92 results about "Hydrogen embrittlement" patented technology

A method for manufacturing high-strength, hydrogen-embrittlement-resistant bolts based on microsphere shot peening, and the bolts themselves, are disclosed. The manufacturing method includes: S1, cold heading and thread rolling of alloy structural steel billets to obtain bolt forming parts; S2, surface cleaning of the bolt forming parts, followed by overall surface peening with microspheres driven by high-pressure air; after overall peening, targeted strengthening peening treatment is performed on stress concentration areas such as thread roots, undercut grooves, and flange transition corners to obtain reinforced bolt parts; S3, the reinforced bolt parts are cleaned, dried, and phosphated to obtain finished bolt parts. This design, through a "overall + targeted" composite microsphere shot peening strategy, introduces a uniform residual compressive stress field and a micron-level fine-grained plastic deformation layer on the bolt surface, forming a thicker strengthening layer in stress concentration areas, significantly improving the fatigue strength and delayed fracture resistance of high-strength bolts, while ensuring uniform surface roughness and stable assembly friction coefficient.

This invention relates to a gradient surface modification method for hydrogen-resistant thick-walled pipes used in hydrogen-powered vehicles, comprising the following steps: S1: pre-treating the thick-walled metal pipe wall; S2: depositing a bottom layer on the pre-treated pipe wall surface, wherein the bottom layer is a CrN and TiN composite layer; this invention uses a Si3N4 / SiCN composite intermediate layer as the main hydrogen barrier layer, utilizing the extremely low hydrogen diffusion coefficient of Si3N4 and its dense amorphous network structure to effectively block the penetration of hydrogen atoms into the metal matrix. Simultaneously, the DLC surface layer serves as the first line of defense, utilizing its high hardness and low friction coefficient to resist the erosion and wear of high-pressure hydrogen gas flow, extending the service life of the barrier layer.

The present application relates to a galvanized steel sheet and a manufacturing method therefor. According to the present application, it is possible to provide a galvanized steel sheet having high yield strength and excellent resistance to hydrogen embrittlement, and a manufacturing method therefor.

The application discloses a high-pressure quick connector based on precipitation hardening stainless steel and a production process thereof, and belongs to the technical field of materials. In the production process, carbon-coated NbC-Cu functional carbide is added as an additive. The carbon-coated NbC-Cu functional carbide contains a nano copper phase. Through low-temperature solid solution and aging treatment, two kinds of precipitated phases can be generated. One is a B2-NiAl precipitated phase in high-coherent relation with the matrix, and the other is an FCC-Cu precipitated phase in incoherent relation with the matrix. The high-pressure quick connector can generate phase transformation induced plasticity caused by the martensite transformation of austenite in the deformation process, and the FCC-Cu precipitated phase can capture the hydrogen evolution as an effective hydrogen trap to reduce the diffusible hydrogen content in the matrix to the maximum extent, thereby reducing the hydrogen embrittlement sensitivity while ensuring the good mechanical properties of the high-pressure quick connector.

The application provides a kind of anti-hydrogen embrittlement material design method and system based on deep generative model, belongs to material design field.The method first collects the material composition of anti-hydrogen embrittlement material, hydrogen charging process parameters and corresponding hydrogen embrittlement sensitivity index obtained by experiment, constructs experimental data set, and is preprocessed to obtain training data set;Again, based on deep generative model, a component and hydrogen charging process-performance bidirectional mapping model is constructed, including a component and hydrogen charging process to performance bidirectional mapping network and a generation network acting on performance space, and a loss function is constructed, and the component and hydrogen charging process-performance bidirectional mapping model is trained and verified;Preset target performance, based on the component and hydrogen charging process-performance bidirectional mapping model after training, the composition and hydrogen charging process parameters of anti-hydrogen embrittlement material are designed reversely.The application realizes the composition reverse design of anti-hydrogen embrittlement material from target performance, shortens the material development cycle, and improves the anti-hydrogen embrittlement performance of material.

One aspect of the present invention is to provide a coated steel sheet for hot forming with excellent resistance to hydrogen embrittlement, hot-formed components, and a method for manufacturing the same.

An austenitic stainless steel material that has high strength and has excellent hydrogen embrittlement resistance in a high-pressure hydrogen gas environment is provided. An austenitic stainless steel material of the present disclosure has a chemical composition consisting of, in mass%, C: 0.100% or less, Si: 1.000% or less, Mn: 8.00 to 20.00%, P: 0.050% or less, S: 0.0050% or less, Cr: 18.00 to 30.00%, Ni: 10.00 to 25.00%, N: more than 0.350 to less than 0.700%, V: 0.010 to 0.200%, Nb: 0.010 to 0.300%, Al: 0.200% or less, and O: 0.0100% or less, with the balance being Fe and impurities, in which Fn1 defined by Formula (1) in the description is 18.0 or more when the content of Ni is less than 17.00% and is 22.0 or more when the content of Ni is 17.00% or more. In the steel material, a number density of (Cr, Nb) composite precipitates having an equivalent circular diameter of 50 to 500 nm is 1.00 / µm2 or more.

The application provides an anti-hydrogen embrittlement stainless steel and a preparation method and application thereof, and relates to the technical field of special stainless steel.The anti-hydrogen embrittlement stainless steel provided by the application contains the following elements in percentage by mass: 0.05-0.08% of C, 7-9% of Mn, 13-16% of Cr, 8-10% of Ni, 0.8-1% of Cu, 2-3% of Co, 0.2-0.4% of N, 1-2% of RE, 0.01-0.05% of impurities and the balance of Fe; the RE contains at least one of La, Ce and Y. The multiple metal elements and non-metal elements are used to cooperate and jointly act, the Mn and N can stabilize the austenite structure, can improve the structural strength and toughness of the anti-hydrogen embrittlement stainless steel, and can make the stainless steel have the anti-hydrogen embrittlement capability, and the anti-delayed fracture performance is improved.

The application discloses a flexible capillary hydrogen storage device and a manufacturing method thereof, and is characterized in that device components include a framework, a flexible hydrogen storage capillary and a high-pressure-resistant metal connecting piece; wherein both ends of the flexible hydrogen storage capillary are in an open state. The device manufacturing steps include: flexible hydrogen storage capillary single-pipe drawing, flexible hydrogen storage capillary arrangement and flexible hydrogen storage capillary end sealing. Compared with the prior art, the application can realize higher hydrogen storage pressure and higher mass hydrogen storage density, and the device has the advantages of flexible structure, higher safety, no hydrogen embrittlement and the like.

The present application relates to a cold-rolled steel sheet and a method for manufacturing same. According to the present application, it is possible to provide a high strength cold-rolled steel sheet having excellent hydrogen embrittlement properties, and a method for manufacturing same.

This invention provides a composite hydrogen-barrier coating for high-strength steel and its preparation method. Belonging to the field of surface modification of metallic materials, the high-strength steel has a hardness of HV300-HV600, a tensile strength of 900-1200 MPa, a maximum thermal expansion coefficient of (8-20)×10⁻⁶ / K, and an elastic modulus between 100-200 GPa. The composite hydrogen-barrier coating consists of a transition layer and a hydrogen-barrier layer. The transition layer is composed of Al, Cr, and Zr, with each element having a molar ratio of not less than 30%. The hydrogen-barrier layer is composed of Al, Cr, Zr oxides and some unoxidized metal. Both the transition layer and the hydrogen-barrier layer have an amorphous structure. This coating utilizes the difference in binding energy between Al, Cr, and Zr and hydrogen to construct a material system with a tortuous hydrogen diffusion path and a high hydrogen diffusion barrier. Using magnetron sputtering technology, an amorphous (AlCrZr)O coating can be prepared on the surface of high-strength steel, effectively blocking and capturing hydrogen atoms, significantly improving the material's resistance to hydrogen embrittlement.

The application discloses a method for improving hydrogen embrittlement resistance of iron-based superalloy by grain boundary regulation and application thereof. The application uses iron-based superalloy powder containing trace elements as raw material, and regulates hydrogen embrittlement resistance of the iron-based superalloy by laser powder bed melting process combined with vacuum sealing tube treatment and five-step heat treatment process. The first three steps are high-temperature heat treatment, and the last two steps are low-temperature heat treatment. The hydrogen embrittlement resistant iron-based superalloy obtained by the process has high strength and plasticity matching at room temperature and 600 DEG C, and has small elongation loss after hydrogen charging, and the hydrogen embrittlement resistance is significantly better than that of Inconel 718 nickel-based alloy. The process regulates the grain boundary type and element distribution in the alloy through multi-stage synergistic regulation, not only significantly improves the comprehensive mechanical properties of the material, but also endows the material with excellent hydrogen embrittlement resistance, can effectively meet the strict requirements of liquid hydrogen rocket engine nozzle and key parts of aviation system on high reliability, long service life and extreme environment adaptability, and has wide application prospect.

A high-pressure tank which suppresses the effect of hydrogen embrittlement of metal, ensures the storage amount of gas, and reduces the weight, stores a mixed gas containing natural gas and hydrogen, which contains more than 2% of hydrogen in terms of volume ratio, in the inside of a tank main body, the tank main body has a cylindrical portion extending in a first direction, and a dome portion connected to both ends of the first direction of the cylindrical portion, the tensile strength TS of a steel material constituting the tank main body is 850 MPa or more, has a structure of 95% or more of tempered martensite in terms of area ratio, carbides of 100 nm or less are dispersed in the metal structure in the form of precipitates, and has a strength of 11250 cycles or more in a crack propagation analysis.

The purpose of one aspect of the present invention is to provide a cold-rolled steel sheet and a manufacturing method therefor. The purpose of one preferred aspect of the present invention is to provide an ultra-high-strength cold-rolled steel sheet having excellent hydrogen embrittlement resistance and bendability, and a manufacturing method therefor.

The present application relates to the technical field of sample hydrogen embrittlement test, and particularly relates to a multi-sample hydrogen embrittlement test system and method. The present application provides a multi-sample hydrogen embrittlement test system, which comprises a kettle body assembly, a multi-sample bearing assembly and a gas path regulation assembly. The kettle body assembly has an inner cavity, the multi-sample bearing assembly is arranged in the inner cavity, and the multi-sample bearing assembly is used for fixing multiple pieces of hydrogen-charged metal samples. The gas path regulation assembly is communicated with the inner cavity, and the gas path regulation assembly is used for introducing hydrogen-containing gas into the inner cavity and discharging gas in the inner cavity. The multi-sample hydrogen embrittlement test system can improve test efficiency, and ensure the comparability and consistency of test results.

The invention provides a micro-channel heat exchange device based on high-entropy alloy connection and a preparation method and application of the micro-channel heat exchange device. According to the micro-channel heat exchange device, the connection quality of the joints of all layers of the micro-channel heat exchange device is improved, the tensile strength, the corrosion resistance and the hydrogen embrittlement resistance are improved, and the compactness, the corrosion resistance and the hydrogen embrittlement resistance of the fluid contact surface in the micro-channel heat exchange device are improved; the strength, the corrosion resistance and the hydrogen embrittlement resistance of the micro-channel heat exchange device are integrally improved, so that the micro-channel heat exchange device based on high-entropy alloy connection is suitable for places with high requirements for the space utilization rate and the reliability such as a hydrogen refueling station, and is particularly applied as a micro-channel heat exchanger of a hydrogen cooling system of the hydrogen refueling station.

This invention discloses a method and system for controlling the protective atmosphere and cooling in a vertical furnace to improve the gloss of stainless steel, relating to the field of metal material heat treatment technology. The method is applied to a vertical furnace having a heating section, a soaking section, a slow cooling section, and a rapid cooling section. It includes: introducing a hydrogen-containing first protective atmosphere in the heating and soaking sections; introducing hydrocarbons in the slow cooling section to form a second protective atmosphere to repair the surface of the stainless steel strip; stopping the introduction of the aforementioned atmosphere in the rapid cooling section and switching to the introduction of a non-oxidizing gas for high-speed jet cooling; and adjusting the jet parameters of the non-oxidizing gas in real time according to the steel strip specifications and speed during cooling. This invention also discloses a system for implementing this method. This invention solves the problems of low gloss and unstable quality during stainless steel heat treatment, effectively repairs the chromium-depleted layer on the surface, avoids hydrogen embrittlement, and improves product surface quality and production stability.

This invention belongs to the field of materials testing technology and discloses a device and method for testing the hydrogen content of metallic materials. The testing device includes a reaction vessel and multiple constant-force loading structures. The reaction vessel surrounds a fixed chamber filled with test gas and electrolyte solution. The multiple constant-force loading structures are located in the fixed chamber. Each constant-force loading structure includes a clamp assembly and a loading assembly. The clamp assembly includes a first clamp and a second clamp, with the second clamp having a blank test position. The loading assembly includes a first pull rod, a rotating nut, and an elastic element. Tightening or rotating the nut applies a load to the loaded sample. By precisely controlling the deformation of the elastic element, the load applied to the loaded sample can be ensured to accurately reach a preset value, achieving precise control of the constant load to test the hydrogen embrittlement sensitivity of the sample under different load conditions. The multiple constant-force loading structures can simulate various different load conditions, facilitating simultaneous parallel comparison tests under multiple conditions and improving testing efficiency.

This invention discloses a dynamic control method and system for natural gas hydrogen blending transportation. The method involves collecting multi-source data from natural gas pipelines; processing and performing operational condition correction calculations on the collected multi-source data to construct a multi-dimensional dataset; inputting the multi-dimensional dataset into a preset hydrogen blending ratio calculation model to calculate the target value of the safe hydrogen blending ratio under the current operating conditions; calculating the theoretical hydrogen flow rate setpoint based on the target value of the safe hydrogen blending ratio; dynamically adjusting the opening of the hydrogen injection valve through an adaptive control algorithm to make the measured hydrogen blending ratio approach the target value of the safe hydrogen blending ratio; calculating the hydrogen embrittlement safety index based on the measured hydrogen blending ratio, the target value of the safe hydrogen blending ratio, and the service life of the pipeline; and continuously monitoring and providing feedback to form a closed-loop control system. This system enables precise and safe dynamic adjustment of the hydrogen blending ratio based on the corrosion defect characteristics and service conditions of the natural gas pipeline, thereby improving the safety and efficiency of natural gas hydrogen blending transportation.

The application relates to the technical field of testing devices, and discloses a fastener hydrogen embrittlement testing device, which comprises a testing box, the inner wall of the testing box is provided with a joint plate, the inside of the joint plate is provided with a clamping groove, the outer wall of the joint plate is fixedly connected with a placing plate, the inside of the placing plate is provided with a fastener main body, the inner walls of the two sides of the testing box are fixedly connected with supporting frames, the outer wall of the placing plate is slidably connected with the inner walls of the supporting frames, the inner walls of the supporting frames are fixedly connected with second springs, the outer wall of the placing plate is arranged on the outer wall of the second spring, and the inner wall of the testing box is slidably connected with a moving plate. The moving plate is pulled to move upwards, the inclined block is driven to be separated from the clamping groove, the placing plate is pushed out through the second spring, the fastener is quickly replaced, the placing plate is pushed back to the inner wall of the supporting frame, the first spring rebounds, the inclined block is pushed back to the clamping groove, the stability of the placing plate is ensured through the second spring, and the stability and the testing efficiency during fastener testing are ensured.

The invention belongs to the technical field of hydrogen storage. Specifically, the invention relates to a vanadium-based hydrogen storage alloy material and a vanadium-based hydrogen storage alloy unit body preferably comprising the vanadium-based hydrogen storage alloy material, and further relates to a preparation method of the vanadium-based hydrogen storage alloy unit body and a hydrogen storage device comprising the vanadium-based hydrogen storage alloy unit body. The vanadium-based hydrogen storage alloy unit body comprises vanadium-based hydrogen storage alloy particles with coatings or plating layers on the surfaces; and the nickel-based flexible fiber net coats one or more vanadium-based hydrogen storage alloy particles with coatings or plating layers on the surfaces. According to the vanadium-based hydrogen storage alloy unit body, through the synergistic effect of the coatings or the plating layers located on the surfaces of the vanadium-based hydrogen storage alloy particles and the nickel-based flexible fiber nets wrapping the vanadium-based hydrogen storage alloy particles, the three problems of hydrogen embrittlement, oxidation and pulverization of a vanadium-based hydrogen storage alloy material are solved at the same time; and the stability and safety of hydrogen absorption and desorption circulation of the vanadium-based hydrogen storage alloy material are remarkably improved.

This invention relates to the field of welding materials technology, specifically to a high-strength, corrosion-resistant welding wire for pressure-resistant structures of deep-sea equipment and its preparation process. The chemical composition and mass percentage of the welding wire of this invention are as follows: C≤0.07%, Si≤0.10%, Mn: 5.0%~6.0%, S≤0.005%, P≤0.005%, Cr: 18.0%~19.5%, Ni: 23.0%~28.0%, Mo: 6.0%~7.5%, V: 0.15%~0.35%, N: 0.20%~0.40%, Al: 0.20%~0.50%, with the remainder being Fe and unavoidable impurities. The preparation process includes vacuum induction melting, electroslag remelting refining, multi-pass hot rolling of wire rod, and multi-pass cold drawing. Employing ultra-low C, low Si, and extremely low impurities, it can fundamentally suppress intergranular corrosion, cold cracking, and hydrogen embrittlement, ensuring weld purity. A high-Cr-Ni-Mo ternary synergistic corrosion-resistant system is used to construct an ultra-strong and dense passivation film. Mn-V-N-Al composite reinforcement is employed to achieve a stable tensile strength of ≥700MPa in the deposited metal under a low-carbon system, while also ensuring low-temperature toughness. V micro-alloying refines the grains, significantly reducing weld crack sensitivity and making it suitable for the high-constraint welding environment of large-diameter ring components.

This invention provides an austenitic stainless steel with excellent resistance to hydrogen embrittlement and extremely low-temperature impact toughness, and a method for manufacturing the same. The austenitic stainless steel according to this invention, by weight percent, comprises: carbon (C): greater than 0% and less than 0.05%, silicon (Si): greater than 0% and less than 1.0%, manganese (Mn): greater than 0% and less than 5.0%, chromium (Cr): 16.0% to 25.0%, molybdenum (Mo): greater than 0% and less than 2.5%, nickel (Ni): 7.0% to 14.0%, copper (Cu): greater than 0% and less than 1.0%, nitrogen (N): 0.05% to 0.28%, with the balance being Fe and other unavoidable impurities. The austenitic stainless steel satisfies the following: an α value of 30.0 or greater; an average δ-ferrite area fraction of 3% or less in the region excluding 1 / 4t from the surface towards the thickness direction; and a density of δ-ferrite particles with a major axis length of 50 μm or more of 0.04 particles / cm³. 2 The following equation applies: α = Ni + 0.65Cr + 0.98Mo + 1.05Mn + 0.35Si + 12.6C + 33.6N ≥ 30.0 (where Ni, Cr, Mo, Mn, Si, C, and N represent the content of each element).

The application belongs to the field of sealing materials, and discloses a high-pressure-resistant hydrogen embrittlement-resistant metal-rubber composite sealing material and a preparation method thereof. The high-pressure-resistant hydrogen embrittlement-resistant metal-rubber composite sealing material comprises, from bottom to top, a titanium alloy base material, a titanium oxide layer generated in situ on the surface of the titanium alloy base material, and a rubber layer bonded to the surface of the titanium oxide layer through hot pressing treatment. The application also discloses a preparation method of the high-pressure-resistant hydrogen embrittlement-resistant metal-rubber composite sealing material. By constructing a hydrogen-inhibiting oxidation layer and combining surface roughening, laser irradiation treatment and hot pressing treatment, a metal-rubber composite sealing material that can maintain stable deformation and is resistant to hydrogen embrittlement in a high-pressure environment is obtained. After the high-pressure-resistant hydrogen embrittlement-resistant metal-rubber sealing material is kept in a 100MPa high-pressure hydrogen environment for 1000 hours, the tensile strength retention rate is greater than or equal to 88%, the elongation retention rate after breaking is greater than or equal to 80%, and the deformation amount is less than or equal to 0.5%.

This invention relates to an X100 grade pipeline steel plate with excellent resistance to hydrogen embrittlement and its manufacturing method. The chemical composition of the pipeline steel plate, by mass percentage, is: C 0.03%–0.04%, Si 0.10%–0.11%, Mn 0.50%–0.52%, P≤0.004%, S≤0.001%, Al 0.015%–0.02%, Ni 0.20%–0.30%, Cr 0.22%–0.27%, Mo 0.22%–0.30%, Cu 0.21%–0.25%, Nb 0.06%–0.08%, V 0.05%–0.07%, Ti 0.028%–0.040%, with the balance being Fe and impurity elements. The advantages are: the yield strength of the pipeline steel plate is ≥690 MPa; the hydrogen-induced cracking performance indicators CSR, CLR, and CTR are all 0.

The application discloses a magnesium alloy with high corrosion resistance and low stress corrosion tendency and a preparation method thereof, and belongs to the technical field of metal materials. The magnesium alloy has the following chemical components: 0.5-1.0% of aluminum, 1.0-4.0% of rare earth elements, and the balance of magnesium and inevitable impurities. The preparation method of the magnesium alloy comprises five steps of melting and casting, homogenization, solid solution treatment, multi-pass rolling and stress relief annealing. The application effectively controls the growth kinetics and growth morphology of the magnesium alloy surface hydroxide in the corrosive medium by reasonably designing the alloy components, increases the density of the magnesium alloy, reduces the penetration of chloride ions and hydrogen in the solution, and effectively reduces the anodic dissolution cracking and hydrogen embrittlement mechanical cracking.

The application provides a 2000MPa or more hot stamping forming component, a steel plate for manufacturing the same and a preparation method thereof, the steel plate comprises the following alloy components in percentage by mass: 0.365-0.455% of C, 0.50-1.35% of Mn, 0.01-0.6% of Si, 0.01-0.6% of Cr, 0.1-0.6% of Al, 0.001-0.01% of B, 0.001-0.02% of P, 0.001-0.01% of N, 0.001-0.01% of S, the balance of Fe and inevitable impurities, carbon equivalent is less than or equal to 0.68, manganese equivalent is 0.80-1.60, and the mass ratio of aluminum to carbon is greater than or equal to 0.5. Through austenitizing treatment and laser cutting process parameter design, the aluminum alloy plated hot forming component with the steel plate as a base body has a tensile strength of more than 2000MPa and low hydrogen brittleness sensitivity.

This invention discloses a method for achieving high hydrogen / deuterium / tritium permeation resistance in oxide coatings. By applying an electric current to an oxide coating (such as zirconium oxide, chromium oxide, titanium oxide, aluminum oxide, etc.) at a certain temperature, the lattice thermodynamic equilibrium is disrupted by the electric field, resulting in a high concentration of lattice point defects generated in situ within the coating, significantly enhancing its hydrogen / deuterium / tritium permeation resistance. Experimental results show that these lattice point defects can form deep-level traps, capturing hydrogen isotope atoms and effectively inhibiting the diffusion and permeation of hydrogen and its isotopes within the coating, thus achieving high hydrogen / deuterium / tritium permeation resistance. This process is simple, efficient, low-cost, and widely applicable, enabling the efficient preparation of oxide coatings with high hydrogen / deuterium / tritium permeation resistance. It has significant application prospects in the fields of tritium permeation protection in fusion reactor structural materials, hydrogen embrittlement protection of metals, and hydrogen permeation resistance in materials used in hydrogen-containing and hydrogen isotope-containing environments.

The present invention provides a hot press-formed member having excellent corrosion resistance and hydrogen embrittlement resistance as well as excellent wear resistance.

The application discloses a hydrogen embrittlement risk early warning method, device, equipment, medium and product. The hydrogen embrittlement risk early warning method comprises the following steps: obtaining a plurality of environmental factors of a working environment of a ring welding joint to be evaluated; the plurality of environmental factors comprise a service temperature, an equivalent stress and an environmental hydrogen parameter; the environmental factors are input into a pre-established multidimensional environmental spectrum to determine a hydrogen embrittlement risk grade corresponding to the environmental factors; wherein the multidimensional environmental spectrum is constructed based on a multivariate mathematical model containing at least one environmental factor interaction term, and is used for representing a spectrum of hydrogen embrittlement sensitivity prediction values changing with the environmental factors; the multidimensional environmental spectrum contains risk grade marks divided based on ranges to which the hydrogen embrittlement sensitivity prediction values belong; and in the case that the hydrogen embrittlement risk grade is higher than a set risk threshold, a risk early warning for the ring welding joint to be evaluated is initiated. The technical scheme of the embodiment of the application can improve the hydrogen embrittlement risk prediction accuracy.