process execution process, receiving a node completion event from a process engine, a user operation event from an operator and a state updating event from an external monitoring system; and in response to any received event, according to a preset event-state mapping rule, state information of a plurality of associated production elements in the state database is updated in a linkage mode, and the production elements comprise an iron ladle, a transport vehicle, an AOD furnace, a nickel-iron furnace and a chromium-iron furnace. According to the method, the workflow node driving and the multi-source event triggering are combined, so that the real-time, automatic and linkage tracking of the state of the key equipment in the whole metallurgical production process is realized, the defects of information isolated island and state lag in a traditional mode are effectively overcome, and the effectiveness of production scheduling and the refinement level of process management and control are remarkably improved.

This invention discloses a preparation process for high-carbon ferrochrome based on plasma spheroidization technology, belonging to the field of powder metallurgy. The process involves crushing and ball milling high-carbon ferrochrome blocks to obtain pre-formed powder, adding tannic acid, urea, nickel acetate tetrahydrate, and citric acid for coating, followed by spray drying. After pre-reduction carbonization in an argon-hydrogen atmosphere, the powder is then spheroidized using a radio frequency inductively coupled plasma torch. In-situ nanostructure growth is achieved in a mixed atmosphere of argon, hydrogen, and acetylene. Nickel acetate is reduced to catalytically active elemental nickel nanoparticles under the action of hydrogen and carbon monoxide. The powder is then cooled, graded, and inertly encapsulated to obtain a high-sphericity, low-oxygen-content, high-carbon ferrochrome-based core-shell structured spherical powder. The process flow of this invention is continuous and controllable, effectively improving powder flowability, bulk density, hardness, and corrosion resistance, and is applicable to additive manufacturing, thermal spraying, and powder metallurgy forming.