655 results about "Ferrosilicon" patented technology

The invention relates to the technical field of welding wire preparation, in particular to a nickel-based alloy flux-cored wire for 9Ni steel welding and a preparation method of the nickel-based alloy flux-cored wire. A nickel-based alloy flux-cored wire for 9Ni steel welding comprises a flux core, and the flux core comprises, by weight, 26%-34% of titanium dioxide, 3%-5% of ferrozirconium, 8%-12% of ferrotitanium, 1%-3% of rare earth ferrosilicon, 15%-20% of tungsten powder, 1%-2% of polytetrafluoroethylene and the balance pretreated mixed powder. The nickel-based alloy flux-cored wire for 9Ni steel welding has the advantages that low-melting-point eutectic is not prone to being formed, the hot crack sensitivity is reduced, the nickel-based alloy flux-cored wire is suitable for welding of restrained large structures, the deoxidation and denitrification capacity is enhanced, and the pore sensitivity is reduced.

The invention relates to a slag charge adding device for smelting low-phosphorus steel through a high-silicon molten iron converter double-slag method, and relates to the technical field of steel-making slag charge adding. The slag charge adding device comprises a base, a converter body is installed on the base, a fixing frame is fixedly connected to the base, a moving assembly is arranged on the fixing frame, a storage barrel is arranged on the moving assembly, and the storage barrel is connected with the converter body. A sorting assembly is arranged below the storage barrel, and the lower portion of the sorting assembly communicates with a spreading disc. The method has the advantages that the slag materials are separated and scattered in different areas according to different sizes, large particles fall into the center position close to the converter body, small particles fall into the area close to the side wall of the converter body, and the temperature of the center position of the converter body is usually the highest area, so that the slag materials are separated; and the high temperature is beneficial for increasing the melting speed of the large-particle slag charge, so that the large-particle slag charge can participate in the chemical reaction of steelmaking more quickly.

The invention discloses a production method of ferrous dihydrogen phosphate, which comprises the following steps of: changing an iron source of iron-process iron phosphate from traditional iron blocks or iron powder into oxide scale, compounding phosphoric acid and sulfuric acid into mixed acid, and controlling the granularity of the oxide scale and the components and acidity of the mixed acid to solve the problems of dissolution and passivation of the oxide scale. According to the method, iron oxide scale can be better dissolved, the residual problem of ferric ions is solved by reducing excessive iron blocks or iron powder, undissolved impurities such as carbon, silicon and iron are removed by filtering, and finally, the stability problem of a reaction system is solved by adjusting the pH value of the system through industrial phosphoric acid and pure water, so that a ferrous dihydrogen phosphate solution required for producing iron phosphate is obtained. The production cost of an iron source required by iron phosphate is greatly reduced, other impurities are not contained, and mixed acid-containing filtrate and washing water generated in the production process can be recycled through an evaporation device.

The invention aims at disclosing a high-flatness and high-heat-conductivity titanium-aluminum composite plate, a forming process and a heat treatment device, and relates to the technical field of titanium-aluminum composites.The high-flatness and high-heat-conductivity titanium-aluminum composite plate is formed by compositing a TC4 alloy titanium plate with the first thickness and a high-strength aluminum plate with the second thickness; the first thickness accounts for 12%-50% of the total thickness of the composite board, and the total thickness of the composite board is 2.0 mm-7. 5mm; the TC4 alloy titanium plate comprises the following components in percentage by weight: 86 to 89 percent of titanium, 5.5 to 6.8 percent of aluminum and 3.5 to 4.5 percent of vanadium; the high-strength aluminum plate comprises 0.4 wt%-0.8 wt% of silicon, 0.7 wt% of iron, 0.15 wt%-0.4 wt% of copper, 0.15 wt% of manganese, 0.8 wt%-1.2 wt% of magnesium, 0.04 wt%-0.35 wt% of chromium, 0.25 wt% of zinc, 0.15 wt% of titanium and aluminum, and the titanium-aluminum composite plate has the beneficial effects that the thickness of the TC4 alloy titanium plate in the titanium-aluminum composite plate accounts for 12%-50% of the total thickness, that is, the titanium-aluminum composite plate is mainly the high-strength aluminum plate, and due to the fact that the high-strength aluminum plate is lower in density and lower in cost, the titanium-aluminum composite plate can be used for manufacturing the high-strength aluminum plate; the titanium-aluminum composite plate has the advantage in the aspect of cost performance; and clamping a plurality of staggered-surface laminated plates between the first counterweight plate and the second counterweight plate, and carrying out heat treatment to enable the flatness of the composite plate to be 0.5-1mm, so that the composite plate can be used for preparing the high-throughput operation cabinet.

The invention provides a sound-insulation porous ceramic tile and a preparation method thereof, and belongs to the field of building materials. The sound-insulation porous ceramic tile is prepared from the following raw materials: 20 to 30 parts of kaolin, 18 to 22 parts of quartz sand, 12 to 18 parts of potassium feldspar, 3 to 7 parts of talcum powder, 3 to 7 parts of silicon carbide powder, 2 to 4 parts of ferrosilicon alloy powder, 0.5 to 1.5 parts of sodium bicarbonate, 3 to 5 parts of hollow glass beads, 1 to 3 parts of zirconium oxide microspheres, 1 to 3 parts of silicon dioxide aerogel particles, 3 to 5 parts of acrylate emulsion, 1 to 3 parts of butadiene styrene rubber emulsion, 0.5 to 1.5 parts of polyvinyl alcohol solution and 1 to 2 parts of polyurethane dispersion. The composite material comprises the following components in parts by weight: 30-60 parts of polypropylene, 0.3-0.7 part of a dispersing agent, 0.2-0.4 part of a defoaming agent, 0.8-1.6 parts of reinforced fibers and 9-13 parts of deionized water. The raw materials of the porous ceramic tile are reasonably designed, the sound insulation performance of the porous ceramic tile is improved, and full-band efficient sound insulation is achieved.

The invention discloses a multi-stage graded crushing and particle size homogenization control method for ferrosilicon crushing. The method comprises the following steps: S1, raw material characteristic perception and pretreatment; s2, self-adaptive multi-stage crushing; s3, performing dynamic coupling classification screening; s4, performing intelligent closed-loop optimization; according to the method, the problem of granularity fluctuation caused by parameter adjustment lag in a traditional control method is avoided through the self-adaptive PID algorithm, the pertinence and the real-time performance of crushing parameter adjustment are remarkably improved, and an accurate parameter basis is provided for granularity gradient control; the grading and crushing parameter coupling model realizes dynamic matching of the grading efficiency and the crushing load, so that the process redundancy caused by invalid material returning is reduced while the granularity screening precision is ensured; the equipment wear compensation machine learning model can accurately quantify granularity drift caused by equipment characteristic difference in different crushing stages, and the long-term stability of granularity prediction is improved.

The invention provides an ultra-low carbon duplex stainless steel all-position welding flux-cored wire and a welding method thereof.The outer skin of the flux-cored wire is a stainless steel strip, the flux-cored wire is filled with powder, and the powder comprises, by mass, 18-25% of natural rutile, 20-30% of stainless steel powder, 20-30% of stainless steel powder, 20-30% of stainless steel powder and the balance stainless steel powder. 3-5% of sodium titanate; 5-10% of quartz sand; 0.5 to 4 percent of zircon sand; 1-3% of sodium fluoride; 15 to 25 percent of ferromolybdenum; 3-6% of nitrided ferrochrome; 2-4% of electrolytic manganese; 5-8% of nickel powder; 27 to 32 percent of metal chromium; 0.5-2% of magnesium powder; 0.5 to 1.5 percent of bismuth oxide; and 1-4% of silicon iron. The flux-cored wire is used for all-position welding of third-generation duplex stainless steel, welding spatter is small, and weld joint forming is good; the carbon content of a weld joint is extremely low, and through component and welding process control, weld joint metal has strength, plasticity, toughness and corrosion resistance equivalent to those of base metal. And the double requirements of high strength and toughness and high corrosion resistance in the manufacturing fields of submarine pipeline laying, shipbuilding, marine gas field exploitation and the like are ensured.

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-temperature-resistant and corrosion-resistant aluminum alloy material and a preparation process thereof, and relates to the technical field of aluminum alloy materials. The high-temperature-resistant and corrosion-resistant aluminum alloy material is prepared by carrying out micro-arc oxidation treatment on aluminum alloy, carrying out plasma spraying on a corrosion-resistant spray coating and carrying out heat treatment. The aluminum alloy comprises the following raw material components in percentage by weight: 0.05%-0.15% of silicon, 0.1%-0.2% of iron, 1.2%-1.5% of copper, 0.7%-0.9% of manganese, 2.5%-3.8% of magnesium, 10.2%-12.4% of zinc, 0.02%-0.04% of titanium, 0.08%-0.15% of zirconium, 0.2%-0.4% of scandium, 0.5%-0.8% of silicon nitride whiskers, 0.5%-1% of an aluminum-coated graphene material and the balance of aluminum.

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 relates to the technical field of ferrous metallurgy, in particular to a smelting method for silicon deoxidation of low-carbon low-silicon aluminum killed steel. The method comprises a converter, an alloy fine adjustment station, RH refining and continuous casting. A strong bottom blowing mode is adopted in the later stage of converter blowing, and high-carbon ferromanganese, a ferrosilicon deoxidizing agent and lime are sequentially added during tapping; and after temperature measurement and sampling in the alloy fine tuning station, the steel ladle is transported to RH refining. And the RH executes different treatment modes according to Si and C components of the alloy fine tuning station, such as oxygen blowing decarburization and desilicication, direct aluminum particle addition alloying or vacuum reserved oxygen decarburization and the like. Through cooperation of silicon pre-deoxidation and aluminum final deoxidation, the oxygen content of RH entering molten steel and consumption of an aluminum deoxidizing agent are reduced, and the cleanliness of the molten steel is improved; different treatment modes shorten the treatment period, reduce the final temperature of the converter, meet the low-carbon and low-silicon requirements, reduce the production cost and improve the production efficiency.

The invention relates to the field of comprehensive utilization of resources, and discloses a method for comprehensively utilizing high-iron bauxite, which comprises the following steps of: grinding the high-iron bauxite into fine ore, and uniformly mixing the fine ore with a binder and water to form pellets; drying the made pellets at the temperature of 200-300 DEG C until the water content is below 1%; the dried pellets are added into an electric arc furnace and heated to 1500-1600 DEG C for melting, a molten pool is formed, hydrogen is introduced into the molten pool, and molten iron and slag are generated; the molten iron is used for steelmaking or made into castings, and the slag is used for separating and extracting Al2O3, Fe2O3 and SiO2 after water quenching. The high-iron bauxite is reduced through hydrogen, CO2 is not generated, carbon pollution is avoided, after iron is extracted, slag is subjected to water quenching, aluminum, silicon, iron and other components are separated and extracted, various components in the high-iron bauxite can be fully recycled, the recovery rate is high, the comprehensive utilization degree is high, and waste is little.

The invention discloses a submerged nozzle lining material for rare earth steel continuous casting and a preparation method thereof, and relates to the field of refractory materials. The high-strength wear-resistant ceramic material comprises the following components in percentage by weight: 40-65 wt% of fused white corundum, 8-20 wt% of quartz, 15-25 wt% of crystalline flake graphite, 1-2 wt% of metal silicon powder, 2-4 wt% of ferro-silicon nitride powder, 0.5-1 wt% of boron carbide powder and 8-12 wt% of thermosetting phenolic resin. The method has the beneficial effects that the raw materials are processed through the processes of mixing, drying and the like to prepare the pug, the pug is used for manufacturing the submersed nozzle lining, the submersed nozzle using the lining is used for rare earth steel pouring, the nodulation problem of an inner hole of the nozzle is remarkably relieved, the content of inclusions in molten steel is reduced, the quality of steel billets is improved, and meanwhile the production cost is reduced. And the service life of the submersed nozzle is prolonged, so that the submersed nozzle is more suitable for production of rare earth steel protective pouring.

The invention discloses a clean preparation method of a rare earth ferrosilicon alloy based on cooperative control of carbon addition and silicon supplement, and belongs to the technical field of thermometallurgy. In order to solve the problems that according to an existing carbon thermal reduction method, the furnace bottom is prone to nodulation, the recovery rate is low, and energy consumption is high, the'carbon addition-silicon supplementation-carbon depletion 'ternary cooperative regulation and control method is provided. Comprising the following steps: taking a rare earth-containing material, a siliceous raw material and a carbonaceous reducing agent as raw materials, burdening, pelletizing, and adding into a submerged arc furnace for reduction smelting; the core technology is that the weight ratio of oxide to reducing agent carbon in the rare earth pellets is controlled to be 1: (1.20-1.30), meanwhile, a silicon element accounting for 2.0-10.0% of the weight of the oxide is added, and parameters meet the coupling relational expression S = k * (1.30-R) * 100% + S0; and the smelting adopts carbon deficit operation, and the carbon addition amount is 0.90-0.95 times of the theoretical amount. The method inhibits the generation of the rare earth carbide nodule at the furnace bottom from the aspects of thermodynamics and dynamics, and realizes continuous and stable production. The rare earth recovery rate reaches 96% or above, the comprehensive power consumption is reduced to 8600-9000 kWh / t, the furnace life is prolonged to 25 months or above, and remarkable economic and environmental benefits are achieved.

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 relates to the technical field of amorphous nanocrystalline mother alloy smelting, and discloses a low-cost iron-based amorphous nanocrystalline mother alloy non-vacuum smelting method based on high-aluminum niobium silicon iron, which comprises the steps of material distribution and heating smelting in a furnace, alloying and primary refining, slagging and secondary soft argon blowing refining as well as slagging-off and tapping. By means of the argon blowing process and the secondary refining slagging process in a non-vacuum smelting system, the exogenous inclusions introduced by the high-aluminum niobium silicon iron can be removed to the maximum extent. The production cost of the master alloy can be remarkably reduced, the cleanliness of the master alloy can be improved, and the method has economical efficiency and practicability and is suitable for industrial large-scale popularization and application.

The invention discloses an aluminum alloy for four doors and two covers of a new energy automobile and a preparation method of the aluminum alloy, and relates to the technical field of aluminum alloys, and the aluminum alloy comprises the following chemical components in percentage by mass: less than or equal to 0.20% of silicon, less than or equal to 0.35% of iron, less than or equal to 0.15% of copper, 0.20-0.50% of manganese, 4.0-5.0% of magnesium, less than or equal to 0.10% of chromium, less than or equal to 0.25% of zinc, 0.10% of titanium, 0.30-0.45% of zirconium, less than or equal to 0.35% of rare earth components and the balance of aluminum. The preparation method comprises the working procedures of smelting, refining, degassing, casting, saw cutting, surface milling, heat treatment, rolling and the like. By adjusting the chemical components, the proportion and the preparation process, the prepared aluminum alloy has higher tensile strength, yield strength and elongation at break compared with an existing medium-strength 5182 alloy, and the mechanical property of an aluminum alloy material is remarkably improved; and the alloy also has the advantages of small density, high hardness, good corrosion resistance, good stamping performance, easiness in welding forming and the like, and the safety performance of the current lightweight new energy automobile and the protectiveness to people in the automobile can be greatly improved.

The invention provides a flux-cored wire for marine crack arrest steel and a preparation method and application of the flux-cored wire, and particularly relates to the technical field of welding materials. The flux-cored wire comprises a steel strip and a flux core filled in the steel strip, and the flux core comprises the following components in parts by weight: 10-15 parts of rutile, 5-6 parts of quartz, 2-4 parts of ferrotitanium, 20-40 parts of sodium fluoride, 20-40 parts of potassium feldspar, 6-18 parts of manganese-silicon alloy, 4-8 parts of low-carbon ferromanganese, 1.5-2.5 parts of magnesium powder, 1.5-2 parts of rare earth ferrosilicon, 0.2-0.4 part of ferroboron, 1-2 parts of metallic nickel and 1.5-6 parts of iron powder. The ship crack arrest steel flux-cored wire has the advantages of being high in strength, good in low-temperature toughness, good in crack resistance, high in deposition rate, stable in electric arc, little in splashing, easy in slag removal and attractive in weld joint forming, and is suitable for welding of crack arrest steel at a core structure part of an ultra-large container ship.

The invention discloses a wind-energy torsion-resistant aluminum alloy cable and a manufacturing method thereof, and relates to the technical field of cables, the wind-energy torsion-resistant aluminum alloy cable comprises a cable core, a braided shielding layer and a sheath layer which are sequentially arranged from inside to outside, and the braided shielding layer and the sheath layer are arranged outside the cable core; the cable core is formed by twisting a plurality of insulated wire cores; each insulating wire core comprises an insulating layer and a torsion-resistant aluminum alloy conductor wrapped by the insulating layer. The torsion-resistant aluminum alloy conductor is obtained by taking an AA8030 aluminum alloy as a matrix and doping silicon, iron, cadmium, scandium, manganese, a carbon nanotube and a graphene nanosheet. By doping silicon, iron, cadmium, scandium, manganese, the carbon nanotubes and the graphene nanosheets, aluminum alloy component grains are refined, the tensile strength and the elongation at break are improved compared with those of existing aluminum alloy, the alloy forms a nano-micron multi-scale reinforced structure through doping of the carbon nanotubes and the graphene nanosheets, and the tensile strength and the elongation at break are improved. And the strength and toughness of the aluminum alloy are jointly improved.

The present application relates to a kind of small square billet sulfur titanium-containing welding wire steel and its preparation method, belong to the technical field of steelmaking.The converter smelting process, refining process and continuous casting process, specifically are as follows:in the converter smelting process, tapping is carried out using aluminum block, ferrosilicon, silicon manganese deoxidation alloying, pre-slagging is carried out by adding lime, after tapping is finished, the total mass content of FeO and MnO in slag is controlled≤2.5%;In the refining process, lime, calcium carbide and aluminum particles are added for slagging and diffusion deoxidation, after slagging is finished, the slag basicity is controlled to be 2.5~3.0, the total mass content of FeO and MnO in slag is≤0.5%, the total oxygen content of molten steel is≤10ppm, sulfur wire and titanium wire are accurately fed;In the continuous casting process, the inclusion is controlled to gather in the stopper head and the water gap bowl by stopper shaking method, and the basicity of protective slag is controlled to be 0.85~0.95.The sulfur titanium-containing welding wire steel prepared by the above method.The present application solves the problems of small square billet sulfur titanium-containing welding wire steel surface slag inclusion, intermediate crack and water gap nodule.

The present invention provides an iron-based nanocrystalline soft magnetic alloy powder, a soft magnetic composite material and a preparation method thereof, belonging to the technical field of soft magnetic materials. The iron-based nanocrystalline soft magnetic alloy powder has a heterogeneous nanocrystalline structure comprising a three-dimensional island-shaped amorphous region and a nanocrystalline region. The diameter of the three-dimensional island-shaped amorphous region is 50-100 nm, and the number density of the three-dimensional island-shaped amorphous region is 10 19 ‑10 20 m ‑3 The iron-based nanocrystalline soft magnetic alloy powder has the advantages of high sphericity, high saturation magnetization and low coercive force; the soft magnetic composite material comprises soft magnetic powder and a coating layer coated on the surface of the soft magnetic powder, and the coating layer comprises a binder, wherein the soft magnetic powder is the iron-based nanocrystalline soft magnetic alloy powder provided by the present invention, or is composited with at least one of iron-nickel, iron-nickel-molybdenum, iron-silicon, iron-silicon-aluminum, iron-silicon-chromium, carbonyl iron and pure iron powder, and has the advantages of low high-frequency loss, high magnetic permeability and high DC bias.

The invention relates to a method for improving molten steel aluminum content detection precision, and belongs to the technical field of molten steel aluminum content detection.The method comprises the following steps that converter tapping silicon carbide is subjected to pre-deoxidation; and adding ferrosilicon for alloying, and adding an aluminum block for deoxidizing and refining. During deoxidation refining, the basicity of the slag is controlled to be 0.5-0.6, the white slag atmosphere is kept for more than 10 minutes, 0.5-1.5 kg / t of bauxite and 0.5-1.0 kg / t of magnesia are added during refining outbound, the content of aluminum oxide and MgO in the slag is increased, and the content of TFe + MnO in the outbound slag is controlled to be smaller than or equal to 2%. A pail sampler with the specification of 40mm * 120mm is selected to sample molten steel, and the depth of the pail sampler inserted into the molten steel is controlled to be 230-250mm. After sampling, uniformly cooling the pail sampler in a 20-DEG C cooling device to obtain a sample A; the method realizes accurate control of aluminum in molten steel, meets the quality requirements of products, and has the characteristics of high detection precision, good detection effect and high sample aluminum content uniformity, thereby improving the performance of the products.

The invention relates to a preparation technology and a use method of a wear-resistant steel ball for a large semi-autogenous mill, which are characterized in that a scrapped car shell, a scrapped cold roll and waste silicon carbide are used as main furnace charges to smelt molten steel in an electric furnace, and a small amount of aluminum-silicon-calcium alloy, rare earth magnesium-silicon-iron alloy and nano TiC are added to improve the quality of the molten steel. Molten steel is directly poured into a square billet on a square billet continuous casting machine, after the continuous casting square billet is rolled and forged, forging waste heat water cooling short-time quenching and isothermal quenching composite heat treatment is adopted, the wear-resistant steel ball with excellent obdurability and wear resistance is obtained, the phenomena of cracking, stripping and out-of-round do not occur when the wear-resistant steel ball is used on a large semi-autogenous mill, wear is low, and the service life of the wear-resistant steel ball is prolonged. And the production efficiency of the large semi-autogenous mill can be remarkably improved, the ore grinding cost is reduced, and remarkable economic and social benefits are achieved in application and popularization.

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 belongs to the technical field of soft magnetic materials, and particularly relates to a preparation method of a low-loss high-direct-current superposition iron-silicon / iron-nickel composite magnetic powder core. The large-particle iron-silicon alloy powder and the small-particle iron-nickel alloy powder are mixed, the large deformation degree of the iron-nickel particles can be prevented, meanwhile, the direct-current superposition characteristic of the magnetic powder core is improved, and power loss is reduced. And the magnetic powder is preheated in N2 or H2 atmosphere, so that the grains grow up, the grain boundary is reduced, and the hysteresis loss of the magnetic powder core is effectively reduced. The magnetic powder is coated with the aluminum-magnesium silicate, the coating effect can be improved, the dispersion effect of the coated magnetic powder is good, the redundant coating agent serves as filler, and the completeness of a coating layer during forming is guaranteed. And the magnetic powder core blank is annealed in the H2 atmosphere, so that the blank is prevented from being oxidized, and the power loss of the magnetic powder core is reduced. The prepared low-loss iron-silicon magnetic powder core has excellent soft magnetic performance and low power loss, and meets the requirements of electronic components for soft magnetic material performance.

The invention relates to a novel high-manganese austenitic steel manual arc welding rod for frog repair. The welding rod comprises 70-80 wt% of a welding rod core and 20-30 wt% of a coating, wherein the outer surface of the welding rod core is coated with the coating. The welding rod core comprises the following chemical components in percentage by weight: 0.95 to 1.2 weight percent of C, 36 to 46 weight percent of Mn, 2.0 to 4.0 weight percent of Mo, 1.0 to 5.0 weight percent of Cr, 0.5 to 6.0 weight percent of Al, 0.5 to 6.0 weight percent of V, 0.5 to 4 weight percent of Cu, 0.1 to 1.0 weight percent of Si, less than or equal to 0.002 weight percent of P, less than or equal to 0.002 weight percent of S and the balance of Fe and inevitable impurities; the coating comprises the following chemical components in percentage by weight: 20 to 30 percent of marble, 10 to 20 percent of fluorite, 10 to 20 percent of rutile, 4 to 6 percent of 45 ferrosilicon, 5 to 8 percent of low-carbon ferromanganese, 5 to 8 percent of sodium carbonate and the balance of iron powder. The welding rod is matched with frog base metal, good metallurgical bonding is generated, and the welding rod has the advantages of being low in hot crack sensitivity, excellent in impact wear resistance, high in strength, hardness and toughness, low in cost, simple in component system, excellent in operation manufacturability and the like.

The invention provides a production method of high-strength nodular cast iron and belongs to the technical field of metal material processing. Comprising the following steps: proportioning: proportioning the following raw materials in percentage by weight: 60-70% of pig iron, 20-30% of foundry returns and 10-15% of waste steel; pig iron is added to the bottom of the furnace, foundry returns are added, and finally waste steel is added; after the molten iron is uniformly molten, heating to 1420-1440 DEG C, and sampling to analyze chemical components; inoculation and nitrogen increasing treatment: spheroidizing by adopting a pouring method, sequentially adding pure antimony, a rare earth magnesium spheroidizing agent and a mixture of ferromanganese nitride and a ferrosilicon inoculant, adding the rest of molten iron and the inoculant in stages, and adding an antimony-containing inoculant during pouring; and after pouring is completed, the box is opened for cooling when the temperature of the casting is reduced to 800-900 DEG C. According to the method, the nitrogen increasing process is matched with microalloying, the problems of high alloy adding amount and high cost in the prior art are solved, the alloy using amount can be remarkably reduced, and meanwhile the mechanical property of cast iron is guaranteed.

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 blast furnace iron making, and particularly discloses a blast furnace composite stemming and a preparation method thereof.The blast furnace stemming is prepared from, by mass, aggregate including (43-X1-X2-X3)% of brown fused alumina, 13% of coke, (16-B)% of SiC, B% of clay, 4.5% of sericite, 7% of kyanite, 7.5% of silicon carbide iron, 4% of ball pitch, 5% of iron area waste mixture, 1% of iron oxide scale Fe3O4 X, 2% of cubic boron nitride c-BN X and 3% of graphene oxide GO X; comprising the following components in percentage by weight: 13-C% of tar, C% of asphalt and 2% of sodium pyrophosphate Na4P2O7; according to the method, stemming softening caused by excessive use of the oxide scale when the cold air pressure is low is prevented, the problems of incomplete internal structure and insufficient strength development of stemming caused by insufficient heat are avoided, excessive use of nanoscale materials is avoided, and the material cost is reduced.

The invention belongs to the technical field of metal materials, and particularly relates to an as-cast high-strength and high-toughness aluminum alloy and a composite refining modification treatment process thereof.The as-cast high-strength and high-toughness aluminum alloy is prepared from, by mass, 9.6%-12.6% of Si, 0.5%-1.5% of Fe, 1.5%-4% of Cu, 0.25%-0.75% of Mn, smaller than or equal to 1% of Ce and the balance Al, according to the as-cast high-strength-and-toughness aluminum alloy, by increasing the content of silicon, iron, copper and manganese, second strengthening phases such as eutectic silicon, MnFeSi and CeCuSi are formed, the mechanical property of the aluminum alloy is jointly improved under composite refining modification treatment, and the finally obtained aluminum alloy has the excellent mechanical property.