94 results about "Erosion corrosion" patented technology

The invention relates to the technical field of high-corrosion-resistance stainless steel pipe processing, and discloses a high-corrosion-resistance high-molybdenum stainless steel pipe processing technology based on gradient carbide design, which comprises the following steps: applying an axial gradient magnetic field in a stainless steel pipe rolling process, and combining with dynamic strain rate matching rolling to promote molybdenum atom grain boundary migration and inhibit carbide coarsening, so as to obtain a high-molybdenum-resistance stainless steel pipe. Nano carbide smaller than or equal to 50 nm is formed on the surface layer, and submicron carbide of 200-500 nm is formed on the core part; after rolling, micro-arc oxidation and phosphonic acid group silane dipping are immediately carried out to form a self-repairing passivation film; and finally, an alternating magnetic field and pulse current are adopted for cooperative annealing, and a grain boundary molybdenum-poor region and residual stress are eliminated. Through magnetic field-chemical-thermal multi-field coupling, the material has erosion corrosion resistance of a gradient carbide structure, dynamic passive film self-repairing and low-temperature high toughness, and is suitable for long-acting protection of deep sea oil and gas pipelines.

The invention discloses a high-flux testing device for accurately testing the dynamic erosion corrosion performance of a material, which comprises a testing kettle, a rotating system, a liquid circulating system and a liquid collecting tank, the rotating system comprises a motor and a rotating blade, and the rotating blade is provided with a sample; the invention further discloses a testing method for high-flux accurate testing of the dynamic erosion corrosion performance of the material. The method comprises the step of injecting the corrosion solution to scour a sample. The rotation system is arranged to realize rotation of the sample, the test kettle and the liquid circulation system matched with the test kettle are arranged to realize erosion of the corrosion solution to the sample, the flow rate is controllable, the corrosion solution can be reused, and a plurality of samples can be subjected to long-time erosion corrosion test in the same environment and under different test conditions. The corrosion performance of the material under the same corrosion environment, different operation states and different temperatures is accurately obtained, so that the function of accurately testing the dynamic erosion corrosion performance at high flux is realized, and the testing device has the characteristics of high safety coefficient, convenience in operation and the like.

The invention belongs to the technical field of ocean engineering, and discloses a seabed vibration elbow solid-liquid two-phase flow erosion corrosion coupling analysis method and system. The method comprises the following steps: establishing a three-dimensional fine model of a local bent pipe section; constructing a flow accelerated corrosion model by using a mass transfer equation and a solubility equation to calculate a flow accelerated corrosion rate; an E / CRC particle erosive wear model is introduced to calculate the erosive wear rate of particles to the wall surface of the pipeline; an erosion-corrosion coupling model is constructed based on the electrochemical corrosion secondary current model to simulate the erosion corrosion process of solid-liquid two-phase flow in the vibration pipeline, and an erosion corrosion coupling response rule in the vibration elbow is obtained. Compared with an original analysis method which only considers erosion wear, the erosion corrosion rate calculation precision is improved by 36%, the simulation result and experiment comparison error is reduced to be within 20%, and technical support is provided for accurate analysis of pipeline damage under the erosion corrosion coupling effect.

The invention discloses a pressure-bearing equipment erosion damage risk quantitative evaluation method, equipment, a medium and a product, and relates to the field of petrochemical engineering pressure-bearing equipment safety, and the method comprises the steps: determining the damage form of the equipment; calculating a local / uniform thinning factor according to the damage form; according to the local / uniform thinning factor, the general condition factor, the mechanical factor and the process factor, calculating to obtain an equipment correction coefficient; according to the equipment correction coefficient, the management system evaluation coefficient, the average failure probability of the similar equipment and the standard exceeding defect influence coefficient, the erosion corrosion failure possibility is obtained through calculation; calculating a leakage result area; according to the leakage consequence area, the erosion corrosion failure consequence is determined; establishing a two-dimensional risk matrix graph according to the erosion corrosion failure possibility and the erosion corrosion failure consequence; the two-dimensional risk matrix graph is used for real-time quantitative evaluation of the erosion risk. The method can effectively guide erosion corrosion risk prevention and control in the petrochemical industry.

The invention discloses a multiphase erosion corrosion coupling damaged pipeline simulation experiment test system and method. Comprising a screw pump, a pressure measurement module, a high-pressure rubber expansion joint, a gas release module, a check valve, a special feeding module, a temperature control measurement module, a wall shear force measurement bin, a fluid acceleration module, a buffer tank, a pipeline pressurization module, a temperature sensor, an electric control cabinet and a copper pipe coil cooler which are arranged on a circulating pipeline. The problem that the gas-liquid / gas-liquid-solid multi-phase erosion and corrosion coupling damage rule and the predicted damage rate are difficult to test in a high-sulfur, high-chlorine and high-acid severe environment in a petrochemical chemical production device is solved, and the damage rate of the petrochemical chemical production device is predicted by designing a special feeding structure, a pressurizing structure, an accelerating structure, a constant temperature structure, an anti-corrosion structure, an anti-abrasion structure, an anti-vibration structure and other structures and a temperature, flow, concentration and pressure precise regulation and control system. Long-time stable operation and accurate measurement of multi-phase scouring and corrosion coupling damage are realized, and safety evaluation and risk prevention and control of complex flow-induced damage of a petrochemical chemical production device are effectively supported.

The invention belongs to the technical field of surface engineering, and particularly relates to a laser cladding iron-based corrosion-resistant and wear-resistant coating and a preparation method thereof. The invention relates to a laser cladding iron-based corrosion-resistant and wear-resistant coating which comprises the following iron-based alloy powder components in percentage by mass: 0.2-0.4% of C; 2.0 to 3.0% of B; the content of Cr is 12.0 to 16.0 percent; 0.5 to 1.0 percent of Ti; 0.5 to 1.5 percent of Si; 0.5 to 1.0 percent of Ni; 0.3 to 0.7% of Ce; s is less than 0.03%; p is less than 0.045%; and the balance of Fe. The coating has the beneficial effects that the coating takes the iron-based alloy powder as a raw material, and the iron-based alloy powder is uniformly cladded on the surface of the H13 steel by utilizing a laser directional energy deposition technology, so that a compact and uniform corrosion-wear-resistant cladding layer is formed, and the service life of the material under the working condition of erosion corrosion of molten aluminum is remarkably prolonged.

The invention discloses a planar short-wave infrared detector and a preparation method and application thereof. The preparation method comprises the following steps: S1, sequentially growing the buffer layer, the N-type contact layer, the absorption layer, the undoped P-type layer and the cap layer on the substrate; s2, growing a layer of dielectric film on the surface of the cap layer; corroding the exposed cap layer by adopting a wet etching process; s3, removing the dielectric film after corrosion is finished; p-doped Al < 1-w > InwAs is grown in the corrosion area; s4, removing the cap layer and the P-doped Al < 1-w > InwAs on the upper surface of the undoped P-type layer; s5, growing a layer of passivation film on all the exposed upper surfaces; and forming a pattern of a metal contact layer on the surface of the passive film by photoetching to form a P electrode and an N electrode. According to the invention, the problem of high Zn diffusion process difficulty caused by large lattice mismatch between the epitaxial layer with high In component and the substrate is solved, and the performance of the device is improved.

The utility model provides multi-angle rotary experimental equipment for erosion corrosion of a high-temperature saline solution. The device is made of customized acrylic materials, a JJ-1B type motor is selected as a rotating motor, the diameter of a rotating disc is 100 mm, and three kinds of rotating discs with different impact angles are manufactured in total. The centers of the samples are fixed on a rotary erosion corrosion device through bolts, three parallel samples are arranged in each group, the experiment temperature is 80 + / -5 DEG C, and the experiment time is 120 hours. The experimental medium is deionized water and a 3.5% NaCl solution. The erosion corrosion resistance of the material can be further analyzed by recording weight change results and weightlessness experiment results of different samples.

The invention belongs to the technical field of erosion corrosion experiment testing, and particularly discloses an erosion corrosion experiment device and method for liquid-solid two-phase flow immersion jet flow, a cooling system is designed for solving the problem that the temperature of an erosion corrosion solution is increased due to the throttling effect, the heat dissipation area of a circulating erosion system is increased through finned tubes, and the heat dissipation efficiency is improved. And the erosion corrosion solution flowing through the finned tube can transfer heat to the liquid in the heat exchange groove, so that the temperature of a fluid medium of the erosion corrosion solution in the circulating erosion system is reduced. According to the invention, the included angle between the sample and the nozzle can be changed through the angle adjusting mechanism so as to test the material damage condition under the impact of different angles and different flow velocities, so that the real-time monitoring of the electrochemical process of the liquid-solid two-phase flow damaged material is realized; the erosion corrosion damage process and mechanism of a material in a multiphase flow environment can be researched conveniently, and gas can be injected into the immersion jet tank through the gas storage bottle and the gas injection pipe so as to realize an under-pressure experiment for dissolving acid gas.

The invention relates to the technical field of heat exchangers, and discloses a variable-angle guide plate structure for a fluorine-coated steel heat exchanger, which comprises a shell, end sockets are mounted at the left and right ends of the shell, tube plates are mounted at the left and right ends of the inner wall of the shell, and a plurality of tube bundles are jointly mounted on the tube plates on the left and right sides in a penetrating manner; and a plurality of baffle plates which are uniformly distributed from left to right are mounted on the inner wall of the shell in a sliding manner. The variable-angle guide plate structure for the fluorine-coated steel heat exchanger can effectively solve the problems that in the prior art, a traditional fixed guide plate structure cannot optimize flow field distribution in real time, local retention of media in a shell pass can be caused to form a dead zone, or turbulent flow impact is caused by too high flow speed, heat exchange efficiency is reduced, erosion corrosion to a heat exchange pipe can be aggravated, and the service life of the heat exchange pipe is prolonged. The service life of equipment is shortened; the problems that a heat exchanger shell needs to be disassembled during angle adjustment, the industrial production continuity is seriously affected, a fluorine coating is likely to be scratched and fall off due to external force collision, and the anti-corrosion protection function of the heat exchanger shell is greatly attenuated are solved.

The invention belongs to the technical field of metal material stress corrosion test, and relates to a deep sea simulation test device for dynamic and static loading process, the main structure of the deep sea simulation test device comprises a pressure-resistant test cabin, and a loading sample piece, a pressure-resistant reference electrode and an annular auxiliary electrode arranged in the pressure-resistant test cabin, the loading sample piece is completely arranged in the pressure-resistant test cabin, and the annular auxiliary electrode is arranged in the pressure-resistant reference electrode. An adapter is connected with a dynamic and static loading system after penetrating through a cabin to perform static or dynamic stress loading, a pressure-resistant electrochemical test system is adopted to perform electrochemical characterization, test or polarization potential application, and a multi-factor control system is adopted to control main deep sea environmental factors such as temperature, pressure and dissolved oxygen content. High-precision and high-reliability test data can be quickly obtained, and corrosion electrochemical behaviors in stress corrosion and corrosion fatigue processes of metal materials in a deep sea simulation environment can be more truly reflected; the method provides support for metal material in-situ slow strain rate stress corrosion and corrosion fatigue test in a deep sea simulation environment and electrochemical test and characterization in the process.

The utility model discloses a coast subgrade framework in the field of coast subgrades, which aims to solve the problem that a concrete wall is easy to corrode and crack under long-time erosion corrosion of seawater in the prior art, and comprises a stainless steel plate, a wave dissipation plate for buffering sea wave impact and a buffering component, the stainless steel plate is mounted on a coastal surface of a coast subgrade, and the buffering component is mounted on the coastal surface of the coast subgrade. The wave dissipation plates are arranged on the stainless steel plate, the buffering assembly is arranged between the stainless steel plate and the wave dissipation plates, the wave dissipation plates are sequentially arranged on the stainless steel plate, and the ends of every two adjacent wave dissipation plates are arranged in an overlapped mode. The wave dissipation plates are sequentially arranged on the adjacent sea surface of the coast roadbed, the ends of every two adjacent wave dissipation plates are overlapped, the hinge pieces are arranged, when the wave dissipation plates are impacted by sea water, the wave dissipation plates can rotate by a certain angle, the wave dissipation plates rotate to the overlapped parts close to the upper ends, the impact of the sea water is buffered through the two wave dissipation plates at the same time, and the wave dissipation effect is improved. The buffering effect is improved, and the service life of the wave dissipation plate can be prolonged.

This invention discloses a method, equipment, medium, and product for quantitatively assessing the risk of erosion damage to pressure equipment, relating to the safety of pressure equipment in the petrochemical and chemical industries. The method includes: determining the damage form of the equipment; calculating a local / uniform thinning factor based on the damage form; calculating an equipment correction coefficient based on the local / uniform thinning factor, a general condition factor, a mechanical factor, and a process factor; calculating the probability of erosion corrosion failure based on the equipment correction coefficient, a management system evaluation coefficient, the average failure probability of similar equipment, and an impact coefficient for defects exceeding standards; calculating the leakage consequence area; determining the consequences of erosion corrosion failure based on the leakage consequence area; and establishing a two-dimensional risk matrix based on the probability of erosion corrosion failure and the consequences of erosion corrosion failure. The two-dimensional risk matrix is ​​used for real-time quantitative assessment of erosion risk. This invention can effectively guide the prevention and control of erosion corrosion risks in the petrochemical and chemical industries.

This utility model relates to the field of biogas hydrogen sulfide pipeline technology and discloses a protective structure for biogas hydrogen sulfide pipeline corrosion, including a transmission pipeline and a fixing sleeve. A spraying mechanism is fixedly installed on the side of the transmission pipeline, and a flow rate regulating mechanism is fixedly installed on the inner wall of the fixing sleeve. The flow rate regulating mechanism includes a bend, and a connecting block is fixedly installed on the inner wall of the bend. First, the speed of the drive motor is adjusted by the controller, thereby adjusting the flow rate generated when the fan blades rotate. Then, the drive motor is turned on, and the rotation of the drive motor drives the fan blades to rotate, thereby drawing air from outside the bend into the bend. The air is then diverted through the bend and split into eight transmission pipes, and then transmitted through a filter plate to the inside of the transmission pipeline. This adjustment of the flow rate inside the transmission pipeline helps to reduce the corrosiveness of hydrogen sulfide to the transmission pipeline. By controlling the upper limit of the flow rate, erosion corrosion is minimized, thus improving the protection of the transmission pipeline.

The present invention provides a metal pipe scour corrosion test device, including a reactor and a water supply and drainage circulation device; the reactor is provided with an installation port, a water outlet, a water inlet and a sewage outlet from top to bottom, and the water supply and drainage device is connected with the water inlet and the water outlet of the reactor; a test device is provided inside the reactor between the water inlet and the water outlet; the test device includes a circular metal bracket, a test disc, a plastic pipe ring and a metal sample, the outer periphery of the metal bracket is fixed on the inner wall of the reactor, the test disc is placed on the metal bracket, and the inner diameter of the metal bracket is smaller than the outer diameter of the test disc. First, it creatively realizes the simulation of the corrosion of metal materials under the flow conditions of the water medium in the actual working conditions, which is highly consistent with the actual working conditions, and improves the accuracy and precision of the simulation experiment; second, the metal sample is fixed on the plastic pipe ring, which can avoid the potential difference between the metal sample and the test device and the test disc affecting the corrosion rate accuracy, and further improves the accuracy of the simulation experiment.

The application discloses a kind of test device and method for general erosion corrosion in fast reactor coolant environment, it is related to nuclear power material testing technical field, including corrosion kettle, heating device, stirring device and object table, heating device is used to heat corrosion kettle, stirring device includes rotary drive device and stirring assembly, the fixed end of rotary drive device is fixedly arranged on corrosion kettle, the driving end of rotary drive device is fixedly connected with stirring assembly, stirring assembly is inserted into corrosion kettle, for stirring the cooling medium in corrosion kettle, object table is arranged in corrosion kettle for carrying corrosion sample, gas inlet is provided on corrosion kettle, gas inlet is used to pass into hydrogen gas or oxygen gas mixture, to adjust the oxygen concentration in corrosion kettle.The application can truly reproduce the environment of flow medium erosion, corrosion deterioration and oxygen concentration synergistic effect under actual working condition.

The invention discloses a screening method and application of a liquid lead bismuth corrosion resistant material based on a sandwich structure. The outer layer of the sandwich structure is a target component film, and the interlayer is a lead-bismuth alloy film. The screening method comprises the following steps: S1, preparing a sandwich structure composite film material; s2, in-situ corrosion of liquid lead and bismuth of the composite film material; and S3, characterizing the corroded composite film material, and judging the liquid lead and bismuth corrosion resistance of the target component in the composite film material according to the characterization result. A sandwich structure film sample is prepared by utilizing a magnetron sputtering technology, the oxygen content of sandwich lead bismuth alloy is regulated and controlled by controlling the atmosphere in the deposition process, a corrosion interface of liquid lead bismuth and a test material is explored by adopting in-situ heating, and the problems that oxygen atoms are adsorbed on the surface of the sample, the oxygen content in the liquid lead bismuth cannot be precisely regulated and controlled and the like are solved. The corrosion performance of the material in oxygen-controlled liquid lead bismuth can be rapidly and efficiently obtained, and the method has important significance on rapid screening of novel lead bismuth corrosion resistant materials.

The invention relates to the field of oil and gas well drilling and production, and discloses experimental equipment for simulating erosion corrosion of an oil and gas well at high temperature and high pressure and a use method thereof. The experimental equipment comprises an erosion corrosion fluid module, a corrosion fluid module, a reaction kettle and a damage analysis module. The erosion corrosion fluid module is used for manufacturing an erosion corrosion fluid material; the corrosive fluid module is used for manufacturing corrosive fluid materials. The reaction kettle is provided with a reaction chamber for mounting an experimental object, and the experimental object is a combined body comprising an oil pipe, a sleeve and a cement sheath; the experimental object and the reaction chamber act together to form a first chamber in the oil pipe and communicated with the erosion corrosion fluid module, a second chamber located between the oil pipe and the casing pipe and communicated with the erosion corrosion fluid module, and a third chamber located between the casing pipe and the cement sheath and communicated with the erosion corrosion fluid module. And the damage analysis module is used for analyzing the experimental object and obtaining an erosion-corrosion analysis result of the experimental object, so that the erosion-corrosion resistance test experiment of the material under the complex underground working condition is completed.

The invention discloses a wellbore corrosion simulation evaluation system for oil and gas wells, including an oil casing evaluation module, a corrosion hanging plate module, a scaling evaluation module, an electrochemical corrosion probe module and a double-layer circulation pipeline; the oil casing evaluation module, the corrosion hanging plate module, the scaling evaluation module and the electrochemical corrosion probe module are all connected to the double-layer circulation pipeline, the oil casing evaluation module is used for fluid scouring simulation of the oil casing and the inner coating of the oil casing; the corrosion hanging plate module is used for dynamic scouring corrosion simulation of the fluid; the scaling evaluation module is used for scaling simulation of the oil casing; the electrochemical corrosion probe module is used for electrochemical corrosion simulation of the oil casing. It can simulate the corrosion and scaling factors such as fluid flow rate, pressure, temperature in the wellbore environment, and can be used to carry out oil casing corrosion rate testing, corrosion behavior and corrosion mechanism research, anti-corrosion measures effect evaluation, corrosion inhibitor optimization, scale inhibitor optimization, incompatible fluid scaling status research, etc., to provide an effective evaluation means for the anti-corrosion and anti-scaling work of oil and gas wells.

The invention relates to a UTG glass melting furnace tank bottom bubbling device which comprises a bubbling pipe, a bubbling nozzle and a bubbling nozzle, the nozzle brick is embedded into the pool bottom of the UTG glass melting furnace, a mounting through hole is formed in the nozzle brick, and the bubbling pipe is mounted on the nozzle brick through the mounting through hole; the bubbling boss is formed by arranging pool bottom bricks around the nozzle brick, the height of the bubbling boss is higher than that of the pool bottom of the UTG glass melting furnace, the height of the nozzle brick is higher than that of the bubbling boss, and the pool bottom of the UTG glass melting furnace, the bubbling boss and the nozzle brick form a stepped pool bottom bubbling structure. The structural strength of the pool bottom around the bubbling nozzle is enhanced, and the distance from the bubbling nozzle to the pool bottom is also increased, so that molten glass caused by bubbling is prevented from flowing back to be excessively close to the pool bottom, erosion corrosion to pool bottom bricks is reduced, the service life of the pool bottom bubbling device and the glass melting furnace is prolonged, and the production cost is reduced. And the turbid defect caused by scouring and erosion of molten glass is also avoided.

The present invention discloses an erosion corrosion simulation test device for an aluminum radiator of an indirect cooling system and a method for using the same. The device includes a water storage tank, a constant temperature heating device, a dissolved oxygen regulating device, a circulating water pump, a circulating water bypass filtering device, a suspended matter generating bypass, a 0° erosion corrosion simulation component, and a 45° erosion corrosion simulation component. The test device can accurately regulate the pH value, dissolved oxygen content, suspended matter content, and flow rate of the circulating water. The erosion corrosion simulation component uses the SCAL type indirect cooling system aluminum tube spare parts as the test object. The internal structure of the simulation component is designed with reference to the on-site aluminum tube use environment, and can more realistically simulate the water flow state at the aluminum tube nozzle position during system operation. Two experimental bypasses are designed in the device, which can simultaneously simulate the erosion corrosion of the aluminum tube nozzles in the system with erosion angles of 0° and 45°.

The invention belongs to the technical field of material corrosion resistance testing, and discloses a liquid lead-bismuth high-speed erosion-corrosion device and method with controllable flow rate, comprising a liquid lead-bismuth environment module, an air supply module, a control module and a loading module; a liftable liquid-cooled sealing section is constructed by a KF flange water-cooled sealing lower connecting pipe and a KF flange water-cooled sealing upper connecting pipe, and a method combining a ferrule connection and a KF vacuum seal is used to achieve a telescopic lifting effect of the water-cooled section; in conjunction with a lifting platform, the accuracy of the erosion-corrosion test results can be guaranteed to the maximum extent, and the static oxidation corrosion influence of the liquid metal on the sample during the oxygen reduction process in the early stage of the test can be prevented; at the same time, a baffle plate is added to the inner wall of the test kettle to limit the relative flow caused by the viscosity of the liquid metal during the rotation of the re-corrosion test stand, thereby greatly reducing the error between the erosion speed calculated by the motor speed and the actual erosion speed.

The invention discloses an erosion corrosion early warning method, device and equipment for a tail gas pipeline of a reduction furnace. The method comprises the following steps: firstly, acquiring multi-source real-time data of a target monitoring point in the tail gas pipeline of the reduction furnace; based on the multi-source real-time data, obtaining a future silicon powder mass concentration prediction sequence and a future airflow velocity prediction sequence; inputting the data into a pre-constructed dynamic wear rate model and an effective impact energy accumulation model, and respectively calculating to obtain a first future pipe wall residual thickness sequence and a second future pipe wall residual thickness sequence; comparing the predicted pipe wall residual thickness at each future moment in the future pipe wall residual thickness sequence with a preset pipe wall residual thickness safety threshold, and determining a first predicted residual life and a second predicted residual life; and finally, based on the first predicted residual life and the second predicted residual life, generating early warning information of the pipeline eroded and corroded by the silicon powder. According to the invention, high-precision and foresight early warning of the erosion corrosion risk of the tail gas pipeline of the reduction furnace can be realized.

The invention belongs to the technical field of pipeline transportation, and particularly relates to a pipeline joint. The pipeline joint comprises a second pipeline and a first pipeline communicated to the pipe wall of the second pipeline, an arc-shaped piece is arranged in the connecting position of the second pipeline and the first pipeline, and fluid flows to the second pipeline from the first pipeline. According to the invention, erosion corrosion can be greatly reduced, the use safety and reliability of the sewage gathering and transportation pipeline are improved, and the maintenance and use cost is reduced.

The invention discloses seawater mortar erosion corrosion resistant steel and a preparation method thereof, belongs to the technical field of alloy steel, and solves the problems that wear-resistant steel in the prior art is high in high-cost element content and high in cost; and the erosion corrosion resistance of the existing wear-resistant steel is limited to be improved. The seawater mortar erosion corrosion resistant steel comprises the following components in percentage by mass: 0.12%-0.24% of C, 0.1%-0.6% of Si, 0.2%-1.17% of Mn, 2.0%-5.0% of Cr, 0.2%-1.0% of Al, 0.001%-0.003% of B, 0.01%-0.1% of Nb, less than or equal to 0.02% of P, less than or equal to 0.005% of S and the balance of Fe and inevitable impurities, and Cr / Al is more than or equal to 2 and less than or equal to 10. The seawater mortar erosion corrosion resistant steel is low in cost and excellent in mechanical property, welding property and seawater mortar erosion corrosion resistance.

The utility model relates to a hot mill vertical roll cooling water flexible sealing device, which comprises a U-shaped ring, a fixing plate, a positioning plate and a flexible scraper, the U-shaped ring is sleeved on a connecting rod beside a vertical roll, the fixing plate is of an L-shaped structure, one end of the fixing plate is fixedly connected with the U-shaped ring, the other end of the fixing plate is fixedly connected with the flexible scraper, and the shape of the outer edge of the flexible scraper is matched with that of the vertical roll. The device has the advantages that the structure is simple and reasonable, the device is mounted in the space from the connecting rod of the bearing seat to the working surface of the vertical roll, so that the flexible scraper is in contact with the vertical roll to form a water seal structure, and vertical roll cooling water in a rack is prevented from being sprayed to the vertical roll, then enters the rack and is sprayed to the edge of strip steel and the rack, the temperature reduction speed of the edge of the strip steel is high, and the quality of finished rolled products is affected. In addition, loss of erosion corrosion of vertical roll cooling water to the rack roll fixing seat and corresponding equipment is reduced.

The invention provides duplex stainless steel for a concentrated sulfuric acid environment and a preparation method and application of the duplex stainless steel, and the duplex stainless steel comprises the following components in percentage by weight: less than or equal to 0.03 wt% of C, less than or equal to 1.50 wt% of Mn, less than or equal to 2.0 wt% of Si, less than or equal to 0.03 wt% of P, less than or equal to 0.02 wt% of S, 24.5-27.0 wt% of Cr, 7.0-9.0 wt% of Ni, 3.5-4.5 wt% of Mo, 3.0-4.0 wt% of Cu, 0.50-1.0 wt% of W, 0.20-0.30 wt% of N and the balance of Fe and inevitable impurities. Through alloying of low carbon, high chromium, added nickel, copper, tungsten, nitrogen and other elements and coordination of all the components, the duplex stainless steel has good obdurability, sulfuric acid uniform corrosion resistance, erosion corrosion resistance, cavitation corrosion resistance and the like. The prepared duplex stainless steel can serve as an equipment material which is subjected to concentrated sulfuric acid and long-term scouring of fluid, the service time of the material can be remarkably prolonged, the maintenance cost and the construction period of the material are reduced, and the safety reliability and the production efficiency of fluid equipment operation are improved.

The invention provides a method and a device for accurately controlling and detecting sand content in an erosion experiment, and relates to the technical field of pipeline multiphase flow erosion corrosion, the device comprises a sand amount control part used for adjusting the sand adding amount of solid sand, so that a medium solution and the solid sand are uniformly mixed to obtain a sand-containing solution; and the sand amount detection part is used for detecting the sand content of the sand-containing solution. The invention provides the method and the device for controlling and detecting the sand content, which are simple, accurate and easy to realize. When the method and the device are applied to the pipe flow test, the problems of sand deposition, uneven sand distribution in a solution medium and the like are solved, the real flowing and scouring conditions of the pipeline are accurately reduced, and a foundation is laid for accurately analyzing the scouring corrosion mechanism.

An internal combustion engine lubricating oil composition for reducing corrosion of an engine of a hybrid vehicle is disclosed. The reduction in corrosion may be determined by the JIS K2246 test method. A method for reducing corrosion of an engine of a hybrid vehicle using the lubricating oil composition is also disclosed.

The invention discloses corrosion-resistant wear-resistant steel and a manufacturing method thereof, and belongs to the technical field of wear-resistant steel and preparation thereof, the wear-resistant steel comprises the following chemical components in percentage by weight: less than or equal to 0.22% of C, less than or equal to 0.50% of Si, less than or equal to 0.50% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, less than or equal to 0.25% of Ni, less than or equal to 5.00% of Cr, less than or equal to 0.10% of Mo, less than or equal to 0.1% of rare earth + Nb and the balance of Fe, and the sum of the components is 100%. According to the wear-resistant steel produced by adopting a new process of specific alloy design of Cr + rare earth La and Ce + low-defect continuous casting + high-permeability rolling + multi-beam array jet flow constrained roller quenching, the alloy content is less than or equal to 6 wt%, the thickness is 8-40 mm, the surface hardness is 430-470 HBW, the corrosion and wear resistance is improved by more than two times compared with that of conventional NM450 under the acidic condition that the Ph value is 4-7, and the corrosion and wear resistance of the wear-resistant steel is greatly improved. And meanwhile, good machinability and welding performance are achieved.