30results about How to "High yield strength" patented technology

The application discloses a nickel-based flux-cored wire for LNG storage tanks and a preparation method and application thereof, and belongs to the technical field of welding material flux-cored wires, and solves the problem that the mechanical properties and toughness of a weld after welding of an existing welding wire used for welding 9Ni steel plates are not matched with the 9Ni steel, thereby leading to low service life of the storage tank. The nickel-based flux-cored wire comprises a core and a cladding layer cladded outside the core; the cladding layer comprises, in percentage by mass, C: 0.015%, Cr: 14.5%-20.0%, S: 0.04%, P: 0.04%, and the balance of Ni and inevitable impurities; and the core comprises, in percentage by mass, Co: 0.5%-2.5%, Cr: 13.0%-18.0%, Si: 0.15%, Al: 0.01%-0.03%, Mn: 0.001%-0.02%, Mo: 15%-17%, W: 10%-20%, Fe: 10%-15%, and the balance of Ni and inevitable impurities.

This invention provides a hot-rolled strip quality prediction method and system based on PINN modeling and cross-modal graph learning, belonging to the fields of industrial intelligent manufacturing and hot-rolled strip quality monitoring. The method first acquires historical production process variable data, strip quality data, and sensor monitoring data; it then constructs a temperature field model of the hot-rolled strip water-cooling process based on PINN, and uses the trained temperature field model to solve the continuous temperature field during the laminar cooling stage, extracting temperature field features; it constructs modal subgraphs for both temperature field features and sensor features, building a cross-modal full graph structure; a preliminary prediction model is built based on GNN, using the cross-modal full graph structure as the model input layer structure, and N base learners based on a residual learning strategy are introduced into the output layer. The trained preliminary prediction model and the N base learners constitute the hot-rolled strip quality prediction model. This invention achieves a deep integration of physical mechanisms and deep learning, significantly improving the accuracy and robustness of hot-rolled strip quality prediction.

The application discloses a kind of local reinforcement selected area laser melting deposition high-strength titanium alloy preparation method and system, belong to additive manufacturing technical field.The local reinforcement selected area laser melting deposition high-strength titanium alloy preparation method provided by the application, by establishing target titanium alloy structure three-dimensional model and carrying out finite element limit load simulation analysis, stress distribution and potential dangerous area are identified;Based on the analysis result, the performance requirement is divided, the material enhanced local area is determined, and the laser scanning path and powder feeder movement trajectory are planned;Path file is imported into composite equipment to set process parameters;Titanium-based composite material powder is selectively laid in the enhanced area, and a locally reinforced structure is obtained by selective laser melting.The scheme realizes the spatial selective distribution of powder composition, forms a uniform distribution of high-stress areas, significantly improves the local strength and maintains the overall strength and plasticity matching, effectively solves the problem of insufficient performance matching of titanium alloy components under complex load.

This invention discloses a composite deformation heat treatment process for improving the strength and corrosion resistance of aluminum-lithium alloys, belonging to the field of aluminum-lithium alloy preparation technology. The composite deformation heat treatment process for improving the strength and corrosion resistance of aluminum-lithium alloys of this invention includes the following steps: (1) performing solution treatment, water quenching, and natural aging treatment on the aluminum-lithium alloy in sequence; (2) performing pre-deformation treatment on the aluminum-lithium alloy treated in step (1); (3) performing non-isothermal aging treatment on the aluminum-lithium alloy treated in step (3); wherein, the pre-deformation amount of the pre-deformation treatment is 4~10%; the non-isothermal aging treatment is to first raise the temperature from 40℃ to 140~200℃ and then lower the temperature to 100~160℃; the aluminum-lithium alloy treated by the composite deformation heat treatment process of this invention has both good mechanical properties and corrosion resistance.

The application discloses a kind of photovoltaic welding band and preparation method thereof, belong to photovoltaic material technical field.The method includes: in-situ chemical reduction preparation silver coating five silver nanometer reinforcing agent, silver nanoparticle uniform load forms core-shell structure;Ultrasonic-assisted smelting Sn-Bi-Ag-Cu quaternary solder master alloy;Copper band microetching forms Ra0.35-0.55 μm porous structure;Silane bridging hot-dip plating, control solder layer thickness 18-22 μm, staged cooling.Compared with prior art, the welding band tensile strength of the application is improved, the solder joint shear force is improved, the wet heat aging retention rate is in high position, the interface hole rate is reduced, the reliability and welding performance are significantly improved, and is suitable for high-efficiency photovoltaic module.

This invention discloses a heat treatment method for improving the yield strength ratio of steel used in continuous extrusion dies. Specifically, the steel is subjected to the following sequential heat treatments: high-temperature normalizing, low-temperature normalizing, spheroidizing annealing, high-temperature quenching, high-temperature tempering, and low-temperature tempering. The high-temperature normalizing temperature is 1070℃~1100℃; the low-temperature normalizing temperature is 710℃~730℃; the spheroidizing annealing temperature is 840℃~870℃; the high-temperature quenching temperature is 1070℃~1100℃; the high-temperature tempering temperature is 620℃~640℃; and the low-temperature tempering temperature is 530℃~550℃. The yield strength ratio of the die steel after heat treatment using this method is ≥0.91, and the hardness is 48~52 HRC.

The application provides an acid core wire and a preparation method and application thereof, and particularly relates to the technical field of welding materials. The core wire comprises a steel belt sheath and a core filled in the steel belt sheath. The core comprises the following components in percentage of mass: 35-50% of rutile, 2.5-5% of zircon sand, 2.5-5% of potassium feldspar, 1.5-3% of potassium fluozirconate, 1.5-3% of quartz, 15-20% of metallic manganese, 3-5% of ferrosilicon, 15-20% of nickel powder, 1-2% of cobalt powder, 1-2% of molybdenum powder, 1-2% of aluminum-zirconium alloy, 1.5-3.5% of magnesium powder, 1-2% of perovskite, and the rest is atomized iron powder. The acid core wire has good welding process, good arc stability, less spatter, good appearance of weld formation, good deslagging property, high deposition rate and deposition rate, and the weld has the characteristics of high strength, high low-temperature impact toughness and corrosion resistance, and can meet the use requirement of high-strength Q690 rack steel.

According to the present disclosure, a steel frame for a photovoltaic module is formed by bending a single alloy-plated steel sheet, and the steel frame for the photovoltaic module includes a frame member having an insertion portion into which a photovoltaic panel is inserted and a cavity portion formed with a closed cross section. The alloy-plated steel sheet includes a Mg-Al-Zn-based plating layer on a surface of a steel sheet having a yield strength of 280 MPa to 350 MPa.

This invention relates to the field of hot extrusion manufacturing technology, specifically to a high-strength weldable 6xxx series aluminum alloy profile, its manufacturing method, and its application. The aluminum alloy profile is composed of the following weight percentages: Si: 0.80%~1.2%, Fe≤0.20%, Cu: 0.40%~0.80%, Mn: 0.30%~0.70%, Mg: 0.70%~1.1%, Cr≤0.25%, Zn≤0.10%, Ti≤0.10%, Zr: 0.05%-0.20%, Pb<0.01%, with the balance being Al and unavoidable impurities. The profile meets the following performance requirements: tensile properties, R... m ≥420MPa, R p0.2 ≥330MPa, A 50mm ≥8.0%; Fatigue performance: at r=0.1, N=1×10 7 Under the same conditions, the fatigue strength σ of the smooth sample is ≥145MPa, realizing the lightweight manufacturing of high-speed trains.

This invention belongs to the field of stainless steel. Specifically, this invention relates to a fine-grained, high-strength, and high-toughness soft magnetic stainless steel synergistically strengthened by Ti and Cu, and soft magnetic stainless steel profiles containing the same. The soft magnetic stainless steel of this invention is composed of the elements Cr, Cu, Mo, Ti, C, Fe, and unavoidable impurities. In the preparation process of the soft magnetic stainless steel profile of this invention, according to the composition, the material is smelted and processed through steps such as solution treatment, hot rolling, cold drawing, recrystallization annealing, and aging. The process parameters in each step are strictly controlled to prepare a soft magnetic stainless steel profile with a fine and uniform microstructure, strengthened by trace carbide precipitation and high-density dispersed coherent nano-precipitates, and possessing excellent low-temperature toughness and soft magnetic properties. The fine-grained, high-strength, and high-toughness soft magnetic stainless steel profile synergistically strengthened by Ti and Cu of this invention can be effectively applied to solenoid valves and related products that operate in low-temperature media and require certain strength and toughness, and has good prospects for promotion and application value.

This invention discloses a low-alloy medical-grade heterogeneous magnesium alloy, its preparation method, and its applications. The preparation method includes: melting a magnesium matrix under a protective atmosphere to obtain a melt; maintaining a constant temperature and under stirring conditions, adding an alloying element to the melt for smelting to obtain an alloy melt; lowering the temperature of the alloy melt, removing slag to obtain a melt to be cast, then casting it into a mold and air-cooling it to obtain an alloy ingot; holding the alloy ingot in an oxygen-free environment and water-quenching it to obtain a solid solution alloy billet; removing the oxide layer from the surface of the solid solution alloy billet, preheating it at 330~380℃ for 1~1.5h, and then hot-extruded it at 330~380℃, followed by air cooling to obtain a low-alloy medical-grade heterogeneous magnesium alloy. This invention introduces an alloying element into the magnesium matrix and further optimizes the hot extrusion temperature and extrusion ratio to obtain a low-alloy medical-grade heterogeneous magnesium alloy with a heterogeneous structure.

This application relates to the field of alloy technology, disclosing a 1300MPa grade high-strength, high-toughness seamless gas cylinder steel and its manufacturing method. The chemical composition of the 1300MPa grade high-strength, high-toughness seamless gas cylinder steel, by mass percentage, includes: C: 0.2%~0.3%, Si: 0.25%~0.55%, Mn: 0.8%~1.5%, Cr: 0.7%~1.5%, Mo: 0.3%~0.8%, Ni: 1.0%~1.5%, V: 0.1%~0.3%, Nb: 0.02%~0.05%, P≤0.020%, S≤0.010%, P+S≤0.025%, with the remainder being Fe and unavoidable impurities. In this application, the 1300MPa grade high-strength, high-toughness seamless gas cylinder steel combines high strength with good low-temperature transverse impact toughness.

The object of this invention is to provide a steel plate with excellent ductility and expandability, and a yield strength (YP) of 450 MPa or higher, and a method for manufacturing the same. A steel plate comprising, by mass%, C: 0.05% or more and 0.13% or less, Si: 0.01% or more and 0.04% or less, Mn: 0.1% or more and 0.6% or less, P: 0.02% or less, S: 0.02% or less, Al: 0.01% or more and 0.10% or less, N: 0.0005% or more and 0.0040% or less, Ti: 0.005% or more and 0.030% or less. The composition consists of Nb: 0.005% or more and 0.030% or less, Mo: 0.01% or more and 0.05% or less, B: 0.0005% or more and 0.0050% or less, with the balance being iron and unavoidable impurities. The microstructure is ferrite with an area ratio of 90% or more. The total amount of Ti and Nb, in the form of carbonitrides, is 0.005% or more by mass.

This invention discloses a 635MPa grade niobium-vanadium-chromium composite reinforced high-performance steel bar and its smelting method. By controlling the chemical composition and V / N mass ratio of the steel bar within the range of 3.35 to 3.75, and employing a multi-element composite strengthening formula of niobium, vanadium, and chromium to replace the traditional single vanadium-nitrogen alloy addition mode, production costs are reduced. During the smelting process, a dedicated dry powder stirring device is used to pre-mix the microalloying reinforcing agent, achieving uniform mixing of powder components and removal of magnetic impurities. Simultaneously, a composite desulfurizing agent is introduced and a step-by-step addition process is adopted, combined with a gradient ladle bottom-blowing argon stirring system, to effectively reduce the sulfur content in the steel. The steel bar prepared by this invention has a uniform microstructure, high grain size, and excellent mechanical properties such as tensile strength, yield strength, strength-to-yield ratio, and elongation. It exhibits good product consistency, low production costs, and can stably mass-produce high-performance 635MPa grade high-strength earthquake-resistant steel bars.

The application relates to a BD2 alloy nodular cast iron roller and a preparation process thereof, and relates to the technical field of rollers, and comprises smelting and pouring, stepped hole type pre-casting, and accurate back-temperature spray quenching treatment. Through the synergistic process of the stepped hole type pre-casting and the accurate back-temperature spray quenching, the problems of easy cracking and uneven hardness of the BD2 deep groove roller are solved from two aspects of physical structure and thermodynamics. Through a further micro-alloying improvement scheme, the traditional BD2 alloy strengthening idea of serious dependence on expensive nickel elements is broken through, trace amounts of aluminum and nitrogen elements are accurately introduced on the basis of reducing the nickel content, the in-situ synthesis and uniform dispersion distribution of high-melting-point AlN nano particles are realized by using the strong chemical affinity of the two in the iron liquid and a synchronous feeding technology of cored wires.

The present invention provides a cold rolled steel material including, by weight, 0.04% to 0.07% of carbon (C), 0.1% to 0.3% of silicon (Si), 1.1% to 1.5% of manganese (Mn), 0.015% to 0.06% of aluminum (Al), more than 0% to 0.02% of phosphorus (P), more than 0% to 0.005% of sulfur (S), 0.02% to 0.04% of niobium (Nb), 0.17% to 0.23% of titanium (Ti), more than 0% to 0.1% of chromium (Cr), more than 0% to 0.005% of nitrogen (N), and a balance of iron (Fe) and other inevitable impurities, and having a yield strength (YS) of 600 MPa to 900 MPa, an elongation (EL) of 8% or more, and a yield ratio (YR) of 95% or more.

The application discloses a heat treatment-free die-casting aluminum alloy and a preparation method and application thereof, the aluminum alloy comprises Al, Si, Zn, Mg, Mn, Zr, V and optional Sr, and inevitable impurities, the impurities comprise Fe and other impurities except Fe, and the content of each component is further controlled; during preparation, the constituent metals and / or intermediate alloys of the alloy are melted, then refined, and optionally subjected to modification treatment by using Sr or an intermediate alloy containing Sr, and optionally subjected to degassing treatment, so that a pure melt of the aluminum alloy can be obtained, and the aluminum alloy is further die-cast into an aluminum alloy casting; practice shows that the heat treatment-free die-casting aluminum alloy can at least have the advantages of high tolerance to impurities Fe, non-use of rare earth elements, reduction of the use amount of expensive elements, and still having excellent mechanical properties without heat treatment, and in addition, natural aging and baking strengthening can be realized.

The application provides a kind of superhigh strength corrosion-resistant low alloyed Mg-Al-Mn-Y-Zr alloy and its preparation method, belongs to magnesium alloy technical field.The application uses magnesium, aluminum, magnesium manganese intermediate alloy, magnesium yttrium intermediate alloy, magnesium zirconium intermediate alloy as raw material, is prepared into high-strength corrosion-resistant magnesium alloy after melting casting, solid solution treatment, low-temperature extrusion, the components of the alloy are Al:0.1%;Mn:0.1%;Y:0.1%;Zr:0.1%, the rest is magnesium and unavoidable impurities.The alloy prepared by the application has elongation of 5%, tensile strength of 501.3MPa, yield strength of 400.9MPa, corrosion rate in simulated body fluid of 0.07mm / a, and the preparation method has the advantages of low cost, simple process, short process, etc.

The present invention provides a laminate having high 0.2% yield strength (also referred to simply as yield strength), which is an index of strength against plastic deformation. The laminate, which is a laminate comprising a resin film and a metal layer provided on at least one face of the resin film, satisfies the following relation of Formula (I) with respect to a cross-sectional curve of an interface between the resin film and the metal layer obtained from a cross-sectional image in a thickness direction of the laminate taken by a scanning electron microscope: [∑(Ln / Sn)] / Na ≥ 0.046 (in Formula (I), Ln represents a contour length (nm) of each convex region enclosed by a straight line connecting minimum points between each convex portion of the cross-sectional curve and the cross-sectional curve, Sn represents an area (nm 2 ) of each of the convex regions, and Na represents a total number of the plurality of convex regions), and an evaluation length of the cross-sectional curve is 3,000 nm or more.

The application relates to an additive manufacturing aluminum alloy and a processing method and application thereof, wherein the processing method mainly comprises the following steps: S1, preparing an aluminum alloy powder raw material; S2, additive manufacturing the aluminum alloy powder raw material to obtain a formed piece; S3, first-stage heat treatment of the formed piece under a first temperature condition, and cooling to room temperature after completion; and S4, second-stage heat treatment of the formed piece under a second temperature condition to obtain a sample; wherein the second temperature condition is greater than the first temperature condition, so that fine nanoscale precipitated phases are uniformly and dispersedly distributed. The processing method of the additive manufacturing aluminum alloy can obtain an aluminum alloy with excellent yield strength and tensile strength, good plasticity and reduced manufacturing cost.

The application discloses an integrally die-casting metal single plate and a manufacturing method thereof. The metal single plate comprises a plate surface, the back surface of the plate surface is provided with ribs, the peripheral edge of the plate surface is provided with a side wall bent to the back surface, and a connecting piece is arranged on the peripheral side wall. The plate surface, the ribs, the side wall and the connecting piece are integrally die-cast. The application solves the problems of long processing and production period, many production links, unstable assembly quality, large geometric dimension error, poor surface flatness, poor interchangeability and large material loss of the existing metal single plate.

The present application relates to the technical field of stainless steel, in particular to a 0Cr15Ni5Cu4Nb stainless steel and a preparation method of a rod thereof; the chemical components include: C: 0.03%-0.05%, Cr: 14.0-15.5%, Ni: 3.5-5.5%, Cu: 2.5-4.5%, Nb: 5 times of the content of C-0.45%, Si≤1.00%, Mn≤1.00%, S≤0.005%, P≤0.010%, O≤0.002%, N≤0.001%, and the balance of Fe. The preparation method is realized based on the above chemical components. The present application cooperatively optimizes the deformation amount and the terminal temperature in the last forging process, so that the precipitation strengthening phase (such as copper-rich phase) is more fine and dispersedly distributed, the precipitation strengthening effect is improved, and the more fine grains are obtained, which is helpful to improve the strength and toughness of the material.

The present invention relates to a high bendability press-hardened steel part having a composition comprising, in percentage by weight: C: 0.05-0.14%, Mn: 1.4-2.5%, Si: 0.1-1.5%, Al: 0.02-0.1%, Cr: 0.01-1.0%, B: 0.0005-0.004%, Ti: 0.01-0.1%, P < 0.020%, S < 0.010%, N < 0.02%, and optionally comprising one or more of the following elements: Ni < 0.4%, Mo < 0.40%, Nb < 0.08%, Ca < 0.1%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting. The press-hardened steel part comprises: a bulk having a microstructure comprising 85% or more of martensite, the rest being bainite, in surface fraction; an interdiffusion layer having a thickness th inter ; a coating having a thickness th coat and based on aluminum, the ratio th inter / (th inter + th coat ) is greater than or equal to 70%.

The present application belongs to the technical field of punch forming, and relates to a packaging aluminum pipe punch forming device. The present application comprises a packaging aluminum pipe punch forming device, which comprises a die and a punch. A die cavity that is matched with the punch is formed in the die. A bar magnet is arranged in the punch. A radially magnetized annular magnet is arranged in the die. The axis of the radially magnetized annular magnet coincides with the axis of the die cavity. When the punch is inserted into the die cavity to punch, a radial repulsive force is generated between the radially magnetized annular magnet and the bar magnet, so that the punch is kept at the central position of the die cavity. The strong repulsive force generated by the same polarity of the radially magnetized annular magnet and the bar magnet can keep the punch at the central position, so as to resist the lateral force that causes the bending of the punch, and effectively prevent the bending and deformation of the punch. Therefore, the wall thickness uniformity and straightness of the formed packaging aluminum pipe are ensured.

This application provides a mid-frame, its manufacturing method, and an electronic device. The mid-frame of this application includes: a frame body having peripheral side surfaces, the frame body having a yield strength ranging from 480 MPa to 510 MPa; and an oxide film disposed on the peripheral side surfaces of the frame body, the oxide film having a thickness ranging from 9.3 μm to 12.1 μm. The mid-frame of this application exhibits high yield strength and good corrosion resistance.

The application provides a high-nitrogen nickel-free austenitic stainless steel bracket and a preparation method thereof, and belongs to the field of austenitic stainless steel. The method comprises the following steps: casting an initial molten steel into a consumable electrode, placing the consumable electrode in an electroslag remelting furnace, remelting and refining by using a mixed slag system of base slag and composite premelted nitride slag, and performing stepwise pressurization during the remelting process to obtain a steel ingot; homogenizing the steel ingot, and then performing multi-directional forging; performing high-temperature solid solution treatment on the forged blank, and then performing quenching; performing cold deformation processing on the plate, and then performing secondary solid solution treatment and quenching; machining the semi-finished product into the shape of a bracket, and then performing surface electrolytic polishing and passivation treatment to obtain the high-nitrogen nickel-free austenitic stainless steel bracket. Through the whole-process collaborative control from the material metallurgical source to the final forming, the harsh requirements of the high-nitrogen nickel-free austenitic stainless steel bracket on biocompatibility, mechanical properties and corrosion resistance as a long-term implanted instrument in the oral cavity are systematically met.

This invention discloses a lightweight modular FRP lifting device and its control method. The lifting device includes an expandable lifting frame body assembled from several basic structural units. Each basic structural unit adopts a steel-FRP composite structure, with an inner layer of I-beams and an outer layer of FRP fiber-reinforced fabric. A multi-degree-of-freedom adjustment mechanism is installed at the bottom of each basic structural unit. This mechanism includes a linear module and a winch. The linear module is set and fixed along the length of the basic structural unit, and the winch is fixed below the slider of the linear module. The winch's wire rope is connected to the lifting point of the building module to be lifted. The control method uses center-of-gravity calculation and a PID algorithm for real-time feedback control. This invention effectively solves the problems of heavy weight, difficult balance adjustment, and low level of intelligence in traditional lifting devices, achieving automatic leveling and precise positioning of the lifted building module, significantly improving lifting efficiency and safety.