17465 results about "Smelting" patented technology

The invention discloses a distributed real-time monitoring and early warning system for a temperature field of a smelting furnace, and relates to the technical field of industrial process intelligent monitoring. The problems of accumulated measurement errors and non-stationary hotspot escape reconstruction hysteresis caused by static emissivity setting in an existing system are solved. Collecting multiband radiation intensity and voltage signals through time domain alignment of the multispectral sensor array and the thermocouple array; iterating emissivity parameters in real time by adopting a dynamic ash body spectrum ratio algorithm in combination with flue gas absorption characteristics; fusing non-contact and contact temperature measurement data based on weighted Kalman filtering and complementary filtering; constructing a space-time variable covariance function to carry out non-stationary Kriging interpolation; dynamically optimizing the local grid resolution by combining an adaptive grid module; the processing flow is accelerated through the parallel computing module; early warning is triggered based on abnormal probability judgment and is fed back to emissivity correction and grid optimization; according to the invention, the monitoring precision and real-time performance of the temperature field are obviously improved, and the risks of false alarm, missing alarm and equipment melting loss are effectively inhibited.

The invention discloses a 8.8-grade large-specification cold heading steel wire rod with excellent hardenability and a production method thereof, and belongs to the technical field of steel products. The steel wire rod is prepared from the following chemical components in percentage by mass: 0.35 percent to 0.39 percent of C, less than or equal to 0.10 percent of Si, 0.60 percent to 0.85 percent of Mn, 0.20 percent to 0.40 percent of Cr, 0.15 percent to 0.25 percent of Mo, 0.05 percent to 0.10 percent of Ni, 0.020 percent to 0.040 percent of Al, 0.0040 percent to 0.0080 percent of Ca, 0.0010 percent to 0.0030 percent of Ce, less than or equal to 0.0050 percent of N and the balance of Fe and inevitable impurities. The process route comprises the steps of molten iron pretreatment, converter smelting, LF refining, continuous casting, continuous rolling, billet cleaning, heating, rolling and controlled cooling. The produced # imgabs0 cold heading steel wire rod is good in cold heading performance, the hardness of the cross section of the wire rod is larger than 45 HRC after quenching, and the cold heading steel wire rod can be used for producing 8.8-grade high-strength bolts, nuts, screws and other hexagonal flange standard parts.

The invention relates to the technical field of metallurgical raw material batching control, and discloses a bottom blowing smelting furnace automatic batching intelligent control method and system based on deep learning, and the method comprises the steps: achieving intelligent batching through multi-source data fusion, physical constraint modeling and dynamic optimization control; edge calculation is adopted to realize data space-time alignment and purification, and physical and economic mixed features are constructed; modeling a reaction path based on a graph neural network, and embedding conservation law constraint to synchronously predict key process parameters; and finally, in combination with gradient sensitivity analysis and reinforcement learning, constructing a differentiable optimization framework to realize multi-target dynamic ratio decision and real-time compensation control, and forming a perception-decision-execution closed loop. The system comprises a global sensing and data purification module, an intelligent decision-making and optimization batching module and a high-precision execution and closed-loop control module. According to the invention, the batching strategy is adaptively adjusted, and optimal resource allocation and maximum economic benefit are realized.

The invention discloses super high-strength and high-toughness steel and a preparation method thereof. The super high-strength and high-toughness steel comprises the following components in percentage by mass: 0.18 to 0.35 percent of C, 0.05 to 0.12 percent of Si, 0.30 to 0.50 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.008 percent of S, 0.8 to 1.5 percent of Cr, 0.10 to 0.30 percent of Mo, 2.5 to 3.5 percent of Ni, 0.05 to 0.12 percent of V, 0.01 to 0.05 percent of RE and the balance of Fe. When the content of C is not higher than 0.25%, the alloy contains 0.0005-0.003% of B and the balance of Fe and other inevitable impurities; the preparation process comprises the steps of smelting, homogenization treatment and blank opening, intermediate annealing treatment, large-deformation warm rolling, subzero treatment and low-temperature tempering treatment. The medium-carbon martensite super-high-strength and high-toughness steel with a large enough metastable austenite phase region is obtained through component design, conventional equipment and a production process are utilized for tissue regulation and control, the size of a martensite block is refined to about 1 micron, and the comprehensive mechanical property of the medium-carbon martensite steel is remarkably improved. The material prepared by the invention has ultrahigh strength and high toughness, and is easy for industrial large-scale production and lower in cost.

The GPa-grade ultrahigh-strength anti-fatigue steel comprises the following chemical components in percentage by weight: 0.02 to 0.07 percent of C, 0.10 to 0.25 percent of Si, 1.75 to 2.50 percent of Mn, 0.022 to 0.026 percent of P, less than or equal to 0.008 percent of S, 0.03 to 0.04 percent of Nb, 0.09 to 0.15 percent of V, 0.045 to 0.055 percent of Ti, 0.50 to 0.80 percent of Mo, 2.00 to 2.40 percent of Cr, 8.0 to 10.0 percent of Ni, 8.0 to 12.0 percent of Co, 0.035 to 0.045 percent of Als, 0.013 to 0.014 percent of N, 0.58 to 0.62 percent of Cu, 0.03 to 0.05 percent of Sb, 0.03 to 0.05 percent of RE and 0.0008 to 0.001 percent of B. The method comprises the steps of smelting, continuous casting, rapid cooling, casting blank heating, rolling and heat treatment. The maximum thickness of the steel plate is 100mm, Rp0.2 is 1080-1120MPa, A is greater than or equal to 18%, and the fatigue life gt under the peak stress of 560MPa; the impact energy at-60 DEG C is greater than or equal to 150J, and the marine atmosphere corrosion resisting rate is 1t; and 0.10 mm / a. The strength of the steel is improved, the impact toughness of the steel plate at low temperature is improved, and the corrosion resistance and the fatigue resistance of the steel are improved.

The invention discloses a low-cost high-cerium neodymium iron boron diffusion magnet and a preparation method and application thereof, and relates to the technical field of rare earth permanent magnet materials. Comprising the steps that a neodymium iron boron alloy casting piece Ce30 with the Ce content being 10 wt% and a neodymium iron boron alloy casting piece Ce50 with the Ce content being 15 wt% are prepared through burdening and smelting, after the Ce30 and Ce50 neodymium iron boron alloy casting pieces are evenly mixed, hydrogen decrepitation, jet milling, oriented pressing, cold isostatic pressing and vacuum sintering are sequentially carried out, and a high-cerium sintered neodymium iron boron matrix is obtained; carrying out grain boundary diffusion on the high-cerium sintered neodymium-iron-boron matrix to obtain a high-cerium neodymium-iron-boron diffused magnet; the performance of the blank prepared through the method is close to the N40 mark, the performance of the magnetic sheet after diffusion reaches the 38MT mark, the magnetic performance is kept at the high level, the Ce content is high, efficient utilization of the high-abundance element cerium is achieved, the production cost of the rare earth permanent magnet material is greatly reduced, industrial batch production can be achieved, and balanced utilization of rare earth resources is promoted.

The invention relates to an annealing-free alloy cold heading steel wire rod for a 12.9-grade bolt and a production method of the annealing-free alloy cold heading steel wire rod. The production process comprises the steps of molten iron pre-removal of P / S, electric furnace or converter smelting, external refining, bloom continuous casting, rolling into an intermediate billet and steel billet finishing, intermediate billet heating, high-pressure water descaling, rough rolling, intermediate rolling, pre-finish rolling, finish rolling, spinning, coil collecting and cooling. The annealing-free alloy cold forging steel wire for the 12.9-grade bolt comprises the following components in percentage by mass: 0.30%-0.35% of C, 0.10%-0.30% of Si, 0.70%-1.20% of Mn, 1.0%-1.5% of Cr, 0.15%-0.30% of Mo, 0.015%-0.030% of Al, 0.0030%-0.0080% of N, 0.01%-0.04% of Nb, less than or equal to 0.30% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.012% of (As + Sb + Bi), less than or equal to 0.0010% of O and the balance of Fe and inevitable impurity elements, the niobium-nitrogen product (Nb * N) is greater than On the premise that main alloy components are not reduced, a fine grain structure can be obtained under a certain condition by adding grain refining elements, and the delayed phase change effect the same as that of a low-temperature finish rolling process is achieved by utilizing the delayed phase change characteristic of the fine grain structure.

The invention discloses a 500MPa-grade supercritical CO2 corrosion-resistant pipeline coil plate and a manufacturing method thereof, and the 500MPa-grade supercritical CO2 corrosion-resistant pipeline coil plate comprises the following chemical components: 0.05 to 0.10 percent of C, 0.6 to 0.9 percent of Si, 1.50 to 1.70 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, 0.10 to 0.30 percent of Cr, 0.35 to 0.45 percent of Mo, 0.03 to 0.05 percent of Nb, 0.01 to 0.03 percent of Ti, 0.02 to 0.05 percent of Al, 0.20 to 0.30 percent of Co, less than or equal to 0.008 percent of N, 1.2 to 4.3 percent of Mo / Cr, 0.75 to 0.92 percent of Mo + Cr + Co, 2.8 to 3.9 percent of Si / Co and the balance of Fe and inevitable elements. The manufacturing method comprises the steps of smelting, slab continuous casting, continuous casting slab heating, rolling, cooling and coiling. In the transverse direction of the rolled plate, Rt0.5 is larger than or equal to 540 MPa, Rm is larger than or equal to 640 MPa, Rt0.5 / Rm is smaller than or equal to 0.87, A50 mm is larger than or equal to 36%,-40 DEG C impact energy KV8 is larger than or equal to 220 J, and-20 DEG C drop weight DWTT is larger than or equal to 95%; in the longitudinal direction, Rt0.5 is larger than or equal to 520 MPa, Rm is larger than or equal to 630 MPa, Rt0.5 / Rm is smaller than or equal to 0.86, and A50mm is larger than or equal to 38%; the average corrosion rate in a 14.5 MPa supercritical CO2 environment is 1t; and 0.05 mm / a. The low-carbon medium-manganese molybdenum-chromium-cobalt-containing alloy design is adopted, the low-temperature toughness of a weld joint is guaranteed, the CO2 corrosion resistance and the oxidation resistance are improved, and higher safety is achieved in pipeline engineering.

The invention discloses steel for extremely cold marine environment engineering and a production method of the steel. The steel comprises the following chemical components: 0.02 to 0.07 percent of C, 0.10 to 0.25 percent of Si, 1.75 to 2.50 percent of Mn, 0.022 to 0.026 percent of P, less than or equal to 0.008 percent of S, 0.025 to 0.030 percent of Nb, 0.02 to 0.03 percent of V, 0.02 to 0.03 percent of Ti, 0.15 to 0.35 percent of Cr, 0.15 to 0.35 percent of Ni, 0.02 to 0.05 percent of Co, 0.035 to 0.045 percent of Als, 0.010 to 0.012 percent of N, 0.15 to 0.22 percent of Cu, 0.03 to 0.05 percent of Sn, 0.03 to 0.05 percent of Sb and 0.03 to 0.05 percent of RE. Through smelting, slab continuous casting, casting blank heating, rolling and cooling, the Rp0.2 of the steel is 420-480 MPa, A is larger than or equal to 26%, the impact energy at the temperature of-80 DEG C is larger than or equal to 210 J, the corrosion resistance rate is smaller than 0.080 mm / a, the fatigue life under the peak stress load of 200 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 45%. The steel plate provided by the invention has relatively high strength and excellent low-temperature toughness, and also has relatively good corrosion resistance and fatigue resistance.

The invention discloses a converter steelmaking self-learning method and system based on data driving, and belongs to the technical field of metallurgical intelligent converter automatic control. The system comprises an information acquisition module, a sample labeling module, a sample management library, a data preprocessing module, an online decision module, a data perspective module and an optimization module, wherein the information acquisition module acquires raw and auxiliary material data, process control parameters and equipment state data; the sample labeling module is used for classifying and labeling the obtained data; the sample management library stores data; the data preprocessing module is used for preprocessing the collected data; the online decision-making module is used for judging and adjusting the smelting state; the data perspective module is used for grading and quantifying the smelting result; and the optimization module carries out optimal mode smelting mode, index correlation factor analysis and model parameter self-optimization through historical data. According to the invention, intelligent smelting of the converter is realized.

The high-steel-grade low-cost hot-rolled coil plate comprises the following chemical components: 0.040 to 0.065 percent of C, 0.20 to 0.35 percent of Si, 1.48 to 1.75 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of S, 0.012 to 0.025 percent of Ti, 0.035 to 0.055 percent of Nb, 0.005 to 0.008 percent of RE, 0.15 to 0.20 percent of Cr, 0.0005 to 0.0020 percent of B, 0.002 to 0.004 percent of Mg, 0.025 to 0.050 percent of Als, less than or equal to 0.003 percent of Ca, less than or equal to 0.008 percent of N and the balance of Fe and inevitable impurities. The technological process comprises the steps of smelting, slab continuous casting, slab heating, rolling, cooling and coiling. Rt0.5 of the steel is 580-660 MPa, Rm is 650-750 MPa, A50 mm is larger than or equal to 28%, Rt0.5 / Rm is smaller than or equal to 0.90, the impact energy mean value Akv at the temperature of-40 DEG C is larger than or equal to 200 J, the drop weight DWTT mean value at the temperature of-20 DEG C is larger than or equal to 90%, the hardness value HV10 is smaller than or equal to 220, and the cold bending performance is qualified. The product provided by the invention has high strength and toughness and good welding performance, so that the product is more suitable for various complex and extreme service environments, and has higher safety in pipeline engineering.

The invention belongs to but is not limited to the technical field of aluminum alloy preparation, and discloses a high-plasticity aluminum alloy prepared from secondary aluminum and a preparation method, high-quality secondary aluminum waste is selected, and obvious impurities are removed; carrying out chemical or mechanical cleaning on the secondary aluminum, and sorting; the pretreated secondary aluminum waste is added into a smelting furnace to be smelted; a purifying agent is added for melt purification; the melt is further purified through inert gas stirring and standing; adding a proper amount of alloy elements into the melt; under the protection of inert gas, uniformly stirring the melt; casting the melt into a cast ingot by adopting a semi-continuous casting or continuous casting process; controlling the cooling speed; carrying out homogenizing heat treatment on the cast ingot to eliminate composition segregation in the cast ingot; and extruding and rolling to obtain the high-plasticity aluminum alloy material. According to the method, the purity of the aluminum alloy is improved, the performance uniformity is enhanced, and the aluminum alloy material with high plasticity and excellent mechanical performance is obtained and is suitable for industrial application with high requirements.

The invention relates to the field of steelmaking. More specifically, the invention relates to a process for controlling nitrogen increase in electric furnace smelting. The invention provides a method for producing low-nitrogen steel from electric furnace full waste steel. The method specifically comprises the steps that waste steel is loaded into an electric furnace, CO2 gas is injected into the electric furnace before and after loading, air is exhausted, and micro-positive pressure in the electric furnace is kept. The method comprises the following steps: after an electric furnace forms a molten pool, injecting limestone powder at the top of the furnace with the injection amount of 60-80kg / t and the injection carrier gas of CO2 gas, after the electric furnace forms the molten pool, injecting oxygen and carbon powder by adopting a carbon-oxygen lance to make foamed slag, injecting CO2 gas into the molten pool to decarburize, produce two times of CO gas and intensify denitrification, and during tapping of the electric furnace, protecting steel flow from ending with air by adopting CO2 gas, and feeding into the next process for smelting after tapping of the electric furnace. Application proves that when the method is used for smelting low-nitrogen steel, nitrogen in the electric furnace can be controlled not to be increased, N is smaller than or equal to 0.003% after tapping of the electric furnace, the smelting rate of the low-nitrogen steel grade is increased, and low-carbon emission production of special varieties is achieved.

The invention relates to a production method of a wire rod for an alloy welding wire, and belongs to the technical field of steel manufacturing. Mn, Cr and Ni alloying and V and Ti microalloy strengthening are adopted, and a certain amount of B is added, so that the requirement of a 60-kilogram-level alloy welding wire is met. The process route is designed as follows: molten iron pretreatment, converter smelting, LF furnace external refining, 150mm / 180mm square billet continuous casting, heating furnace heating, rolling, roller way slow cooling and heat preservation vestibule heat preservation. Molten steel with stable components, good castability and gas content meeting the requirement is obtained through the technologies of molten iron pretreatment, converter smelting, LF furnace external refining and the like, after the molten steel is poured into a continuous casting blank, stack cooling or hot delivery and hot charging are conducted for 24 hours, and the technologies of high-temperature rolling, high-temperature spinning, roller way slow cooling and heat preservation vestibule are adopted for high-speed wire rolling. By adopting the process of the scheme, the wire rod can be prevented from generating abnormal structures such as martensite and bainite which influence drawing, and the wire rod for the high-strength alloy welding wire with the specification of phi 5.5 mm, which has stable components and can be drawn into filaments with the specification of phi 1.2 mm without annealing, is obtained.

The invention relates to the technical field of cold crucible smelting furnaces, in particular to a magnetic suspension smelting device of a multi-station water-cooling crucible, which comprises a furnace chamber, an induction coil and a crucible, the top of the furnace chamber is provided with a furnace cover, the side part of the furnace chamber is provided with a furnace door and a vacuum system for vacuumizing the interior of the furnace chamber, and the induction coil and the crucible are arranged in the furnace chamber. The plurality of crucibles are arranged on a crucible support together, a driving device is arranged at the bottom of the crucible support, and the driving device can drive the crucible support to ascend, descend and rotate, so that the crucibles can enter and exit from the center of the induction coil in sequence. After the interior of the furnace chamber is vacuumized, multiple smelting operations can be carried out in the atmosphere of argon filling after a single vacuumizing state, the operation steps are simple and convenient, the middle actions such as multiple vacuumizing and vacuum breaking are omitted, in addition, only one vacuumizing device and one motor driving device are adopted in the whole device, continuous and automatic smelting can be achieved, and the production efficiency is improved. The production efficiency is greatly improved; and the cost is saved.

The invention belongs to the technical field of metallurgical continuous casting, and particularly relates to a method for removing tundish inclusions based on cooperation of an external electric field and physics. The invention discloses a method for removing tundish inclusions based on cooperation of an external electric field and physics, and mainly aims at solving the problems that as the inclusions in tundish molten steel enter a subsequent continuous casting link, a submersed nozzle is clogged and blocked, and the quality of a casting blank is deteriorated. The key point is that an external electric field and physics synergistic effect is used; a bottom blowing device is arranged to provide power for floating of inclusions; an original baffle weir structure of the tundish is improved, and the probability of catching inclusions is increased; and an external electric field is cooperatively used, so that the inclusions are promoted to float towards the tundish covering agent and be attached to the blocking weir. By means of the method for cooperatively removing the tundish inclusions based on the external electric field and physics, the tundish molten steel inclusions can be obviously removed, the service performance of a subsequent water gap is optimized, the casting blank quality is improved, and the improvement of the high-quality steel smelting level in China is assisted.

The invention discloses a low-carbon magnesia-carbon refractory material for clean steel smelting and a preparation method thereof, and relates to the technical field of magnesia-carbon refractory materials. The low-carbon magnesia-carbon refractory material comprises the following components: 40-50 wt% of fused magnesite with the particle size of 3-5 mm, 20-30 wt% of fused magnesite with the particle size of 1-3 mm, 10-20 wt% of fused magnesite with the particle size of less than or equal to 74 [mu] m, 8-12 wt% of silicon powder, 1-3 wt% of alumina powder and 3-5 wt% of crystalline flake graphite. 2-4 wt% of a composite additive and 4-6 wt% of phenolic resin are added; the composite additive comprises andalusite and mullite. The material has excellent mechanical properties, thermal shock resistance, oxidation resistance and erosion resistance; the preparation method has the characteristics of low cost and simple process, and the prepared low-carbon magnesia carbon refractory material has excellent oxidation resistance, thermal shock resistance and slag resistance by exerting the phase volume expansion effect and intergranular phase enhancement effect of the multiphase ceramic; the used graphite is low in content, graphite consumption and molten steel recarburization risk can be reduced, and the method is suitable for smelting clean steel.

The invention discloses a low-cost 450MPa-grade hot-rolled coil plate for a welded pipe and a manufacturing method thereof, and the low-cost 450MPa-grade hot-rolled coil plate comprises the following chemical components: 0.08 to 0.10 percent of C, 0.2 to 0.4 percent of Si, 1.4 to 1.6 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of S, 0.01 to 0.03 percent of Ti, 0.020 to 0.040 percent of Nb, 0.003 to 0.005 percent of RE, 0.15 to 0.25 percent of Cr, 0.002 to 0.004 percent of Mg, 0.01 to 0.04 percent of Als, less than or equal to 0.003 percent of Ca, less than or equal to 0.008 percent of N, less than or equal to 0.15 percent of (Nb + Ti + C + N) and the balance of Fe and inevitable elements. The manufacturing method comprises the steps of smelting, slab continuous casting, casting blank heating, rolling, cooling and coiling. The Rt < 0.5 > of the steel is 450-550 MPa, the Rm is 550-650 MPa, the A50mm is larger than or equal to 30%, the ratio of the Rt < 0.5 > to the Rm is smaller than or equal to 0.90, and the impact energy average value Akv at the temperature of-30 DEG C is larger than or equal to 200 J.

The invention provides a manganese-silicon alloy and a production method thereof, and the production method comprises the following steps: respectively crushing a manganese-containing material, silica and coke in proportion, mixing with a dephosphorizing agent, adding a binder and a proper amount of water to prepare a premix, pressing the premix into smelted pellets, and drying; the dried smelting pellets are put into a closed electric furnace to be smelted, and alloy melt is obtained; transferring the alloy melt into a steel ladle, and blowing magnesium powder for desulfurization; the desulfurized alloy melt is subjected to slagging-off, and manganese-silicon alloy molten iron is obtained; and the manganese-silicon alloy molten iron is poured into a mold for ingot casting, and a manganese-silicon alloy finished product is obtained after cooling. According to the method, the raw materials such as the manganese material, the silica, the coke and the dephosphorizing agent are crushed respectively and then mixed, briquetted and smelted, so that the dephosphorizing and desulfurizing effects can be improved, and sulfur in the alloy can be further removed by spraying magnesium powder outside the furnace for desulfurization, so that the quality of the manganese-silicon alloy is improved.

The invention discloses a magnesium-based cobalt precipitation agent and a preparation method and application thereof, and relates to the technical field of composite materials. The method comprises the following steps: performing calcination dissociation, enhanced leaching, carbonization separation, efficient pyrolysis, solid-liquid separation, drying and calcination on first magnesium ore to obtain active magnesium oxide; the second magnesium ore is subjected to calcination dissociation, hydration impurity removal, solid-liquid separation and low-temperature calcination, and then high-purity magnesium oxide is obtained; performing series-parallel modification on active magnesium oxide and high-purity magnesium oxide to obtain a magnesium-based cobalt precipitation agent; the mass ratio of the active magnesium oxide to the high-purity magnesium oxide is 1: (2-10), the modifier is quaternary ammonium salt organic powder, and the addition amount of the modifier is 0.02-1% of the total mass of the magnesium oxide. The magnesium-based cobalt precipitation agent prepared through the method is high in activity, has the advantages of being high in efficiency, low in price, low in unit consumption, environmentally friendly and the like in the aspect of nickel and cobalt precipitation through copper-cobalt ore and laterite-nickel ore wet smelting, and can greatly reduce the material cost in the nickel cobalt hydroxide production process.

According to the mullite castable preparation method based on comprehensive utilization of the secondary aluminum ash nonferrous smelting slag, components are regulated and controlled by controlling the molar ratio of Al2O3 to SiO2, so that porous light mullite stably falls into a mullite phase region, and generation of excessive corundum phases is avoided. PMMA microspheres, corn flour, carbonized rice husks and SiO2 coated calcium carbonate composite pore-forming agent systems are adopted, and a layered slurry formula, gradient slip casting and segmented sintering processes are combined, so that the porosity and strength distribution are accurately regulated and controlled, and low-temperature sintering and amorphous phase change control are realized. By optimizing the grading of the porous light mullite aggregate and adding the homologous fine powder, the bonding strength and compressive strength of the castable are improved. And finally, the surface of the castable is coated with a compact mullite coating, so that the porosity is reduced, and the erosion resistance, corrosion resistance and stripping resistance are remarkably improved. The obtained castable has the advantages of light weight, high temperature resistance, high strength, low cost and excellent thermal stability and erosion resistance.

The utility model relates to the technical field of metal material welding, in particular to a black metal smelting rolled product welding device which comprises a base, two metal pipes horizontally placed above the base and with the two ends aligned, and a welding head arranged at the upper end of the base. The first motor is driven to drive the second gear to rotate on the rack, so that the welding positions of the metal pipes abut against each other, the metal pipes with different length specifications and outer diameter specifications are extruded, fixed and welded, it is guaranteed that the welding positions of the metal pipes are kept in a stable abutting state all the time when the metal pipes are welded, and the welding quality and efficiency are improved; and meanwhile, a second electric telescopic rod drives a first electric telescopic rod to stretch out and draw back to the welding position of the metal pipe, and then the first electric telescopic rod drives a welding head to abut against the metal pipe, so that the welding head conducts comprehensive welding work on all the welding faces of the metal pipe.

The invention provides a production method of 440MPa-grade normalized high-strength structural steel for a ship body, and belongs to the field of ship body structural steel manufacturing, the production process route of the steel comprises smelting, die casting, rolling, rapid cooling, finishing, normalizing and tempering, the thickness of a produced steel plate is 8-20mm, and the steel comprises the following chemical components in percentage by mass: 0.06-0.10% of C; si: less than or equal to 0.40%; mn is equal to 0.90%-1.20%; less than or equal to 0.015% of P; s: < = 0.005%; the ratio of Ni to Cr is (0.90%-1.30%): (0.50%-0.65%); v is equal to 0.030 percent to 0.050 percent; cu is equal to 0.15%-0.35%; n is less than or equal to 0.0040%, and the balance is Fe and inevitable impurities. The microstructure of the steel is a bainite tempered structure and ferrite, and the average grain size of the ferrite is smaller than or equal to 10 micrometers. The yield strength of the steel is larger than or equal to 440 MPa, the tensile strength is larger than or equal to 600 MPa, the yield ratio is smaller than or equal to 0.75, the impact absorbing energy at the temperature of 60 DEG C below zero is larger than or equal to 200 J, the ductile-brittle transition temperature is not higher than 80 DEG C below zero, and a product has good corrosion resistance.

The invention discloses copper-containing maraging ultrahigh-strength steel and a preparation method thereof, and belongs to the field of steel and iron materials. The copper-containing maraging ultrahigh-strength steel is prepared from the following chemical components in percentage by mass: 14.5 to 16.0 percent of Co, 17.0 to 18.0 percent of Ni, 6.0 to 8.0 percent of Mo, 1.0 to 1.5 percent of Ti, 0.5 to 1.0 percent of Cu, 0.5 to 1.0 percent of Al and the balance of Fe and inevitable impurities. The preparation method comprises the steps of vacuum smelting, high-temperature homogenization, forging cogging, thermal deformation and thermal treatment. According to the copper-containing maraging ultrahigh-strength steel prepared through the preparation method, under the condition that the grain size is larger than or equal to 8.0, the tensile strength of the material reaches 2800 MPa or above, meanwhile, the elongation of 7% or above is kept, and the application requirements of different fields for the ultrahigh-strength steel with the tensile strength of 2800 MPa or above can be met.

A non-oriented silicon steel for a high-speed motor and a manufacturing method therefor. The chemical components of the non-oriented silicon steel for a high-speed motor are as defined in the description, wherein the thickness of a finished product is 0.20-0.30 mm, and the grain size of the finished product is 80-100 μm. The manufacturing method for the non-oriented silicon steel for a high-speed motor comprises: performing smelting and casting into a continuous casting billet, and performing cooling, heating, hot rolling, normalizing, pickling, cold rolling, annealing and coating treatment on the continuous casting billet.

The invention discloses a powder spraying refining process for production of a rare earth oxide dispersion strengthened alloy, and belongs to the technical field of alloy smelting. During converter tapping, iron silicon aluminum 4.5-8.5 kg / t is adopted for strong deoxidation; after tapping is finished, 0.2-0.4 kg / t of rare earth aluminum alloy is added to the slag surface of the steel ladle for slag surface deoxidation; molten steel is conveyed to a powder spraying station, the temperature of the molten steel is regulated and controlled to be 1570-1610 DEG C, inert carrier gas is used for spraying rare earth powder into the molten steel at a high speed, the carrier gas conveying working pressure of steel ladle powder spraying is 3.0-4.0 bar, the carrier gas flow is 40-60 m < 3 > / h, the steel ladle powder spraying speed is 10-50 kg / min, and the dosage of the powder spraying agent is 1.0-50.0 kg / t. After the powder spraying refining process is adopted, the solid solution oxygen content in the steel can be increased to 100 ppm or above, and the solid solution content of RE elements can be increased to 300 ppm or above, so that nano rare earth oxide dispersion strengthened alloy is formed.

The invention belongs to the technical field of tungsten smelting, and particularly discloses a method for recycling tungsten from tungsten smelting soda boiling slag through reselection, tungsten in the slag is recycled through a physical mineral separation method, a large number of acid-base reagents are not introduced, acid-base wastewater is not generated, and high-energy-consumption roasting or high-temperature acid-base leaching is not needed. The process is simple, large-scale treatment can be achieved, reagent consumption is low, energy consumption is low, closed-loop circulation of mineral separation water can be achieved, no wastewater is discharged, the process is environmentally friendly and free of pollution risks, meanwhile, indexes of the soda boiling residues subjected to innocent treatment can reach industrial solid waste, hazardous waste is converted into common solid waste, and the economic benefit is high. The environment-friendly treatment cost is low.

The invention discloses a stamping device for ferrous metal smelting and a stamping method of the stamping device, and relates to the technical field of stamping machining equipment.The stamping device comprises a bottom plate and side plates symmetrically fixed to the two sides of the top of the bottom plate, the top ends of the side plates are fixedly connected with a top plate, and the stamping device further comprises an adjusting assembly arranged in the middle of the bottom of the top plate; the adjusting assembly comprises a pressurizing air cylinder. The clamping assemblies are symmetrically arranged on the inner sides of the side plates, and each clamping assembly comprises a fixing sleeve and a connecting rod; one end of the connecting rod is fixedly connected with the fixing sleeve, the other end of the connecting rod is fixedly connected with a vertical rack, the middle of the inner side of the side plate is fixedly connected with a limiting sleeve, the vertical rack is slidably connected with the limiting sleeve, and the lower portion of the inner side of the side plate is rotatably connected with a lead screw. The problems that the extrusion force of the upper pressing plate is prone to being uneven in the stamping process, so that when the stamping speed is too high, stamped black metal is uneven in depth, deep or shallow, and the stamping efficiency and the qualified rate of products are affected are solved.

The invention relates to a preparation method of a low-cost high-quality titanium ingot. The method comprises the following steps that raw materials including 20%-30% of new materials (titanium sponge, aluminum-vanadium intermediate alloy, aluminum shots and aluminum plates) and 70%-80% of recycled materials (TC4 blocky recycled materials and TC4 scrap-shaped recycled materials) are prepared, and the recycled materials are treated; mixing the materials and pressing a titanium alloy lump; material distribution is conducted, specifically, the titanium alloy lumps, the recycled materials and the aluminum plates are evenly stacked in an electron beam cold bed furnace (EB furnace) for drying treatment; eB is smelted to obtain an EB cast ingot; performing end flattening treatment on the EB cast ingot; and the EB cast ingot serves as a consumable electrode and is subjected to secondary smelting in a vacuum consumable electric arc furnace (VAR furnace), and finally the finished TC4 titanium alloy cast ingot with uniform cast ingot components is obtained. The method effectively utilizes the recycled materials, reduces the production cost, improves the ingot casting quality, and is suitable for preparing high-performance titanium alloy materials for aviation, aerospace and the like.

The invention discloses a blast furnace cooling wall damage probability prediction method, which relates to the field of industrial equipment maintenance, and comprises the following steps: arranging a temperature sensor array, a vibration sensor and an acoustic emission sensor, and collecting temperature gradient data, mechanical vibration frequency and high-frequency stress wave signals in real time; calculating the slag crust thickness of the hot surface of the cooling wall based on an unsteady state heat transfer equation, introducing an in-furnace gas flow parameter correction model, and generating a dynamic slag crust thickness distribution cloud picture; establishing temperature and vibration reference threshold values under different working conditions according to historical operation data of the cooling wall, and detecting temperature over-limit accumulated duration and a vibration energy spectrum abnormal frequency band in real time; taking the temperature gradient range, the slag skin thickness variation coefficient and the vibration dominant frequency offset as input characteristics, training a multi-dimensional coupled damage probability prediction model through a random forest algorithm, and outputting a recent dynamic damage probability value of each section of cooling wall; and dividing risk grades according to the damage probability value, dynamically adjusting a threshold interval in combination with the real-time smelting strength of the blast furnace, and generating a differentiated maintenance suggestion set.