2251 results about "Alloy element" patented technology

The invention relates to the technical field of tin-containing copper alloy manufacturing, in particular to a method, system and equipment for detecting the oxygen content of copper alloy melts.The method comprises the steps that resistivity data of the copper alloy melts.The temperature data of the copper alloy melts.The resistivity data of the copper alloy melts.The temperature data of the copper alloy melts.The resistivity data of the copper alloy meltsare acquired in real time; the resistivity data are corrected based on the temperature data, and standardized resistivity irrelevant to the temperature is obtained; a correlation model of the resistivity and the oxygen content is established according to the linear influence relation of oxygen impurities in the copper alloy melt on the resistivity, a real-time oxygen content value is output based on the standardized resistivity, and an oxygen content fluctuation trend is generated; and according to the real-time oxygen content value and the oxygen content fluctuation trend, the oxygen content tolerance threshold value of the copper alloy melt is dynamically adjusted based on the oxygen sensitivity requirements of different alloying stages. By means of the method, the problems that in a traditional oxygen content detection method, due to the fact that temperature distribution is uneven, alloy element interaction and solidification behaviors are not systematically modeled, the detection precision is low, and microstructure control fails are effectively solved.

The invention relates to a 1400 MPa-grade nickel-based alloy for a second-generation high-temperature superconducting base band and a preparation method of the 1400 MPa-grade nickel-based alloy, and belongs to the technical field of materials. The nickel-based alloy comprises the following chemical components in percentage by weight: 15.0 to 17.0 percent of Cr, 13.0 to 15.0 percent of Mo, 5.5 to 9.0 percent of W, 5.0 to 7.0 percent of Fe, 0.4 to 0.6 percent of Mn, 0.01 to 0.05 percent of Si, 0.1 to 0.2 percent of V, 0.0 to 2.5 percent of Co, 0.1 to 0.2 percent of Al, 0.001 to 0.01 percent of B and Clt, 0.005%, Plt; 0.005%, Slt; 0.002%, Olt; 0.002%, Nlt; 0.002%, and the balance being nickel. On the basis of the Ni-Cr-Mo alloy, the composition design thought of increasing W and reducing Mo is adopted, the optimized hot working and heat treatment process is matched, and finally the strength of a base body is improved through cold deformation; the content of C is controlled, precipitation of carbides is controlled, and alloy elements are ensured to be completely dissolved into a matrix during homogenization treatment; and a pure smelting process is adopted, so that the oxygen content in the alloy is reduced, the inclusion content is controlled, and high purity is ensured.

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 discloses a method for preparing an aluminum foil of a 1100 aluminum alloy new energy battery from electrolytic aluminum liquid. The aluminum foil comprises the following alloy elements in percentage by mass: 0.55 to 0.60 percent of Fe, 0.10 to 0.13 percent of Si, 0.20 to 0.25 percent of Cu, 0.010 to 0.020 percent of Ti, less than or equal to 0.01 percent of Mn, 0.015 to 0.025 percent of Zn, less than or equal to 0.01 percent of Mg and more than or equal to 99.00 percent of Al. And the high-strength aluminum foil is obtained through the processes of annealing, cold rolling, annealing and the like. The method has the beneficial effects that in large-scale industrial production, the product quality is stable, and the plate shape, the thickness difference, the surface quality and the mechanical property meet user requirements; the tensile strength of the prepared aluminum foil is 205-220 Mpa, the ductility is 4.5-6.0%, the tensile strength of the produced finished aluminum foil with the diameter of 0.012-0.015 microns is larger than or equal to 300 Mpa, and the ductility is larger than or equal to 3.0%.

The present disclosure relates to a composite-strengthened heat-resistant and wear-resistant aluminum alloy and a preparation method thereof, and belongs to the field of preparation of high-performance metal materials. In the composite-strengthened heat-resistant and wear-resistant aluminum alloy of the present disclosure, an Al—Si—Cu—Mg alloy is adopted as a matrix, and microalloying elements for improving the heat resistance and a heat-resistant high-entropy alloy (HEA) for improving the wear resistance are added to allow composite strengthening. The preparation method mainly includes the following steps sequentially: smelting and alloying, blowing and refining, blow-compounding, die-casting molding, solution treatment, water quenching, and cryogenic and aging composite heat treatment.

The invention relates to an aluminum-based composite material, in particular to a preparation method of an in-situ micro-nano Al2O3 particle reinforced aluminum-based composite material. The preparation method comprises the following steps: carrying out ball-milling pre-dispersion on silica powder, calcined kaolin and aluminum powder according to a specified ratio, stirring an Al-Si alloy melt at a semi-solid temperature, adding ball-milling mixed powder, heating to a temperature above an Al-Si alloy liquidus, dispersing reactant powder by using a blade-tray integrated stirring device, heating, carrying out heat preservation, carrying out heat preservation, and carrying out vacuum drying to obtain the aluminum-silicon alloy. And reacting to generate in-situ micro-nano Al2O3 particles, cooling, supplementing alloy elements, refining, and pouring to obtain the in-situ micro-nano Al2O3 particle reinforced composite material. According to the blade-tray integrated stirring device, mechanical stirring and the rolling and impacting effects of the ceramic balls are combined, the problem of one-time dispersion of micro-nano reactant powder is effectively solved, meanwhile, passivation of edges and corners of micron particles is achieved, and the comprehensive performance of in-situ particle reinforced aluminum matrix composites is improved.

Alloy elements are reasonably matched, N and nitrides are added to form elements such as tungsten W, vanadium V, niobium Nb, cobalt Co, rare earth RE and the like for microalloying smelting, a forged and rolled material finished product is subjected to proper heat treatment, and the stainless steel subjected to heat treatment has good heat treatment performance through metallographic observation. According to the stainless steel, nanoscale carbides are separated out in a solid solution state, and fine particles mainly containing nitrides are dispersed and separated out in crystals in a thermodynamic state, so that the material is strengthened and does not diffuse to a crystal boundary, and the room-temperature mechanical property and the high-temperature mechanical property of the material are greatly improved; and when the stainless steel material produced by the method is used for manufacturing related products, the thickness of the stainless steel material can be reduced, and the overall input of the stainless steel material is greatly reduced, so that the large-scale application of noble metal strategic resource nickel is saved, and the aims of saving resources, energy and investment are fulfilled.

A high-performance near-pure zinc alloy, a preparation method therefor and a use thereof, relating to the technical field of zinc alloys. The alloy component is that the content of Zn is greater than or equal to 99.5%, and the remaining trace alloy elements include at least two of the following 14 elements: Mg, Mn, Li, Cu, Ag, Ca, Sr, Fe, Zr, Ti, Al, C, Ga, and Si. The alloy has the yield strength ≥ 250 MPa, the tensile strength ≥ 320 MPa, the elongation ≥ 25%, the mechanical property change during one year of room-temperature storage ≤ 5%, the maximum bending force ≥ 2 kN, the stress corrosion sensitivity factor ≤ 15%, the size of corrosion pits after 60 days of immersion ≤ 15 μm, and the standard deviation of the size of corrosion pits ≤ 3 μm. The alloy is suitable for the preparation of biodegradable stents, bone implant devices, medical staplers or anastomotic nails for intestines, blood vessels or nerves, vascular clamps, guided bone or tissue regeneration membranes, heart valve protheses, dura mater repair membranes, soluble bridge plugs and fracturing balls for oil drilling, zinc alloy die castings, electroplated zinc materials, building zinc materials, battery-grade zinc, printing-grade zinc, and zinc-based brazing alloys.

A medium-strength and high-conductivity aluminum alloy sheet and its preparation method, which relate to an aluminum alloy sheet and its preparation method. The purpose of the present invention is to solve the technical problem that when other alloying elements are added to existing aluminum alloys to improve the mechanical properties of the alloy, its electrical conductivity will be sacrificed. The medium-strength and high-conductivity aluminum alloy sheet includes the following components by weight percentage: Mg: 0.45-0.53%, Si: 0.4-0.46%, Cu: 0.1-0.5%, Fe≤0.16%, Zn≤0.01%, Mn≤0.03%, Cr≤0.02%, and the balance is impurities and Al. Method: First, prepare an aluminum alloy ingot; second, perform heat treatment; third, perform rolling; fourth, perform solution aging treatment. The electrical conductivity of the medium-strength and high-conductivity aluminum alloy sheet prepared by the present invention is above 53% IACS, while the hardness is higher than 75 HV and the tensile strength is higher than 187 MPa. The present invention can obtain a medium-strength and high-conductivity aluminum alloy sheet.

The invention provides a continuous casting method based on digital twinning. The continuous casting method comprises the steps that a material performance database of various metal materials under different alloy element components is established; a computer simulation model is established according to different ingot casting information, casting information, cold area information of continuous casting equipment and environment information, calculation is conducted, and post-processing results are sorted; collecting production test data in the continuous casting test; adopting a machine learning method, taking the obtained result data as a training and verification data set, and training a continuous casting digital twin machine learning model; automatic calculation and real-time adjustment of continuous casting process parameters are achieved through the digital twinborn model obtained after machine learning, and in the machining process, ingot casting information is collected and automatically calculated to obtain the internal structure, stress and temperature information of an ingot casting. According to the method, the required process can be rapidly calculated, linkage adjustment of other processes is achieved by adjusting a single process, the internal structure of the cast ingot can be rapidly calculated, and digital twinning is achieved.

The invention provides low-cost 1500MPa-grade hot-rolled high-strength steel and a preparation method, and relates to the technical field of hot-rolled high-strength steel. The thickness of the low-cost 1500MPa-grade hot-rolled high-strength steel is 4-8mm, and the low-cost 1500MPa-grade hot-rolled high-strength steel comprises the following chemical components in percentage by mass: 0.20-0.24% of C, 2.4-2.8% of Mn, 1.4-1.8% of Al, 0.3-0.4% of Si, less than or equal to 0.01% of P, less than or equal to 0.01% of S and the balance of Fe and inevitable impurity elements. The preparation method comprises the steps of raw material weighing, continuous casting, heat treatment, hot rolling and critical annealing. According to the invention, by creatively selecting alloy elements and adjusting the content, combining hot rolling and critical annealing treatment and controlling the air cooling rate, the comprehensive properties such as strength, plasticity and impact resistance of the steel plate are synergistically improved; the method is high in resource utilization rate, low in production cost, short in process, easy to operate, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention discloses a production method of 700MPa-grade high-strength weathering steel. The production method comprises the following steps: smelting and continuous casting production process flow: molten iron pretreatment, converter treatment, LF (ladle furnace) refining and machine casting; the components of the molten steel for the casting machine in percentage by mass are limited; according to the hot rolling production technological process, the casting blank tapping temperature is 1230 + / -20 DEG C, the finish rolling temperature of finish rolling is 890 + / -10 DEG C, the cooling speed is 10-20 DEG C / S, and the thickness of a hot rolled steel strip is 2.5-3.5 mm; laminar cooling equipment is adopted for cooling, a pre-dispersion cooling mode is adopted, and the coiling temperature is 640 + / -10 DEG C. A conventional C, S, i and Mn component system design is adopted, the content of corrosion-resistant alloy elements is properly reduced by adding corrosion-resistant elements Cu, Cr and Ni, the production cost is reduced, and meanwhile good performance is achieved.

The invention discloses an isomeric low-alloy high-strength steel structure electric arc additive manufacturing process, and relates to the technical field of electric arc additive manufacturing, the isomeric low-alloy high-strength steel structure electric arc additive manufacturing process comprises the following steps: carrying out heat treatment and tensile test on a low-alloy high-strength steel wire to obtain test data, and establishing a process parameter-performance prediction model according to the test data; obtaining a performance demand of a target structural member, and drawing up a process parameter by using a process parameter-performance prediction model according to the performance demand; an electric arc additive manufacturing system is used for conducting electric arc additive manufacturing on the low-alloy high-strength steel wire, and a low-alloy high-strength steel structural part is obtained; acquiring temperature information of the low-alloy high-strength steel structural member by using an infrared thermal imager, and adjusting the process parameters in real time according to the temperature information to obtain a target structural member; gradient distribution of precipitation strengthening phases is achieved, isomerism of alloy element in-situ strengthening low-alloy high-strength steel materials is achieved, and the diversified requirements of target structural parts for different strengths and plasticity are met.

The invention discloses an ultrahigh-strength 13-micron battery aluminum foil and a preparation method thereof, and belongs to the technical field of battery aluminum foils. The battery aluminum foil comprises the following alloy elements in percentage by mass: 0.23 to 0.27 percent of Si, 0.44 to 0.50 percent of Fe, 0.185 to 0.205 percent of Cu, 0.86 to 0.90 percent of Mn, 1.19 to 1.24 percent of Mg, less than or equal to 0.04 percent of Cr, less than or equal to 0.06 percent of Zn, 0.01 to 0.025 percent of Ti and the balance of Al. The preparation method comprises the following steps: (1) smelting and casting; (2) homogenizing; (3) hot rolling: performing multi-pass hot rolling on the homogenized aluminum alloy cast ingot to obtain a hot-rolled coiled material, and controlling the finish rolling temperature to be greater than or equal to 330 DEG C; (4) cold rolling: after the hot-rolled coiled material is cooled, performing multi-pass cold rolling to obtain a cold-rolled finished product, and annealing the cold-rolled finished product after cold rolling; (5) foil rolling is carried out, after the annealed cold-rolled finished product is cooled, multi-pass foil rolling is carried out, and primary foil rolling intermediate annealing is carried out between foil rolling passes; and (6) slitting to obtain the battery aluminum foil. The ultrahigh-strength tensile battery aluminum foil is obtained by combining alloy component regulation and control with a preparation process.

The invention provides a high-hardness cobalt-based alloy welding wire and a preparation method thereof, and the high-hardness cobalt-based alloy welding wire comprises the following components in percentage by mass: less than or equal to 0.5% of C, 3-4% of Si, 15-20% of Cr, 1-4% of Ni, 25-30% of Mo, 45-55% of Co, less than or equal to 1% of Fe, less than or equal to 0.02% of La, less than or equal to 0.02% of B, less than or equal to 0.01% of S and less than or equal to 0.01% of P. According to the cobalt-based welding wire, through regulation and control of alloy elements, the hardness of the cobalt-based welding wire is remarkably improved, the uniformity of components of the welding wire is improved, the welding strength is improved, the size of the welding wire is extremely thin, and the welding manufacturability of the welding wire is improved.

The invention provides steel for a high-temperature-resistant and high-conductivity electrolytic aluminum anode steel claw and a preparation method, and relates to the technical field of steel materials for production in the electrolytic aluminum industry. Trace alloy elements are added, the alloy elements and the proportion of the alloy elements are controlled, a corresponding preparation technology is combined, the solid solution and precipitation amount is controlled, and the novel steel for the electrolytic aluminum anode steel claw with the room-temperature performance, the high-temperature performance and the high conductivity is obtained. The high-temperature-resistant and high-conductivity steel for the electrolytic aluminum anode steel claw is prepared by regulating and controlling the (Ti + Mo) / C ratio, adding the Cu element, selecting low-cost raw materials, carrying out soaking section heat preservation treatment before hot rolling and carrying out rolling reduction stage control in the hot rolling process; the method is simple and easy to operate, environmentally friendly, low in cost, short in process, high in efficiency, wide in application range and beneficial to industrial large-scale production and popularization.

The invention discloses a layered structure metal composite material based on a liquid phase separation phenomenon and a preparation method thereof, and the preparation method comprises the following steps: step 1, weighing raw materials which comprise at least two kinds of metal which is difficult to mix and melt; 2, the temperature of the metal material in the step 1 is increased to be above the liquidus of the metal material, and a mixture with uniform components is obtained; (3) cooling the mixture smelted in the step (2) to a liquid-phase non-mixed-melting temperature interval until the mixture is completely separated; and 4, the required metal composite material with the layered structure can be obtained after cooling. According to the invention, a method of continuous liquid phase separation and melt solidification along with a furnace is adopted, and the preparation of the layered composite material is realized by regulating and controlling alloy elements and process parameters; the preparation method is easy to operate, low in cost and high in efficiency, a metallurgical bonding interface can be obtained, and the problem that the bonding strength of a dissimilar material composite interface is low is solved.

The invention relates to the technical field of low-temperature studs and bolts, and discloses a low-temperature stud steel hardenability optimization treatment method which comprises the steps of S1, a pretreatment method, S2, quenching method optimization, S3, tempering method optimization, S4, a post-treatment method and S5, a performance verification method. According to the method, the low-temperature impact stability is remarkably improved, the low-temperature impact energy of the material at about-100 DEG C can stably reach 35 J or above by accurately controlling the proportion of alloy elements and optimizing the heat treatment process (for example, the tempering temperature is increased to 640 DEG C or above and the heat preservation time is prolonged), the low-temperature impact energy is improved by about 20%-30% compared with a traditional process, and the problem that the low-temperature impact performance of the wire rod fluctuates is thoroughly solved; and the service safety in a low-temperature environment is ensured.

The invention relates to the technical field of metal materials, and discloses a light high-strength zinc alloy and a preparation method and application thereof.The zinc alloy takes aluminum and magnesium as main alloy elements, scandium-yttrium pre-alloying components, cerium-lanthanum composite rare earth and a nano TiB2 particle reinforced phase are introduced, and grain refinement and interface strengthening are achieved through the synergistic effect of multiple components; the preparation method comprises the key processes of pre-alloy smelting, dynamic magnetic field assisted die casting, gradient aging treatment and the like, and the defects of melt oxidation and solidification are effectively controlled. The zinc alloy has low density, high specific strength, corrosion resistance and excellent surface treatment adaptability, is suitable for manufacturing of precise metal fasteners such as belt buckles, belt buckles and shoe buckles, can remarkably improve the anti-fatigue performance and appearance quality of products, meanwhile, reduces processing energy consumption and material loss, and meets the market requirements of light-weight and high-end hardware fittings.

The present invention relates to a heat-treatment-free, high-strength and high-toughness die-casting aluminum alloy, a product prepared therefrom, and a preparation method therefor. The die-casting aluminum alloy includes, in addition to Al and unavoidable impurity elements, the following chemical components by mass percentage: 6.5-9.5% of Si, 0.1-0.3% of Fe, 0.4-0.85% of Mn, 0.1-0.6% of Mg, 0.1-0.9% of Cu, 0.02-0.12% of Ti, and 0.05-0.15% of Sb; at the same time, said components satisfy the following equations: Fe + Mn ≥ 0.65%, Mn / Fe = 2.0-6.6, each element symbol in the equations representing the mass percentage content of the corresponding element. The present invention solves the problem with this type of heat treatment-free die-casting alloy that Sb deteriorates and causes a melt to absorb gas, leading to elongation not being stable, thus enabling an aluminum alloy die-cast piece to obtain a structure having no significant holes or porosity defects at any location within, thereby ensuring an elongation of 10% or greater at every position of the part while tensile strength is 230 MPa or greater and yield strength 150 MPa or greater.

The invention relates to the technical field of manufacturing of engineering machinery parts, and discloses an engineering machinery driving wheel made of a medium carbon alloy cast steel material. The invention also discloses a preparation process of the engineering machinery driving wheel material, which comprises the following steps: S1, casting treatment: melting the medium carbon alloy steel material, and casting into a driving wheel blank; s2, normalizing heat treatment: carrying out normalizing heat treatment on the driving wheel blank; s3, rough machining treatment; s4, quenching treatment: carrying out induction quenching treatment; and S5, finish machining treatment. The synergistic effect of alloy elements in a medium carbon alloy cast steel material is combined with an optimized air cooling process, so that the cast steel is normalized to obtain a uniform structure which mainly contains superfine pearlite and contains extremely little ferrite, the matrix hardness is stable, and the requirement of a high-performance driving wheel is completely met; after the process route is improved, tempering and shot blasting and flaw detection procedures after tempering are canceled; the technological process is greatly shortened, material turnover is reduced, and the production efficiency is improved.

The invention relates to precipitation-hardening stainless steel and a preparation method and application thereof. The stainless steel comprises the following chemical components: 0.05%-0.25% of C, 0-0.15% of Si, 0.2%-0.5% of Mn, 9%-18% of Cr, 0.2%-5% of Ni, 0.5%-5% of Mo, 0-0.5% of V, 5%-13% of Co and the balance of Fe and inevitable impurities. During preparation, alloy raw materials are forged or rolled after being smelted and cast, or prepared into spherical alloy powder through an atomization method / rotating electrode method and then subjected to 3D printing, a formed component is prepared, and then the product is obtained through aftertreatment. By controlling the proportion of alloy elements and cooperating with an optimized post-treatment process, the dispersion degree and strengthening effect of second-phase precipitation are improved, impact toughness is improved, 3D printing cracking is avoided, excellent comprehensive mechanical properties, especially high-temperature strength, are obtained, the fatigue cracking risk is reduced, the service life is prolonged, and the production cost is reduced. And the corrosion resistance of polishing, machining and complex environments is improved, and the mold can be used in the field of molds.

Disclosed in the present invention is a high-strength, high-toughness and high-hardenability gear shaft steel. The steel contains Fe and inevitable impurities, and the following chemical elements in percentage by mass: C: 0.16%-0.22%, Si: 0.10%-0.40%, Mn: 0.86%-1.24%, Cr: 0.95%-1.44%, Al: 0.02%-0.05%, Ti: 0.015%-0.039%, Nb: 0.001%-0.034%, N: 0.006%-0.015%, and B: 0.0006%-0.0034%, wherein a microalloying element coefficient rM / N of the steel ranges from 1.5 to 5.0, and rM / N=(10*[Nb] / 93+[Ti] / 480+[Al] / 27) / ([N] / 14). In addition, further disclosed in the present invention is a manufacturing method for the high-strength, high-toughness and high-hardenability gear shaft steel. The high-strength, high-toughness and high-hardenability gear shaft steel of the present invention has high hardenability, narrow hardenability bandwidth, and good high-temperature grain stability.

The invention discloses a high-rigidity Mg-Al series magnesium alloy material which comprises main alloy elements Al and Ca, the content of Ca is 15 wt.%-30 wt.%, and the mass ratio of Ca to Al is 0.4-1. Preferably, the content of Ca is 15.5 wt.%-27 wt.%, and the total content of Al and Ca is greater than or equal to 31 wt.%. By regulating and controlling the Ca content and the Ca / Al mass ratio, a high-modulus C36 or C15 phase is formed to the maximum extent, and plasticity is kept while the elasticity modulus is improved. The magnesium alloy material is high in elasticity modulus, high in rigidity and good in heat resistance, and can be applied to service scenes with higher requirements for material light weight, rigidity, dimensional stability and wear resistance.

The invention relates to the technical field of high-speed tool steel, in particular to cobalt-containing high-speed tool steel and a preparation method thereof.The preparation method comprises the following steps that raw materials including, by weight, 55-60 parts of Fe, 2-5 parts of Mo, 2-4 parts of W, 0.5-0.8 part of V, 0.2-0.5 part of Co, 0.1-0.2 part of C and 0.1-0.2 part of rare earth elements are weighed; according to the cobalt-containing high-speed tool steel, through precise control over the content of alloy elements such as C, Mo, W, V and Co, ideal technical indexes of metallographic structures and machining performance are achieved, so that it is guaranteed that after heat treatment, ideal wear resistance and hardness are achieved, the wear resistance, impact resistance and hardness of a product are improved in a balanced and coordinated mode, and the effects of corrosion resistance and cold and heat resistance stability of the product are remarkable.

The invention provides high-toughness hydrogen sulfide corrosion-resistant steel for a seamless steel pipe for drilling and production, a production method of the high-toughness hydrogen sulfide corrosion-resistant steel, a seamless steel pipe heat treatment process and application of the high-toughness hydrogen sulfide corrosion-resistant steel. The high-toughness hydrogen sulfide corrosion-resistant steel comprises the following components: 1.00-1.30% of Cr, 0.50-0.70% of Ni, 0.90-1.10% of Mo, 0.020-0.050% of Al, 0.10-0.20% of V, 0.10-0.20% of Nb, 0.20-0.25% of C, 0.15-0.30% of Si, 0.50-0.70% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0015% of S and the balance of Fe and inevitable impurities. A Cr-Mo-Ni system is adopted and supplemented with microalloy elements such as Nb and V to improve the obdurability and improve the SSC resistance. And through two times of thermal refining, the dislocation density of the material is reduced, and the loading strength of a NACE TM0177 standard A solution is met.

The invention discloses a high-alloy wear-resistant roller repair welding material, and belongs to the technical field of alloy repair welding. The method is achieved through the three steps of a coal mill roller sleeve, a lining tile deposited metal formula, an alloy element transition coefficient formula and wear-resistant surfacing flux-cored wire preparation. The self-protection flux-cored wire can be suitable for various welding positions, and single-face welding and double-face forming are good; the production efficiency is high, and compared with manual welding, the allowable welding current of the self-protection flux-cored wire is large, and the deposition efficiency is high. According to the method, various hole pattern design methods including a strip steel edge and circumference combined bending method are adopted, the hole pattern of the roller is subjected to improved design, the forming mode of a steel strip on a wire rolling machine is changed, finally, a lap joint O-shaped section is formed, and the quality of the flux-cored wire is improved. The carbide in the welding wire surfacing sample is finer, more in quantity and more regular in arrangement.

The invention discloses a production method of a novel rare earth submerged arc welding wire steel wire rod for pipeline steel. The specific technological process is as follows. Blast furnace molten iron preparation, molten iron pretreatment, converter top and bottom combined blowing smelting, LF refining, VD vacuum treatment, small square billet continuous casting, steel billet heating, high-pressure water descaling, rough rolling, flying shearing, intermediate rolling, kick shearing, finish rolling, controlled cooling water tank, spinning, stelmor cooling, coil collecting, trimming, sampling inspection, collecting and bundling and weighing -a finished wire. According to the novel production method of the rare earth submerged arc welding wire steel wire rod for the pipeline steel, by adding rare earth elements and novel alloy elements, the comprehensive performance, including but not limited to the low-temperature toughness impact performance, strength, toughness, corrosion resistance and the like, of welding wire steel is improved. Meanwhile, the rare earth element and the nickel element are added, the smelting process is optimized, composition segregation and inclusions are reduced, the porosity is reduced, and the strength and toughness of the welding wire steel are improved.

The invention discloses an aluminum alloy material for a new energy automobile and a preparation method of the aluminum alloy material, and belongs to the technical field of aluminum alloy materials. The aluminum alloy material comprises, by mass, 0.5%-0.6% of silicon, 0.95%-1.05% of magnesium, 0.15%-0.25% of copper, 0.1%-0.2% of iron, 0.02%-0.025% of titanium, 0.05%-0.15% of chromium, smaller than or equal to 0.15% of manganese, smaller than or equal to 0.25% of zinc, smaller than or equal to 0.1% of other inevitable impurity elements and the balance aluminum. According to the aluminum alloy material, the electrical conductivity of the aluminum alloy material is improved by optimizing the content of alloy elements, reducing the grain boundary and dislocation density, enhancing material heat treatment and the like, and the electrical conductivity and the mechanical property are jointly improved. The aluminum base material of the aluminum alloy material adopts 99.70% high-purity aluminum and 6061 aluminum alloy extruded white material blends, the advantages of the 99.70% high-purity aluminum and the 6061 aluminum alloy extruded white material blends can be combined, and the aluminum alloy material with conductivity and high strength is obtained.

The invention discloses a cross-scale graphene / aluminum composite material machine learning design method, and belongs to the technical field of metal material property prediction. In order to inhibit serious interface reaction of graphene and a metal matrix at an interface, a method for accelerating a first principle by machine learning is utilized, alloy elements suitable for segregation towards a graphene / aluminum interface are selected in a periodic table range of elements, and elements suitable for being doped in the aluminum matrix and having no negative influence on mechanical properties of the matrix are selected; the influence of graphene distribution and temperature on the mechanical property of the cross-scale graphene / aluminum composite material is determined through a molecular dynamics simulation method, and the preparation process range of the cross-scale graphene / aluminum composite material is determined; alloy elements suitable for segregation to a graphene / aluminum interface and elements suitable for being doped in an aluminum matrix and having no negative influence on mechanical properties of the matrix are compared to obtain an intersection, doped elements are determined, and then experimental verification is performed based on a preparation process of the cross-scale graphene / aluminum composite material.