77 results about "Cr element" patented technology

The invention relates to the technical field of secondary aluminum-silicon alloys, in particular to a preparation method of a heat-treatment-free secondary aluminum-silicon alloy. An Mn element and a Cr element are adopted for conducting iron-rich phase modification on the iron-containing secondary aluminum-silicon alloy, and the secondary aluminum-silicon alloy comprises, by mass, 10.0%-12.0% of Si, 1.0%-3.0% of Cu, 0.8%-1.1% of Fe, 0.5%-3.0% of Cr, 0.1%-2.0% of Mn, smaller than 0.30% of Mg, smaller than 2.0% of Zn, smaller than or equal to 0.18% of inevitable impurities and the balance aluminum. The composite modifier is composed of an intermediate alloy containing Mn and Cr elements, the mass ratio of the Mn element to the Cr element in an alloy melt is 0.1-1.5, and the ratio of the mass sum of the Mn element and the Cr element in the alloy melt to the mass of the Fe element is 2.8. By adding the composite modifier, the morphology of the iron-rich phase in the secondary aluminum-silicon alloy is effectively modified, and meanwhile, the eutectic Si phase is regulated and controlled, so that the purposes of refining the alloy structure and improving the mechanical property of the material are achieved.

The invention relates to the technical field of high-entropy alloys, and discloses a high-entropy alloy with high mechanical property and high corrosion resistance and a preparation method thereof, the high-entropy alloy comprises Fe, Cr, Ni, Al and Si, the atomic ratio of Fe to Cr to Ni to Al to Si is 2: x: 1: 0.2: 0.3, and x is more than or equal to 1.22 and less than or equal to 1.26. Elementary substances corresponding to corresponding elements in the high-entropy alloy are used as raw materials, and the high-entropy alloy is obtained through smelting. The high-entropy alloy has excellent mechanical properties and corrosion resistance and is low in cost, no expensive Co element is added, Fe and Cr elements with relatively low cost are added, and the production cost is reduced.

The invention discloses a high-temperature high-strength heat-resistant aluminum alloy which is characterized in that Al-6% of Cu-1. 5% of Zn-0. 5% of Mg is taken as a matrix, Mn and Cr elements are added, a target alloy is prepared by using a medium-frequency induction heating device, and after casting and machining, a JINDUN Jinton heat treatment device is adopted to carry out T6 process treatment on an aluminum alloy cast ingot.

The invention relates to an aluminum alloy and a preparation method thereof.The preparation method comprises the following steps that an aluminum alloy ingot is sequentially subjected to first-time forward extrusion treatment, annealing treatment and second-time forward extrusion treatment, and the aluminum alloy is obtained; wherein the preheating temperature of the second-time forward extrusion treatment is higher than that of the first-time forward extrusion treatment, and the extrusion speed of the second-time forward extrusion treatment is higher than that of the first-time forward extrusion treatment. According to the preparation method, the average grain size of the aluminum alloy can be refined to be 100 microns or below, the strength of the aluminum alloy is effectively improved, and the preparation method has universality and is particularly suitable for preparing the 6-series aluminum alloy which is high in strength and low in Mn and Cr element content.

The invention provides a high-entropy reinforced gold-based coating as well as a preparation method and application thereof, and relates to the technical field of conductive lubricating materials. The invention provides a high-entropy strengthened gold-based coating. The high-entropy strengthened gold-based coating comprises a Ni transition layer and an Au-FeCoNiCr composite layer, wherein the Ni transition layer and the Au-FeCoNiCr composite layer are sequentially arranged on a copper alloy base material in a stacked mode. The face-centered cubic FeCoNiCr high-entropy alloy formed by Fe, Co, Ni and Cr elements which are obvious in solid solution strengthening of the Au coating and similar in relative atomic mass serves as a doping phase of the gold-based conductive lubricating coating, the grain refinement effect of the coating can be effectively improved, meanwhile, a solid solution structure is formed, and the strength of the coating is enhanced; and moreover, by doping FeCoNiCr, the residual stress of the coating is reduced, the nano hardness and binding force of the coating are improved, and the frictional wear performance of the coating is improved. The high-entropy strengthened gold-based coating provided by the invention has high conductivity and high lubricating property, and is low in cost.

The invention relates to the technical field of high-temperature alloy connection, and provides cobalt-based high-temperature alloy brazing filler metal and a preparation method and a welding method thereof, and the brazing filler metal comprises the following chemical components in percentage by mass: 7-13% of Ni, 10-20% of Cr, 0.01-3% of Ta, 0.01-0.3% of Ti, 8-14% of W, 1-3% of B, 0.01-0.4% of Zr, 0.1-0.5% of C and the balance of Co. According to the cobalt-based high-temperature alloy brazing filler metal, the Ni element is added to stabilize the austenite structure, and the plasticity of a weld joint is improved; in addition, by reducing the content of the Cr element and increasing the content of the W element, the proportion of the Cr element and the W element is changed, so that the obdurability of the weld joint is improved, the strength of the weld joint can be further improved by introducing the Ta element, the Ta element and the C element can form a TaC-phase carbide, in addition, the B element and the C element are adopted as melting reduction elements, and therefore the welding quality of the weld joint is improved. The melting point of the brazing filler metal can be reduced; the wettability of the brazing filler metal is improved.

This invention discloses a high-elongation aluminum alloy for lightweight automotive components and its preparation method, relating to the field of aluminum alloy material technology. It features a hierarchical porous structure with surface micron-sized closed pores and a core nano-sized through-pore. The Ti and Mn elements synergistically form an Al-Ti-Mn martensitic phase transformation core region with Al, and the Cr element precisely controls the martensitic phase transformation initiation temperature to room temperature, ensuring stable triggering of the austenite-to-martensitic phase transformation and energy absorption during room-temperature collisions. This invention achieves initial impact buffering and gradual collapse energy absorption through a hierarchical porous structure with surface micron-sized closed pores and a core nano-sized through-pore. This dual energy absorption mechanism significantly improves the material's strength-ductility product, far exceeding that of traditional aluminum alloys.

The invention provides steel for a 400MPa-grade high-manganese non-magnetic reinforcing steel bar and a production method. The steel comprises the following components: 0.15-0.35% of C, 0.20-0.40% of Si, 18-28% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.05-0.10% of V, 2.0-4.0% of Al, 0.01-0.02% of N and the balance of Fe and inevitable impurity elements, and 4.2 < = L = 1.5 * [C] + 0.20 * [Mn] + 10.0 * [N] < = 5.8. Compared with the prior art, the components are adopted, steel making and steel rolling processes are combined, an austenite structure is formed at the room temperature, the magnetic conductivity is smaller than or equal to 1.05, ReL is larger than or equal to 400 MPa, Rm is larger than or equal to 600 MPa, A is larger than or equal to 30%, and the technical requirements of key projects for the mechanical property of the non-magnetic steel bar can be met. The coating does not contain Cr element and is low in cost.

Provided are a Cr-Ti-N alloy material, a Cr-Ti-N alloy film, a Cr-Ti-N alloy coating, an alloy film product, and a use. The Cr-Ti-N alloy material comprises a Cr element, a Ti element, and an N element. In the Cr-Ti-N alloy material, the atomic ratio of the Cr element, the Ti element, and the N element is x:y:z, wherein 27.8≤x≤62.9, 18.4≤y≤37.0, and 13.8≤z≤35.2. The Cr-Ti-N alloy material has both excellent corrosion resistance and high hardness.

Provided are a Cr-Ti-N alloy material, a Cr-Ti-N alloy film, a Cr-Ti-N alloy coating, an alloy film product, and a use. The Cr-Ti-N alloy material comprises a Cr element, a Ti element, and an N element. In the Cr-Ti-N alloy material, the atomic ratio of the Cr element, the Ti element, and the N element is x:y:z, wherein 27.8≤x≤62.9, 18.4≤y≤37.0, and 13.8≤z≤35.2. The Cr-Ti-N alloy material has both excellent corrosion resistance and high hardness.

The invention relates to a 45 steel plate for punch forming of a high-strength chain wheel and a preparation method of the 45 steel plate. The steel comprises the following chemical components: 0.42%-0.48% of C, 0.20%-0.30% of Si, 0.55%-0.65% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.015%-0.025% of V, 0.15%-0.20% of Cr and the balance of Fe and impurities. The metallographic structure of the finished steel plate is a ferrite and pearlite mixed structure, and the volume fraction ratio of ferrite to pearlite is (45%-55%): (55%-45%); and the grain size grade is 8.0-10.0 grade. On the basis of traditional 45 steel components, a small amount of V and Cr elements are added, a specific controlled rolling and controlled cooling process is combined, under the condition that follow-up heat treatment is not carried out, hot-rolled strip steel which is small in grain size, uniform in structure and excellent in obdurability matching is directly obtained, and the finished steel product is particularly suitable for punch forming of chain wheels.

The invention discloses a high-strength wind power main shaft bearing and a processing method thereof, and the method comprises the following steps: S1, raw material preparation: a, blank selection: selecting high-strength alloy structural steel containing Cr, Ni and Mo elements as a bearing blank, wherein the content of the Cr element is 1.5%-2.0%, the content of the Ni element is 0.8%-1.2%, and the content of the Mo element is 0.2%-0.5%; high-strength alloy structural steel containing Cr, Ni and Mo is selected as a blank, the Cr element is used for improving abrasion resistance and hardenability, the Ni element is used for enhancing toughness and fatigue resistance, the Mo element is used for improving high-temperature strength and tempering-resistant stability, the performance bottleneck of a traditional material is broken through from the raw material level, meanwhile, through homogenizing annealing in the blank pretreatment stage, the hardness of the blank is improved, and the hardness of the blank is improved. The structure segregation in the blank is effectively eliminated, the uniformity of material components and structures is guaranteed, a stable material foundation is laid for subsequent machining procedures, and local stress concentration and early failure caused by uneven materials are avoided.

The application provides a kind of straw returning to field with self-hardening broken blade steel and its preparation method, and belongs to the field of steel preparation.The broken blade steel chemical composition includes C, Si, Mn, Cr, Ni, Mo, Nb, Ti, V, B and Fe; wherein, the content of C is 0.30%~0.55%, the content of Si is 0.15%~0.25%, the content of Mn is 0.45%~0.75%, the content of Cr is 0.85%~2.0%, the content of Ni is 3.0%~4.5%, the content of Mo is 0.4%~1.2%, the content of Nb is 0.01%~0.060%, the content of Ti is 0.015%~0.03%, the content of V is 0.3%~0.9%, and the content of B is 0.002%~0.005% by mass fraction.By limiting the addition of C, Si and Mn to improve the tensile strength of steel, adding Ti and Nb elements for fine-grain strengthening and second phase particle precipitation strengthening, adding B and Cr elements to improve the hardenability of steel, adding Ni to improve the toughness of steel, adding Mo element to improve the ability of anti-tempering brittleness, and adding V element to ensure hardenability at local high temperature, the metallographic structure of the steel is obtained in the form of lath martensite, thereby improving the performance of the broken blade.

The invention provides a copper alloy pipe and a preparation method thereof. The copper alloy pipe is prepared from the following elements in percentage by mass: 0.5 to 2.1 percent of Al element, 0.5 to 2.0 percent of Si element, 0.5 to 2.0 percent of Ni element, 0.05 to 0.08 percent of Ce element, 0.05 to 0.1 percent of Cr element, 0.05 to 0.08 percent of V element, less than or equal to 0.02 percent of inevitable impurities and the balance of Cu element, an alpha phase and a beta phase exist in the copper alloy pipe, and the mass ratio of the alpha phase to the beta phase is (40-80): (20-60). The copper alloy pipe can give consideration to high strength, high conductivity and corrosion resistance, directional regulation and control of the double-phase proportion can be achieved by controlling the mass ratio of the alpha phase to the beta phase, optimization and adjustment are conducted according to the strength and conductivity requirements, and then the copper alloy pipe can be better applied to sea optical cable connecting pieces, underwater equipment connectors and other use scenes.

The invention provides an aluminum alloy plate and a preparation method thereof. The preparation method comprises the steps that smelting, casting, soaking and heating integrated treatment, hot rolling and cold rolling are sequentially conducted after ingredients of an aluminum alloy plate are prepared, and a cold-rolled coiled material is obtained; the aluminum alloy plate comprises the following components in percentage by mass: 0.6-1.3% of Si element, less than or equal to 0.5% of Fe element, 0.5-1.1% of Cu element, less than or equal to 1.0% of Mn element, 0.6-1.2% of Mg element, less than or equal to 0.25% of Cr element, less than or equal to 0.7% of Zn element, less than or equal to 0.2% of Ti element, less than or equal to 0.2% of Zr element and the balance of Al element. The cold-rolled coiled material is sequentially subjected to solid solution treatment, quenching (multi-stage cooling), straightening and pre-aging, and a first finished coiled material is obtained; and the first finished coiled material is subjected to differential temperature heating artificial aging treatment, and the aluminum alloy plate is obtained. The production efficiency of the preparation method is high, and the comprehensive performance of the obtained aluminum alloy plate is good.

The present invention provides an aluminum alloy multi-layer composite plate, a preparation method thereof and an application. The aluminum alloy multi-layer composite plate includes a first layer, a second layer, a third layer and a fourth layer stacked in sequence; wherein, the first layer and the third layer are both 3XXX series aluminum alloys, the second layer is a 6XXX series aluminum alloy, and the fourth layer is a 4XXX series aluminum alloy. By mass percentage, the 6XXX series aluminum alloy includes the following elements: Si element, Mg element, Cu element, Zn element, Mn element, Zr element, Cr element, Ti element, Fe element and Al element. Arranging the 6XXX series aluminum alloy between the 3XXX series aluminum alloys helps to prevent the high-temperature volatilization of the Mg element in the 6XXX series aluminum alloy, thereby helping to improve the high-temperature resistance of the aluminum alloy multi-layer composite plate. The aluminum alloy multi-layer composite plate of the present application not only has high yield strength, tensile strength and elongation, but also has a low cost.

The invention provides a multi-principal-element alloy abrasion-resistant coating as well as a preparation method and application of the multi-principal-element alloy abrasion-resistant coating. The multi-principal-element alloy abrasion-resistant coating comprises a hard phase and an FCC soft phase, the hard phase comprises MC, M7C3 type core-shell structure carbides and phase intermetallic compounds, and the FCC soft phase comprises Cr2Ni3 and Fe3Ni2; the core of the M7C3 type core-shell structure carbide is made of FeCoNi, and the shell of the M7C3 type core-shell structure carbide contains C and Cr elements. The multi-principal-element alloy abrasion-resistant coating is prepared from a composite powder material containing 55 wt%-75 wt% of iron-based amorphous powder and 25 wt%-45 wt% of nickel-based alloy powder through a laser cladding technology. The multi-principal-element alloy abrasion-resistant coating provided by the invention is uniform and compact in structure, free of obvious defects, good in corrosion capacity and relatively low in abrasion rate in a seawater environment.

The invention relates to the technical field of continuous casting production of gear steel, and discloses a double-section electromagnetic stirring process for segregation optimization of a CrMnMo series gear steel casting blank. Comprising the steps of S1, a process preparation stage, S2, a crystallizer electromagnetic stirring process (segregation inhibition in a primary solidification stage) in the first stage, S3, a tail end electromagnetic stirring process (solidification tail end segregation correction) in the second stage, S4, double-stage stirring cooperative regulation and control key points, S5, a casting blank subsequent slow cooling cooperative process, S6, process monitoring and dynamic adjustment and S7, process verification and optimization. Through precise division of labor and cooperative regulation and control of double-section electromagnetic stirring, uneven growth of dendritic crystal arms is inhibited in the primary solidification stage, correction elements at the solidification tail end are enriched, the C, Mn and Cr element range of the section of a casting blank is smaller than or equal to 0.040%, center porosity is achieved, general porosity is smaller than or equal to 2.0 levels, ingot segregation is smaller than or equal to 1.5 levels, and the industry pain point of serious segregation in a traditional process is effectively solved.

This invention discloses a titanium alloy plate for marine engineering and its preparation method, belonging to the field of titanium alloy manufacturing technology. The invention introduces 1.5-2% Cr element into the titanium alloy, synergistically using Mo and Nb to regulate the stability and microstructure evolution of the β phase; employs forging to break the as-cast microstructure and refine the grains; combines 90° reversing hot rolling to break the texture inheritance; and improves the uniformity of the plate's thickness and suppresses edge cracks through cladding and stacking rolling; finally, a matched solution aging treatment is performed to achieve a synergistic improvement in strength, toughness, and microstructure uniformity. The resulting plate has a uniform microstructure, significantly weakened anisotropy, and excellent balanced mechanical properties, meeting the performance requirements of marine load-bearing components. It is suitable for deep-sea equipment, ships, and offshore platform structural components, with broad application prospects.

The present application relates to a kind of manganese cobalt spinel coating and its preparation method and application, belong to solid oxide fuel cell material technical field.The manganese cobalt spinel coating described in the present application is coated on the substrate containing Cr element, including the binding layer on substrate and the structural layer on the binding layer;The binding layer includes the following components: manganese cobalt spinel material, MnCr2O4, Cr2O3;The structural layer is manganese cobalt spinel material;The chemical formula of the manganese cobalt spinel material is Mn 1+ x Co 2‑x O4, wherein, -1

The invention discloses a metal bipolar plate for a fuel cell and a preparation method thereof.The metal bipolar plate comprises a metal substrate and a functional layer covering the metal substrate, the metal substrate is made of 316L stainless steel, and the functional layer sequentially comprises a sputtering layer, a transition layer and a ternary composite layer from the bottom layer close to the metal substrate to the surface layer, the sputtering layer is composed of a Cr element, the transition layer is composed of two elements of Cr and Ti, the ternary composite layer is composed of three elements of Cr, Ti and C. The preparation technology of the functional layer is a combination of a magnetron sputtering technology and a chemical vapor deposition technology. The metal bipolar plate prepared by the method has excellent conductivity and corrosion resistance.

The invention provides a stainless steel material, a product and a vehicle, and the stainless steel material comprises the following chemical components in percentage by mass: 18.2% < = Cr < = 21.2%, and 0.13% < N < = 0.18%. According to the stainless steel material disclosed by the invention, through the component design containing the TRIP effect, particularly, the content of the alloy element N is greatly improved, and the Cr element with the specific content is added, so that a passive film on the surface of the stainless steel material can be modified, the content of a Cr2O3 oxide film with protection is greatly improved due to N enrichment, and the crevice corrosion resistance of the material is greatly improved; by means of the method, complex deep drawing of a high-pressure oil tank of a new energy automobile can be met, crevice corrosion perforation oil leakage under the severe corrosion environment of the bottom of the automobile can be met, traditional 304 stainless steel is replaced, higher service safety is achieved, and driving and riding safety is improved.

The invention relates to low-cost high-performance Sb-Nb-Ti microalloyed steel for an ocean platform and a preparation method of the low-cost high-performance Sb-Nb-Ti microalloyed steel, and belongs to the field of weathering resistant steel design and manufacturing, the steel comprises the following chemical components in percentage by weight (wt.%): 0.06 to 0.08 percent of C, 0.25 to 0.35 percent of Si, 1.45 to 1.55 percent of Mn, 0.20 to 0.30 percent of Cu, 0.75 to 0.85 percent of Ni, 0.01 to 0.03 percent of Ti, 0.01 to 0.03 percent of Nb, 0.01 to 0.05 percent of Al, 0.15 to 0.25 percent of Sb and the balance of Fe and inevitable impurities, the preparation method sequentially comprises the steps of converter smelting, external refining, slab casting, billet heating, controlled rolling, controlled cooling and air cooling. The rolling process comprises the following steps: sequentially rolling a heated steel billet in an austenite recrystallization region, rolling an austenite non-recrystallization region and rolling an austenite and ferrite two-phase region; according to the steel plate, the chemical components are simple, the Cr element is not added, the contents of Cu and Ni are controlled at a low level, a simple TMCP process is adopted to replace a complex TMCP + tempering or TMCP + hardening and tempering process, it is guaranteed that the steel plate has good obdurability matching, low-temperature toughness and welding performance, meanwhile, the production cost of the steel plate is reduced, and the production efficiency is improved.

The invention discloses a high-strength corrosion-resistant aluminum alloy for an automobile battery tray and a preparation method thereof.According to the high-strength corrosion-resistant aluminum alloy for the automobile battery tray and the preparation method thereof, by adding the La element in a specific proportion and regulating and controlling the content of Si and Mg, the corrosion resistance of the material is remarkably improved on the premise that the strength is not sacrificed, in addition, addition of the Cr element is avoided, meanwhile, the La element is introduced, the plastic deformation capacity of the alloy is effectively improved, and the service life of the alloy is prolonged. And an ultrasonic treatment process is combined to promote the uniformity of the melt, so that the complex-section profile is easier to extrude and form, the production efficiency is favorably improved, and the defects such as dragging and breaking are not easy to occur. The La element is added, the morphology of Si particles is converted from a continuous sheet shape to a discontinuous short rod shape, extension of corrosion along a grain boundary is effectively hindered, and the alloy has remarkable mechanical performance and corrosion resistance by combining the synergistic effect of a specific refining agent, components and the process.

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a preparation method of an AB2 type titanium-manganese series hydrogen storage alloy. According to the method, at least one AB-type intermediate alloy is prepared from an elemental raw material of at least one A-side metal element and an elemental raw material of at least one B-side metal element of the AB2-type titanium-manganese hydrogen storage alloy, the A-side metal element comprises a Ti element and / or a Zr element, and the B-side metal element comprises a Cr element and / or an Mn element; and preparing the AB2 type titanium-manganese hydrogen storage alloy from the at least one AB type intermediate alloy and other metal raw materials for preparing the AB2 type titanium-manganese hydrogen storage alloy. According to the preparation method of the AB2 type titanium-manganese series hydrogen storage alloy, the metal burning loss can be remarkably reduced, and meanwhile the hydrogen storage performance of the AB2 type titanium-manganese series hydrogen storage alloy is improved.

The invention belongs to the technical field of alloy materials, and particularly relates to a high-strength erosion-corrosion-resistant copper-nickel alloy and a preparation method and application thereof. The high-strength erosion-corrosion-resistant copper-nickel alloy comprises 26%-29% of Ni element, 1%-2% of Fe element, 2%-4% of Mn element, 1.5%-2.5% of Al element, 0.3%-0.5% of Cr element, 0.6%-1% of Nb element and the balance Cu element and inevitable impurities. The copper-nickel alloy material obtained by optimizing the types and contents of elements in the nickel-copper alloy and optimizing the matched thermomechanical treatment process and aging process has excellent comprehensive performance, and particularly has relatively high strength and high-flow-rate sediment seawater erosion corrosion resistance.

The invention provides a low-cost titanium alloy high-efficiency high-toughness welding method, which comprises the steps of welding wire design, preparation before welding, welding process and post-welding treatment, and the welding wire design comprises the following steps: controlling the contents of Al and V elements to be close to the level of a base metal to realize joint strength matching; the proportion matching of Fe and Cr elements is controlled, and the strength and the toughness are both considered; the welding wire contains B elements or TiB2 particles or TiC particles, and crack propagation inhibition is achieved. According to the method, the structure evolution of a heat affected zone can be effectively regulated and controlled while the welding defects are restrained, the joint obdurability matching is improved, and good process adaptability and economical efficiency are achieved.

The application discloses a preparation process of B-Zr doped cobalt-based alloy powder and coating, and the alloy powder is composed of the following components with mass percentage: 90-95% of Stellite6, 1-5% of B and 1-5% of Zr. By introducing appropriate amounts of B and Zr elements into the Stellite6 alloy powder, the Zr and B elements synergistically alleviate the brittle boride to inhibit cracks, and synergistically form fine and dispersed ZrB2 and other stable high-hardness phases, promote the refinement of the structure, improve the hardness of the coating, and prevent B from forming a continuous network of brittle phases. The addition of the B element can also generate intermetallic compounds with Co elements and Cr elements, which have high hardness and high wear resistance, so that the overall strengthening layer hardness is improved. The finally formed high-hardness strengthening layer has a thickness of more than 0.5 mm and no cracks are generated. The hardness of the strengthening layer is more than 1100 HV, and the hardness of the strengthening layer can be more than 2-4 times of the substrate.

The present invention discloses a kind of welding material, welding material, application and preparation method, wherein welding material, its raw material composition includes, wt%:Si:1‑3%, Mg:1.2‑3.2%, Zn:1‑3.6%, Cu:0.6‑1.6%, Mn:0.5‑0.8%, Cr:0.2‑0.45%, Ti:0.1‑0.25%, Zr:0.05‑0.1%, Sc:0.05‑0.1%, Fe<0.2%, remainder is Al and inevitable impurities. The present invention reduces the precipitation enthalpy of nanoscale strengthening phase by the regulation of Zn, Cu, Mg, Si elemental content, so as to improve the bake hardening effect of weld, to make up for the weld excessive softening problem existing due to the dissolution of nanoscale precipitated phase. In addition, Fe-containing brittle phase characteristics are improved in weld by Mn, Cr element addition, and weld hot crack tendency is reduced in combination with grain refining elements such as Zr, Sc, Ti, so as to further improve weld toughness.

The invention relates to an aluminum alloy plate for an attenuation-resistant ultrathin tank cover material, which comprises the following elements in percentage by mass: 0.07-0.15% of Si element, 0.07-0.15% of Al element, 0.07-0.15% of Al element, 0.07-0.15% of Al element and the balance of aluminum element. 0.15 to 0.3 percent of Fe element; 0.07%-0.15% of a Cu element; 0.3 to 0.5 percent of Mn element; 4.75%-4.95% of an Mg element; 0.01%-0.03% of a Ti element; 0.02 to 0.10 percent of Cr element; 0.01%-0.20% of a Zn element; the total content of the inevitable impurities is smaller than or equal to 0.15%; the sum of the mass of the Mn element and the mass of the Cr element in the aluminum alloy plate for the tank cover material is 0.40-0.55%. After the 0.200-0.208 mm ultra-thin 202 series two-piece can easy-open cover prepared from the aluminum alloy is subjected to 90 DEG C / 40 min water boiling aging attenuation, the pressure resistance is larger than or equal to 700 KPa, and the attenuation amplitude is smaller than or equal to 30 KPa.