35 results about "Ferrochrome" patented technology

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 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.

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.

This invention applies selective laser cladding (SLS) technology to the fabrication of reducer pin tooth housings, designing a lightweight, high-strength pin tooth housing with both material and structural gradients. In terms of materials, a gradient material layer-by-layer printing process is employed, with the outer layer using high-strength alloy steel as the base layer, the middle layer using GCr15 bearing steel powder, and the inner gear surface coated with a thin layer of AlCoCrFeNi high-entropy alloy powder. A certain proportion of transition zone material is incorporated between each layer to enhance the wear resistance and contact fatigue strength of the pin tooth housing. Structurally, a certain structural gradient is used, with a three-layer structure designed using UG 3D modeling software. The top and bottom layers are solid and gapless, while the middle layer uses a negative Poisson's ratio hollow structure, significantly reducing the weight of the pin tooth housing and achieving lightweight design. This dual-gradient design allows the reducer to maintain better overall mechanical performance while achieving a lightweight design.

The application discloses an oil well pump of high-speed steel containing aluminum and boron and a preparation method thereof, and belongs to the technical field of metal materials. The preparation method comprises the following steps: taking pure iron, micro-carbon chromium iron, tungsten iron, boron iron, pig iron, vanadium iron, titanium iron and aluminum wire as raw materials, and obtaining high-speed steel melt through vacuum induction melting; graphite mold casting is carried out at 1400-1440 DEG C to obtain a cast blank; the cast blank is sequentially subjected to homogenizing annealing, austenitizing, deep undercooling treatment and tempering heat treatment, and finally the product is obtained. The oil well pump comprises the following chemical components in percentage by weight: Al: 1.06%-1.55%, C: 0.11%-0.25%, B: 1.76%-2.47%, and the microstructure is a tempered martensite matrix and (Fe,Cr)2B hard phase. The product has excellent corrosion resistance, wear resistance and service safety, and the cost is lower than that of traditional materials, can effectively resist downhole corrosion and erosion, prolong the service life of the oil well pump, and is suitable for downhole mining scenes in oil fields.

The application discloses a sodium vanadium precipitation wastewater treatment method, comprising the following steps: adding ferrous sulfate into sodium vanadium precipitation wastewater and stirring; stirring, precipitating and filtering after adjusting pH value by using a first alkaline solution to obtain vanadium-iron compound precipitate and a first filtrate; adding tetraacetyl diamine into the first filtrate and stirring; stirring, precipitating and filtering after adjusting pH value by using a second alkaline solution to obtain chromium-silicon compound precipitate and sodium sulfate solution. The scheme provided by the application uses ferrous sulfate for reduction, so that most vanadium is separated by adjusting a certain pH value and filtering, the vanadium can be applied to smelting vanadium-iron alloy, chromium-silicon slag is further recovered and smelted into chromium-iron, silicon is left in the chromium slag as an advantageous regulator for smelting chromium-iron, ammonia is removed in the process of adjusting pH value of the recovered chromium-silicon slag, special ammonia removal is not needed, and vanadium and chromium are not separated through vanadium-chromium filter cake.

The application discloses a method for preparing pure chromium trichloride and ferrous chloride by using low-silicon ferrochrome, and comprises the following steps: an acid leaching step: crushing ferrochrome raw materials with silicon content less than 1% to 1-5mm, adding hydrochloric acid for step-by-step leaching to obtain a leaching solution; a purification step: diluting the leaching solution to a total content of Cr and Fe of 20-80g / L, adding a purifying agent for stirring, standing and filtering to obtain a purified solution; a concentration step: performing negative pressure vacuum concentration on the purified solution, filtering most of sodium chloride when the concentration is 1 / 4-1 / 3 of the original volume, then adding components according to the content of chromium and iron in the filtrate and continuing to concentrate, cooling and crystallizing, and drying to obtain pure chromium trichloride and ferrous chloride. The application significantly improves the filtering performance in the purification process, reduces the loss of chromium and iron elements and the use cost of the purifying agent, and overcomes the problems of battery charge-discharge efficiency reduction and ion membrane blockage caused by the high silicon ion concentration in the electrolyte solution.

The application discloses a non-magnetic self-lubricating hardware material, which is composed of the following raw materials according to mass percentage: C 3.3%-3.8%, Si 2.0%-2.6%, Ni 10%-14%, Mo 0.5%-1.0%, V 0.5%-1.0%, Mn 0.1%-0.2%, P≤0.1%, S≤0.015%, and the balance of Fe, wherein the total of the content of the above components is 100%. The application further discloses a preparation method of the material: step 1, weighing bread iron, silicon iron, nickel plate, chromium iron, molybdenum iron, vanadium iron and carbon additive, and melting the weighed materials in a medium-frequency furnace to obtain a first liquid; step 2, pouring the first liquid into a holding furnace, and adding silicon barium inoculant and rare earth magnesium spheroidizing agent to fully stir; step 3, adopting a horizontal continuous casting method to obtain a casting; step 4, water-cooling the first metal piece in a vacuum furnace; step 5, low-temperature tempering the second metal piece in a muffle furnace; and step 6, machining the third metal piece into a hardware shape. The application solves the problems of poor wear resistance, poor corrosion resistance and large electric loss of the existing iron hardware.

This invention discloses a method for the classification, impurity removal, and densification of micro-carbon ferrochrome powder in a field, comprising the following steps: S1: pretreatment and crushing of the raw ore; S2: multi-stage precise classification and particle size statistical control; S3: gravity separation for coarse-grained materials; S4: magnetic separation for medium-coarse-grained materials; S5: flotation for medium-fine-grained materials; S6: centrifugal classification and statistical optimization for fine-grained materials; S7: multi-stage material merging and homogenization; S8: pre-compression densification; S9: high-temperature densification and calculus model control; S10: cooling and crushing / shaping; and S11: finished product testing, packaging, and storage. This method realizes the entire process from raw ore to densified micro-carbon ferrochrome powder, and has the advantages of high purification efficiency and high resource utilization.

This invention belongs to the field of sorting devices, specifically relating to a high-carbon ferrochrome sorting device, including a sorting box with a sorting trough slidably connected inside. Multiple evenly distributed baffles are fixedly installed on the bottom inner side of the sorting box. A vibration mechanism is installed on the sorting box. A feeding hopper is installed on the upper left side of the sorting box via a flange, and an auxiliary feeding mechanism is installed on the feeding hopper. Multiple evenly distributed discharge ports are fixedly installed at the lower end of the sorting box. The vibration mechanism and the inclined sorting trough provide a composite vibration to the material, allowing it to be fully dispersed and tumbled within the sorting trough, greatly improving screening efficiency and reducing fine particle jamming. The core design of "variable height baffles and multi-width sorting holes" achieves stratified and progressive screening of the material: the baffles control the thickness of the material layer, and the material passes through different aperture areas sequentially during vibratory conveying, thus completing a step-by-step, precise sorting from fine to coarse.

This invention provides a method for producing 40Cr10Si2Mo martensitic valve steel wire rod. The method includes the following steps: S1: High-temperature initial smelting and precise alloy formulation. Compliant scrap steel and high-carbon ferrochrome are selected as basic smelting raw materials. Scrap steel must be free of oil and rust. High-carbon ferrochrome is pre-dried and placed in a dedicated smelting furnace for melting and initial smelting. The method for producing 40Cr10Si2Mo martensitic valve steel wire rod provided by this invention smoothly releases residual stress within the steel, effectively avoiding cracking and deformation problems during later storage, transportation, and deep processing, improving product qualification rate. Annealing treatment makes the metallographic structure and hardness distribution more uniform, significantly improving the steel's processing performance. It is suitable for various subsequent processing steps such as bending, cutting, and forming, making the processing smoother, reducing finished product loss, and improving processing efficiency. The entire process is rationally connected and standardized, enabling mass industrial production.

This invention relates to silicon-ferrochrome with low doping content, comprising, by weight percentage of total alloy weight: not less than 33% chromium, not less than 47% silicon, not more than 0.025% carbon, not more than 0.02% phosphorus, not more than 0.015% nitrogen, not more than 0.03% hydrogen, not more than 0.4% oxygen, and not more than 0.005% sulfur, with the balance being iron and trace impurities, and a chromium-to-iron ratio of not less than 2.0. This invention also relates to a method for producing silicon-ferrochrome with low doping content and its use in the production of low-carbon ferrochrome.

The application belongs to the technical field of heat treatment, and particularly relates to a manufacturing process of ferritic stainless steel and application thereof. The manufacturing process of ferritic stainless steel comprises the following steps: S1, steelmaking: smelting steelmaking raw materials to obtain molten steel; the steelmaking raw materials comprise molten iron raw materials and chromium molten iron raw materials; the weight percentage of P element in the molten iron raw materials is less than or equal to 0.025%, and the weight percentage of S element is less than or equal to 0.025%; the feeding temperature of the molten iron raw materials is 1300-1500 DEG C; the content of Cr in the chromium molten iron raw materials is 40-60% of the total mass of the chromium molten iron raw materials; the feeding temperature of the chromium molten iron raw materials is 1450-1650 DEG C; S2, continuous casting; S3, hot rolling; and S4, warehousing. The manufacturing process of ferritic stainless steel can significantly reduce power consumption, fuel consumption and carbon emission while keeping the uniformity of the obtained product, mechanical properties and corrosion resistance stable.

This utility model discloses an aluminum alloy picture frame profile that can realize a supporting platform, belonging to the field of decorative picture frame structures. It includes a profile body, with an outer vertical edge on the left side and a supporting platform on the upper right side of the outer vertical edge. The supporting platform extends horizontally outward, and a corner groove is provided at the bottom of the profile body. The supporting platform can support the main body of the decorative painting, such as a frameless painting or a decorative painting composed of a magnetic base plate and ferrochrome printing media, achieving a flush effect between the image and the outer edge of the frame. The magnetic base plate is fixed to the supporting platform by adhesive or other methods, and the ferrochrome printing media is magnetically adsorbed onto the surface of the base plate. Because magnetic adsorption does not restrict the consistency of the boundary between the image and the base plate, the image can extend beyond the boundary of the magnetic base plate, breaking the limitation of the traditional picture frame where the image and base plate boundary overlap, achieving a unique floating display effect, and also avoiding the problem of the magnetic base plate being exposed and affecting aesthetics in traditional structures.

The application discloses a preparation method of modified high-carbon ferrochrome based on a pre-reduction technology and belongs to the technical field of ferroalloy metallurgy. The method comprises the following steps: uniformly mixing chromite concentrate, coke powder, lime and a silicon dioxide-titanium dioxide nano composite modifier to obtain a mixture; performing solid-state pre-reduction on the mixture in a rotary kiln, and controlling the pre-reduction degree to be 45-70%; loading the pre-reduced material into a submerged-arc furnace, smelting and reducing at 1650-1800 DEG C for 4-8 hours, until slag and iron are separated, and modified high-carbon ferrochrome is obtained. The nano composite modifier is prepared by a sol-gel method, is dispersed at a slag-gold interface during the pre-reduction and smelting processes, promotes uniform nucleation of ferrochrome carbide, and optimizes the microstructure of the molten slag. The application significantly improves the chromium recovery rate, reduces unit power consumption, improves the slag-iron separation effect, and realizes efficient, low-consumption and clean production.

This utility model provides an energy-saving high-carbon ferrochrome uniform material distribution device, comprising: a device body, a feeding hopper at the upper part of the device body, a first guide plate at the lower inner side of the feeding hopper, a material distribution plate and a vibrating part inside the device body, a second guide plate below the vibrating part, and a baffle part and a diversion part at the lower part of the device body. In this energy-saving high-carbon ferrochrome uniform material distribution device, material is guided smoothly into the device body through the feeding hopper and the first guide plate. The material distribution plate, driven by the vibrating part, completes a reciprocating vibration process, achieving initial material dispersion. The first and second diversion plates, in conjunction with a larger first through hole and a smaller second through hole, achieve material diversion, size screening, and uniform distribution. The specifications of the diversion plates can be changed as needed. The lower baffle part can control the material's fall, achieving a highly efficient and energy-saving material distribution and screening process.

This invention discloses a waste slag recycling device for ferrochrome smelting, relating to the field of ferrochrome smelting technology. It includes a base plate, with cylinders fixedly connected to the top of the base plate near both sides. A horizontal plate is fixedly connected to the top of each cylinder, and a cylinder is fixedly connected between the two horizontal plates. A handle drives an arc-shaped plate to rotate, pouring the waste slag into the cylinder. A second motor drives a cone crusher to rotate, grinding and crushing the waste slag. Small particles of the crushed waste slag pass through a filter screen and are discharged into the cylinder, while larger particles remain on top of the filter screen. The cylinder moves up and down via the horizontal plates, allowing the larger particles to continue contacting the cone crusher for further grinding and crushing. The filtered waste slag falls onto the surface of a magnetic drum, which adsorbs the iron slag within it. A first motor drives the magnetic drum to rotate, thereby expanding the magnetic drum's adsorption area for the iron slag.

The present application relates to a controllable morphology entropy-stable high-entropy oxide powder and a low-temperature high-pressure preparation method thereof. By selecting magnesium, cobalt, nickel, copper, zinc, strontium, lanthanum, chromium, iron, manganese, titanium, zirconium, gadolinium and other metal elements, the entropy-stable single-phase high-entropy oxide powder with rock salt, perovskite or fluorite structure can be synthesized under the condition far below the normal pressure phase transition temperature by using 10-300 MPa pressure assisted reaction. The method is based on the precursor morphology control, combined with the high-pressure atmosphere reaction kettle in a specific atmosphere for 0.5-24 hours of heat preservation, successfully overcomes the problem that the traditional pressureless or static pressure sintering is difficult to realize high phase purity and controllable morphology at the same time, and obtains the monodisperse and uniform structure powder. The process has the advantages of low temperature, low energy consumption, easy scaling and the like, and the obtained powder has excellent performance and can meet the application requirements in many fields.

This invention provides a welding wire, flux core, and deposited metal for welding Q550qENH uncoated bridge steel, belonging to the field of welding materials. The flux core comprises, by weight, the following: titanium dioxide: 3.5-5 parts; ferrosilicon powder: 2-4 parts; silicate: 0.2-0.5 parts; ferroaluminum powder: 0.2-0.4 parts; fluoride: 0.2-0.3 parts; ferromanganese powder: 1-3 parts; nickel powder: 0.6-1.2 parts; copper powder: 0.10-0.40 parts; ferrochrome: 0.2-0.4 parts; quartz sand: 0.3-0.6 parts; zircon sand: 0.2-0.4 parts; iron powder: 0.45-1.8 parts; and electrolytic manganese: 0.8-1.2 parts. This solves the problem that existing welding materials are unsuitable for welding Q550qENH uncoated bridge steel.

This invention belongs to the technical field of grinding equipment, and specifically relates to a vertical mill for high-carbon ferrochrome smelting raw materials. It includes a vertical roller mill body, with a guide pipe bolted to the feed inlet of the mill body, and a processing box fixedly connected to the top of the guide pipe. This high-carbon ferrochrome smelting raw material vertical mill features pre-crushing and uniform particle size distribution, online laser moisture measurement, dynamic hot air drying, and waste heat recovery. It effectively solves common industry problems such as unstable vertical mill operation, high wear, low grinding efficiency, and uncontrolled finished product indicators caused by mixed chromium ore powder and fluctuating moisture content. Through multi-mechanism collaboration, it significantly improves the stability, automation level, and grinding efficiency of the chromium ore vertical mill, significantly reduces operation and maintenance costs and overall energy consumption for grinding and smelting, and enhances the reliability and effectiveness of the vertical mill. This ensures long-term stable quality of the ground finished product, providing reliable support for the smooth operation of high-carbon ferrochrome smelting.

This invention discloses a method and system for preparing a reinforcing layer on the inner wall of a sootblower barrel, belonging to the field of surface engineering technology. This invention extends a supersonic flame spraying unit into the pipe to prepare the reinforcing layer under automated control. The spraying unit includes an extended spray gun rod, a swirling spraying mechanism, a positioning support assembly, and a position feedback monitoring unit, which can form a spiral spraying path and achieve precise control under non-visual conditions. The reinforcing layer uses tungsten carbide-cobalt-based cermet or an aluminum-cobalt-chromium-iron-nickel high-entropy alloy, with a spraying distance of 100-200mm, a spraying angle of 60-90°, and a spray gun moving speed of 200-500mm / s. The reinforcing layer prepared by this invention has a thickness ≤0.3mm, a hardness ≥1000HV0.3, a bonding strength more than 50% higher than conventional processes, a porosity reduced to below 1%, and wear resistance more than twice that of the base material. This can extend the service life of the sootblower barrel by more than 2 times, and is suitable for the inner wall protection of small-diameter, long-distance pipelines in industries such as power and chemical engineering.

This invention discloses a nickel-based alloy catalyst, its preparation method, and its application in the field of electrocatalysis. The catalyst includes a support and a metallic active component, wherein the metallic active component comprises three or more of the following: main metal nickel and alloy metals: copper, cobalt, chromium, iron, manganese, tin, aluminum, bismuth, and zinc. This catalyst is used in the electrocatalytic production of ethylene from carbon dioxide. Compared with common methods for preparing nanoscale high-entropy alloy materials, such as electrodeposition, this invention enables stable, green, low-cost, and scalable synthesis of nanoscale high-entropy alloy catalysts. It improves the kinetic efficiency and stability of CO2RR, CORR, and ORR reactions while avoiding the use of precious metals, achieving the design and preparation of highly active, low-cost catalysts. Furthermore, this invention also provides an application of a carbon black nickel-based high-entropy alloy catalyst in the electrocatalytic production of ethylene from carbon dioxide, exhibiting high Faradaic efficiency and good stability.

The application provides a preparation process of a light-weight aluminum alloy hub, relates to the field of aluminum alloy materials and application technologies, and comprises the following steps: mixing and heating carbon steel and pig iron to melt, adding high-carbon manganese iron, medium-carbon chromium iron and silicon iron, refining by heating, adding aluminum powder, entering a mold, demolding by cooling, homogenizing by heating, quenching, cooling and obtaining a mother plate; mixing bismaleimide, composite powder and sepiolite fiber, stirring after heating, coating on the mother plate, applying negative pressure first, then applying positive pressure, heating, cooling and obtaining a base layer; sputtering on the base layer to obtain a chromium nitride functional layer, cooling and obtaining a high-wear-resistance alloy lining plate; the composite powder is prepared by mixing and heating chromium carbide powder and hydrogen peroxide solution, filtering, mixing with an ethanol solution and gamma-aminopropyl triethoxysilane, heating, condensing and refluxing, washing and drying, mixing with an amino-terminated polyether and N,N-dimethylformamide and heating; and the application can improve the wear-resistance stability of the alloy lining plate.

The utility model relates to the field of refractory industry, in particular to the production of unfired fireclay refractory products intended for lining kilns and heating units. The technical problem solved by this utility model is to increase the strength of unfired fireclay refractories and reduce energy costs for the preliminary fine grinding of silicate lump, fireclay and hardener, since the hardener proposed is finely dispersed slag from the production of low-carbon ferrochrome, which is a large-tonnage waste product of ferroalloy production. In the proposed method, the stated objective is achieved by the fact that in the method for producing unfired fireclay refractories by grinding silicate lumps with fireclay and a hardener, mixing the resulting binder with a fireclay filler, mixing with water at a temperature of 60-70°C and with superplasticizer C-3, final mixing, molding by pressing at a pressure of 20 MPa and drying at a temperature of 200-225°C, During milling, finely dispersed slag from the production of low-carbon ferrochrome is added as a hardener. The best strength properties of unfired fireclay refractories are achieved after drying in a drying chamber at a temperature of 225°C. Further increasing the drying temperature to 250°C and above does not significantly affect the strength properties of unfired fireclay refractories, but does increase energy costs.

The application provides a Q690qENH coating-free bridge steel welding wire, a flux core and a cladding metal, and belongs to the field of welding materials.The raw material of the flux core comprises, in terms of weight parts, titanium dioxide: 3.0-3.5 parts, silicon-zirconium-iron: 3-6 parts, sodium-calcium-silicate: 0.6-1.2 parts, potassium-sodium titanate: 0.3-0.5 parts, magnesium powder: 0.1-0.6 parts, metallic titanium: 0.1-0.3 parts, metallic manganese: 1-3 parts, nickel powder: 0.8-1.4 parts, copper powder: 0.10-0.40 parts, chromium-iron: 0.5-0.8 parts, molybdenum-iron: 0.3-0.6 parts, aluminum oxide: 0.2-0.4 parts, iron powder: 0.6-2.0 parts, and manganese-silicon alloy: 0.4-0.8 parts, so as to solve the problem that the welding material in the prior art is not suitable for the welding of the Q690qENH coating-free bridge steel.

This invention provides a molybdenum-vanadium-aluminum-chromium-iron master alloy, its preparation method, and its applications. The master alloy comprises the following components in the indicated mass percentages: Mo: 27%-34%, V: 24%-30%, Al: 24%-36%, Cr: 3%-8%, Fe: 4%-8%, and unavoidable impurities. The master alloy has a melting point of 1500℃-1520℃ and a density of 4.90 g·cm³. ‑3 -5.00 g·cm ‑3 The particle size D90 is 0.010mm-0.050mm. The molybdenum-vanadium-aluminum-chromium-iron master alloy of this invention is prepared by a one-step method + radio frequency plasma spheroidization technology. It has uniform composition and particle size, small elemental segregation and low impurity content, which can effectively reduce ingot segregation generated during titanium alloy smelting. This master alloy has good application prospects and large-scale promotion potential in the field of TC18 titanium alloy.

The application provides a kind of excellent pitting-resistant nickel-based electrode, including welding core and electrode coating powder coated on the surface of welding core, and each component of the electrode coating powder comprises, by weight percentage, 35-50% of sodium hexafluoroaluminate, 25-35% of barium carbonate, 5-10% of 95% rutile, 1-2% of rutile titanium dioxide, 5-10% of quartz, 4-6% of 70% micro-carbon chromium iron, 3-5% of niobium iron, 1-3% of manganese iron, 1-1.5% of calcium alginate, 0.5-1% of alkali surface.The electrode uses special welding core and adds a certain proportion of Nb and other alloy elements through the electrode coating powder formula, adjusts the chemical composition of the electrode deposited metal, realizes the characteristics that the electrode deposited metal has excellent mechanical properties and corrosion resistance, effectively improves the operability during manual welding, improves the welding efficiency and reduces the repair rate.

The present application relates to a kind of high alloy steel using continuous casting production φ650mm big round billet method, belong to metallurgical casting technical field.To solve the problem that alloy component precision control is difficult, easy to produce casting billet defect and the continuity of production is insufficient in existing continuous casting process, the present application provides a kind of high alloy steel using continuous casting production φ650mm big round billet method, including using converter or electric furnace smelting, tapping and joining aluminium ingot and first batch low chromium alloy control in place chromium≤1.5%;Using multiple batches to join low-carbon chromium iron to refine, to the vacuum treatment and feeding silicon calcium line calcium treatment of refined molten steel;When continuous casting, using crystallizer electromagnetic stirring and terminal electromagnetic stirring, according to superheat and draft speed dynamic matching control draft speed, using specific pull straightener pressure curve.The present application optimizes multiple processes, accurately controls component, improves the quality inside and outside casting billet, guarantees production continuity, improves efficiency, reduces cost, realizes large-scale efficient production.

This invention discloses a DC grounding electrode feeder element material and its preparation process, relating to the field of feeder element materials. The process involves drying high-silicon ferrochrome material and alloy element powder at 70-80℃ until the water content is <0.1% to avoid porosity during melting, resulting in a mixed powder. This mixed powder is then placed in a medium-frequency vacuum induction furnace for melting to obtain a molten liquid. During melting, the vacuum degree is ≤10. ‑3 To reduce oxidation and impurity gases, the material is first heated to 1200℃ (melting point of high-silicon ferrochrome) at a heating rate of 3-8℃ / min and held for 10-30 min. Then, it is heated to 1600-1800℃ at a heating rate of 9-15℃ / min and held for 10-20 min. The molten metal is then poured into a casting and cooled in an inert atmosphere to obtain the final product. This invention introduces alloying elements to regulate the material composition and microstructure. By studying the casting production process, it suppresses undesirable phenomena such as porosity and cold shuts caused by casting, thereby improving the overall performance of the grounding electrode material.