80 results about "Ferrotitanium" patented technology

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 relates to the technical field of welding materials, in particular to a titanium carbide reinforced iron-based wear-resistant corrosion-resistant flux-cored wire for surfacing on the surface of a conveying roller. According to the specific technical scheme, the flux core comprises, by mass, 10%-20% of graphite, 25%-35% of ferrotitanium, 2%-6% of ferrovanadium, 3%-8% of electrolytic manganese metal, 2%-10% of ferromolybdenum, 5%-15% of ferrosilicon, 2% of aluminum-magnesium alloy and the balance Fe powder. According to the flux-cored wire prepared through the flux core, the surfacing alloy obtained through electric arc surfacing is good in surfacing manufacturability, attractive in weld joint forming and small in surface air hole number, and the flux-cored wire has high hardness, high-temperature abrasion resistance and corrosion resistance.

The invention provides a flux-cored wire, a manufacturing method of the flux-cored wire, a gas-shielded arc welding method and deposited metal. The flux core of the flux-cored wire comprises the following components in percentage by weight: 27.5 to 29.5 percent of rutile, 1.0 to 2.0 percent of ferrovanadium, 0.2 to 0.3 percent of bismuth oxide, 0.8 to 1.2 percent of cryolite, 12.5 to 15.0 percent of high-carbon ferrochrome, 5.0 to 6.5 percent of electrolytic manganese metal, 4.5 to 6.5 percent of metal nickel, 1.0 to 3.0 percent of feldspar, 1.5 to 2.5 percent of ferromolybdenum, 1.0 to 2.5 percent of aluminum-magnesium alloy, 32.0 to 35.0 percent of micro-carbon ferrochrome, 0.5 to 1.5 percent of ferrotitanium, 1.15 to 2.85 percent of fluorite, 0.8 to 2.0 percent of ferrosilicon and 0.6 to 1.5 percent of lithium carbonate. In the invention, the alloy content of deposited metal and the hardness of the surfacing layer are controlled by adjusting the percentage of the flux core in the total weight, the surfacing layer with excellent corrosion resistance and proper hardness is ensured to be obtained, and the service life of the wrapper roller is prolonged. And meanwhile, by controlling all the components in the flux powder of the flux-cored wire and the proportion, the flux-cored wire has excellent welding process performance.

The invention discloses a method for synergistically extracting vanadium oxytrichloride, gallium trichloride and iron-titanium alloy from vanadium slag, and belongs to the field of recycling of complex multi-metal resources. The method comprises the following steps: uniformly mixing the gallium-containing vanadium slag, carbon and chlorinated waste salt according to a certain proportion, and carrying out vacuum melting treatment to obtain a Fe-Ti alloy; then chlorine is introduced for chlorination treatment, and a gaseous product is obtained; the gaseous product is adsorbed by a molecular sieve with a function of selectively adsorbing VOCl3 to obtain VOCl3, and then GaCl3 is obtained through a cold trap. According to the method, efficient collaborative conversion and recovery of multi-metal resources of vanadium, gallium, iron and titanium in the vanadium slag are achieved, and the problems that multi-metal collaborative extraction in existing vanadium slag is difficult, and the separation efficiency is low can be effectively solved.

The invention discloses a method for improving the toughness performance of low-alloy high-strength steel by adding rare earth cerium-iron alloy and application of the method, and belongs to the technical field of steel rolling and product development. According to the method, narrow window control is conducted on converter steelmaking, LF refining and RH vacuum treatment in an existing wide and thick plate low-alloy high-strength toughness steel production technological process, a cerium-iron alloy is added after alloying in the RH vacuum treatment process is finished and circulated, temperature measurement and oxygen determination are conducted before the cerium-iron alloy is added, and the active oxygen is smaller than or equal to 3 ppm. The method is applied to an RH vacuum treatment step of industrial production of wide and thick plate Q690E steel and comprises the following steps: adding a titanium-iron alloy and a ferroboron alloy in sequence for alloying, circulating after alloying is finished, and adding a cerium-iron alloy; and carrying out soft blowing after the RH vacuum treatment is finished. After the rare earth cerium-iron alloy is added, the average size of low-alloy high-strength steel inclusions is remarkably reduced, the average grain size is greatly small, the average width of a martensite lath bundle is narrowed by less than 200nm, and the toughness performance is remarkably improved.

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.

The invention relates to the technical field of steel smelting, in particular to a pipeline steel plate for a hydrogen embrittlement-resistant high-pressure pure hydrogen conveying pipeline and a smelting method of the pipeline steel plate. The smelting process comprises the steps of converter smelting, CAS refining, LF refining, RH refining and continuous casting. In LF refining, oxygen is determined after molten steel arrives at a station, silicon iron is added for deoxidation, and the oxygen content of the molten steel is stabilized to be 20-80 ppm; 0.10-0.35 kg of ferrozirconium is added for each ton of steel in the LF refining process, and 0.50-0.80 kg of ferrotitanium is added for each ton of steel after heating is conducted for 5-10 min. Under the equipment condition of a conventional smelting mode, through a special deoxidation mode without adding aluminum, ferrozirconium, ferrotitanium and rare earth alloy materials are added according to a specific process, and the whole process of the smelting process is optimized, so that the purity of molten steel is improved, the morphology of inclusions is improved, absorption and diffusion of hydrogen are inhibited, and a structure refining and hydrogen trap system is stably formed; the prepared pipeline steel plate shows higher hydrogen embrittlement resistance in a high-hydrogen environment, and is particularly suitable for long-term service requirements in high-pressure, variable-load and water-containing hydrogen environments.

The invention provides a process method for producing ferrotitanium powder by reducing ilmenite, which comprises the following steps of: uniformly mixing ilmenite concentrate with a biomass-coal mixed reducing agent, a nanoscale additive and the like, reducing in a rotary kiln under a temperature-controlled and oxygen-controlled atmosphere, quenching and cooling a product by water, and performing multi-stage ore grinding magnetic separation to obtain metal iron particles and a titanium-rich material; and preparing the two into a ferrotitanium powder product. The process integrates innovative units of raw material homogenization pretreatment, biomass-coal mixed reducing agent dynamic proportioning, LIBS + Raman spectrum on-line monitoring closed-loop control, nano CaO-Na2O composite catalyst buffer addition, finished product multistage magnetic separation reforming and the like. The product composition fluctuation is obviously reduced, the TiO2 content fluctuation is controlled within + / -0.4%, the FeO content fluctuation is controlled within + / -0.5%, the metallization ratio is improved to 90% or above, the heat efficiency is improved by about 20%, and the energy consumption per unit yield is reduced by about 15%. The ilmenite is directly, efficiently and cleanly utilized, a high-quality titanium-rich raw material can be provided for production of titanium dioxide, titanium sponge and the like, meanwhile, the byproduct high-grade iron powder is used for steelmaking, and the comprehensive utilization benefit of resources is remarkable.

The invention belongs to the field of metal material modification and roller manufacturing, and particularly relates to a production method of a double-element alloying modified carbide high-chromium cast iron roller for rod and wire rolling. Paving ferrotitanium at the bottom of a ladle, smelting molten iron on the outer layer of the roller by adopting an intermediate frequency furnace, and discharging when the components reach the standard and the temperature of the molten iron reaches 1460 + / -20 DEG C; after the molten iron subjected to titanium alloying treatment is subjected to slagging-off treatment at a tapping station, Ce particles are packaged in a hollow iron sheet pipe, the hollow iron sheet pipe is inserted into the molten iron after the two ends of the hollow iron sheet pipe are closed, and mechanical stirring is conducted for 1-3 minutes; and when the temperature of the molten iron subjected to Ti and Ce double alloying is reduced to 1440-1450 DEG C, the molten iron is poured into a rotating mold at a constant speed for centrifugal pouring. The size and distribution of carbides are modified mainly through double-element alloying, the abrasion resistance of the slitting roller is improved, the protection effect of a matrix on the carbides is enhanced, the toughness of a slitting blade is improved, the tipping occurrence rate is reduced, and therefore the rolling efficiency 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 utility model discloses magnetic separation equipment for ferrotitanium powder production, relates to the technical field of magnetic separation devices, and aims to solve the technical problems that a direct flow channel of the current magnetic separation equipment is low in adsorption efficiency, the separation quality is influenced, materials are easy to remain in the direct flow channel, and the current magnetic separation equipment is inconvenient to clean. A support is fixed to the outer side of the barrel, the base mechanism is installed at an opening in the lower end of the barrel and is composed of a bottom barrel and a drainage pipe, the drainage pipe is installed in the middle of the bottom barrel in a penetrating mode, the storage disc is installed on the inner side of the bottom barrel in a clamped mode, a pipe clamping opening is formed in the middle of the storage disc, and the pipe clamping opening is in butt joint with the drainage pipe. The driving mechanism is installed at the top end of the interior of the barrel and composed of a feeding barrel and a connecting shaft. The utility model has the advantages that the roundabout feeding channel is matched with the magnetic structure for all-directional adsorption separation, the separation quality is ensured, the material residue is avoided, and the cleaning is convenient.

The utility model discloses a ferrotitanium powder raw material feeding lifting device, relates to the technical field of ferrotitanium powder raw material conveying, and aims to solve the technical problems, the ferrotitanium powder raw material feeding lifting device comprises a conveying pipe, a feeding mechanism and a reducing mechanism, the feeding mechanism and the reducing mechanism are arranged on the conveying pipe, a conveying fan is arranged at the initial end of the conveying pipe, and a lifting pipe is arranged at the tail end of the conveying pipe. The reducing mechanism comprises an adjustable reducing pipe and a discharging pipe, the adjustable reducing pipe comprises arc-shaped plates arranged in an array mode, the lower portions of the arc-shaped plates are rotationally connected with the inner wall of the lifting pipe, an electric push rod is arranged on the upper portion of the outer surface of the lifting pipe, and a piston rod of the electric push rod is connected with the upper portions of the arc-shaped plates; and the discharging pipe is arranged at the upper end of the lifting pipe. The ferrotitanium raw material powder conveying device is provided with an adjustable and variable-diameter pipeline structure, and has the advantages that the airflow speed can be effectively increased, the material carrying capacity is enhanced, the problem that ferrotitanium raw material powder slides downwards due to the gravity of the ferrotitanium raw material powder is effectively solved, and it is guaranteed that the materials are conveyed upwards continuously and stably.

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%.

The invention belongs to the technical field of high-value utilization of non-ferrous metal solid waste, and relates to a method for preparing high-purity vanadyl sulfate through calcification roasting countercurrent leaching extraction.The method comprises the steps that converter vanadium slag serves as a raw material, a calcification agent is added for roasting, and transformed vanadium slag is obtained; secondary countercurrent is conducted on the transformed vanadium slag, calcium sulfite is added in the leaching process, and reduced vanadium-containing acid leaching liquid is obtained; the leaching residues can be used for preparing ferrotitanium alloy products; vanadium and impurities are separated through the extraction circulation process of extraction, washing and reverse extraction, and the high-purity vanadyl sulfate electrolyte is prepared. According to the method, the converter vanadium slag is adopted as a raw material, and high-value utilization of the converter vanadium slag in the field of energy storage is achieved. And meanwhile, resource utilization of leaching residues obtained through secondary countercurrent leaching is achieved, and whole-process harmless treatment is achieved.

This invention relates to the field of steel bar production technology, specifically to a 400MPa grade hot-rolled ribbed steel bar and its preparation method, comprising the following steps: Step 1: Converter steelmaking, controlling the final carbon content to 0.07%-0.09%, and sequentially adding a composite deoxidizer, silicon-manganese alloy, and ferrotitanium to the ladle; Step 2: Continuous casting, using a crystallizer immersion nozzle protection casting process; employing a secondary cooling process; the superheat of the tundish is 10-15℃; Step 3: Heating, with the heating temperature controlled at 1000-1040℃; Step 4: Rolling, with an initial rolling temperature of 1000-1040℃ and a controlled rolling temperature of 900-950℃; Step 5: Cooling, with a controlled cooling temperature of 860-890℃; Step 6: Producing the finished product. This invention improves the titanium recovery rate, reduces smelting costs, and improves the mechanical properties of hot-rolled ribbed steel bars.

The present application belongs to the field of metal material modification and roll manufacturing, and particularly relates to a production method of a double-element alloying modified carbide high-chrome cast iron roll for bar and wire rod rolling. The ferrotitanium is laid on the ladle bottom, a medium-frequency furnace is used to smelt the outer layer molten iron of the roll, and the furnace is discharged when the composition reaches the standard and the molten iron temperature reaches 1460 DEG C + / - 20 DEG C; the molten iron treated by titanium alloying is subjected to slagging treatment at the tapping station, Ce particles are encapsulated in the hollow iron pipe, the both ends are closed and then inserted into the molten iron, and mechanical stirring is carried out for 1-3 minutes; when the molten iron after Ti and Ce double alloying is cooled to 1440-1450 DEG C, the molten iron is poured into the rotating mold at a constant speed for centrifugal casting. The present application mainly modifies the carbide size and distribution through double-element alloying, increases the wear resistance of the cutting roll, enhances the protection of the matrix to the carbide, improves the toughness of the cutting edge, reduces the occurrence rate of edge collapse, and thus improves the rolling efficiency.

The invention discloses a copper slag-derived ferrotitanium piezoelectric material which is prepared by the following steps: calcining copper slag at 500-700 DEG C, crushing and sieving the calcined product, mixing with titanium dioxide and starch, performing dry grinding on the mixture for 1-3 hours, and calcining at 500-700 DEG C in an inert atmosphere, thereby obtaining the copper slag-derived ferrotitanium piezoelectric material, the ferrotitanium piezoelectric material prepared by the method has the advantages of high specific surface area, multiple reaction active sites, good catalytic performance, stable structure and the like, can be used for activating persulfate to degrade tetracycline hydrochloride, is remarkable in catalyst removal effect, and has good application value and application prospect.

The invention discloses a high-wear-resistance steel ball manufacturing method and belongs to the field of wear-resistant materials. Molten medium-carbon steel and molten high-carbon steel are smelted, the molten medium-carbon steel is formed by smelting 81.6%-82.3% of 45 # steel cuttings, 9.5%-9.8% of nitrided ferromanganese, 8.0%-8.5% of ferrotitanium and 0.13%-0.16% of metal aluminum, and the molten high-carbon steel is prepared from 1.92%-2.07% of C, 2.44%-2.75% of Cr, 1.13%-1.36% of Si, 0.55%-0.74% of Mn, 0.16%-0.23% of B and 0.02%-0.06% of Al < lt >; 0.050% P, lt; 0.045% of S, and the balance Fe and inevitable impurities. The two kinds of molten steel are evenly mixed, subjected to external treatment, cast into a steel bar and then forged into a steel ball, and the steel ball has high hardness and excellent wear resistance after being subjected to quenching, subzero treatment and low-temperature tempering and has an excellent use effect when applied to a large mill.

The invention relates to the technical field of welding, and discloses an alkaline welding material with high arc stability and high impact absorbing energy and a preparation method thereof. The alkaline welding material comprises a steel core and composite mineral powder, and the composite mineral powder is pressed on the surface of the steel core through a binder. Or the alkaline welding material comprises a low-carbon steel skin and composite mineral powder, and the composite mineral powder is wrapped by the low-carbon steel skin through mechanical rolling; the composite mineral powder comprises, by mass, 30-35 parts of marble, 1.5-10 parts of calcium aluminate, 20-28.5 parts of fluorite, 1-2 parts of synthetic mica, 15-20 parts of iron powder, 5-7 parts of atomized ferrosilicon, 3-5 parts of medium carbon ferromanganese, 4-5 parts of ferrotitanium, 1-2 parts of titanium dioxide and 1-2 parts of sodium carbonate. The obtained alkaline welding material can reduce the melting point of slag, refine grains, improve the cleanliness of molten steel, reduce the fluoride content and ionization energy in the coating, and improve the impact absorbing energy and the arc length of the welding material.

The invention relates to the technical field of manufacturing of metal composite materials, and discloses a corrosion-resistant and wear-resistant bimetal composite cylinder liner which is prepared through the following steps that the inner wall of an outer-layer matrix steel pipe is pretreated and coated with an interface activation flux; raw materials containing waste steel, ferrochrome and the like are molten, ferrotitanium and ferroboron are sequentially added for alloying, then ferric oxide powder and metal yttrium are added for modification treatment, and inner-layer alloy liquid is obtained; the preheated outer-layer matrix steel pipe is placed in a rotating state, and the inner-layer alloy liquid is poured; and after the to-be-solidified pipe fitting is cooled to the room temperature, the pipe fitting is heated to the austenitizing temperature, heat preservation is conducted, and then isothermal quenching treatment is conducted. According to the method, interface oxides are effectively removed and firm metallurgical bonding is promoted by utilizing the interface activation flux; a core is formed through in-situ reaction of metal yttrium and ferric oxide so as to refine grains; and a lower bainite and retained austenite mixed structure is obtained through isothermal quenching, the comprehensive mechanical property of the cylinder sleeve is improved, and the service life of the cylinder sleeve is prolonged.

The invention relates to the technical field of welding materials, and particularly discloses a flux-cored wire special for roller repairing for a welding robot and a preparation method of the flux-cored wire. A roller repairing flux-cored wire special for a welding robot comprises an outer skin and flux core powder, and the flux core powder is prepared from, by mass, 14%-18% of rutile powder, 2%-5% of zircon sand, 6%-9% of dehydrated potassium feldspar, 3%-6% of fluoride, 4%-8% of potassium compounds or / and sodium compounds, 18%-25% of chromium powder, 3%-6% of molybdenum powder, 5%-8% of electrolytic manganese, 2%-4% of silicon iron, 1%-3% of ferrotitanium, 3%-5% of carbon black, 0.1%-0.6% of bismuth oxide and the balance iron powder. The flux-cored wire prepared in the invention shows excellent working stability in welding, and an obtained surfacing layer has high hardness, good low-temperature impact toughness and excellent wear resistance, and is intact in internal quality.

The invention belongs to the technical field of special flux-cored wires, and relates to a wear-resistant submerged arc flux-cored wire for repairing a hot-rolled pinch roll. A wear-resistant submerged arc flux-cored wire for repairing a hot-rolled pinch roll comprises a steel strip and flux core powder, and the flux core powder comprises, by weight, 40-50 parts of micro-carbon ferrochrome powder, 10-14 parts of high-carbon ferrochrome, 5-9 parts of ferromolybdenum, 2-4 parts of electrolytic manganese, 2-4 parts of ferrotitanium, 5-7 parts of ferrocolumbium, 5-7 parts of ferrovanadium, 3-5 parts of silicon-zirconium alloy, 1-2 parts of sodium fluoride, 2-4 parts of tungsten powder and 10-15 parts of nano WC. 0.5-1.5 parts of tantalum iron, 0.5-0.8 part of rare earth oxide and a plurality of atomized iron powder. The welding wire provided by the invention still keeps the hardness of more than HRC52 at the high temperature of 600 DEG C, has good high-temperature wear resistance and crack resistance, realizes synchronous improvement of the hardness and impact toughness of a surfacing finished product, realizes no crack when the single-pass surfacing thickness is greater than or equal to 6 mm, and is low in cost.

The invention provides a 90kg-grade ultralow-temperature high-strength steel welding rod and a preparation method thereof, and the welding rod comprises a core wire and a coating covering the surface of the core wire, the coating is prepared from, by weight, 35%-45% of marble, 15%-20% of fluorite, 3%-5% of silica powder, 2%-4% of rutile, 1%-2% of manganese metal, 1%-2% of ferrosilicon, 15%-20% of nickel metal, 5%-10% of ferrotitanium, 2%-5% of ferromolybdenum, 0.4%-0.8% of sodium alginate, 0.3%-0.9% of sodium carbonate, 0.2%-0.5% of lanthanum oxide and the balance iron powder. According to the welding rod, under the high channel temperature welding condition, the mechanical property of deposited metal can obtain high tensile strength in the welding state and the heat treatment state, and good low-temperature toughness is achieved.

The invention discloses a smelting method of weathering resistant steel SPA-H molten steel, and mainly solves the technical problems that the existing weathering resistant steel SPA-H molten steel is poor in castability, inclusions are difficult to control during smelting by using an argon blowing straight-up process, and the production cost is high. According to the technical scheme, the smelting method of the weathering resistant steel SPA-H molten steel comprises the following steps: (1) desulfurizing molten iron; (2) smelting by adopting a top-bottom combined blowing converter, and adding an alloy required by alloying of a copper element into the converter along with the scrap steel; 3) converter smelting process control; 4) converter smelting end point control; 5) converter tapping control; (6) refining in a molten steel argon blowing station to adjust the temperature of the molten steel to 1580-1595 DEG C; aluminum wires are fed into the molten steel; weak stirring is conducted on the molten steel fed with the aluminum wire, and the molten steel is slightly stirred for 5-6 minutes; and then adding a titanium-iron alloy, and continuing to slightly stir the molten steel for 2-3 minutes to obtain finished molten steel. The molten steel produced by the method is directly conveyed to a continuous casting machine for casting, and the number of continuous casting furnaces is larger than or equal to 12.

The invention relates to the technical field of physical and chemical detection, in particular to a method for detecting the content of carbon in ferrotitanium through an infrared carbon and sulfur instrument. The method mainly comprises the following steps: 1) crucible pretreatment: putting a crucible in a muffle furnace, preserving heat at 800-1400 DEG C for 1-3 hours, and then putting the crucible in a dryer for storage for no more than 24 hours; (2) pretreating the ferrotitanium sample, namely crushing the ferrotitanium sample to 80-120 meshes by using grinding equipment; and 3) detection by an infrared carbon-sulfur analyzer: adding part of the fluxing agent into the crucible pretreated in the step 1), putting a to-be-detected sample, uniformly covering the to-be-detected sample with the remaining fluxing agent, and putting the to-be-detected sample on the infrared carbon-sulfur analyzer for analysis. According to the detection method, the carbon content in ferrotitanium can be rapidly and accurately measured, the analysis result is stable and reliable, the labor intensity of post personnel is relieved, and the working efficiency is improved; according to the method, the ferrotitanium sample is crushed to 80-120 meshes, so that the particles are uniform, and the determination result is ensured.

The invention discloses a steel-making method for super-large heat input welding steel. The technological process comprises the steps of KR-BOF-LF-RH-CC. Metallic manganese and silicomanganese are adopted for weak deoxidation in the whole LF process, the temperature of molten steel is controlled within 1600 DEG C after white slag making is conducted for the first time, the sulfur content of the LF is controlled within 0.005%-0.008% before the LF leaves the station, the LF leaves the station after rare earth Ce core-spun yarn is added, RH enters the station and blows oxygen for 30-60 s, then a proper amount of ferrotitanium and calcium yarn are added, vacuumizing operation is conducted, Al + Mg yarn is fed after vacuum breaking, and high-temperature-resistant spherical inclusions of Ti, Mg, Ce, Ca, Mn, Al, O and S with the diameter smaller than 2 micrometers are obtained after casting. The inclusions can effectively promote formation of ferrite in fine grains and refine grains in the large heat input welding process, a rolled steel plate can meet the 700 KJ / CM ultra-large heat input welding performance, the impact energy from the weld center to the fusion line FL + 2 area at the temperature of 40 DEG C is larger than 80 J, and the impact energy from the fusion line FL + 2 to the base metal area at the temperature of 40 DEG C is 200 J or above.

The invention provides a rotary kiln temperature control and kiln lining heat conduction prediction method for a redox ferrotitanium production plant. The method comprises the following steps that a biomass auxiliary fuel injection device is introduced; the dynamic proportion control of the biomass and the coal is realized based on the dynamic proportion control system of the biomass and the coal; fusing into a kiln lining heat conduction prediction model; all the subsystems act synergistically, so that the kiln lining stress is kept controlled while the kiln drying process is accelerated. The method has the beneficial effects that firstly, biomass auxiliary fuel injection is introduced, and biomass auxiliary combustion can improve the heat utilization rate under the condition that the heating rate is guaranteed; and secondly, the dynamic proportion control of biomass and coal is realized, the supply proportion of the two fuels is adjusted in real time through an intelligent algorithm, and the defect of unstable combustion or temperature control deviation possibly caused by the traditional fixed proportion is overcome. And thirdly, a CFD-based kiln lining heat conduction and humidity prediction model is integrated. After kiln drying is completed, the surface of the kiln lining is intact and free of cracks, and the service life of the kiln lining is remarkably prolonged.

The invention belongs to the field of refractory materials. The invention provides a novel Al2O3-MgO-TiFe composite refractory material which comprises the following raw materials in percentage by weight: 50-75% of Al2O3, 30-50% of MgO, 5-15% of ferrotitanium and phenolic resin which accounts for 2-6% of the total weight of the raw materials and is used as a binding agent. The preparation method comprises the following steps: uniformly mixing the raw materials with a binding agent, carrying out compression molding, drying to obtain an Al2O3-MgO-TiFe composite blank, and sintering the Al2O3-MgO-TiFe composite blank in an air atmosphere at the temperature of 1100-1600 DEG C; the designed Al2O3-MgO-TiFe series new material can react under the oxidizing atmosphere to generate a multi-component compound, Ti and Fe react with Al2O3 and MgO through in-situ oxidation under the oxidizing atmosphere to generate a compound of a MgO-Al2O3-TiO2 and Al2O3-MgO-FeO system, metal directly participates in the reaction, the oxygen partial pressure of the system can be regulated and controlled, and stable existence of ferrous ions is ensured. The series of compounds have good calcium ion corrosion resistance and anti-stripping performance.

This invention discloses a method for manufacturing a large-diameter seamless steel pipe resistant to low temperatures and its application, which includes optimizing material composition, improving processing technology, and employing plasma boronizing technology. By adding nickel-iron alloy, ferrovanadium, ferrotitanium, and the rare earth element Ce, combined with processes such as argon stirring, ceramic filtration, and online cooling, the low-temperature performance of the steel pipe is significantly improved; the surface is treated with plasma boronizing to form a high-hardness boronized layer, improving wear resistance and corrosion resistance. The steel pipe prepared in this application achieves an impact toughness of 80 J / cm at -60℃. 2 With tensile strength exceeding 900MPa and yield strength exceeding 750MPa, it is suitable for extreme working conditions and has excellent reliability and service life.

The invention belongs to the technical field of ferrous metallurgy refining processes, and relates to a method for improving the yield of ferrotitanium in the LF refining process, which effectively improves the yield of the ferrotitanium refined in the LF refining process, improves the stability of the titanium component in molten steel, and meets the product quality requirement at lower production cost. By means of the method, the ferrotitanium yield in the LF refining process can be stably increased, the ferrotitanium yield is stabilized to be 75% or above, and the qualification rate of the titanium component reaches 100%. The method solves the problems of low titanium alloy yield, unstable titanium content in molten steel, unqualified titanium component judgment and the like, and is a low-cost and high-stability production method.