103 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 provides a regeneration method of an aluminum-silicon alloy, a regenerated silicon-aluminum alloy and an iron-rich phase alloy. The regeneration method comprises the steps that S1, raw materials of the aluminum-silicon alloy are smelted, and a first melt is obtained; s2, an aluminum-manganese intermediate alloy and an aluminum-chromium intermediate alloy are added into the first melt, and a second melt is obtained; the second melt contains Fe element, Mn element and Cr element; s3, refining treatment is conducted on the second melt, and a third melt is obtained; and S4, the third melt is added into a casting mold, mechanical vibration is conducted on the casting mold under the vibration condition so that the third melt can be solidified, and the regenerated aluminum-silicon alloy and the iron-rich phase alloy are obtained. Vibration equipment is used for applying a vibration field to the casting mold, and meanwhile, the proportion of alloy elements and the smelting process are accurately controlled in a matched mode, so that preparation of the low-iron secondary aluminum-silicon alloy is achieved.

The invention discloses a 1500MPa-grade ultrahigh-strength titanium alloy fastener which is obtained by sequentially performing heat treatment, head upsetting and thread rolling forming on ultrahigh-strength titanium alloy, and the ultrahigh-strength titanium alloy comprises the following elements in percentage by mass: 5-6% of Al, 3-4% of Mo, 3-4% of V, 5-6% of Cr, 1-2% of Nb, 2-3% of Zr, not more than 0.5% of Fe and the balance of Ti and inevitable impurities. According to the titanium alloy fastener, it can be guaranteed that the titanium alloy obtains high strength by adding the high Cr element, meanwhile, the machinability of the titanium alloy material is improved by adding the proper content of Mo and Nb elements, forming of the ultrahigh-strength titanium alloy fastener is facilitated, and the titanium alloy fastener is suitable for the technical field of titanium alloy fasteners.

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 discloses an aluminum alloy recovery method, a recovered 6-series aluminum alloy and application. According to the method, the V and Mo elements and the optional Cr element are added into the recycled aluminum alloy and serve as modifiers for modifying the recycled aluminum alloy, meanwhile, the use amount of the V and Mo or the use amount of the V, the Mo and the Cr elements is controlled, the mass ratio of Fe / Mn and the mass ratio of Mg / Si in the recycled aluminum alloy are adjusted and controlled, a coarse primary iron-rich phase in the recycled material can be inhibited, and the recycling rate of the recycled aluminum alloy is increased. And the size of the iron-rich phase is refined, and the distribution uniformity is improved, so that the iron-rich phase is uniformly distributed in the regenerated aluminum alloy matrix, and the area fraction of the iron-rich phase and the width or diameter of the iron-rich phase are relatively small. And the V and Mo modifiers or the V, Mo and Cr modifiers all have a synergistic effect. The regenerated aluminum alloy has excellent mechanical properties after being subjected to subsequent heat treatment.

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.

The invention relates to a cast austenite high manganese wear-resistant steel. The alloy elements of the steel are as follows by mass percentage: C: 0.7-1.3%, Si: 0.3-0.7%, Mn: 7.0-20.0%, Al: 0.03-0.4%, Cr: 0.2-1.0%, Mo: 0.1-0.6%, Ni: 2.0-7.0%, V: 0.05-0.6%, N: 0.01-0.04%, P: ≤0.04%, S: ≤0.02%, and the remainder is iron and unavoidable impurities. The present invention reasonably proportions C, Mn, Ni and Cr elements and alloys them with Mo, V, Nb, N and Re, so that the steel can obtain reliable cast austenite. Because the alloyed material crystal package is densely distributed with fine nucleation carbides such as Mo, V, Nb, N and Re, the grains are refined, and the precipitation of grain boundary carbides can be significantly reduced, thereby improving the mechanical properties. In addition, due to the presence of grain refinement and fine carbide hard points, the stacking fault energy in the process of work hardening can be effectively reduced, thereby improving the work hardening ability and increasing the wear resistance of the product.

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.

The present invention belongs to the field of ceramic scintillators, and specifically discloses a heterovalent ion co-doped garnet transparent scintillating ceramic and a preparation method thereof; the ceramic structure has the following general formula: (R x A 3‑x‑ y A y ')(B 5‑z B' z ) 12 ; Wherein: R represents an activating ion and a sensitizer thereof, including at least one of Ce, Pr, Yb, and Cr elements; A is at least one of the rare earth elements Gd, Y, and Lu; A' represents a divalent cation, including at least one of the elements Mg, Ca, Sr, and Ba; B is at least one of the elements Al, Ga, and Sc; B' represents a tetravalent cation Si; x ranges from 0.0005 to 0.1, y ranges from 0.00005 to 0.01, and z ranges from 0.00005 to 0.01. The present invention uses a heterovalent ion to co-replace the balanced charge, so that the ceramic has the characteristics of high light yield, fast decay, and low afterglow. The ceramic is prepared based on a high-energy ball milling method to prepare powder, which is simple in process and can be mass-produced.

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 discloses a Laves phase-containing layer based on a control rod guide tube Cr coating and a preparation method of the Laves phase-containing layer, and relates to the technical field of control rod guide tube Cr coatings, the Laves phase-containing layer comprises a Laves phase-containing layer and a pure Cr coating, and the Laves phase-containing layer comprises at least two of Fe, Cr and Zr elements. The method comprises the following steps: firstly, pre-treating a zirconium alloy plate, introducing argon into a vacuum chamber, putting a base material and a target material into the vacuum chamber, adjusting parameters of high-power pulse magnetron sputtering, depositing Fe and Cr element atoms on the surface of the base material to form a Laves phase-containing layer, keeping an inert gas environment, replacing the Cr target material, depositing Cr atoms on the surface of the Laves phase-containing layer, and forming a Cr coating; diffusion between Zr and Cr elements is reduced through the Laves phase, the high-temperature oxidation resistance of the Cr coating of the control rod guide tube is improved, and the survival time of the control rod guide tube is prolonged.

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 present application relates to the field of weathering steel materials, and in particular to a 700MPa grade hot-rolled high-strength high-weathering steel and a preparation method and application thereof; the chemical composition of the hot-rolled high-strength high-weathering steel comprises, by mass fraction, C: 0.043% to 0.048%, Si: 0.51% to 0.59%, Mn: 0.61% to 0.68%, P: 0.041% to 0.049%, S: 0.0031% to 0.0038%, Al: 0.071% to 0.079%, Ti: 0.092% to 0.099%, Cu: 0.251% to 0.259%, Cr: 1 .81%~1.98%, N: 0.0031%~0.0034%, and the rest are Fe and unavoidable impurities; adopt micro-alloying design with low C content, low Mn content and high Ti content to improve the overall strength of high weathering steel, reduce the deformation resistance during rolling process, and have good rolling stability. Composite weathering resistance design is carried out for Si, P, Cu and Cr elements to give full play to the contribution of cheap weathering elements such as Si and P to weathering resistance and solid solution strengthening, and then utilize Cu to reduce the adverse effects of chromium carbide on weather resistance and toughness, so as to achieve simultaneous improvement of weather resistance and strength and toughness, while also reducing rolling difficulty and alloy cost.

The invention discloses a high-toughness and corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy and a preparation method thereof, and belongs to the technical field of copper alloys for extreme working conditions. The alloy comprises the following components in percentage by atomic concentration: 44.00 to 50.00 at.% of a Cu element, 17.00 to 20.00 at.% of an Ni element, 17.00 to 20.00 at.% of a Co element, 7.00 to 10.00 at.% of a Cr element, 0 to 8.00 at.% of an Al element, and 0 to 3.00 at.% of a Ti element. Through simple smelting and casting, cold rolling and high-temperature short-time normalizing processes, the organization structure of the alloy can be regulated and controlled, and the prepared heterogeneous CuNiCoCr-based multi-component alloy has high strength, toughness and corrosion resistance.

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.