635 results about "Hydrogen embrittlement" patented technology

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 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.

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 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 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 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%.

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 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.

The present invention discloses a preparation method of a graphite-like carbon nitride-yttrium-stabilized zirconium oxide composite hydrogen barrier coating. First, a low-carbon steel substrate is pretreated to obtain a pretreated substrate; then zirconium n-propyl alcohol, n-propyl alcohol, acetylacetone and yttrium nitrate are mixed and reacted, aged to obtain a yttrium-stabilized zirconium oxide sol; the sol is coated on the pretreated substrate and dried, and the coating, drying and repeated treatments are followed by pre-sintering, followed by repeated coating, drying, and finally heat treatment to obtain a yttrium-stabilized zirconium oxide coating YSZ; melamine and thiourea are mixed, calcined and ground to obtain powdered graphite-like carbon nitride g-C3N4; finally, g-C3N4 powder and a coating coated with YSZ are sintered to obtain a graphite-like carbon nitride-yttrium-stabilized zirconium oxide g-C3N4 / YSZ composite coating. The hydrogen barrier coating prepared by the present invention can solve the problem that hydrogen embrittlement is prone to occur when current steel equipment is used in a hydrogen environment, and improve the safety of steel equipment during hydrogen energy utilization.

The hydrogen transmission pipeline steel comprises the following chemical components in percentage by mass: 0.020%-0.045% of C, 0.11%-0.19% of Si, 1.45%-1.65% of Mn, less than or equal to 0.0010% of S, less than or equal to 0.008% of P, 0.015%-0.045% of Al, 0.040%-0.060% of Nb, 0.020%-0.035% of Ti, 0.30%-0.50% of Cr, 0.0040%-0.0080% of RE, less than or equal to 0.004% of N, less than or equal to 0.0015% of O, less than or equal to 0.0001% of H and the balance of Fe and other inevitable impurities, the conditions that the carbon equivalent Ceq = C + Mn / 6 + (Cr) / 5 is less than or equal to 0.35%, the Nb / Ti = the rare earth element is selected from at least one of lanthanum, cerium and neodymium. The invention aims to solve the technical problems that the existing hydrogen transmission pipeline steel is easy to generate hydrogen embrittlement, short in fatigue life and high in production cost in a high-pressure hydrogen environment, and meets the core requirements of hydrogen energy long-distance transmission pipeline engineering on high strength, high hydrogen embrittlement resistance, high fatigue performance and low cost of materials.

The invention relates to the field of research on hydrogen embrittlement sensitivity of metal materials, in particular to a device for detecting hydrogen embrittlement sensitivity of a metal material in pure hydrogen and hydrogen-doped environments. The whole device is divided into an upper clamp main body and a lower clamp main body which are oppositely arranged up and down, and the upper clamp main body is provided with an upper clamp upper side through hole, an upper clamp lower side through hole, an upper clamp left side through hole, an upper clamp right side through hole and a pressed rod insertion hole. The lower part clamp main body is provided with a sample fixing groove, a sealing groove, an air cavity, a lower part clamp left side ventilation channel, a lower part clamp right side ventilation channel, a lower part clamp upper side screw hole, a lower part clamp lower side screw hole, a lower part clamp left side screw hole and a lower part clamp right side screw hole. According to the device and the method, the real working condition of contact between gas phase hydrogen and a metal material in actual engineering can be simulated, the problem of experimental cost caused by equipment requirements and sample processing can be solved, and meanwhile, the operation process of an experiment can be greatly simplified.

The invention discloses a preparation method of a copper bar with zero high-temperature heating defect, which comprises the following steps of: smelting, up-drawing continuous casting, rolling, coiling, peeling, multi-pass coiling, reserved bottom annealing and drawing, the hydrogen embrittlement grade of the copper rod subjected to upward continuous casting reaches the second grade or below; in the rolling process, the rolling speed is 3-10 m / min, and the machining rate is larger than or equal to 30%. The hydrogen embrittlement grade of the copper rod is reduced, the surface defects of the copper rod are eliminated, and the liquid leakage condition during high-temperature heating is avoided by raising the height of the cooling water tank during upward continuous casting and combining cold machining modes such as rolling and coiling.

The invention belongs to the field of hydrogen conveying, and particularly relates to a flexible hydrogen conveying pipe and a preparation method thereof and a hydrogen leakage detection system.The flexible hydrogen conveying pipe is of a structure mainly made of non-metal materials, the problem of hydrogen embrittlement is fundamentally solved, and the safety and reliability of the hydrogen conveying pipe in the long-term use process are improved. According to the invention, the internal pressure bearing layer is reinforced by adopting high-strength fibers, and can bear higher internal hydrogen pressure after being woven, so that the structural integrity of the pipeline under a high-pressure conveying working condition is guaranteed; meanwhile, the inner pressure bearing layer composite optical fibers can monitor the pipeline state to prevent third-party damage, the optical fiber monitoring system can accurately position the pipeline position in real time and conduct all-dimensional monitoring on the pipeline state, potential safety hazards can be found in time, accurate fault information is provided for maintenance personnel, maintenance measures can be taken in time, and the maintenance efficiency is improved. The accident risk and the maintenance cost are reduced.

The invention relates to the technical field of natural gas transportation safety, in particular to a hydrogen embrittlement risk online monitoring system and method for a hydrogen-doped natural gas pipeline based on multi-parameter fusion, and the system comprises a sentry sensing unit which adopts a metal short pipe which is the same as a to-be-monitored hydrogen-doped natural gas main pipeline in property, material, process, wall thickness and service history, an internal circulating medium is kept consistent with the main pipeline; the risk sensor is provided with a multi-parameter sensor to obtain risk sensing parameters including hydrogen permeation current, pipe wall micro-strain and temperature signal parameters; the signal processing unit is connected with the sentry sensing unit, receives the risk sensing parameters and analyzes and generates hydrogen embrittlement risk indexes through a risk analysis model; and the risk warning unit is connected with the signal processing unit, and triggers a danger prompt signal when the hydrogen embrittlement risk index is greater than a preset safety index. The method has the effect of meeting the danger monitoring effectiveness of safe operation of the hydrogen-doped natural gas pipeline.

The application belongs to the technical field of medium-entropy alloys, and particularly relates to a nano-precipitated phase reinforced hydrogen embrittlement resistant medium-entropy alloy and a preparation method thereof. The medium-entropy alloy with high dispersion distribution of nano-scale L12 phase precipitation is obtained through electric arc melting, homogenization treatment, cold rolling and aging treatment, the strength and toughness of the medium-entropy alloy are matched, the hydrogen embrittlement resistance of the medium-entropy alloy during service is greatly improved, and the comprehensive performance of the material, such as the material strengthening and hydrogen embrittlement resistance, is improved, which has far-reaching significance.

The utility model discloses a high-pressure hydrogen filling system of a sample for a metal material impact test, which comprises a sample hydrogen filling container, a high-pressure recovery container, a low-pressure recovery container, a waste gas tank, a plurality of manual valves, a pressure monitoring device and a hydrogen purity monitoring device which are connected with one another through a process pipeline, the pressure monitoring device is used for monitoring system pressure, and the hydrogen purity monitoring device is used for monitoring hydrogen purity in the pipeline. The utility model provides a movable sample hydrogen charging system, which simulates the service state of a high-pressure hydrogen-contacting equipment material, ensures that enough diffusible hydrogen exists in the material, simultaneously controls the use amount of hydrogen, recycles the used hydrogen, avoids unsafe factors caused by hydrogen emission, can meet the requirement of carrying out an impact test on a metal material under a hydrogen charging condition, and is high in practicability. And a convenient method is provided for metal material hydrogen embrittlement research.

The invention discloses a hydrogen trap characteristic parameter determination method based on a genetic algorithm, and relates to the technical field of hydrogen trap characteristic calculation. Placing the sample in a hydrogen filling device for hydrogen filling treatment, wherein the hydrogen concentration in the sample is saturated; transferring the sample into a heating thermal desorption device for hydrogen desorption treatment, collecting overflowed hydrogen through a mass spectrometer to obtain an actually measured TDS curve, and analyzing the category number of hydrogen traps in the material; according to the McNabb and Foster theories, in combination with an Oriani hypothesis, a calculated TDS curve is obtained; establishing an error function between the actually measured TDS curve and the calculated TDS curve; and according to the error function, a genetic algorithm is adopted to invert and solve the concentration and binding energy of various hydrogen traps. The method can accurately predict the concentration of various hydrogen traps in the material and the characteristic parameters of binding energy, and provides technical support for hydrogen embrittlement prevention design, safety evaluation and the like of steel for hydrogen energy storage and transportation equipment.

The invention belongs to the technical field of energy materials, and discloses a coating material as well as a preparation method and application thereof. The coating material comprises the following components in parts by weight: 50-55 parts of zirconium oxide, 15-18 parts of aluminum oxide, 5.5-9 parts of rare earth oxide, 10-12 parts of a fluorocarbon polymer and 3-4 parts of a silane coupling agent, the rare earth oxide comprises yttrium oxide and cerium oxide. A natural gas hydrogen-doped pipeline coating prepared from the coating material has low permeability, high adhesive force, high hardness and excellent stability, can effectively inhibit hydrogen atoms from gathering and diffusing in the material in high-temperature, high-pressure, hydrogen-doped and other complex environments, has excellent hydrogen embrittlement resistance and good chemical stability and mechanical property, and can be used for preparing the natural gas hydrogen-doped pipeline coating. The pipeline failure risk caused by hydrogen embrittlement can be remarkably reduced, the performance degradation phenomena such as aging and decomposition are not prone to occurring, and long-term stable operation of the pipeline can be guaranteed.

The invention discloses a treatment process method for improving the strength and plasticity of a hydrogen isolation diaphragm and the hydrogen isolation diaphragm. The treatment process method comprises the following steps: S1, carrying out high-frequency vibration and static pressure coupling treatment on the hydrogen isolation diaphragm; and S2, the hydrogen isolation diaphragm is subjected to snakelike line rolling treatment. The hydrogen isolation diaphragm is treated by the treatment process method. According to the treatment process method, high-frequency vibration and static pressure coupling treatment is carried out on the hydrogen isolation diaphragm, and a gradient nanostructure and residual compressive stress are introduced into the surface layer of the hydrogen isolation diaphragm, so that the strength and plasticity of the hydrogen isolation diaphragm are remarkably improved, and the hydrogen embrittlement sensitivity is reduced; therefore, the service life of the hydrogen isolation diaphragm in the high-pressure hydrogen diaphragm compressor is prolonged, and the safety and reliability of equipment are improved.

The present invention belongs to the field of hydrogen transportation, and specifically relates to a flexible hydrogen transmission pipe, a preparation method thereof, and a hydrogen leakage detection system. The flexible hydrogen transmission pipe provided by the present invention adopts a structure mainly made of non-metallic materials, which fundamentally solves the problem of hydrogen embrittlement and improves the safety and reliability of the hydrogen transmission pipe during long-term use. In the present invention, the internal pressure-bearing layer is reinforced with high-strength fibers, which can withstand high internal hydrogen pressure after weaving, ensuring the structural integrity of the pipeline under high-pressure transmission conditions; at the same time, the internal pressure-bearing layer is composited with optical fibers, which can monitor the status of the pipeline to prevent damage by a third party. The optical fiber monitoring system can accurately locate the position of the pipeline in real time and conduct all-round monitoring of the pipeline status, promptly discover potential safety hazards, provide maintenance personnel with accurate fault information, facilitate timely maintenance measures, and reduce accident risks and maintenance costs.

The invention relates to the technical field of optical elements, and discloses a bending-resistant multi-core indoor optical cable and a preparation method thereof. The optical cable comprises an optical fiber unit, a water blocking layer, an inner sheath, an energy dissipation layer, a hydrogen blocking layer, an outer sheath and a gradually-changed braid layer which are sequentially arranged from inside to outside. The energy dissipation layer is formed by spirally twisting a plurality of superelastic nickel-titanium alloy wires and high-strength fibers at a specific pitch, wherein the surfaces of the superelastic nickel-titanium alloy wires are coated with ceramic coatings; and the gradually-changed braid layer is a high-strength fiber braid layer of which the braid density is continuously and gradually changed along the axial direction of the optical cable in a segmented manner. According to the invention, bending mechanical energy is actively dissipated through the spirally twisted superelastic alloy wires, intelligent constraint matched with stress distribution is provided in combination with the external segmented gradient braid layer, and hydrogen embrittlement is inhibited by using a double-layer protection mechanism; the problems that an existing optical cable is prone to fracture and loss is increased sharply due to energy accumulation and stress concentration under repeated bending are systematically solved.

The invention relates to a method for evaluating the hydrogen-induced delayed fracture risk of high-strength steel. The method comprises the following steps: stretching a notch sample to be measured at a strain rate in a range of 3.0 * 10 <-6 >-6.0 * 10 <-5 > s <-1 > until fracture so as to obtain a fracture stress sigma H, and stretching a reference notch sample at a strain rate in a range of 6.0 * 10 <-2 >-10.0 s <-1 > until fracture so as to obtain a reference fracture stress sigma 0; and evaluating the hydrogen-induced delayed fracture risk by using a hydrogen embrittlement risk index HERI = (sigma0-sigmaH) / sigma0 * 100%. According to the evaluation method, the influence of hydrogen in the high-strength steel on the performance can be accurately reflected, the test process is simplified, and rapid inspection on a production site is facilitated. The invention also relates to a method for determining the available dew point range of an austenitizing process for producing a hot-stamped product with an aluminum-silicon coating, which is resistant to hydrogen-induced delayed fracture.

The invention discloses a hydrogen brittleness performance evaluation method for a hydrogen transport pipeline, which comprises the following steps: obtaining the average hydrogen concentration in a sample through a high-pressure hydrogen permeation test of a wafer sample, and obtaining the hydrogen concentration and hydrogen diffusion coefficient of the surface of the sample under a specific electrochemical hydrogen charging condition through an electrochemical hydrogen charging test of the wafer sample; a finite element analysis model of a target sample is established to simulate the change relation of the total amount of hydrogen atoms in the target sample along with time under the electrochemical hydrogen charging condition, and the electrochemical hydrogen charging time equivalent to the high-pressure gaseous hydrogen charging is obtained by comparing the high-pressure gaseous hydrogen charging with the electrochemical hydrogen charging. The target sample is charged with hydrogen through an electrochemical hydrogen charging method, and finally the hydrogen embrittlement performance of the target sample is obtained through a hydrogen embrittlement performance test. According to the method, simple finite element simulation and electrochemical hydrogen charging are combined, high-pressure gaseous hydrogen charging which is complex, low in efficiency and high in danger is replaced, and the detection time of the hydrogen embrittlement performance test of the hydrogen charging pipe is shortened.

The invention relates to the technical field of steel smelting, in particular to a pipeline steel plate for a hydrogen embrittlement-resistant high-pressure pure hydrogen conveying pipeline and a smelting method of the pipeline steel plate. The smelting process comprises the steps of converter smelting, CAS refining, LF refining, RH refining and continuous casting. In LF refining, oxygen is determined after molten steel arrives at a station, silicon iron is added for deoxidation, and the oxygen content of the molten steel is stabilized to be 20-80 ppm; 0.10-0.35 kg of ferrozirconium is added for each ton of steel in the LF refining process, and 0.50-0.80 kg of ferrotitanium is added for each ton of steel after heating is conducted for 5-10 min. Under the equipment condition of a conventional smelting mode, through a special deoxidation mode without adding aluminum, ferrozirconium, ferrotitanium and rare earth alloy materials are added according to a specific process, and the whole process of the smelting process is optimized, so that the purity of molten steel is improved, the morphology of inclusions is improved, absorption and diffusion of hydrogen are inhibited, and a structure refining and hydrogen trap system is stably formed; the prepared pipeline steel plate shows higher hydrogen embrittlement resistance in a high-hydrogen environment, and is particularly suitable for long-term service requirements in high-pressure, variable-load and water-containing hydrogen environments.

The invention relates to the technical field of pure iron preparation through aqueous solution electrolysis, in particular to a method for inhibiting colloid generation in pure iron preparation through FeSO4 solution electrolysis. In the electrolytic bath, a cathode chamber and an anode chamber are separated by using an anion exchange membrane; the anolyte is a Na2SO4 or K2SO4 solution, the catholyte comprises a FeSO4 solution and a reducing agent, and the concentration of SO4 < 2-> in the catholyte is the same as that of SO4 < 2-> in the anolyte. According to the method, the surface roughening phenomenon of a cathode deposition layer is effectively inhibited, the risk of hydrogen embrittlement of pure iron caused by excessive precipitation of hydrogen is avoided, the attenuation rate of current efficiency is remarkably reduced, and therefore synchronous improvement of electrolytic iron product quality, electrolytic efficiency and process stability is achieved; the method has important significance for promoting the development of a pure iron preparation technology by an aqueous solution electrolysis method.

The invention provides a hollow pipe fitting forming device and method. The hollow pipe fitting forming device comprises a heating mechanism, a bulging quenching mold and an air source mechanism. The heating mechanism comprises a roller hearth furnace provided with a conveying roller way, a furnace body is sequentially provided with a feeding isolation chamber, a heating chamber and a discharging isolation chamber in the length direction, all the chambers are isolated from one another and communicated with a protective atmosphere system, and the chambers are used for introducing dry air or inert gas into the furnace body and maintaining the dew point temperature below-15 DEG C; hydrogen adsorption on the surface of the hollow pipe blank is effectively inhibited, and the hydrogen embrittlement risk is reduced. After a pipe blank is heated at a high temperature, austenitizing of a material structure is achieved, then the pipe blank is rapidly transferred to a bulging quenching die, gas expansion deformation occurs in a die cavity under the action of set air pressure, the hollow pipe fitting is formed by attaching the die wall, meanwhile, the hollow pipe fitting attached to the die cavity is synchronously cooled through a cooling assembly in the die, and quenching treatment is achieved. The material structure is converted into martensite, and the mechanical property of a formed part is improved.