1249 results about "Alloy element" patented technology

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.

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 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 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.

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 provides a preparation method of a high-temperature wear-resistant high-entropy alloy layer with a heterostructure, and belongs to the technical field of metal materials and surface engineering thereof. According to the method, a CoCrFeNiTi high-entropy alloy cladding layer is deposited on the surface of a base body through the laser cladding technology, and the thickness of the cladding layer is controlled to be 0.5-2 mm. The component of the cladding layer is CoCrFeNiTi, the atomic ratio content of Ti is controlled not to exceed 8%, so that the structure of the cladding layer is an FCC phase, and cracking of the cladding layer induced by precipitation of a BCC phase is avoided. A high-entropy alloy cladding layer is heated to 550-950 DEG C and subjected to heat preservation for 2-4 h for annealing treatment, alloy elements in the cladding layer are promoted to be separated out, and small heterogeneous strengthening phases such as a Ni3Ti phase and a laves phase are generated in situ. According to the method, a heterogeneous strengthening structure is formed under the condition of not adding exogenous elements, the strength and hardness and high-temperature wear resistance of the cladding layer are greatly enhanced, the method has the advantages of being simple in process, low in cost, high in applicability and the like, and an effective technical scheme is provided for repairing and remanufacturing of the high-entropy alloy.

The invention relates to the technical field of metallurgy, in particular to a hot galvanizing low-alloy high-strength steel plate which comprises the following chemical components in percentage by mass: 0.06%-0.08% of C, 0.20%-0.25% of Si, 1.20%-1.35% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020%-0.060% of Alt, 0.035%-0.050% of Nb, 0.010%-0.020% of Ti, less than or equal to 0.0050% of O, less than or equal to 0.0060% of N and the balance of Fe and inevitable impurities. The contents of C, Si and Mn in the chemical components are controlled, the welding performance of the hot-dip galvanizing low-alloy high-strength steel and the surface quality of a finished product are considered, Nb microalloying is mainly adopted, a proper amount of microalloy element Ti is added to form TiN, austenite grain coarsening is limited in the slab heating and heat preservation process, and fine and dispersed precipitated phases are finally obtained in combination with process control; the hot-dip galvanized low-alloy high-strength steel finished product is good in structure form and excellent in comprehensive performance.

The invention belongs to the technical field of electronic packaging and welding materials, and relates to lead-free solder powder for reflow soldering and a preparation method of the lead-free solder powder. The lead-free solder powder is based on a Sn-Ag-Cu alloy system, and melt purification, beta-Sn grain refinement and interface IMC stabilization are achieved by compositely adding trace Ce and Ni elements. The Sn-Cu-Ce alloy comprises the following components in percentage by mass: 2.9%-3.1% of Ag, 0.45%-0.55% of Cu, 0.01%-0.10% of Ce, 0.01%-0.05% of Ni and the balance of Sn and impurities. During preparation, a Ce-Ni intermediate alloy is adopted to introduce microalloy elements, and the spherical solder powder is obtained through vacuum melting, inert gas atomization and surface treatment. The obtained solder powder is low in oxygen content, good in wettability, slow in interface IMC growth after backflow, high in welding spot strength and excellent in thermal cycle reliability, and is suitable for the field of high-reliability electronic packaging.

The invention relates to a forging method of a high-strength, high-creep-resistance and high-structure-stability Ti1100 alloy bar, belongs to the technical field of titanium alloys, and aims to solve the problems that in the forging process of an existing method, macrosegregation is prone to occurring; at least one of the problems that the process is difficult to control due to narrowing of a machining window, forging is difficult due to great increase of deformation resistance, cracking is caused due to plasticity reduction, and the Ti1100 alloy bar is poor in structure stability and short in service time are solved. According to the forging method of the Ti1100 alloy bar, through one-heating-number blooming forging, one-heating-number grain refinement and homogenization forging and 2-4-heating-number cross-phase region forging, the problem of macrosegregation caused by high alloy element content in the forging process is solved; and the problems that the process is difficult to control due to narrowing of a machining window, forging is difficult due to great increase of deformation resistance, and cracking is caused due to plasticity reduction are solved.

The preparation method for improving the strength of the pure titanium bar comprises the following steps that firstly, zero-order large-particle sponge titanium and alloy element raw materials are mixed, pressed into an electrode block and welded, and a primary electrode is obtained; 2, performing vacuum consumable smelting for the third time to obtain a low-alloying titanium cast ingot; thirdly, cogging forging, upsetting and drawing deformation, remelting and drawing out are conducted, and a square blank is obtained; 4, heating and multi-pass rolling are conducted, and a bar billet is obtained; and 5, carrying out heat treatment, discharging and cooling to obtain the high-strength titanium bar. The low-alloying titanium cast ingot is obtained by properly increasing the content of Fe and O in the smelting process and adding not more than 0.5% of Al and not more than 1% of Zr, and the low-alloying titanium cast ingot is subjected to cogging forging, upsetting and drawing deformation, remelting, drawing, hot rolling and heat treatment in a matched mode, so that the effects that the structure is refined and uniform, and the strength is high are achieved. The tensile strength of the obtained high-strength titanium bar is about 50 MPa or above higher than that of conventional TA4, and batch production is easy to achieve.

The invention discloses a machine learning guidance laser forming ultrahigh strength and toughness steel design method based on fusion of physical and chemical characteristics, which combines the physical and chemical characteristics with Shapley additive interpretation and analysis, and overcomes the limitation that a traditional pure data driving model lacks theoretical support. The quantitative analysis of the influence between the input characteristics and the output performance is realized, the internal association between the physical and chemical characteristics and the material strengthening and toughening theoretical mechanism is disclosed, the contribution degree and the interaction effect of each alloy element and the heat treatment process parameters are determined, the theoretical basis of variable screening is provided for multi-objective optimization, and the optimization efficiency is improved. Therefore, the efficiency of obtaining the non-dominated solution set is remarkably improved. According to the method, the physical and chemical characteristic combination can be conveniently and rapidly determined, the relation between the input characteristic and the output performance can be quantified, and optimal design of the laser forming ultrahigh strength and toughness steel alloy components and the heat treatment process is achieved.

The invention provides a novel copper-free high-strength 7-series aluminum alloy and a preparation method thereof, and relates to the technical field of aluminum alloy design and processing. The alloy comprises the following chemical components in percentage by mass: 6.00-7.80% of Zn, 1.80-2.60% of Mg, 0.05-0.30% of Mn and the balance of Fe, Si and other impurity elements, 0.05%, and the balance being Al. The final-state novel copper-free high-strength 7-series aluminum alloy material is prepared through aluminum alloy element content selection and weighing, casting, two-stage heating and heat preservation treatment, hot extrusion machining, two-stage solution treatment and single-stage aging treatment. The novel alloy obtained through the method is few in element variety, low in total content, beneficial to recycling of the alloy, simple and easy to operate, environmentally friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention provides low-carbon steel for a seamless gas cylinder as well as a preparation method and application of the low-carbon steel. The preparation method comprises the steps that S1, raw materials are prepared according to components of the low-carbon steel for the seamless gas cylinder; s2, the raw materials are smelted, and a first steel billet is obtained; heating the first steel billet to obtain a second steel billet; s3, under the conditions that the initial rolling temperature ranges from 1120 DEG C to 1180 DEG C, and the final rolling temperature ranges from 880 DEG C to 980 DEG C, at least eight passes of hot rolling are conducted on the second steel billet, and a hot-rolled steel billet is obtained; s4, cooling the hot-rolled steel billet to obtain a third steel billet; and S5, the third steel billet is subjected to heat treatment, and the low-carbon steel for the seamless gas cylinder is obtained. Alloy element components of the low-carbon steel for the seamless gas cylinder are meticulously designed, meanwhile, a preparation technology is cooperatively matched, the comprehensive mechanical property of the obtained low-carbon steel is optimized, and more importantly, the low-carbon steel shows excellent impact toughness under the low-temperature condition.

The application provides an aluminum alloy, which comprises the following components in percentage by mass: Zn 4.0-5.0%, Mg 1.2-1.8%, Cu 0.1-0.3%, Zr 0.08-0.12%, Ti 0.02-0.06%, Fe less than or equal to 0.25%, and the balance of Al. The alloy elements containing Zn 4.0-5.0%, Mg 1.2-1.8%, Cu 0.1-0.3%, Zr 0.08-0.12%, Ti 0.02-0.06% and Fe less than or equal to 0.25% are added into a smelting furnace together with pure aluminum, smelted at 700-750 DEG C to form a melt, refined by blowing in inert gas or adding a refining agent, and the gas and inclusions are removed. The application utilizes the shearing force generated by the different rotating speeds of the upper and lower rollers of a differential rolling mill to break the coarse structure, refine the grains, and increase the dislocation density. The aluminum alloy is rolled at 480-500 DEG C to reduce the deformation resistance, promote dynamic recrystallization, maintain the processing performance, and further enhance the performance by 60-70% of the total deformation. After rolling, the aluminum alloy is subjected to multi-directional forging, the strain direction is changed multiple times, the grains are broken, the structure is homogenized, and anisotropy is eliminated, so that the comprehensive performance and application range of the aluminum alloy profile are improved. The problem that the structure cannot be refined and the dislocation density cannot be increased during the rolling process is solved.

The invention discloses a diesel engine piston material, a diesel engine piston casting method and a diesel engine piston, and relates to the technical field of composites.The diesel engine piston material comprises, by weight, 12.0%-12.5% of Si, 5.6%-5.8% of Cu, 3.0%-3.4% of Ni, 0.1%-0.3% of Mg, 0.1%-0.3% of Mn, 0.4%-0.6% of Fe, 0.10%-0.14% of Ti, 0.10%-0.14% of V, 0.10%-0.14% of Zr, 0.02%-0.06% of Cr and the balance Al and alkali metal impurity elements. The high-strength and heat-resistant aluminum alloy material special for the diesel engine piston is obtained by taking the aluminum alloy as a base body and coordinating multiple alloy elements and accurately regulating and controlling the proportion of all the alloy elements, the material meets the long-term service requirements of the high-load diesel engine piston at the high temperature of 350 DEG C and under the explosion pressure of 20 Mpa of 107 times or above high-frequency reciprocating loads, and the service life of the high-load diesel engine piston is prolonged. And the working conditions of high detonation pressure and thermal load of the diesel engine piston are met, so that the high-temperature mechanical property, long-term service reliability and safety stability of the piston are improved.

The invention relates to the technical field of metallurgy, in particular to 420MPa-grade low-alloy high-strength steel which comprises the following chemical components in percentage by mass: 0.06%-0.08% of C, 0.10%-0.15% of Si, 0.90%-1.25% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.015%-0.060% of Alt, less than or equal to 0.0060% of O, less than or equal to 0.0060% of N, 0.0010%-0.0040% of Ca and at least one microalloy element of 0.035%-0.055% of Nb, 0.010%-0.035% of Ti and 0.005%-0.015% of V. The addition amount of the microalloy elements meets the condition that Nb + Ti + V is more than or equal to 0.04% and less than or equal to 0.08%. If a microalloy element Ti is added, Ti / (C + N) is larger than or equal to 0.2 and smaller than or equal to 0.6, the stoichiometric ratio of Ti to N is 1.6-2.5, and the balance is Fe and inevitable impurities. The common cold-rolled or hot-galvanized low-alloy high-strength steel plate is produced by adopting the same components, so that the production organization difficulty and the process cost are reduced.

The invention discloses a production method of a low-cost carbon spiral spring steel wire rod, the chemical components of the steel grade do not contain precious alloy elements, the production process comprises the steps of converter top and bottom combined blowing smelting, LF refining, 6 # small square billet continuous casting, slow cooling and rolling in a wire factory, and the use requirements of users can be met without VD refining furnace production.

The application provides an aluminum alloy profile with high conductivity and high toughness and a production method thereof, and the aluminum alloy profile has the following components in mass fraction: Si: 0.08%-0.12%, Fe+Cu: 0.8%-1.1%, B: 0.03%-0.05%; wherein (Ti+Cr+V) is less than or equal to 0.006%, the total content of other impurity elements is less than or equal to 0.05%, and the balance is Al. The application selects reasonable alloy element ratio, follows the extrusion process, such as the process of the temperature of a casting bar and the extrusion speed, and ensures that the alloy performance meets the requirements in view of the fact that the aluminum alloy extrusion material needs to be drawn subsequently. The product obtained by the application does not need subsequent annealing treatment, and can obtain the aluminum alloy material with high conductivity and high toughness while meeting certain strength.

The thin-gauge ultrahigh-strength non-oriented silicon steel comprises the following chemical components in percentage by mass: less than or equal to 0.002% of C, 3.1%-4.0% of Si, 0.3%-0.7% of Mn, less than or equal to 0.01% of P, less than or equal to 0.001% of S, 0.5%-1.2% of Als, 0.01%-0.08% of Sn, less than or equal to 0.002% of N, less than or equal to 0.001% of Ti, less than or equal to 0.002% of Nb, less than or equal to 0.002% of V and the balance of Fe and inevitable impurities, and Sieq is equal to [wSi] + 2 [wAl]-0.5 [wMn]. According to the technical scheme, trace alloy elements do not need to be added, the alloy smelting difficulty can be reduced, the smelting production cost is saved, meanwhile, the means of increasing deformation structures and improving the content of silicon, aluminum and manganese elements are adopted, and the material has the advantages of being high in strength, high in electromagnetic performance and excellent in machinability at the same time.

The invention discloses a microalloyed high-toughness martensitic stainless steel cutter head as well as a preparation method and a preparation mold thereof. Stainless steel comprises the following components in percentage by weight: 0.3%-0.7% of C, 0.3%-1.0% of Si, 0.5%-1.5% of Mn, 16%-18.5% of Cr, 1%-2% of Ni, 0.3%-0.8% of Mo, 0.1%-0.35% of V, 0.1%-0.25% of Nb, less than or equal to 0.02% of S, less than or equal to 0.02% of P and the balance of Fe. Firstly, raw materials are smelted into molten iron; then adding a deoxidizing agent and precoated sand into the molten iron for molding, and performing sand mold casting and pouring to obtain a cutterhead blank; carrying out heat treatment on the cutter head blank; and finally, shot blasting and polishing are conducted on the cutterhead subjected to heat treatment. The martensitic stainless steel cutterhead has a metallographic structure which takes a martensitic structure as a main structure, takes austenite as an auxiliary structure and dispersedly distributes CrC, VC and NbC particles, the hardness of the martensitic stainless steel cutterhead is 40-45 HRC, the impact toughness of the martensitic stainless steel cutterhead reaches 92-95 J / cm < 2 >, the abrasion resistance of the cutterhead is longer, the service life of the cutterhead is longer, and the abrasion loss of the martensitic stainless steel cutterhead is reduced by 70% compared with a cutterhead without alloy elements.

The invention relates to the technical field of magnesium alloys, in particular to a low-density, high-modulus and ultrahigh-strength magnesium-based composite material and a preparation method thereof.The preparation method comprises the steps that SiC reinforcement particles are pretreated; the raw materials are proportioned according to the mass percent of the components of the magnesium alloy; melting pure magnesium, sequentially adding alloy elements, uniformly stirring, cooling to a semi-solid temperature interval, adding the pretreated SiC reinforcement particles, and casting in a preheating mold to solidify, so as to obtain a magnesium-based composite material cast ingot; the cast ingot is sequentially subjected to solution treatment and extrusion forming; carrying out secondary solution treatment on the magnesium-based composite material bar subjected to extrusion forming; and performing rotary swaging deformation and intermediate annealing treatment on the magnesium-based composite material bar subjected to secondary solution treatment to obtain the ultrahigh-strength magnesium-based composite material. Therefore, the problems that in the prior art, magnesium alloy is insufficient in strength and modulus, a magnesium-based composite material easily generates casting defects and is difficult to deform at room temperature, and the performance of the material is weakened due to grain growth during high-temperature deformation are solved.

The invention provides a metal material surface treatment method based on the synergistic effect of solid solution-aging heat treatment and laser shock. The metal material surface treatment method is used for remarkably improving the mechanical property of a metal material and the uniformity and stability of a microstructure. Different from a traditional single laser shock peening process, the heat treatment method is combined with laser shock, and the double effects of structure optimization and mechanical property enhancement are achieved. Specifically, firstly, alloy elements are subjected to sufficient solid solution in a matrix through solid solution-aging heat treatment, heat preservation is conducted at the low temperature so that a strengthening phase can be promoted to be separated out again, and the strengthening phase which is evenly and stably distributed is obtained; and then laser shock is applied to the surface of the material, deep residual compressive stress is introduced into the surface layer through high-energy pulse laser, and a nanocrystalline layer structure is formed. According to the synergistic process, the microstructure stability and uniformity of the material are effectively improved, and the mechanical property of the material is remarkably improved. The technology is suitable for the fields of aerospace, automobile lightweight structures, rail transit and the like, and has wide industrial application prospects.

The invention discloses a method for preparing bainite steel through multi-element microalloying, and belongs to the technical field of advanced steel and iron materials. The method comprises the following steps that a forged steel ingot is subjected to first austenitizing and cooling treatment, and a martensite matrix is obtained; and then secondary phase precipitation treatment, secondary austenitizing treatment and cooling are sequentially carried out, and the bainite steel is prepared. According to the invention, an innovative heat treatment process path of martensite initial structure-medium-temperature second phase precipitation-short-time austenitizing-salt bath isothermal bainite transformation is constructed, and the synergistic effect of microalloy elements such as V, Nb, Ti and B is combined, so that the heat treatment process has the advantages that the heat treatment efficiency is greatly improved on the premise of not depending on precious alloy elements such as Cr and Ni; and the superfine bainite steel which is uniform in structure and excellent in comprehensive performance is successfully prepared.

The invention relates to a delayed fracture resistant non-quenched and tempered 14.9-grade high-strength cold heading steel wire rod and a preparation method thereof. The wire rod comprises the following chemical components: 0.33%-0.55% of C, less than or equal to 0.10% of Si, 1.5%-2.3% of Mn, 0.4%-0.6% of Cr, 0-0.04% of Nb, 0-0.1% of V, 0-0.1% of Ti, 0.004%-0.008% of B, more than or equal to 0.020% of Als, less than or equal to 0.040% of Alt, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 1ppm of H and the balance of Fe and impurity elements. Fine control is adopted in the steelmaking process, the H content is strictly controlled to be lower than 1 ppm, a hydrogen trap is manufactured by adding microalloy elements such as Nb, V and Ti, and the delayed fracture resistance is improved; the air cooling speed of the rolled hot-rolled wire rod is precisely controlled, so that the structure of the hot-rolled wire rod is lath bainite, and high strength is realized by utilizing a medium-carbon bainite structure; the finished wire rod has high strength, high plasticity, excellent low-temperature impact toughness and good delayed fracture resistance.

The invention discloses a preparation method of a lithium-copper composite foil, which comprises the following steps: S1, a lithium-based alloy is selected and rolled to form a lithium alloy foil, and the alloy element in the lithium-based alloy is at least one of magnesium, zinc or aluminum; s2, selecting a piece of copper foil as a supporting framework; and S3, the two pieces of lithium alloy foil and copper foil are stacked together according to the sequence of lithium alloy foil-copper foil-lithium alloy foil, the stacked pieces of lithium alloy foil and copper foil are placed in a roller press to be rolled, metallurgical bonding is formed between the copper foil and the lithium alloy foil, and the lithium-copper composite foil is obtained. The invention adopts release-film-free rolling preparation, aims to solve the problem that lithium metal is easy to stick to a roller due to high viscosity and needs to depend on a high-cost release film in the prior art, simplifies the preparation process of the composite foil, reduces the manufacturing cost, increases the mechanical strength of the lithium-copper alloy foil, reduces the thickness, improves the energy density of the battery, and further improves the product quality and reliability.

The invention belongs to the field of ultra-pure smelting processes of high-performance Cr-Ni-W series high-strength steel, and particularly relates to an ultra-pure smelting method of high-performance Cr-Ni-W shaft steel and the high-performance Cr-Ni-W shaft steel. According to the method, vacuum induction melting is adopted, furnace charge is heated and melted in a magnetic induction mode, the whole melting process is completed in vacuum, and no slag participates in the metallurgy process. The smelting mode has a good effect of removing gas and non-ferrous metal impurities, and alloy elements are basically not burnt. In the vacuum consumable remelting process, inclusion particles float to the surface of a molten pool and are gradually adsorbed by the wall of a crucible under the action of an electric arc, so that the inclusion content in the alloy can be further reduced, and the purity of a cast ingot is improved; and meanwhile, reasonable cooperation of current and voltage, melting speed and cooling is adopted in the melting process, and the component and structure uniformity of Cr-Ni-W series high-strength steel finished product cast ingots is guaranteed.

The invention belongs to the field of profile steel production, and particularly relates to a rolling method of hot-rolled Q450NQR1 weather-resistant H profile steel, which adopts a reversible cogging mill and a universal finishing mill group for rolling: after the cogging mill rolls for 3-5 passes for cogging, a universal continuous rolling mill is adopted for finish rolling 9 continuous rolling, and the arrangement sequence of finish rolling hole patterns is U1-U2-U3-E4-U5-U6-U7-E8-U9; wherein the U3 and the U6 are curved web hole patterns, and the vertical roll is in drum-shaped design. The method has the advantages that one BD cogging mill is used for large-rolling-reduction rolling to crush crystal grains, and then the nine-rack universal continuous rolling mill is used for finish rolling, so that the metal flowing and steel biting conditions are improved. The grain structure is refined through large rolling reduction and low-temperature rolling, the problems that the Q450NQR1 weathering resistant steel is poor in metal fluidity, prone to cracking and the like due to alloy elements are effectively solved, and meanwhile the mechanical property, the size precision and the surface quality of products are guaranteed.

The invention discloses a cold-drawn stainless steel seamless steel tube for fluid transportation and a preparation method thereof, and relates to the technical field of seamless steel tube manufacturing. The steel pipe comprises the following components in percentage by mass: less than or equal to 0.02% of C, 0.4 to 0.6% of Si, 7.5 to 8.0% of Mn, 16.5 to 17.5% of Cr, 3.5 to 4.5% of Ni, 0.01 to 0.05% of Al, 0.25 to 0.30% of N, 0.015 to 0.002% of S, 0.003 to 0.004% of Ca and the balance of Fe, and the mass ratio of Ca to S is controlled to be 1 to 2. Optionally, the alloy also comprises microalloy elements such as Nb, Ti, Mo and the like, and key proportion parameters such as Mn / N, Mn / Ni, Ti / N and the like are limited. According to the steel pipe, through cooperation of a Ca / S inclusion metamorphism mechanism and austenite stable component proportion design, spheroidization and plasticization of inclusion morphology are achieved, and cold-drawing crack sensitivity is remarkably reduced; and meanwhile, a synergistic strengthening system of obdurability and corrosion resistance is constructed, and the service reliability of the material is improved.

The invention provides an aluminum alloy which comprises the following components in percentage by mass: 4.0-5.0% of Zn, 1.2-1.8% of Mg, 0.1-0.3% of Cu, 0.08-0.12% of Zr, 0.02-0.06% of Ti, less than or equal to 0.25% of Fe and the balance of Al, alloy elements containing 4.0-5.0% of Zn, 1.2-1.8% of Mg, 0.1-0.3% of Cu, 0.08-0.12% of Zr, 0.02-0.06% of Ti and less than or equal to 0.25% of Fe and pure aluminum are added into a smelting furnace, smelting is performed at 700-750 DEG C to form a melt, inert gas is introduced or a refining agent is added for refining, gas and inclusions are removed, and the aluminum alloy is obtained. The method utilizes different rotating speeds of upper and lower rollers of a differential rolling mill to generate shearing force, crush coarse tissues, refine grains, increase dislocation density, roll at 480-500 DEG C, reduce deformation resistance, promote dynamic recrystallization, maintain processability, further enhance performance by 60-70% total deformation, perform multi-directional forging after rolling, change strain directions for multiple times, crush grains, homogenize the tissues and eliminate anisotropy, and can be used for manufacturing a high-strength steel plate. The comprehensive performance and the application range of the aluminum alloy profile are improved, and the problems that the structure cannot be refined and the dislocation density cannot be improved in the rolling process are solved.