49results about How to "Reduce segregation" patented technology

The invention belongs to the technical field of bar production, and particularly relates to a production method of a steel bar for a heavy-load automobile half axle, and the steel bar comprises the following chemical components in percentage by mass: 0.39-0.42% of C, 0.25-0.35% of Si, 1.45-1.70% of Mn, less than or equal to 0.013% of P, less than or equal to 0.006% of S, less than or equal to 0.25% of Cr, less than or equal to 0.25% of Ni, 0.15-0.20% of Mo, 0.06-0.10% of V, less than or equal to 0.15% of Cu and the balance of Fe and inevitable impurities. The method has the advantages that high-performance, high-purity and low-cost production of the steel bar for the heavy-duty automobile half shaft is realized through green short-process production of'ecological electric furnace + LF + RH + continuous casting 'in combination with low-carbon component design and a controlled rolling and controlled cooling process. And macrostructures and non-metallic inclusions of the finished steel meet the requirements of high-end products.

The application relates to a copper-manganese alloy material preparation equipment technical field, in particular to a copper-manganese alloy material smelting furnace, which comprises a base, a main machine and a crucible pouring furnace, the crucible pouring furnace comprises a crucible furnace and a furnace cover, a furnace cavity is arranged in the crucible furnace, a U-shaped heating pipe is arranged at the bottom of the furnace cavity, a ceramic partition plate is arranged in the furnace cavity, the ceramic partition plate is arranged in a cross shape, the furnace cavity is divided into a feeding area, a heating area, a transfer area and a pouring area by using the high-temperature-resistant ceramic partition plate, copper metal powder, manganese metal powder and argon are sealed into the feeding area, so that the raw materials are fully mixed and uniformly distributed in the feeding area; after the raw materials are heated by the U-shaped heating pipe of the high-frequency induction heating to form a metal liquid in the heating area, the metal liquid is poured out after passing through the transfer area and the pouring area; and while the metal liquid is poured out in the pouring area, new raw materials are added in the feeding area for processing, so that the pouring and output of the metal liquid can be continuously carried out in the whole process.

This utility model discloses an electroslag remelting furnace for mold steel, relating to the field of metallurgical technology. It includes a base, a coil, and a lifting mechanism. A multi-stage crystallizer is fixedly installed on the base. The multi-stage crystallizer consists of multiple individual crystallizers, each with its own cooling chamber. A mounting base is fixedly installed at the upper end of the multi-stage crystallizer, and a sealing mechanism is fixedly installed at the upper end of the mounting base. The beneficial effect lies in the fact that the weight of the electrodes is detected by a pressure sensor. Based on the change in electrode weight, the magnitude of the magnetic field generated by the coil is adjusted, thereby improving the flow of the molten pool within the multi-stage crystallizer, reducing segregation, and preventing excessive turbulence that could lead to slag entrapment. Furthermore, the independent crystallizers and individual cooling chambers allow for different melting processes of the electroslag in different areas, avoiding uneven cooling or temperature imbalance during the melting process and effectively improving the crystallization quality of the product.

The invention relates to the field of metallurgy, and discloses a large-size maraging stainless steel bar and a preparation method thereof, the diameter of the bar is larger than or equal to 300 mm, and the method comprises a vacuum induction melting stage, a vacuum consumable remelting stage, a fast forging cogging stage and a precision forging forming stage; wherein the vacuum consumable remelting stage comprises an arcing stage, a stable smelting stage and a filling smelting stage; in the arc starting stage, a molten pool is formed by adopting a current of 8-12 kA; in the stable smelting stage, the smelting speed is 4.2-4.8 kg / min, the molten drop is 3-5 s <-1 >, the molten drop short-circuit time is 0.6-0.8 s, and inert gas is started to be filled for cooling after smelting is conducted by the preset weight; and in the filling smelting stage, inert gas filling is stopped, and the current and the melting speed are controlled to descend in a stepped mode. According to the method, the uniformity of components and structures can be improved, so that the mechanical property of the large-size maraging stainless steel bar is improved.

The application relates to the technical field of bolts, and discloses a heat treatment process for high-strength bolts, which comprises the following steps: obtaining high-strength bolts after vacuum air quenching, tempering and cooling of bolt blank materials; the bolt blank materials are composed of the following components in percentage by weight: C 0.1%-0.15%, Mn 0.4%-0.6%, Mo 0.25%-0.35%, W 0.05%-0.15%, Ti 0.2%-0.3%, Co 0.15%-0.25%, Yb 0.05%-0.1%, Mg 0.15%-0.25%, V 0.08%-0.12%, Eu 0.05%-0.15%, Se 0.03%-0.06%, and the balance is Fe and other inevitable impurities. Through the technical scheme, the problem of poor mechanical properties of bolts in the related art is solved.

The invention discloses a processing method of a large-diameter seamless steel pipe for a nuclear power conventional island. The method comprises the following steps: preparing and smelting raw materials; a centrifugal casting step; post-processing the pipe blank; a finish machining and detection step; the centrifugal casting comprises the following steps: a casting mold pretreatment stage; a centrifugal casting stage; in the pipe blank cooling and solidifying stage, the rotary hot extrusion part is introduced into an inner cavity of the pipe blank, the outer wall of the rotary hot extrusion part is further coated with a heat insulation coating, and when the rotary hot extrusion part rotates, at least one working part on the outer wall of the rotary hot extrusion part and the inner wall of the pipe blank periodically move close to or away from each other in the radial direction; therefore, the rotary hot extrusion part can apply periodic radial compaction force to the inner wall of the pipe blank. Acting force can be directly applied to the inner wall of the hollow pipe blank in the cooling and solidification stage of the hollow pipe blank, the quality of the inner wall is fundamentally improved, and the hollow pipe blank of the high-quality large-diameter seamless steel pipe with the smooth inner wall, the compact structure and the uniform performance is produced.

This invention discloses a sulfide-reinforced alloy powder for plasma spraying and its preparation method. The method includes: dispersing alloy matrix powder in a water / alcohol mixed solvent for surface activation to obtain activated alloy powder; adding the activated alloy powder to a sulfur-containing coordination reaction solution containing a sulfur-containing coordination precursor, a transition metal salt, and layered sulfide nanosheets for liquid-phase coordination deposition to form a discontinuous deposition layer with a metal-sulfur coordination structure; then performing low-temperature sulfidation heat treatment under a nitrogen atmosphere to transform the discontinuous deposition layer into a transition metal sulfide interface layer, anchoring the layered sulfide nanosheets therein; finally, drying, dispersing, shaping, and sieving to obtain the target alloy powder. The alloy powder obtained by this invention can improve the sulfide retention rate and lubricating phase distribution uniformity after spraying, and improve the coating bonding strength and friction-reducing and wear-resistant properties.

The application provides a kind of X80 grade high toughness high hydrogen-induced cracking resistance thick wall LNG receiving station seamless steel pipe steel and its heat treatment process, composition: C 0.03%~0.06%, Mn 1.30%~1.50%, Cr 0.20%~0.50%, Mo 0.40%~0.60%, Ni 0.20%~0.40%, V 0.080%~0.150%, Nb 0.010%~0.030%, Al 0.015%~0.025%, P≤0.012%, S≤0.008%, N 0.0060%~0.0100%, T.O≤0.0020%, the rest is Fe and other inevitable impurities, cooperate heat treatment process production, with good strength and toughness and hydrogen-induced cracking resistance performance.

This product relates to the field of nanomaterials and phase change energy storage material preparation technology, and discloses a method for preparing two-dimensional semiconductor phase change energy storage masterbatch. The method involves surface organic functionalization of molybdenum disulfide nanosheets, followed by assembly with surface-hydroxylated boron nitride nanosheets to form a two-dimensional heterogeneous layered framework with interconnected interlayer gaps. Molten fatty acid phase change components are introduced into the interlayer gaps, and after cooling, confined phase change composite particles are obtained. These particles are then coated with a vinyl copolymer containing anhydride grafted segments, and subsequently melt-blended with a thermoplastic carrier resin, extruded, and pelletized. The resulting masterbatch maintains the two-dimensional interlayer contact structure, inhibits interlayer aggregation and melt migration of the phase change components, and improves the continuity of heat transfer, the uniformity of photothermal conversion, and the stability of cyclic thermal storage.

This invention relates to a method for producing low-density, high-strength, and high-toughness protective steel plates from continuously cast billets, belonging to the field of metallurgy. The steel plate is an Fe-Mn-Al-C series austenitic low-density steel plate with an austenitic matrix supplemented by dispersed fine precipitated carbides, achieving high strength and high toughness, thus meeting the requirements for ballistic protection. The steel plate has a production thickness of 6-12 mm, a width of 1600-3000 mm, and a density of 6.75-7.05 g / cm³. 3 It has a density 7.85 g / cm³ higher than that of conventional steel. 3 The steel plate exhibits at least a 10% reduction in weight, good machinability and weldability, and excellent ballistic protection performance. A 6mm thick steel plate meets the NATO AEP STANAG 4569 standard Level I ballistic protection requirements, while a 12mm thick steel plate meets the NATO AEP STANAG 4569 standard Level II ballistic protection requirements. Production process: smelting—continuous casting—slow cooling—rolling—heat treatment—finishing—inspection—warehousing.

This invention discloses a 6-series energy-absorbing aluminum alloy and its manufacturing method. The aluminum alloy, by mass percentage, comprises: Mg: 0.50–1.20%, Si: 0.40–1.00%, Mn: 0.15–0.95%, Cr: 0–0.25%, Fe: 0.15–0.45%, Ti: 0.015–0.30%, and Cu: 0.10–0.70%; wherein the Mg / Si mass ratio is ≥0.85 / 1, and the total content of Mn+Cr+Fe is ≤1.2%; it also includes an AlTi5C0.25 grain refiner and impurities with a content not exceeding 0.15%, with the balance being Al. This invention optimizes and precisely designs the content of the main alloying elements in the alloy, and introduces TiC nanoparticles using the AlTi5C0.25 grain refiner, enabling the aluminum alloy profile to possess both high strength and excellent crushability.

The invention discloses a hot rolling production method of low-cost pure hydrogen delivery pipeline steel L360MH, which adopts a low-carbon equivalent design to remarkably improve weldability and hydrogen embrittlement resistance. Ti / Nb composite microalloying refined grains are added, so that a high-density nanoscale carbonitride precipitated phase is formed and effectively serves as a'hydrogen trap ', and hydrogen diffusion is inhibited; meanwhile, the content of P (smaller than or equal to 0.013%) and the content of S (smaller than or equal to 0.0015%) are strictly controlled, impurity segregation is reduced, and hydrogen induced cracking (HIC) sensitivity is reduced; through a controlled rolling and controlled cooling (TMCP) process, fine and uniform ferrite and a small amount of pearlite structures (the grain size of the ferrite is greater than or equal to 9 grades) are obtained; a high-proportion small-angle grain boundary and a uniform precipitated phase hinder crack propagation, so that the steel is endowed with excellent low-temperature toughness (the impact energy at-10 DEG C is more than or equal to 200J) and high hydrogen embrittlement resistance; and the structure uniformity also guarantees the strength stability (the yield strength is greater than or equal to 390MPa), and the mechanical requirements of pure hydrogen transportation are met.

A single-inlet feeding steel silo anti-segregation guiding device is disclosed. The steel silo employs a single-inlet feeding system. A guide frame is fixedly installed below the inlet inside the silo. The guide frame includes four columns, on which a multi-layered receiving and guiding structure, evenly distributed vertically, is fixedly connected. Each receiving and guiding structure includes a U-shaped frame composed of four horizontal bars at the same horizontal height. A receiving plate is welded to the U-shaped frame, located on one side of the U-shape. The portion of the U-shape not covered by the receiving plate serves as the material outlet. In two adjacent layers of receiving and guiding structures, the lower layer's outlet corresponds to the upper layer's receiving plate. Left and right baffles, vertically oriented, are welded between the two columns at the ends of the receiving plates furthest from the outlet. The height of the left and right baffles is lower than the height between the two layers of the U-shaped frame, forming a right-angled fold with the receiving plate. This device, when installed inside the steel silo, effectively reduces material segregation.

This invention discloses a device and method for the co-processing of tailings and waste rock, backfilling and compaction, and in-situ quality testing, belonging to the field of resource utilization of mining solid waste. Tailings, waste rock, and large particulate waste are weighed and then enter a screening, dewatering, and water treatment and recycling system III. After dewatering, the tailings enter a tailings and solidifying agent mixing system IV, where it is mixed with one or more solidifying agents and / or reinforcing materials transported by a solidifying agent storage system V to form a slurry. The slurry enters a slurry backfilling bin through a silo conveying port and a slurry input channel. After being stirred again in the backfilling bin, it is guided and shaped by a plastic sheet and compacted by a walking compaction wheel. The screened waste rock enters a five-stage waste rock grading screening bin. The in-situ quality testing system samples and tests the strength of the backfilled and compacted area. This invention achieves integrated continuous operation of tailings and waste rock weighing and batching, screening and dewatering, solidification and mixing, slurry backfilling and shaping, waste rock damming, tailwater reuse for dust suppression, and backfill quality testing.

This utility model relates to the field of road paving technology and discloses a quick-release paver anti-segregation rubber baffle, including a rubber plate. Rectangular and L-shaped iron plates are respectively arranged on both sides of the rubber plate. Multiple iron chains are arranged at the bottom of the L-shaped iron plate. Multiple rubber fixing bolts, connecting bolt one, and connecting bolt two are threadedly connected inside the rectangular iron plate. One end of each of the multiple rubber fixing bolts extends through the interior of the rubber plate, and one end of each of the multiple connecting bolt two extends through the rubber plate and into the interior of the L-shaped iron plate. Multiple U-shaped buckles are arranged at the bottom of the L-shaped iron plate. In this utility model, the modular rubber plate and iron chains work together to adapt to the needs of different road conditions and are compatible with different gradations of water-stabilized mixtures. This significantly improves the smoothness and uniformity of the water-stabilized layer paving, reduces the risk of later reflective cracking, and simultaneously reduces material waste and the probability of rework.

The solidification weld line is a comprehensive manifestation of the casting and rolling process. Addressing the "Ɔ"-shaped phenomenon of the solidification weld line in traditional casting and rolling processes, which leads to edge cracking and low yield in conventional cast and rolled sheets, this invention discloses a special electromagnetic casting roll for magnesium alloy casting and rolling. The roll includes a roll core, a roll sleeve, and end caps. A coil is uniformly wound between each water channel on the roll core, and a coil is uniformly wound inside the roll sleeve. The end caps are made of composite ceramic material, and an insulating gasket is placed between the end caps and the coils to ensure good insulation. A pre-reserved groove on the end caps is used to adjust the energization of the coils on the roll core. The annular coil is connected to a brush to ensure smooth external power supply to the roll core and roll sleeve. The end caps are used to fix the roll core and roll sleeve. This invention can directionally and quantitatively improve the morphology of the solidification weld line and control the temperature of the casting and rolling zone by adjusting the parameters of the pulse current and the casting and rolling process parameters. This effectively reduces segregation, refines grains, and homogenizes the microstructure in cast and rolled strips, thereby improving the yield and product performance of magnesium alloy cast and rolled strips.

The application relates to an aluminum-silicon-strontium-titanium-zirconium alloy and an aluminum-silicon-strontium-titanium-zirconium alloy welding wire prepared from the same and belongs to the technical field of aluminum alloy welding wires. The alloy components and the weight percentages are as follows: Si: 4.50-5.50%; Mg: 0.01-0.05%; Sr: 0.02-0.50%; Ti: 0.01-0.15%; Zr: 0.01-0.20%; La: 0.01-0.10%; Ce: 0.01-0.15%; C: <0.0010%; the balance is Al and inevitable impurity elements, and the content of the inevitable impurity elements is less than 1.0 wt%. The application further discloses an aluminum-silicon-strontium-titanium-zirconium alloy welding wire prepared from the aluminum-silicon-strontium-titanium-zirconium alloy. Through control of the alloy components and the content of each component, the welding wire formed by the application has excellent performance in alloy mechanical properties, casting performance, grain refinement and welding quality.

The invention discloses a production method of a hot-rolled steel plate for a high-grade steel pure hydrogen conveying pipeline. The steel plate comprises the following chemical components in percentage by weight: 0.03-0.06% of C, 0.10-0.20% of S i, 1.10-1.40% of Mn, less than or equal to 0.008% of P, less than or equal to 0.001% of S, 0.040-0.050% of Nb, 0.030-0.040% of V, 0.005-0.020% of Ti, 0.20-0.30% of Cr, 0.10-0.20% of N i, 0.020-0.040% of Al, less than or equal to 1.5 ppm of H, less than or equal to 20 ppm of O, less than or equal to 40 ppm of N and the balance of Fe and impurities. And by combining low-temperature heating and rolling of the plate blank, the produced steel plate has high strength and good hydrogen embrittlement resistance, and the requirements of steel for the high-pressure pure hydrogen conveying pipeline are met.

The invention belongs to the technical field of thin films, and discloses a tin-based thin film and a preparation method and application thereof. The tin-based thin film is formed by depositing a tin-based material through a physical vapor deposition method, the deposition mode is gradient step-by-step deposition, the number n of times of gradient step-by-step deposition is larger than or equal to 2, and technological parameters of gradient step-by-step deposition meet the following relational expressions: when n is equal to 2, the first-time carrier plate moving speed is gt; the last moving speed of the carrier plate; when ngt; when 2, the first-time moving speed of the carrier plate is gt; the carrier plate moving speed gt of the middle times; and the last carrier plate moving speed. According to the method, a gradient step-by-step deposition method of multi-time plate walking is adopted, the thickness and component deviation of single-time plate walking are compensated, multi-time ion bombardment is used for promoting interdiffusion of interface atoms and accelerating lattice diffusion of doped elements, and the density of a surface layer is optimized through segmented deposition; and finally, the tin-based thin film with high uniformity, high crystallinity, strong stability and excellent electrical properties is prepared at low temperature.

The application relates to a method for improving the surface quality of 20CrNiMo forgings, which can effectively improve the surface color difference problem of the 20CrNiMo forgings and improve the product quality. Through high-temperature heating, the composition homogenization is effectively promoted, and the composition segregation phenomenon is reduced. The two roughing + thinning methods and the interchanging of the thickness and width dimensions of the forging are adopted to effectively ensure the compaction effect of the forgings, sufficiently break the coarse organization of the steel ingot, and break the internal dendritic segregation of the steel ingot in the one roughing + thinning deformation + high-temperature homogenization + two roughing + thinning deformation mode for the first time, shorten the diffusion distance between the dendrites, and further promote the organization and composition homogenization, so that the surface color difference quality problem of the forgings is effectively improved. Through the heat treatment after forging, the forging organization is not only refined, but also the internal stress of the forging is removed, so that the mechanical property result reaches the standard requirement.

This invention discloses a secondary design method for the mix proportion of hybrid steel fiber self-compacting concrete based on a customized solid-phase surface filling layer. Starting with a basic mix proportion of fiberless self-compacting concrete, steel fibers are introduced, and a secondary mix proportion design is performed using a secondary design envelope curve to obtain the final mix proportion of the steel fiber self-compacting concrete. This design method can encompass material variations such as different fiber diameters and aggregate systems, and can achieve the mixed incorporation of fibers. This reduces fluctuations in the workability of the mixture caused by material and fiber content, significantly improves stability, optimizes the workability control of fresh self-compacting concrete, greatly reduces the number of mix proportion adjustments, and enables rapid mixing of self-compacting fiber concrete. It provides guidance for the application of fiber concrete and the targeted customization of mix proportions in practical engineering.

The application discloses basalt fiber seawater and sea sand concrete and a preparation method and application thereof, and belongs to the technical field of building materials. The basalt fiber seawater and sea sand concrete is composed of the following components in parts by mass: cement 35-45 parts, sea sand 65-75 parts, gravel 105-120 parts, seawater 15-20 parts, water reducing agent 0.1-0.3 parts and basalt fiber 0.1-1 part. The raw material selection and mix proportion design improve the toughness and crack resistance of traditional concrete. The SEM result shows that the basalt fiber is mixed in the seawater and sea sand concrete, the fiber 'bridges' the cracks and improves the pore connection state, which is beneficial to improving the crack resistance, toughness, salt and alkali environment applicability and residual mechanical properties after high temperature, and the basalt fiber seawater and sea sand concrete can be used for a coastal tunnel shield segment, a FRP concrete structure and repair of existing structures in a marine environment.

This invention relates to the field of magnesium alloy smelting technology, and in particular to a smelting process and apparatus for a semi-solid non-dendritic slurry of rare earth AS-based magnesium alloy. Using AS magnesium alloy as the base material and a Ce-La-Nd ternary rare earth mixture as the rare earth modifier, the process involves vacuum melting, electromagnetic stirring, and stepped cooling to obtain an ingot. A three-dimensional curve is plotted based on the JMAK equation to determine the critical temperature. Using a rheological casting apparatus, through internal cooling gradient, stirring-assisted slurry preparation, and ultrasonic-assisted isothermal treatment, combined with three-level quality judgment and defect closed-loop adjustment, a slurry with controllable liquid phase content, fine and rounded grains, and uniform rare earth distribution is prepared. The process exhibits high repeatability and meets the requirements of high-end semi-solid forming.

This invention discloses a process for manufacturing an impact-resistant and wear-resistant ultra-hard metal-based composite layer and a straightening roller, comprising an alloy groove coating layer one, an alloy groove coating layer two, and an alloy working layer; both alloy groove coating layer one and alloy groove coating layer two have sinusoidal structures, are staggered, and have at least one set of intersection nodes between them, and are located inside the alloy working layer. By introducing V and Nb into the original formulation and precisely adjusting the proportions of components such as Co, Ni, Cr, C, B, and Si to meet the requirements, the composite layer retains high hardness and good oxidation resistance, impact resistance, thermal shock resistance, and corrosion resistance at high temperatures, improving the spraying process performance of the alloy coating and increasing the deposition rate.

This invention relates to the field of non-metallic mine backfilling technology, and particularly to a potash mine solid-liquid tailings-based backfill material and its preparation method. The preparation method of the backfill material includes: mixing potassium phosphate with tailings to obtain a phosphate brine solution; dry mixing composition 1 of a composite binder with the tailings to obtain a uniform dry material; adding the phosphate brine solution to obtain a uniform slurry 1; adding a mineral carrier-loaded slow-release alkali source to the uniform slurry 1 to obtain a uniform slurry 2; first adding a polycarboxylate superplasticizer to the uniform slurry 2 and mixing, then adding an associative thickener solution and mixing, and finally adding anionic polyacrylamide to obtain the backfill material. The backfill material prepared by this invention achieves a coordinated balance between slurry fluidity, anti-segregation, pumpability, and backfill strength, providing an economical, environmentally friendly, and efficient technical solution for backfilling non-metallic mine goaf areas.

This invention belongs to the field of electronic packaging heat dissipation materials technology, and relates to a Bi-Sn-In system low-melting-point alloy thermal interface material and its preparation method. The material is composed of 53% Bi, 42% Sn, and 5% In by mass percentage. The preparation method includes: melting the raw materials at 300-350℃ under high-purity argon protection, followed by cooling at a rate of 5-10℃ / min to obtain a composite structure with a primary Bi-rich dendritic framework and an intergranular low-melting-point eutectic phase; then performing a low-temperature stabilization treatment at 100-110℃. This process enables the material to form a stable composite structure of "solid dendritic network + liquid eutectic phase" within the semi-solid working range, where the solid dendritic network provides mechanical support and inhibits pumping out, and the liquid eutectic phase ensures excellent thermal interface wetting and heat transfer performance. The material prepared by this method has a low melting point, high thermal conductivity, and good dimensional stability. The process is simple and suitable for the industrial production of heat dissipation interfaces for electronic devices.

The present application relates to a kind of wear-resistant hydrophobic coating and its preparation method, belong to the technical field of A.A kind of preparation method of wear-resistant hydrophobic coating includes the following steps: the metal substrate after cleaning is pretreated, is placed in vacuum coating furnace and is preheated, ion etching, using Ti-Cr composite target material is carried out Ti-Cr composite sputtering treatment, WC target sputtering treatment, then carries out multi-arc ion plating deposition ta-C layer processing and multi-arc ion plating deposition F-ta-C layer processing, then carries out heat treatment, that is, preparation is completed.The present application is prepared by introducing titanium powder, forming solid solution between metal substrate and chromium, and forming a variety of component stable compounds on its surface, titanium is used as intermediate layer, provides support force, makes each layer element gradient distribution, improves the binding force between chromium element and glass matrix, improves the compactness and uniformity of metal substrate, improves the wear resistance of metal mold, reduces segregation phenomenon.

A concrete funnel elephant trunk device comprises a support and a conical hopper, the support is integrally a square frame body, the frame body comprises a seat plate and a platform plate which are arranged in parallel, supporting legs are arranged among the four corners of the seat plate and the four corners of the platform plate, the conical hopper is placed on the platform plate, and a cylindrical discharging pipe is arranged at the lower end of the conical hopper. A lower port of the discharging pipe is sealed through a bottom plate, connector pipes are arranged at the front end and the two sides of the discharging pipe in the radial direction, the outer ends of the connector pipes are connected with concrete articulated chutes, and the concrete articulated chutes are arranged downwards in an inclined mode; according to the articulated chute device, the plurality of joint pipes are arranged at the discharge port at the lower end of the conical hopper, the plurality of concrete articulated chutes can be simultaneously connected to the plurality of joint pipes, the concrete articulated chutes can cover a larger slope area at one time, and concrete can be synchronously conveyed to each concrete articulated chute through the conical hopper; the problems that a traditional chute structure is small in coverage area and needs to move frequently are effectively solved, the slope concrete construction efficiency is improved, and the construction cost is reduced.

This invention discloses a method for preparing a six-element master alloy of aluminum, titanium, tin, zirconium, molybdenum, and chromium, comprising the following steps: Step S1, thoroughly mixing an appropriate amount of potassium chlorate (a heating agent) with aluminum powder, titanium dioxide, tin dioxide, zirconium dioxide, molybdenum trioxide, chromium trioxide, and a slagging agent; Step S2, loading the uniformly mixed materials into a reaction vessel, performing a compaction treatment, and then igniting the mixture. The resulting molten alloy sinks, while slag used to protect the molten alloy floats to the surface. After cooling, the molten alloy yields an initial aluminum-titanium-tin-zirconium-molybdenum-chromium alloy block; Step S3, the alloy block is refined and crushed to obtain the aluminum-titanium-tin-zirconium-molybdenum-chromium master alloy. The method for preparing the six-element master alloy of aluminum, titanium, tin, zirconium, molybdenum, and chromium provided by this invention achieves a one-time preparation through a self-propagating reaction, resulting in a more uniform alloy composition. This effectively improves the alloying degree of TC17 and Ti1000, prevents component segregation and inclusions, and enhances the performance of titanium alloys such as TC17 and Ti1000. This invention also provides an aluminum-titanium-tin-zirconium-molybdenum-chromium master alloy prepared by the above method.

The invention relates to the technical field of steel and iron material processing, and provides high-toughness low-cost normalizing rolling bridge steel and a production method thereof.The high-toughness low-cost normalizing rolling bridge steel is composed of, by weight, 0.06%-0.15% of C, 1.15%-1.35% of Mn, 0.013%-0.040% of Nb, 0.1%-0.20% of Mo, 0.045%-0.09% of Zr, 0.002%-0.003% of Ca, smaller than or equal to 0.015% of Ti, 0.020%-0.045% of Alt, smaller than or equal to 0.020% of P, smaller than or equal to 0.005% of S, 0.1%-0.15% of Cr, 0.05%-0.1% of Ni, 0.05%-0.15% of Cu and the balance iron and inevitable impurities. Through the technical scheme, the problems of poor mechanical property and low-temperature toughness of bridge steel in related technologies are solved.