832 results about "Hydrogen embrittlement" patented technology

The invention discloses a bolt hydrogen-induced fatigue life evaluation method and system based on a Bayesian method, and relates to the field of fatigue life evaluation, and the method comprises the steps: obtaining a fatigue constitutive model of a bolt based on a material level; determining a basic fatigue characteristic curve according to the material-level-based fatigue constitutive model of the bolt and material experimental data, and performing stress analysis on a real structure of the bolt by adopting a finite element analysis method to determine a stress concentration coefficient; the fatigue constitutive model based on the material level is corrected according to the stress concentration coefficient and the hydrogen embrittlement correction function, and a corrected fatigue constitutive model is obtained; according to the corrected fatigue constitutive model, determining a nonlinear cumulative damage model by adopting a nonlinear cumulative damage theory; and optimizing the nonlinear cumulative damage model by adopting a Bayesian statistical method according to material experiment data. The method can improve the accuracy and reliability of bolt fatigue life prediction.

The invention relates to the technical field of new energy pipelines, in particular to an anti-cracking hydrogen-doped pipeline system and a performance degradation monitoring method thereof. The hydrogen-doped pipeline system comprises a pipeline assembly, a supporting assembly, an operation assembly, a power assembly, a storage battery pack, a system control cabinet and a power generation assembly, the phenomena of hydrogen permeation and gas stratification are effectively inhibited through innovative pipeline structure design and material optimization in the system level, the hydrogen embrittlement risk is reduced from the source, and the energy consumption is reduced. According to the method, the hydrogen atom diffusion tracking and crack initiation prediction are combined, and a multi-scale collaborative monitoring system is constructed, so that the whole-process monitoring from hydrogen atom diffusion tracking to crack initiation prediction is realized, and particularly, a quantum dot marking technology is combined with a traditional sensing network, so that the service life of the pipeline can be effectively prolonged, and the reliability and the maintenance efficiency of safety monitoring are improved.

The invention discloses a titanium base material bipolar plate corrosion-resistant and hydrogen embrittlement-resistant composite coating and a preparation method thereof. The surface of a titanium base material is sequentially coated with a titanium transition layer, a titanium black hydrogen resistance layer, a titanium hole sealing layer and a precious metal conducting layer; the titanium transition layer is an elemental titanium layer, and the thickness of the titanium transition layer is 10-30 nm; the material of the titanium black hydrogen blocking layer is Magneli-phase titanium black with the molecular formula of TinO2n-1, wherein n is greater than or equal to 4 and less than or equal to 10, and the thickness is 100-150nm; the titanium hole sealing layer is an elemental titanium layer, and the thickness of the titanium hole sealing layer is 10-50nm; the precious metal conducting layer is made of at least one of platinum, gold, ruthenium and iridium, and the thickness of the precious metal conducting layer is 20-50 nm. The corrosion-resistant and hydrogen embrittlement-resistant composite coating disclosed by the invention can effectively block diffusion and permeation of hydrogen in a cathode environment of a PEM water electrolyser while ensuring corrosion-resistant and conductive performance, so that the hydrogen embrittlement-resistant performance of the cathode side of the bipolar plate is greatly improved, and the processing cost and the process complexity of the coating are reduced.

The invention belongs to the technical field of material life prediction, and particularly relates to an X70 steel gas pipeline multi-working-condition life prediction method based on transfer learning. Aiming at the problem of low prediction precision caused by dependence on single working condition data and large distribution difference between laboratory and actual service environment data in a traditional life prediction method, the invention provides a cross-domain transfer learning framework. The method comprises the following steps: acquiring mechanical property data through slow strain tensile tests of different hydrogen doping ratios in a laboratory environment, and constructing a domain self-adaptive life prediction model in combination with multi-modal feature decoupling, dynamic distribution alignment and physical constraint fusion strategies. The method significantly reduces actual scene data requirements, realizes high-precision prediction of the residual life of the pipeline under multiple working conditions, is suitable for oil and gas pipeline health monitoring and hydrogen embrittlement risk assessment, and has the advantages of high efficiency, low cost and high reliability.

The invention provides a static mixer with a bionic starfish type inlet structure and a mixing method thereof. The static mixer comprises a shell, a cavity is formed in the shell, one end of the shell is provided with an air inlet communicating with one end of the cavity, and the other end of the shell is provided with an air outlet communicating with the other end of the cavity; an air inlet pipe set is arranged at the end, close to the air inlet, of the shell and comprises a center air inlet pipe extending in the axial direction and five peripheral air inlet pipes evenly distributed in the circumferential direction of the center air inlet pipe. The central air inlet pipe and the peripheral air inlet pipe form a bionic starfish type inlet structure for simulating a central disc and a radiation wrist structure of starfish; a plurality of spiral pieces arranged in the axial direction of the cavity are arranged in the cavity, and the arrangement angles of the adjacent spiral pieces are different. By means of the bionic starfish type inlet structure design, hydrogen is evenly dispersed to the whole mixing area, the mixing uniformity of natural gas and hydrogen is effectively improved, and meanwhile the risk of hydrogen embrittlement is delayed.

This high-pressure tank stores, inside a tank body, a mixed gas that contains natural gas and hydrogen, and that contains more than 2% hydrogen by volume. The tank body includes: a cylindrical part extending in a first direction; and a dome part connected to both ends of the cylindrical part in the first direction. The steel material constituting the tank body has a tensile strength TS of 850 MPa or higher, has a structure in which 95% or more by area ratio is tempered martensite, and includes carbides of 100 nm or less scattered in the metal structure as precipitates. The high-pressure tank has a strength of 11250 cycles or more in crack progress analysis, suppresses the influence of hydrogen embrittlement in metal, ensures gas storage capacity, and has a reduced weight.

The invention discloses a hydrogen embrittlement-resistant high-strength titanium alloy and a preparation method thereof. The hydrogen embrittlement-resistant high-strength titanium alloy comprises the following components in percentage by mass: 5.5%-6.5% of aluminum, 3.5%-4.5% of tin, 3.2%-3.8% of zirconium, 0.4%-0.6% of molybdenum, 0.7%-1.2% of tungsten, 0.25%-0.35% of niobium, 0.4%-0.6% of silicon, 0.8%-1.2% of yttrium, 0.03%-0.08% of carbon and the balance of titanium and inevitable impurities. The hydrogen embrittlement-resistant high-strength titanium alloy is prepared through the following steps that after cogging treatment is carried out on a smelted as-cast alloy blank, forging and heat treatment are carried out. The titanium alloy has no hydrogen embrittlement phenomenon after hydrogen charging stretching, the strength and hydrogen embrittlement resistance of the material are both considered, the Rm after hydrogen charging can reach 1180 MPa and is higher than that before hydrogen charging, and the ductility after hydrogen charging can reach 11.3% and is equivalent to that before hydrogen charging.

The invention belongs to the field of material testing, and discloses a method and a system for testing a hydrogen-induced cracking threshold value based on a notched round rod tensile sample, the testing method comprises the following steps: in a hydrogen environment and an inert gas environment, respectively carrying out a slow strain rate tensile test on the notched round rod tensile sample to obtain test data and two elongation rates; the hydrogen embrittlement sensitivity index of the material is obtained through the two elongation rates; acquiring elastic-plastic parameters by using the hydrogen embrittlement sensitivity index of the material and test data; when the elastic-plastic parameter is greater than 3.5, acquiring a hydrogen induced cracking threshold value by adopting an elastic-plastic crack propagation mechanism; and when the elastic-plastic parameter is not greater than 3.5, a hydrogen induced cracking threshold value is obtained by adopting a linear elastic crack propagation mechanism. The test method is short in period, high in efficiency and high in universality.

The invention discloses a preparation method of a super hydrogen embrittlement-resistant carbon steel material based on laser surface treatment, which comprises the following steps: carrying out surface pretreatment on a carbon steel substrate, and carrying out surface pretreatment including sand blasting treatment, ultrasonic cleaning and preheating treatment; laser cladding equipment is adopted to synchronously convey alloy powder on the surface of the pretreated carbon steel matrix for alloying treatment, and an alloying layer containing carbide is formed; the laser power and the scanning speed are adjusted to conduct gradient treatment on the alloying layer, and a gradient transition layer from the surface layer to the base body is constructed; performing laser shock peening treatment on the gradient transition layer to generate a shock peening layer; step type annealing treatment is conducted on the base body obtained after impact strengthening, and the component content is monitored in real time; through the synergistic effect of the gradient alloying layer and the impact strengthening layer, a carbide hydrogen barrier and a residual compressive stress protection layer are formed on the surface layer of the material, so that the hydrogen diffusion coefficient is reduced; the gradient transition structure effectively relieves interface stress concentration, and the hydrogen embrittlement resistance of the carbon steel material is improved.

The invention discloses an intelligent early warning and hierarchical linkage disposal method for hydrogen pipeline leakage, and relates to the technical field of hydrogen pipeline safety monitoring, and the method comprises the steps: building a pipeline health fingerprint reference library, deploying a five-dimensional cooperative sensing array, synchronously collecting, purifying and processing leakage and hydrogen embrittlement signals, and extracting core feature parameters; a dynamic algorithm is utilized to quantify hydrogen embrittlement risks, a leakage point is positioned, a comprehensive decision result containing information such as risk types and levels is output, differential grading disposal is started according to the decision result, emergency resources are deployed through a resource scheduling algorithm, a disposal plan is dynamically optimized through a closed-loop feedback mechanism, and efficient management of hydrogen pipeline safety is achieved.

The invention belongs to the field of safe service of hydrogen conveying pipelines, and provides a method for controlling local hydrogen enrichment of a hydrogen conveying pipeline girth welding joint, which provides support for hydrogen embrittlement failure risk management and control of a related hydrogen conveying pipeline girth welding joint area, and comprises the following steps of: establishing a three-dimensional finite element model of the hydrogen conveying pipeline girth welding joint in a ratio of 1: 1 by utilizing ABAQUS simulation software; sequentially calculating a temperature field and a stress field of the ring welding joint; hydrogen permeation parameters of the pipeline base metal and the ring welding joint are obtained through a gas phase hydrogen permeation test; by taking the obtained hydrogen permeation parameters as initial conditions and a stress field as boundary conditions, calculating a full-size hydrogen distribution cloud chart of the ring welding joint of the hydrogen conveying pipeline; local heat treatment is conducted on the ring welding joint, the influence of heat treatment on hydrogen distribution of the full-size pipeline ring welding joint is simulated and calculated, and an optimization strategy for controlling local hydrogen enrichment of the ring welding joint is provided. According to the method, the stress distribution of the ring welding joint is uniform, so that the local hydrogen enrichment degree of the ring welding joint of the hydrogen conveying pipeline is effectively controlled, and the risk of hydrogen induced cracking of the ring welding joint is reduced.

The purpose of the present invention is to provide: a steel material which is suitable as a steel structure used in a hydrogen gas environment, has excellent hydrogen absorption resistance in a hydrogen gas environment, and has excellent hydrogen embrittlement resistance; and a method for producing same.　The steel material has a specific component composition, wherein the amount of saturated hydrogen that has entered in a hydrogen gas environment at a hydrogen gas pressure of 40 MPa is less than a predetermined value. The predetermined value is 0.8 ppm by mass when the tensile strength TS of the steel material is less than 500 MPa, and is a hydrogen amount CH (ppm by mass) calculated from formula (1) when the tensile strength TS of the steel material is 500 MPa or more. (1): CH (ppm by mass) = 5.4637e-0.004 × TS (MPa) In formula (1), TS (MPa) is the tensile strength of the steel material.

The invention discloses a cyanide-free cadmium-iron alloy plating process for high-strength structural steel. The cyanide-free cadmium-iron alloy plating process comprises the step that a nickel-titanium alloy plating layer, a cyanide-free cadmium-iron alloy plating layer and a hexavalent chromium passivation film are sequentially prepared on a high-strength structural steel substrate from inside to outside. The prepared sample piece is subjected to a hydrogen brittleness test according to HB 5067.1-2005 Part 1 of hydrogen brittleness test of plating process: Mechanical Method, and the test result meets the standard requirement; the surface of a plated part is free of white rust after being subjected to an acetate mist test for 400h according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, and a plating layer of the plated part has excellent corrosion resistance; according to GB / T 5270-2005 < GB / T 5270-2005 < GB / T > 5270-2005 < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB /

The invention discloses a low-cost hydrogen embrittlement-resistant titanium bipolar plate for an electrolytic bath and a preparation method of the low-cost hydrogen embrittlement-resistant titanium bipolar plate. The low-cost hydrogen embrittlement-resistant titanium bipolar plate comprises a surface-modified titanium base material, an in-situ hydrogen-resistant layer formed on the surface of the titanium base material, and a noble metal conductive layer prepared on the surface of the in-situ hydrogen-resistant layer, the surface roughness Ra value of the titanium base material subjected to surface modification is 2-3.5 microns; the in-situ hydrogen-resistant layer is a titanium oxide layer or an oxygen inclusion layer which is generated on the surface of the titanium substrate in situ in an air atmosphere or an oxygen-enriched atmosphere, and the thickness of the in-situ hydrogen-resistant layer is 50-200nm; the precious metal conducting layer is made of at least one of platinum, gold, iridium and palladium, and the thickness of the precious metal conducting layer is 20-150 nm. Through simple surface modification and in-situ generation of the hydrogen-resistant layer, the method has the advantages of high process maturity, low process complexity, low material cost and great cost advantage.

The invention relates to a stainless steel flux-cored wire and a preparation method thereof, and relates to the technical field of flux-cored wires. The stainless steel flux-cored wire comprises a stainless steel strip and a double-layer flux core, the stainless steel strip is filled with the double-layer flux core, and the filling amount of the double-layer flux core accounts for 20-25% of the total mass of the stainless steel flux-cored wire; the double-layer flux core comprises a rapid reaction layer and an alloy transition layer, the rapid reaction layer comprises an oil stain oxidizing agent, the oil stain oxidizing agent comprises a high-temperature decomposition type organic matter and an inorganic composition, and the inorganic composition comprises copper oxide and ferric oxide with the mass ratio being (1-1.5): 1. The high-temperature decomposition type organic matter comprises polytetrafluoroethylene micro powder and trisodium citrate according to the mass ratio of 1: (3-5), and the alloy transition layer comprises 316L stainless steel powder, metal powder, silicon powder, niobium carbide and rare earth oxide. The invention can effectively avoid hydrogen embrittlement caused by diffusible hydrogen easily formed by compounds in anti-rust oil remaining on the surface of the welding wire during welding and entering a welding seam.

The invention discloses a hydrogen embrittlement-resistant heterostructure medium manganese steel and a preparation method thereof, and the medium manganese steel comprises the following components in percentage by mass: 0.05-0.3% of C; 3 to 12% of Mn; 0-8% of Al; 0.05% to 0.3% of Nb; 0.05% to 0.1% of V; 0.02-0.4% of Mo, and the balance Fe and inevitable impurities. According to the method, a gradient structure is introduced by adopting high-differential-ratio rolling and passes through Qamp; p, heat treatment to regulate and control the austenite stability and structure. According to the method, rolling parameters and Qamp are adjusted; and P treatment temperature and time are adopted, so that multi-scale and gradient distribution and film-shaped retained austenite are formed, the toughness and crack propagation resistance of the material are enhanced, and the capture and inhibition effects of hydrogen atoms in the material are effectively improved. The mechanical property and the hydrogen embrittlement resistance of the medium manganese steel are synchronously improved.

The invention belongs to the technical field of metal composite materials and hydrogen storage and transportation materials, and particularly relates to a high-strength hydrogen-embrittlement-resistant layered metal composite material for hydrogen storage and a preparation method and application of the high-strength hydrogen-embrittlement-resistant layered metal composite material. According to the preparation method, the nickel-saving austenitic stainless steel (NEASS) and the 30CrMo steel are alternately overlapped in a multi-layer mode, and the processes of vacuum electron beam welding, high-temperature hot rolling, accumulative ply rolling, multi-stage heat treatment and the like are combined, so that the composite board with the layer number reaching hundreds of layers, firm interface bonding, excellent mechanical performance and good hydrogen embrittlement resistance is prepared; the technical problem that strength, toughness and hydrogen brittleness resistance of an existing metal material in a high-pressure hydrogen environment are difficult to consider at the same time is solved. The obtained composite material has high strength, high plasticity and excellent hydrogen embrittlement resistance, and is suitable for structural materials of high-pressure hydrogen storage tanks, hydrogen conveying pipelines and other key hydrogen energy equipment.

The invention discloses an alkaline cyanide-free cadmium plating process for an ultrahigh-strength steel part. The alkaline cyanide-free cadmium plating process comprises the steps of oil removal, stress elimination, electrolytic oil removal, flowing water washing, weak corrosion, flowing cold water washing, copper pre-plating, flowing cold water washing, alkaline cyanide-free cadmium plating, flowing water washing, hydrogen removal, aftertreatment, drying and inspection. In order to avoid the situation that the metal surface of the workpiece is passivated in a plating tank, the pretreatment process is adopted, a cyanide-free copper electroplating layer is pre-plated on the surface of the workpiece, the surface of the part is adjusted, the surface activity is improved, and then the binding force of a base body and the plated cadmium is improved; according to the method, a stress eliminating process and a long-time hydrogen removing process after plating are adopted before plating, so that the hydrogen embrittlement risk is reduced, the process steps are simple, and the implementation is high.

The invention relates to the technical field of hydrogen embrittlement resistance sensitivity testing devices, in particular to a hydrogen embrittlement resistance sensitivity testing device based on a gas inhibitor, which comprises a gas configuration mechanism, the gas outlet end of the gas configuration mechanism is connected with the first gas inlet end of a buffer tank through a first pipeline; the gas outlet end of the buffer tank is connected with the gas inlet end of the reaction kettle through a second pipeline; the gas outlet end of the reaction kettle is connected with the waste gas recycling mechanism through a third pipeline; the gas configuration mechanism comprises a workbench, multiple rows of first gas conveying pipes are arranged on the upper portion of the workbench, the head ends of the multiple rows of first gas conveying pipes are connected with a plurality of gas storage bottles respectively, and the tail ends of the multiple rows of first gas conveying pipes are connected with a first pipeline. According to the invention, by changing the composition and proportion of the inhibition gas and changing the pressure and temperature in the reaction kettle, the visual test research on the hydrogen embrittlement resistance sensitivity of samples with different shapes and sizes in different inhibition gas environments can be realized.

The invention provides a plasma heating hydrogen-rich direct reduction ironmaking system and method. The system comprises a plasma shaft furnace, a heat exchanger, a washer, a desulfurization device, a dehydration device and a pressurization device, the plasma shaft furnace comprises a feeding area, a reduction area, a blanking area and a plasma heating area from top to bottom; the plasma heating area is provided with a hydrogen plasma torch, a thermal reduction gas circulation outlet and a hydrogen inlet; and the hydrogen plasma torch is used for heating and ionizing hydrogen entering from the hydrogen inlet. According to the system and method, the green electricity hydrogen plasma torch is adopted for heating and ionizing hydrogen, then sponge iron is heated and reduced to produce molten iron, compared with a traditional hydrogen heating mode, the heating speed is high, the temperature is high, carbon-containing fuel is not combusted, safety and hydrogen embrittlement are achieved, compared with a traditional shaft furnace for producing sponge iron, low-quality ore can be adopted for producing molten iron, and the production cost is low. The control is convenient.

The invention discloses a hydrogen embrittlement-resistant aluminum-lithium alloy and a preparation method thereof. In order to improve the hydrogen embrittlement resistance of the aluminum-lithium alloy, the element Li is injected into the two faces of the thin-plate-shaped aluminum alloy through vacuum ion injection treatment, then all the elements are fully diffused in a vacuum annealing mode, brittle Li H and Li3A1 H6 phases formed during smelting in the prior art are avoided, and then the aluminum-lithium alloy with the excellent hydrogen embrittlement resistance is obtained. In addition, the metal Hf is added into the aluminum-lithium alloy, so that the ductility of the aluminum-lithium alloy can be effectively improved. Researches show that with the increase of the content of the Hf element, the elongation of the aluminum-lithium alloy is in a trend of increasing first and then decreasing. And on the basis of metal aluminum, when the proportion of Hf is 0.9 wt%-3.5 wt%, the ductility of the alloy material is higher than 10%.

The invention discloses a pickling-free cold heading Kovar alloy wire production process which comprises the following steps: S1, raw material preparation: preparing the following raw materials in percentage by mass: 41.5% of Ni, 0.5% of Co, less than or equal to 0.03% of C, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S and the balance of Fe; mixing the materials, and carrying out vacuum induction melting and electroslag remelting to prepare an alloy ingot; the alloy cast ingot is subjected to hot rolling treatment to form a hot-rolled wire rod with the diameter being 12.0-16.0 mm; s2, peeling treatment is conducted, specifically, surface layer defects of the hot-rolled wire rod in the step S1 are removed through a peeling machine; s3, dry-type drawing treatment is conducted, specifically, the hot-rolled wire rod treated in the step S2 is subjected to dry-type drawing through a dry-type drawing die to form an alloy wire; s4, intermediate annealing treatment is conducted, specifically, the alloy wire in the step S3 is placed in an annealing furnace, sufficient hydrogen is input into the annealing furnace, intermediate annealing is conducted under the hydrogen protection atmosphere, the annealing temperature is 950-1100 DEG C, and the annealing walking speed is 3-5 m / min; the surface quality and the size consistency of the wire can be improved, meanwhile, the defects of environmental pollution, hydrogen embrittlement and the like are reduced, and the use requirements of high-end precise cold heading parts are met.

The invention discloses an annular furnace heat-resistant supporting forged chassis and an additive manufacturing process and a fixing device thereof, and belongs to the technical field of plating of metal materials, and the annular furnace heat-resistant supporting forged chassis comprises the steps that heat-resistant alloy steel base metal with specific components is prepared; carrying out laser texturing and nickel-based alloy bottom layer pretreatment on the surface of the steel plate; performing laser cladding on high-silicon high-temperature alloy powder containing niobium and rare earth elements to form a functional cladding layer, and performing gradient cladding on the edge of the atmosphere guide hole; and finally, carrying out heat treatment and assembling with a fan-shaped refractory brick fixing device. A composite oxide film and a multi-scale strengthening system are constructed, hydrogen resistance and brittleness resistance are effectively achieved, interface thermal stress is relieved, cracking and stripping of a cladding layer are avoided, a fixing device adapts to thermal expansion, the atmosphere is dredged, and the annealing uniformity of a steel coil is improved; the problems of creep deformation, hydrogen embrittlement, cladding layer stripping and thermal stress cracking of a traditional supporting component under the conditions of high temperature, heavy load and nitrogen and hydrogen atmosphere are solved.

The invention discloses a hydrogen embrittlement-resistant welding wire for tailor welding of ultrahigh-strength aluminum-silicon coating hot-formed steel and a welding method, and belongs to the technical field of metal materials. 5.0%-7.0% of Ni; 0.3%-0.6% of Mo; 0.08% to 0.12% of Nb; mo, Nb and C react to form Mo2C / NbC nanophase fixed free hydrogen; 0.05%-0.1% of V: carrying out a reaction to form VC nanophase fixed free hydrogen; 0.5% to 0.8% of La; 0.3%-0.5% of Ce; 0.1%-0.5% of Ti; according to the invention, hydrogen atoms diffused in the welding process can be captured, the hydrogen content in a welding seam is obviously reduced, and the diffusible hydrogen amount is reduced by more than 40% under the hydrogen capturing effect of retained austenite, so that the hydrogen-induced crack sensitivity is reduced by 70%.

The invention discloses austenite hydrogen-resistant stainless steel and a preparation method thereof, and belongs to the field of metal materials. The austenitic hydrogen-resistant stainless steel comprises the following chemical components in percentage by mass: less than or equal to 0.06% of C, less than or equal to 1.00% of Si, 3.00-5.00% of Mn, 19.50-22.00% of Cr, 11.00-13.00% of Ni, 1.50-2.00% of Mo, 1.50-3.50% of Cu, 0.20-0.30% of V, 0.10-0.23% of Nb, 0.30-0.40% of [N], less than or equal to 0.01% of P, less than or equal to 0.004% of S, less than or equal to 0.003% of [O] and the balance of Fe. The preparation method comprises the steps of vacuum induction melting, high-temperature homogenization, forging, hot rolling and heat treatment. The method solves the problems that traditional austenitic stainless steel is poor in hydrogen embrittlement resistance and an existing process is difficult to consider precise regulation and control of high purity, low impurities and hydrogen trap elements at the same time.

Provide a steel material having high strength and excellent hydrogen embrittlement resistance characteristics. The steel material according to the present disclosure has a chemical composition in mass %, C: 0.25 to 0.30%, Si: 0.10 to 0.50%, Mn: 0.05 to 0.60%, P: 0.050% or less, S: 0.0100% or less, Al: 0.001 to 0.100%, Cr: 0.50 to 1.50%, Mo: 0.80 to 2.00%, Ti: 0.002 to 0.010%, V: 0.08 to 0.30%, Nb: 0.010 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0100% or less, O: 0.0100% or less, and the balance consisting of Fe and impurities, a tensile strength of 900 to 1100 MPa, an original austenite grain size of 20.0 μm or less, and a dislocation density of 7.0×10 14 m -2 or less, and the Q value obtained from the line profile of X-ray diffraction is 2.35 or more.

The invention discloses a method for obtaining a critical stress intensity factor of a hydrogen environment material, and belongs to the technical field of stress intensity factor measurement. According to the method disclosed by the invention, a hollow notched sample is prepared from a suitable pipeline material according to hydrogen embrittlement research, then the two ends of the sample are filled with hydrogen, tensile test loading is carried out, and the test is stopped after the sample is failed and fractured due to hydrogen embrittlement. The method is more in line with the actual stress state of the pipeline, can provide the material stress intensity factor value and the critical fracture stress intensity factor of the material under different loads, and has important significance for evaluating the fracture toughness and crack resistance of the material in the hydrogen environment.

The high-strength cold-rolled flat steel product with reduced sensitivity to hydrogen embrittlement according to the present invention comprises a steel substrate consisting of, in mass%, C: 0.20% to 0.40%, Mn: 1.50% to 3.00%, Si: 0.90% to 1.50%, Al: 0.005% to 1.00%, V: 0.01% to 0.30%, optionally Cr: 0.01% to 1.00%, optionally Mo: 0.005% to 0.20%, optionally B: 0.00001% to 0.002%, optionally Nb and Ti: a total content of Nb and Ti of 0.005% to 0.2%, P: up to 0.020%, S: up to 0.005%, N: up to 0.008%, and the balance being Fe and unavoidable impurities. The remainder being Fe and unavoidable impurities, the sum of the proportions of the impurities being < = 0.8%, and the microstructure of the steel substrate comprising, in area%, 65% to 92% of primary (tempered) martensite and at least 8% of retained austenite (RA), the remainder is filled with up to 27% secondary (untempered) martensite, up to 10% bainite or bainite ferrite and / or up to < = 5% polygonal ferrite, the sum of the proportions of secondary (untempered) martensite, bainite or bainite ferrite and polygonal ferrite < = 27%. The invention also provides a method for reliably manufacturing the flat steel product.

The invention discloses a SiO2 / alpha-Al2O3 composite hydrogen-resistant coating for a hydrogen conveying pipeline and a preparation method of the SiO2 / alpha-Al2O3 composite hydrogen-resistant coating, and belongs to the technical field of hydrogen resistance of hydrogen conveying pipelines. The composite hydrogen-resistant coating disclosed by the invention is of a sandwich composite structure of a base material, namely SiO2-alpha-Al2O3; a radio frequency magnetron sputtering method is adopted, the composite coating with the related thickness is flexibly prepared by controlling parameters, the preparation method is simple and easy to implement, the preparation cost is low, and according to related experimental results, it is proved that the obtained SiO2 / alpha-Al2O3 composite hydrogen resistance coating for the hydrogen conveying pipeline is compact in structure, bonding between a base material and SiO2 and between SiO2 and alpha-Al2O3 interfaces is tight, and the film-substrate bonding force is 8.5 N; the hydrogen permeation activation energy is 146.2-177.9 kJ. / mol, the hydrogen permeation pressure index is 0.73-0.91, the problems of hydrogen permeation and hydrogen embrittlement of the hydrogen conveying pipeline can be greatly solved, and the service safety of the hydrogen conveying pipeline is guaranteed.

The present disclosure provides a hydrogen decrepitation apparatus and a hydrogen recycling method. The hydrogen decrepitation apparatus comprises a hydrogen decrepitation furnace, a solid hydrogen-storage device, a first hydrogen recovery pipeline, a second hydrogen recovery pipeline, a hydrogen reuse pipeline, a first discharge pipe, a second discharge pipe, an inert gas pipeline, and a bypass pipeline. The hydrogen decrepitation apparatus enables hydrogen used in hydrogen decrepitation to be reused, thereby reducing costs of hydrogen decrepitation and lowering energy waste.