74 results about "Ferromolybdenum" patented technology

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, 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 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 belongs to the technical field of welding, and relates to an 800 MPa-grade high-strength steel large heat input welding flux-cored wire and a preparation method and application thereof.The flux-cored wire comprises a coating layer and a core material, and the core material comprises, by weight, 15%-23% of low-carbon ferromanganese powder, 7%-8% of aluminum powder, 12%-18% of nickel powder, 6%-8% of calcium fluoride, 4%-6% of quartz, 5%-6% of rutile and the balance iron powder. 7-10% of ferromolybdenum, less than or equal to 3% of ferroboron, less than or equal to 2% of ferrotitanium, 0.5-1% of ferrochromium and the balance of reduced iron powder; and the coating layer is made of low-carbon steel. Under the high heat input welding condition of 200-400 kJ / cm electro-gas welding, the tensile strength of weld metal is larger than or equal to 800 MPa, and the impact energy at the temperature of 20 DEG C below zero is larger than 70 J.

The invention relates to the technical field of welding materials, in particular to a composite carbide reinforced single-tooth roller surface high-temperature wear-resistant flux-cored wire. According to the specific technical scheme, the flux core is prepared from, by mass, 5%-10% of graphite, 20%-50% of high-carbon ferrochrome, 2%-5% of silicon carbide, 2%-6% of tungsten carbide, 1%-4% of electrolytic manganese, 10%-20% of ferrocolumbium, 3%-7% of ferrovanadium, 15%-25% of ferromolybdenum 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 and high-temperature abrasion resistance.

The present invention discloses a molybdenum-containing heat-conducting austenitic manganese steel and a preparation method thereof, which relates to the technical field of molybdenum-containing manganese steel and comprises the following processes: mixing pig iron and pure iron and melting them; adding ferrochrome, ferromanganese, ferromolybdenum, ferrotitanium, ferroniobium and chromium nitride, and continuing to melt to form molten steel; discharging the furnace and casting to obtain a blank; and performing heat treatment to obtain austenitic manganese steel. By adding element molybdenum to the manganese steel, carbides are formed with carbon in the manganese steel and are dispersed in the steel, which can optimize the morphology and distribution of carbides in the austenitic manganese steel, reduce defects in the manganese steel, and inhibit dislocation movement, which helps to improve the thermal conductivity of the manganese steel; at the same time, solute atoms around it are depleted, which can further improve its thermal conductivity.

The invention discloses a low-cost high-toughness pitting-resistant stainless steel powder-cored wire and a cladding layer and application thereof.The cladding layer is made of the low-cost high-toughness pitting-resistant stainless steel powder-cored wire, the powder-cored wire comprises a steel belt skin and a powder core material, and the powder core material comprises, by mass, 30%-35% of manganese powder, 20%-25% of high-carbon ferrochrome, 5%-10% of iron powder, 5%-10% of iron powder, 5%-10% of iron powder, 5%-10% of iron powder and the balance iron powder. The material comprises, by mass, 1%-2% of nickel powder, 16%-23% of ferromolybdenum, 0.5%-1% of ferrosilicon, 14.5%-22% of nitrided ferrochrome and the balance atomized iron powder, and the sum of the mass percent of the components is 100%. According to the cladding layer, the cladding layer has a Cr-Mn sequential double passivation corrosion mechanism through component regulation and control, the pitting corrosion resistance is good, meanwhile, it is guaranteed that the cladding layer has good mechanical performance, and the preparation cost is greatly reduced; the welding wire is free of splashing in the cladding process, a prepared cladding layer and a base material have a good combination effect, forming is attractive, the surface is free of defects such as air holes, and the interior is free of air holes after polishing.

The invention relates to a thermal fatigue resistant commercial vehicle brake disc and a preparation method thereof. A preparation method of the thermal-fatigue-resistant commercial vehicle brake disc comprises the steps that S1, raw materials are added into a smelting furnace to be smelted, and molten iron is obtained; s2, a ferrosilicon inoculant, a nitriding agent, ferromolybdenum and tin are added into a transfer ladle, and molten iron is injected into the transfer ladle for primary inoculation treatment; the use amount of the ferrosilicon inoculant is 0.30-0.45% of the mass of the molten iron, the use amount of the nitriding agent is 0.60% of the mass of the molten iron, the use amount of the ferromolybdenum is 0.60-0.65% of the mass of the molten iron, and the use amount of the tin is 0.06% of the mass of the molten iron; and S3, the molten iron obtained after primary inoculation treatment is transferred into a pouring ladle, then the molten iron is poured into a cavity of a brake disc pouring mold, a silicon-strontium-zirconium inoculant is added along with the flow during pouring for secondary inoculation treatment, and the brake disc is obtained after cooling.

The invention discloses a preparation method of a full endless rolled high-speed steel working roll, which belongs to the technical field of roll materials, and comprises the following steps: step A, taking waste steel, ferrovanadium, ferrochromium, ferromolybdenum, ferrotungsten, ferrocolumbium and electrode powder as raw materials, and smelting outer-layer molten iron and core molten iron by adopting a line frequency furnace; b, the product manufacturing mode is centrifugal composite manufacturing, after smelting components reach the standard, nitrogen is blown to the bottom of a ladle after discharging, and after nitrogen blowing is finished, outer layer and core pouring is conducted; c, after pouring is completed, a box is opened in a cold mode, and rough machining is conducted after the box is opened in the cold Step D, quenching and heating the roller body and integrally tempering the roller body; and E, after quenching heating is finished, finish machining is conducted, and detection is conducted till a finished product is obtained. The invention meets the rolling line and plate rolling working condition with special requirements on the roller surface.

The invention discloses a seamless flux-cored wire for high heat input welding of weathering resistant steel and a manufacturing method, and relates to the technical field of seamless flux-cored wires. The anti-oxidation layer is made of nickel-based alloy, nickel serves as a base body, chromium, molybdenum and cobalt elements are added, a compact Cr2O3 oxidation film is formed, chromium improves oxidation resistance and corrosion resistance, molybdenum enhances pitting corrosion resistance and high-temperature creep resistance, and high-temperature gas erosion and sulfide corrosion can be effectively resisted; the flux-cored layer internally comprises various metal powder and agents, high-grade rutile can achieve the slagging and arc stabilizing effects, potassium titanate can improve the stability of the welding process, potassium oxide is beneficial for improving the plasticity of weld metal, cracks are not likely to be generated under the welding stress, ferromolybdenum can transition Mo into a weld, and the welding quality is improved. And crystal grains are refined, the weld strength and low-temperature toughness are improved, crack sensitivity is prevented, ferroboron has higher microhardness, and the wear resistance of a surfacing layer is remarkably improved.

The invention discloses a hot rolling process of a high-strength anchor rod steel bar. The hot rolling process comprises the following steps: S1, molten iron pretreatment; s2, molten iron smelting: molten iron, scrap steel and copper are added into a converter, a top-bottom combined blowing converter is adopted for blowing, and the tapping temperature is controlled to be 1620-1670 DEG C, S3, molten iron refining: 4-5 kg / t ferromolybdenum, 2-3 kg / t nickel plate and 1.5-2.5 kg / t ferrovanadium are added into the molten iron in the middle stage of refining; s4, RH vacuum degassing and soft argon blowing, wherein after RH vacuum degassing treatment, a silicon-calcium line is added for purifying molten steel, and then soft argon blowing treatment is conducted; s5, continuous casting: carrying out protective casting on molten steel in the whole process; the temperature of a preheating section is controlled to be 800-900 DEG C, the temperature of a heating section is controlled to be 980-1030 DEG C, and the temperature of a soaking section is controlled to be 1050-1080 DEG C; s7, steel billet rolling; and S8, cooling the anchor rod reinforcing steel bars. The high-strength and high-toughness composite material disclosed by the invention has relatively high strength and toughness and can be completely used under severe natural conditions in the engineering field, and the production method provided by the invention is simple, easy to implement, low in cost and suitable for industrial production.

The present invention provides a welding rod for cold die surfacing, comprising a welding core and a coating. The coating is evenly arranged on the outer periphery of the welding core. The coating is composed of the following raw materials in percentage by mass: 31-33% high-carbon ferrochromium, 15-17% tungsten carbide, 9-11% tungsten powder, 7-8.5% marble, 5-7% ferrovanadium, 4-5.5% ferromolybdenum, 3-4.5% ferroniobium, 3-4% phlogopite, 2-4% manganese silicon alloy, 2-4% ferrosilicon, 2-5% boron carbide, 1-2.5% fluorite, 1-2.5% high-carbon ferromanganese, 0.5-1.2% graphite, and 1-2.5% ferrotitanium. The welding rod has high anti-porosity performance, strong weld hardness after welding, a smooth surface, good pressure-coating properties, high hardness, and good wear resistance and toughness.

This invention belongs to the field of ferromolybdenum alloy smelting technology, specifically relating to a two-stage continuous smelting and casting method and apparatus for ferromolybdenum alloys. This invention couples the aluminothermic rapid reduction reaction with medium-frequency induction refining. The ferromolybdenum alloy liquid is conveyed by gravity through slag blocking and sealing into the medium-frequency refining tundish, completing heat preservation, homogenization, secondary slag removal, and flow stabilization. Subsequently, it is directly and continuously cast into 30-50mm thick ingot-shaped ingots, achieving near-net-shape forming, eliminating crushing and screening. This invention solves the problems of component segregation, high oxygen content, intermittent production, large crushing losses, and severe dust pollution associated with the traditional aluminothermic process for ferromolybdenum. It features a short process, high efficiency, superior quality, environmental friendliness, and high degree of automation. The prepared ferromolybdenum ingots have uniform size, stable composition, and an oxygen content ≤80ppm, and can be directly used in special steel smelting, suitable for the continuous industrial production of high-end ferromolybdenum alloys.

The utility model relates to the technical field of impurity reducing devices, and discloses a high-grade ferromolybdenum quality improving and impurity reducing device which comprises a material frame, one side of the material frame is fixedly connected with a supporting plate, the top of the supporting plate is fixedly connected with a fixing plate, one side of the fixing plate is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a first gear, and the output end of the first gear is fixedly connected with a second gear. The first gear is used for transmitting power; and the supporting rings are fixedly connected to the top of the supporting plate in a front-back symmetry mode, sliding columns are slidably connected to the interiors of the two supporting rings correspondingly, and first racks are fixedly connected to one ends of the two sliding columns correspondingly. According to the device, the first motor and the first gear drive the transmission column and the crushing roller structure to work, so that the effect of adjusting the crushing distance according to requirements is achieved, and the problem that some ferromolybdenum cannot be effectively crushed or the crushing effect is not ideal due to the fact that the distance between the crushing rollers cannot be adjusted according to the required particle size is solved; therefore, the impurity reducing efficiency is improved.

The invention discloses a molybdenum alloy total molybdenum content detection method based on a lead molybdate gravimetric method. The method comprises the following steps: dissolving a ferromolybdenum alloy sample through a nitric acid-potassium chlorate saturated solution and the like, carrying out lead molybdate precipitation through ammonia water, an acetic acid-ammonium acetate buffer solution, lead acetate and the like, carrying out high-temperature gradient sintering on filter residues through a mixed solvent of anhydrous sodium carbonate and zinc oxide, and determining residual molybdenum through a potassium thiocyanate spectrophotometric method after dissolving. And performing correction calculation. According to the method, a gravimetric method and a spectrophotometric method are combined for use, the filter residues are corrected, the precipitation process technology is optimized, the problems that a traditional method is tedious in operation and large in residual molybdenum error of the filter residues are solved, and high-precision, high-efficiency and low-cost molybdenum content detection is achieved.

The invention relates to the technical field of welding materials, in particular to a hardfacing flux-cored wire for repairing the surface of a single-tooth roller. According to the specific technical scheme, the flux core is prepared from, by mass, 5%-15% of graphite, 20%-60% of high-carbon ferrochrome, 3%-10% of silicon carbide, 2%-15% of tungsten carbide, 1%-6% of electrolytic manganese, 5%-20% of ferromolybdenum and the balance Fe powder. According to the flux-cored wire, surfacing alloy obtained through electric arc surfacing is good in surfacing manufacturability, weld joint forming is attractive, the number of surface air holes is small, and the flux-cored wire further has high hardness and abrasion resistance.

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 provides iron-based nanocrystalline soft magnetic alloy powder, a soft magnetic composite material and a preparation method of the iron-based nanocrystalline soft magnetic alloy powder and the soft magnetic composite material, and belongs to the technical field of soft magnetic materials. The iron-based nanocrystalline soft magnetic alloy powder is of 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 in the order of magnitude of 1019-1020 m <-3 >. The iron-based nanocrystalline soft magnetic alloy powder has the advantages of being high in sphericity degree, high in saturation magnetization intensity, low in coercive force and the like. The soft magnetic composite material comprises soft magnetic powder and a coating layer coating the surface of the soft magnetic powder, the coating layer comprises a binder, and the soft magnetic powder is formed by compounding the iron-based nanocrystalline soft magnetic alloy powder provided by the invention 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 the magnetic core has the advantages of low high-frequency loss, high magnetic conductivity, high direct-current bias and the like.

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.

The application belongs to the technical field of molybdenum iron smelting equipment, and particularly discloses a high-temperature-resistant foldable molybdenum iron smelting automatic slag discharging device, which comprises a slag poking unit and a folding unit, the folding unit comprises a base and a folding beam, one end of the folding beam is hingedly connected with the base through a hinge assembly, the other end of the folding beam is detachably connected with the slag poking unit, under the action of the hinge assembly, the folding beam can drive the slag poking unit to fold or unfold relative to the base, the slag poking unit comprises a sliding frame, a sliding table and a drill rod, the drill rod is movably connected with the sliding table at the bottom of the sliding frame, under the action of a driving mechanism, the drill rod can move forward relative to the sliding frame so that the front end of the drill rod is stretched out to quickly poke through hard slag crust and taphole clay blocking objects to realize slag discharging, after the drill rod pokes through the hard slag crust and the taphole clay blocking objects, the drill rod moves backward relative to the sliding frame so that the front end of the drill rod is quickly retracted, the device is prevented from being damaged by high-temperature molten slag, automatic operation and remote control of the slag discharging operation are realized, and the safety risk is reduced.

The present invention relates to a method for controlling the carbon content of L415 pipeline steel, belonging to the field of steelmaking. The method adopts a process route of combined blowing converter → LF refining → RH refining → continuous casting. The present invention provides a method for controlling the carbon content of L415 pipeline steel, which adopts a process route of converter steelmaking, LF refining, RH refining, and continuous casting to obtain molten steel with qualified composition and temperature, thereby resolving the dependence of L415 pipeline steel on low-carbon ferrochrome, ensuring smooth production scheduling of L415 pipeline steel, and reducing production costs. The present invention provides a method for controlling the carbon content of L415 pipeline steel. Through system planning, the carbon content at the converter endpoint is controlled at 0.03-0.04%, low-carbon ferromanganese, ferrosilicon, and ferromolybdenum are used for steel tapping, high-carbon ferrochrome, ferroniobium, and ferrotitanium are used in the LF refining process, and submerged arc operation is performed throughout the process, thereby achieving the purpose of controlling the carbon content of L415 pipeline steel to ≤0.08%.

The invention belongs to the technical field of ship steel, and relates to a production process of marine stainless steel. The invention aims to solve the problems that the marine stainless steel is difficult to restrain local corrosion and poor in long-term sanitary performance. According to the method, an electric arc furnace is used for smelting iron ore, ferronickel, ferrochrome, ferromolybdenum and smelting auxiliaries, and refined molten steel is obtained after impurity components in the molten steel are accurately adjusted through decarburization treatment, chemical desulfurization, vacuum desulfurization and low-temperature dephosphorization; then the refined molten steel is subjected to steel ladle alloying, the element composition of the molten steel is further adjusted, and the purity and the structure uniformity of the stainless steel are deeply improved through the vacuum degassing and electroslag remelting processes; and the prefabricated stainless steel subjected to hot rolling forming is subjected to solution annealing and passivation polishing, the internal structure of the steel is further optimized, the surface performance is improved, and the marine stainless steel is obtained. The marine stainless steel provided by the invention is high in corrosion resistance, can effectively inhibit local corrosion, and has lasting sanitation performance in a ship environment.

The utility model discloses a flue gas absorption device for ferromolybdenum roasting, which relates to the technical field of flue gas absorption and comprises a bottom plate and two hydraulic cylinders, the two hydraulic cylinders are fixedly arranged on two sides of the upper surface of the bottom plate, a fixing shell is arranged on the upper side of the bottom plate, and the tail ends of piston rods of the hydraulic cylinders are fixedly connected with the fixing shell. An air inlet pipe and an air outlet pipe are fixedly arranged on the two sides of the fixing shell respectively, an opening is formed in the bottom of the fixing shell, a sealing plate is rotationally arranged in the opening, and transmission mechanisms for driving the sealing plate to rotate are arranged on the two sides of the upper surface of the bottom plate. The bottom plate can be overturned, so that foreign matters accumulated on the bottom plate can be conveniently cleaned.

The utility model provides novel ferromolybdenum smelting slag recovery equipment, which relates to the field of ferromolybdenum smelting slag recovery equipment and comprises a screen, double-roller crushing equipment, feeding equipment, ball milling equipment and a discharging groove. The screening equipment and the magnetic separation equipment in the device work synchronously, the magnetic separation effect is comprehensive and stable, and large-granularity metal residues are directly screened and left and finally automatically stored in the large-granularity metal collecting box. Small-particle-size metal residues and other residues sequentially enter the two separation boxes through the arc-shaped filter screen to be subjected to alternate magnetic separation to achieve separation, finally, the separated small-particle-size metal residues and other residues are independently collected into corresponding containers, and in the recycling process, manual checking at one side and manual starting of magnetic separation are not needed. And the recovery effect of ferromolybdenum is further improved.

The application relates to the alloy production technical field, and proposes a process for producing high-strength steel by using scrap steel and nickel plates, which comprises the following steps: S1, performing shot blasting rust removal treatment on the scrap steel, performing baking treatment on the nickel plate and the alloy respectively, and obtaining the treated scrap steel, the nickel plate and the alloy; S2, smelting the treated scrap steel, the nickel plate and the alloy, adding slagging materials to perform slagging during the smelting process, and obtaining molten steel after the smelting is completed; S3, adding vanadium iron into the molten steel to perform refining, and obtaining refined molten steel; S4, transferring the refined molten steel to a ladle, adding aluminum wire and silicon-calcium wire for deoxidation treatment, and then performing continuous casting to obtain continuous casting billets; and S5, performing heat treatment on the continuous casting billets to obtain high-strength steel; the alloy is chromium iron, molybdenum iron, silicon iron and manganese iron. Through the above technical scheme, the problems of dendrite deflection, cracks, coarse grains and long heat treatment process period of the steel plate in the prior art are solved.

The present invention provides a flux-cored welding wire and a preparation method thereof, comprising: a steel strip and a flux core, wherein the flux core is filled in the steel strip; the flux core comprises the following raw materials in percentage by mass: 7-10% low-carbon ferrochrome, 3-5% high-carbon ferrochrome, 7-10% metallic manganese, 5-7% ferromolybdenum, 4-6% rutile, 40-55% fluorite, 3-5% quartz, 1-2% potassium feldspar, 1-2% potassium fluozirconate, 2-3% calcium silicate powder, 3-5% magnesium powder, 3-4% 45% ferrosilicon, and the balance is atomized iron powder. The flux-cored welding wire provided by the present invention can, during welding, improve slag fluidity, reduce slag spatter, and enhance arc stability, thereby optimizing welding process performance; and can also enhance the high-temperature oxidation resistance and corrosion resistance of the high-deposited metal, resulting in a weld with excellent thermal crack resistance and low-temperature toughness, thereby making the weld of heat-resistant steel more adaptable to harsh environments of high temperature, high pressure, and steam corrosion.

This invention relates to the field of waste gas treatment, specifically a composite waste gas purification and treatment device for ferromolybdenum smelting. The invention includes a housing with two symmetrical chambers inside. Each chamber contains a bag filter assembly, and a symmetrical pulse assembly is positioned above the bag filter assembly. Below the pulse assembly, two symmetrical sealing cloths are connected via telescopic pipes. A rotating partition is rotatably connected between the bottoms of the two chambers. When one chamber is being cleaned, the other chamber continuously purifies the waste gas, ensuring that cleaning and purification do not interfere with each other, thus improving cleaning efficiency. Furthermore, the cleaned chamber experiences only unidirectional airflow, effectively preventing bag blockage and allowing the waste gas to pass more smoothly through the bag filter assembly, thereby improving the purification quality and efficiency.

The present application relates to a kind of rare earth metal-containing powder core flux-cored wire for X80 pipeline steel, belong to the technical field of flux-cored wire for gas protection.The rare earth metal-containing powder core flux-cored wire for X80 pipeline steel is composed of carbon steel strip and metal powder core, the metal powder core is composed of the following raw materials by weight percentage, medium carbon manganese iron 10-15%, nickel powder 10-15%, 75 ferrosilicon 4-8%, ferromolybdenum 4-6%, ferrotitanium 1-3%, yttrium oxide 2-5%, aluminum magnesium alloy 1-3%, and the balance is iron powder.The beneficial effect is that the Si-Mn-Mo-Ni alloy system welding wire can be used for the backing welding, filling welding and cap welding of X80 low alloy high strength steel, there is basically no spatter during welding, and full position welding can be realized, the low temperature toughness is good, and the diffusion hydrogen content is extremely low.

The invention relates to a production method for improving the flaw detection qualification rate of large-specification H13. The production method comprises the following steps of converter, LF refining, VD, continuous casting, hot delivery, casting blank heating, rolling, slow cooling and annealing. The converter process comprises the steps that converter blowing is conducted for 3-5 minutes, earlier slag is poured out, slag charge is added for secondary slagging smelting, slag is poured again after blowing is conducted for 5-7 minutes, slag charge is added for tertiary slagging smelting, lime, light-burned dolomite and limestone are added in the whole converter smelting process, oxygen consumption is 55-60 m < 3 > / t, and the oxygen supply time is 20-25 minutes; the tapping temperature of the converter is 1590-1620 DEG C, the tapping [C] is 0.03-0.06%, the tapping [P] is less than or equal to 0.007%, the tapping time is 4-7 minutes, and low-titanium alloy and low-titanium refined pre-melted slag are added in the tapping process; steel grit aluminum, low-carbon ferrochrome, low-titanium low-calcium ferrosilicon, ferromolybdenum, lime and low-titanium refined pre-melted slag are sequentially added in the tapping process, slag tapping is strictly prohibited in the tapping process, and the content of [Ti] in refined molten steel is smaller than or equal to 10 ppm. The flaw detection of 150-250 round H13 rolled metal produced by the method meets the GB / T4162 B-level requirements.