Device and method for testing hydrogen embrittlement sensitivity of pipeline steel

Abstract

The invention provides a pipeline steel hydrogen embrittlement sensitivity testing device and method, and belongs to the technical field of material mechanical property testing, and the method comprises the following steps: a hydrogen supply system is used for filling hydrogen with different preset hydrogen partial pressures into a hydrogen-doped sealed cabin, and controlling the hydrogen concentration within a preset concentration range; the loading system is used for applying tensile force to the to-be-tested pipeline steel sample and carrying out stress stretching until the to-be-tested pipeline steel sample is fractured; the evaluation data measurement system is used for measuring hydrogen embrittlement sensitivity evaluation data when the pipeline steel sample to be tested is fractured under the conditions of different hydrogen partial pressures and different temperatures; and the control system is used for controlling the hydrogen supply system, the loading system and the evaluation data measurement system, monitoring the test process, recording hydrogen embrittlement sensitivity evaluation data and establishing a hydrogen embrittlement sensitivity evaluation database of the pipeline steel sample. According to the scheme, the reliability and applicability of the hydrogen embrittlement sensitivity test of the pipeline steel can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of material mechanical property testing, and in particular to a pipeline steel hydrogen embrittlement sensitivity testing device and method. Background Art

[0002] As the core material of long-distance oil and gas pipelines, pipeline steel's mechanical properties and reliability are crucial to the safe operation of pipelines. However, in actual service, especially in high pressure, high temperature and hydrogen environments, pipeline steel faces serious hydrogen embrittlement problems.

[0003] At present, most of the existing hydrogen embrittlement test methods are carried out at room temperature or low pressure, which cannot effectively simulate the actual service state of pipeline steel in high temperature and high pressure hydrogen environment. Although these traditional test methods can reflect some hydrogen embrittlement behaviors, the reliability and applicability of the test results are limited due to the difference between the test conditions and the actual application environment. Therefore, it is impossible to accurately evaluate the hydrogen embrittlement sensitivity of pipeline steel in complex environments, nor can it provide strong technical support for pipeline design and material selection.

[0004] Therefore, how to improve the reliability and applicability of pipeline steel hydrogen embrittlement sensitivity testing has become an issue to be resolved. Summary of the invention

[0005] The purpose of the present application is to provide a pipeline steel hydrogen embrittlement sensitivity testing device and method, which can solve the problem of how to improve the reliability and applicability of pipeline steel hydrogen embrittlement sensitivity testing in the prior art.

[0006] In a first aspect, an embodiment of the present application provides a pipeline steel hydrogen embrittlement sensitivity testing device, the device comprising: The hydrogen supply system is used to fill the hydrogen-doped sealed cabin with hydrogen of different preset hydrogen partial pressures and control the hydrogen concentration within the preset concentration range; the pipeline steel sample to be tested is placed in the hydrogen-doped sealed cabin; A loading system is used to apply a tensile force to the pipeline steel sample to be tested, and perform stress stretching until the pipeline steel sample to be tested breaks; An evaluation data measurement system is used to measure the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when it breaks under different hydrogen partial pressures and different temperatures; Control system, used to control the hydrogen supply system, loading system and evaluation data measurement system, monitor the test process and record the hydrogen embrittlement sensitivity evaluation data, and establish a hydrogen embrittlement sensitivity evaluation database for pipeline steel samples; Among them, the hydrogen embrittlement sensitivity evaluation database is used to evaluate the hydrogen embrittlement sensitivity of pipeline steel samples.

[0007] In a possible implementation of the first aspect, the hydrogen supply system includes: a hydrogen cylinder, a pressure reducing valve, a flow controller and a piping system; the hydrogen cylinder is used to store hydrogen, the pressure reducing valve is used to reduce the pressure of the hydrogen, the flow controller is used to control the flow of hydrogen filled into the hydrogen-doped sealed cabin, and the piping system is used to transport the hydrogen from the hydrogen cylinder to the hydrogen-doped sealed cabin.

[0008] In a possible implementation manner of the first aspect, the loading system is further used to adjust in real time the tensile force applied to the pipeline steel sample to be tested, as well as the strain rate and loading rate during the tensile process.

[0009] In a possible implementation of the first aspect, the loading system includes: a driving device and a stretching device; the driving device is used to drive the stretching device based on the control of the control system; the stretching device is used to apply a stretching force to the pipeline steel sample to be tested under the drive of the driving device to perform stress stretching until the pipeline steel sample to be tested breaks.

[0010] In a possible implementation of the first aspect, the hydrogen embrittlement sensitivity evaluation data includes: elongation at break, tensile force at break, fracture stress, fracture toughness index, and hydrogen embrittlement sensitivity index; the evaluation data measurement system includes: a displacement measurement system and a mechanical property measurement system; The displacement measurement system is used to measure the elongation of the pipeline steel sample to be tested during the tensile process, calculate the elongation at fracture based on the elongation of the pipeline steel sample to be tested when it breaks, and record the deformation of the pipeline steel sample to be tested; the mechanical property measurement system is used to monitor and record the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when it breaks.

[0011] In a possible implementation of the first aspect, the displacement measurement system includes: an extensometer or an optical displacement sensor; the mechanical property measurement system includes: a force sensor and a data acquisition system; the force sensor is used to monitor in real time the tensile force at break, the fracture stress, the fracture toughness index and the hydrogen embrittlement sensitivity index; the data acquisition system is used to collect the tensile force at break, the fracture stress, the fracture toughness index and the hydrogen embrittlement sensitivity index.

[0012] In a possible implementation manner of the first aspect, the control system is further used to set test parameters for a pipeline steel hydrogen embrittlement sensitivity test.

[0013] In a possible implementation manner of the first aspect, the testing device further includes: a main frame structure, an induction heating furnace, a sample clamping device, a hydrogen-doped sealed cabin, and a hydrogen emission safety protection system; The main frame structure is used to support and fix the test device; the induction heating furnace is used to heat the pipeline steel samples to be tested to different preset temperatures based on the control of the control system; the sample clamping device is used to fix the pipeline steel samples to be tested; the hydrogen-doped sealed cabin is used to contain the hydrogen-doped gas and place the pipeline steel samples to be tested; the hydrogen emission safety protection system is used to control the emission and circulation of hydrogen based on the control system.

[0014] In a possible implementation manner of the first aspect, the temperature range of the induction heating furnace is from room temperature to 100° C., the preset temperature is between room temperature and 100° C., and the temperature control accuracy is ±1° C.

[0015] In a possible implementation manner of the first aspect, the hydrogen emission safety protection system includes: a safety valve, a pressure relief device, and a gas monitor; The safety valve is used to control the hydrogen partial pressure of the hydrogen-doped sealed cabin to not exceed a preset value; the pressure relief device is used to discharge a preset amount of hydrogen to reduce the hydrogen partial pressure of the hydrogen-doped sealed cabin; the gas monitor is used to monitor the hydrogen-doped gas in the hydrogen-doped sealed cabin.

[0016] In a possible implementation of the first aspect, a preset hydrogen partial pressure range of the hydrogen supply system is 0.1-20 MPa, and the hydrogen partial pressure of the hydrogen filled into the hydrogen-doped sealed cabin is a constant value during the pipeline steel hydrogen embrittlement sensitivity test.

[0017] In a second aspect, an embodiment of the present application provides a pipeline steel hydrogen embrittlement sensitivity testing method, which is implemented based on the pipeline steel hydrogen embrittlement sensitivity testing device of any one of the first aspects; the method comprises: Based on the hydrogen supply system, hydrogen with different preset hydrogen partial pressures is filled into the hydrogen-doped sealed cabin, and the hydrogen concentration is controlled within the preset concentration range; the pipeline steel sample to be tested is placed in the hydrogen-doped sealed cabin; Applying tensile force to the pipeline steel sample to be tested based on the loading system to perform stress stretching until the pipeline steel sample to be tested breaks; Based on the evaluation data measurement system, the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested is measured under different hydrogen partial pressure and temperature conditions when the sample is fractured; Based on the control system, the hydrogen supply system, loading system and evaluation data measurement system are controlled, the test process is monitored and the hydrogen embrittlement sensitivity evaluation data is recorded, and a hydrogen embrittlement sensitivity evaluation database for pipeline steel samples is established; Among them, the hydrogen embrittlement sensitivity evaluation database is used to evaluate the hydrogen embrittlement sensitivity of pipeline steel samples.

[0018] In a possible implementation of the second aspect, the testing device further includes: an induction heating furnace, a sample clamping device, and a hydrogen-doped sealed cabin; before filling the hydrogen-doped sealed cabin with hydrogen having different preset hydrogen partial pressures based on the hydrogen supply system, the method further includes: The pipeline steel sample to be tested is placed in a hydrogen-doped sealed cabin and fixed by a sample clamping device; the induction heating furnace is started by controlling the control system to heat the pipeline steel sample to different preset temperatures.

[0019] In a possible implementation manner of the second aspect, it is characterized in that the loading system includes: a driving device and a stretching device; applying a tensile force to the pipeline steel sample to be tested based on the loading system to perform stress stretching until the pipeline steel sample to be tested breaks, including: Based on the driving device, the stretching device is driven according to the control of the control system; based on the stretching device, a tensile force is applied to the pipeline steel sample to be tested under the drive of the driving device to perform stress stretching until the pipeline steel sample to be tested breaks.

[0020] In a possible implementation manner of the second aspect, the method further includes: based on the loading system, adjusting in real time the tensile force applied to the pipeline steel sample to be tested, as well as the strain rate and loading rate during the tensile process.

[0021] In a possible implementation manner of the second aspect, it is characterized in that the hydrogen embrittlement sensitivity evaluation data includes: elongation at break, tensile force at break, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index; the evaluation data measurement system includes: a displacement measurement system and a mechanical property measurement system; based on the evaluation data measurement system, the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when fracture occurs is measured under different hydrogen partial pressure and temperature conditions, including: Based on the displacement measurement system, the elongation of the pipeline steel sample to be tested during the stretching process is measured. According to the elongation of the pipeline steel sample to be tested when it breaks, the elongation at break is calculated, and the deformation of the pipeline steel sample to be tested is recorded. At the same time, based on the mechanical property measurement system, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when it breaks are monitored and recorded.

[0022] In a possible implementation manner of the second aspect, it is characterized in that the mechanical property measurement system includes: a force sensor and a data acquisition system; based on the mechanical property measurement system, monitoring and recording the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when fracture occurs, including: Based on the force sensor, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index are monitored in real time; based on the data acquisition system, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index are collected.

[0023] In a possible implementation of the second aspect, before controlling the hydrogen supply system, the loading system and the evaluation data measurement system based on the control system, the method further includes: setting test parameters for the pipeline steel hydrogen embrittlement sensitivity test based on the control system.

[0024] In a possible implementation of the second aspect, the testing device further includes a hydrogen emission safety protection system; the method further includes: based on the hydrogen emission safety protection system, controlling the emission and circulation of hydrogen according to a control system.

[0025] In the present application scheme, the hydrogen supply system fills hydrogen into the hydrogen-doped sealed cabin, the loading system stretches the pipeline steel sample to be tested to fracture, the evaluation data measurement system measures the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested under different hydrogen partial pressure and temperature conditions, the control system monitors the test process and records the hydrogen embrittlement sensitivity evaluation data, and establishes a hydrogen embrittlement sensitivity evaluation database for evaluating the hydrogen embrittlement sensitivity of the pipeline steel sample.

[0026] The present application scheme can measure and obtain hydrogen embrittlement sensitivity evaluation data not only at room temperature or low-pressure hydrogen environment, but also in high-temperature and high-pressure hydrogen environment. It can accurately evaluate the hydrogen embrittlement sensitivity of pipeline steel in complex environments, improve the reliability and applicability of pipeline steel hydrogen embrittlement sensitivity testing, and has strong ease of use and practicality.

[0027] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a schematic diagram of the overall structure of a pipeline steel hydrogen embrittlement sensitivity testing device provided in an embodiment of the present application; Figure 2 is a schematic diagram of the structure of a pipeline steel sample to be tested provided in an embodiment of the present application; Figure 3 It is a schematic diagram of the specific structure of the pipeline steel hydrogen embrittlement sensitivity testing device provided in the embodiment of the present application; Figure 4 It is a schematic diagram of the steps of the pipeline steel hydrogen embrittlement sensitivity testing method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0031] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or photovoltaic components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, photovoltaic components and / or combinations thereof.

[0032] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0033] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0034] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0035] In addition, in the description of the present application, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0037] As the core material of long-distance oil and gas pipelines, pipeline steel's mechanical properties and reliability are crucial to the safe operation of pipelines. However, in actual service, especially in high pressure, high temperature and hydrogen environments, pipeline steel faces serious hydrogen embrittlement problems.

[0038] Hydrogen embrittlement refers to the phenomenon that hydrogen penetrates into the interior of steel, causing its strength and toughness to drop significantly, thereby increasing the risk of brittle fracture of the material. This phenomenon is more prominent in a high-pressure hydrogen environment, which may cause sudden pipeline fracture accidents and seriously threaten the safety of energy transportation.

[0039] At present, most of the existing hydrogen embrittlement test methods are carried out at room temperature or low pressure, which cannot effectively simulate the actual service state of pipeline steel in high temperature and high pressure hydrogen environment. Although these traditional test methods can reflect some hydrogen embrittlement behaviors, the reliability and applicability of the test results are limited due to the difference between the test conditions and the actual application environment. Therefore, it is impossible to accurately evaluate the hydrogen embrittlement sensitivity of pipeline steel in complex environments, nor can it provide strong technical support for pipeline design and material selection.

[0040] With the rapid development of hydrogen energy technology and the increase in hydrogen applications, the market and research fields have put forward higher requirements for test methods that can accurately control hydrogen partial pressure under high temperature conditions and systematically study hydrogen embrittlement behavior. Therefore, how to improve the reliability and applicability of pipeline steel hydrogen embrittlement sensitivity testing has become an unresolved issue.

[0041] In response to the above-mentioned defects, an embodiment of the present application provides a pipeline steel hydrogen embrittlement sensitivity testing device and method, wherein a hydrogen supply system fills hydrogen into a hydrogen-doped sealed cabin, a loading system stretches the pipeline steel sample to be tested until it breaks, an evaluation data measurement system measures and obtains hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested under different hydrogen partial pressure and temperature conditions, a control system monitors the test process and records the hydrogen embrittlement sensitivity evaluation data, and establishes a hydrogen embrittlement sensitivity evaluation database for evaluating the hydrogen embrittlement sensitivity of pipeline steel samples.

[0042] The present application scheme can measure and obtain hydrogen embrittlement sensitivity evaluation data not only in normal temperature or low-pressure hydrogen environment, but also in high-temperature and high-pressure hydrogen environment, thereby evaluating the safety of hydrogen-doped pipelines. It can accurately evaluate the hydrogen embrittlement sensitivity of pipeline steel in complex environments, improve the reliability and applicability of pipeline steel hydrogen embrittlement sensitivity testing, and has strong ease of use and practicality.

[0043] This application scheme integrates advanced high-temperature control technology and hydrogen supply system, which can accurately measure the changes in mechanical properties of pipeline steel under different hydrogen partial pressures and high temperature environments, and establish a comprehensive hydrogen embrittlement sensitivity evaluation database. It not only fills the gap in existing technologies, but also provides a scientific basis for the material selection and design of pipeline steel, and provides reliable data support for pipeline design, which helps to improve the safety and reliability of pipeline systems in complex environments.

[0044] The specific process implemented by this application is introduced below through specific embodiments.

[0045] See also Figure 1 , Figure 1 1 is a schematic diagram of the overall structure of a pipeline steel hydrogen embrittlement sensitivity testing device 100 provided in an embodiment of the present application. Figure 1 As shown, the device 100 includes: a hydrogen supply system 110 , a loading system 120 , an evaluation data measurement system 130 and a control system 140 .

[0046] In some embodiments, the hydrogen supply system is used to fill the hydrogen doped sealed cabin (hydrogen filling sealed cabin) with hydrogen of different preset hydrogen partial pressures and control the hydrogen concentration within a preset concentration range. The pipeline steel sample to be tested is placed in the hydrogen doped sealed cabin, and after a period of time, hydrogen will penetrate into the pipeline steel sample to be tested.

[0047] The preset hydrogen partial pressure and the preset concentration range can be determined according to the specific situation in the actual application scenario, and are not specifically limited here. In order to ensure safety, the hydrogen supply system requires strict sealing and explosion-proof design. In one embodiment, the structural schematic diagram of the pipeline steel sample to be tested is as follows: Figure 2 Take X52 pipeline steel as an example, Figure 2 The samples are made into samples of different sizes and placed in a hydrogen-filled sealed cabin.

[0048] In some embodiments, the loading system is used to apply a tensile force to the pipeline steel sample to be tested, and perform stress stretching until the pipeline steel sample to be tested breaks. In one embodiment, the loading system can perform slow stress stretching on the pipeline steel sample to be tested, stretching the pipeline steel sample to be tested at a slow speed, and the stress of the pipeline steel sample to be tested changes slowly during the stretching process.

[0049] It should be noted that the initial value of the tensile force applied by the loading system to the pipeline steel sample to be tested is a constant value, and the tensile force will change during the process of the loading system stretching the pipeline steel sample to be tested.

[0050] In some embodiments, the evaluation data measurement system is used to measure the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when it is fractured under different hydrogen partial pressures and different temperatures, and input the hydrogen embrittlement sensitivity evaluation data into the control system. Multiple groups of tests are performed under different hydrogen partial pressures and different temperatures to obtain the hydrogen embrittlement sensitivity evaluation data of the pipeline steel under different environmental conditions.

[0051] In some embodiments, the control system is used to control the hydrogen supply system, the loading system, and the evaluation data measurement system, monitor the test process and record the hydrogen embrittlement sensitivity evaluation data, and establish a hydrogen embrittlement sensitivity evaluation database for pipeline steel samples. The hydrogen embrittlement sensitivity evaluation database is used to evaluate the hydrogen embrittlement sensitivity of pipeline steel samples.

[0052] See also Figure 3 , Figure 3 Schematic diagram of the specific structure of the pipeline steel hydrogen embrittlement sensitivity test device provided in the embodiment of the present application. Figure 3 As shown, the hydrogen supply system includes: a hydrogen cylinder, a pressure reducing valve, a flow controller and a pipeline system. The hydrogen cylinder is used to store hydrogen, the pressure reducing valve is used to reduce the pressure of hydrogen, the flow controller is used to control the flow of hydrogen filled into the hydrogen-doped sealed cabin, and the pipeline system is used to transport hydrogen from the hydrogen cylinder to the hydrogen-doped sealed cabin.

[0053] The loading system needs to have high precision and controllability. According to one embodiment of the present application, the loading system is also used to adjust in real time the tensile force applied to the pipeline steel sample to be tested, as well as the strain rate and loading rate during the tensile process.

[0054] Please continue to see Figure 3 According to one embodiment of the present application, the loading system includes: a driving device and a stretching device. The driving device is used to drive the stretching device based on the control of the control system, and the stretching device is used to apply a stretching force to the pipeline steel sample to be tested under the drive of the driving device to perform stress stretching until the pipeline steel sample to be tested breaks. The driving device includes: a servo motor or a hydraulic cylinder.

[0055] According to one embodiment of the present application, the hydrogen embrittlement sensitivity evaluation data includes: elongation at break, tensile force at break, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index. Figure 3 ,The evaluation data measurement system includes: displacement measurement system and mechanical property measurement system.

[0056] The displacement measurement system is used to measure the elongation (extension) of the pipeline steel sample to be tested during the tensile process, calculate the elongation at break based on the elongation of the pipeline steel sample to be tested when it breaks, and accurately record the deformation of the pipeline steel sample to be tested. The mechanical properties measurement system is used to monitor and record the tensile force at break, fracture stress, fracture toughness index, and hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when it breaks.

[0057] Please continue to see Figure 3 According to one embodiment of the present application, the displacement measurement system includes: an extensometer or an optical displacement sensor. The mechanical property measurement system includes: a force sensor and a data acquisition system. The force sensor is used to monitor the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index in real time to ensure the accuracy of the test data. The data acquisition system is used to collect the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index.

[0058] According to one embodiment of the present application, the control system is also used to set test parameters for the hydrogen embrittlement sensitivity test of pipeline steel, such as hydrogen partial pressure, temperature, tensile force, stress, strain rate, loading rate and other parameters.

[0059] Please continue to see Figure 3 According to one embodiment of the present application, the testing device further includes: a main frame structure, an induction heating furnace, a sample clamping device, a hydrogen-doped sealed cabin, and a hydrogen emission safety protection system.

[0060] The main frame structure is used to support and fix the frame structure of the entire test device. The main frame structure is made of high-strength metal to ensure the stability and accuracy of the equipment. The induction heating furnace is used to heat the pipeline steel sample to be tested to different preset temperatures based on the control of the control system. The induction heating furnace can be a high-temperature furnace, providing a device for heating the sample to a preset high temperature. The high-temperature furnace requires precise temperature control and can maintain uniform temperature distribution.

[0061] The sample clamping device is used to fix the pipeline steel sample to be tested. It can be a fixture and is usually required to be able to remain stable under high temperature and high pressure to avoid slippage or stress concentration. The hydrogen-doped sealed cabin is used to contain hydrogen-doped gas and place the pipeline steel sample to be tested, and can seal the hydrogen to prevent leakage.

[0062] The hydrogen emission safety protection system is used to control the emission and circulation of hydrogen based on the control system and prevent hydrogen leakage during the test. It is a safety device that can ensure the safety of operators and the stable operation of equipment. After the test, hydrogen is safely discharged through the hydrogen emission safety protection system.

[0063] According to one embodiment of the present application, the temperature range of the induction heating furnace is from room temperature to 100°C, and the preset temperature at which the induction heating furnace heats the pipeline steel sample to be tested is between room temperature and 100°C. The temperature control accuracy is ±1°C, that is, the difference between the actual heating temperature of the induction heating furnace and the preset temperature does not exceed 1°C. In one embodiment, the induction heating furnace heats the pipeline steel sample to be tested to 40°C.

[0064] Please continue to see Figure 3 According to one embodiment of the present application, a hydrogen emission safety protection system includes: a safety valve, a pressure relief device and a gas monitor.

[0065] The safety valve is used to control the hydrogen partial pressure of the hydrogen-doped sealed cabin not to exceed a preset value. The pressure relief device is used to discharge a preset amount of hydrogen to reduce the hydrogen partial pressure of the hydrogen-doped sealed cabin. The gas monitor is used to monitor the hydrogen-doped gas in the hydrogen-doped sealed cabin.

[0066] According to one embodiment of the present application, the preset hydrogen partial pressure of the hydrogen supply system is in the range of 0.1 to 20 MPa. The hydrogen partial pressure of the hydrogen filled into the hydrogen-doped sealed cabin is a fixed value during the pipeline steel hydrogen embrittlement sensitivity test and is kept constant to maintain a stable hydrogen environment. In one embodiment, the preset hydrogen partial pressure is 4 MPa.

[0067] See also Figure 4 , Figure 4 Schematic diagram of the steps of the pipeline steel hydrogen embrittlement sensitivity test method provided in the embodiment of the present application. Figure 1 The pipeline steel hydrogen embrittlement sensitivity testing device shown is implemented, and the method may include the following steps: S401, hydrogen with different preset hydrogen partial pressures is filled into the hydrogen doped sealed cabin based on the hydrogen supply system, and the hydrogen concentration is controlled within a preset concentration range; the pipeline steel sample to be tested is placed in the hydrogen doped sealed cabin.

[0068] It should be noted that the specific implementation principle of this embodiment has been described in the above embodiments and will not be repeated here.

[0069] According to one embodiment of the present application, the testing device further includes: an induction heating furnace, a sample clamping device, and a hydrogen-doped sealed cabin. Before filling the hydrogen-doped sealed cabin with hydrogen of different preset hydrogen partial pressures based on the hydrogen supply system, the method may further include the following steps: The pipeline steel sample to be tested is placed in a hydrogen-doped sealed cabin and fixed by a sample clamping device. The induction heating furnace is started by a control system to heat the pipeline steel sample to different preset temperatures.

[0070] In one embodiment, the pipeline steel sample to be tested is placed in a hydrogen-doped sealed cabin, and the sample is clamped by a clamp. A high-temperature furnace is started to heat the sample, and hydrogen gas of a preset pressure is filled into the hydrogen-doped sealed cabin.

[0071] S402, applying a tensile force to the pipeline steel sample to be tested based on the loading system to perform stress stretching until the pipeline steel sample to be tested breaks.

[0072] According to an embodiment of the present application, the loading system includes: a driving device and a stretching device. Based on the loading system, a tensile force is applied to the pipeline steel sample to be tested, and stress stretching is performed until the pipeline steel sample to be tested breaks, which may include the following steps: Based on the driving device, the stretching device is driven according to the control of the control system. Based on the stretching device, under the driving of the driving device, a tensile force is applied to the pipeline steel sample to be tested, and stress stretching is performed until the pipeline steel sample to be tested is broken.

[0073] According to an embodiment of the present application, the method may further include the following steps: based on the loading system, adjusting in real time the tensile force applied to the pipeline steel sample to be tested, as well as the strain rate and loading rate during the tensile process.

[0074] It should be noted that the specific implementation principle of this embodiment has been described in the above embodiments and will not be repeated here.

[0075] S403, based on the evaluation data measurement system, under different hydrogen partial pressure and temperature conditions, obtain the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when fracture occurs.

[0076] According to an embodiment of the present application, it is characterized in that the hydrogen embrittlement sensitivity evaluation data includes: elongation at break, tensile force at break, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index, and the evaluation data measurement system includes: a displacement measurement system and a mechanical property measurement system. Based on the evaluation data measurement system, the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when fracture occurs is measured under different hydrogen partial pressure and temperature conditions, which may include the following steps: Based on the displacement measurement system, the elongation of the pipeline steel sample to be tested during the stretching process is measured, and the elongation at break is calculated based on the elongation of the pipeline steel sample to be tested when it breaks, and the deformation of the pipeline steel sample to be tested is recorded. At the same time, based on the mechanical property measurement system, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when it breaks are monitored and recorded.

[0077] According to an embodiment of the present application, it is characterized in that the mechanical property measurement system includes: a force sensor and a data acquisition system. Based on the mechanical property measurement system, monitoring and recording the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when it breaks may include the following steps: Based on the force sensor, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index are monitored in real time. Based on the data acquisition system, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index are collected.

[0078] It should be noted that the specific implementation principle of this embodiment has been described in the above embodiments and will not be repeated here.

[0079] S404, based on the control system, the hydrogen supply system, the loading system and the evaluation data measurement system are controlled, the test process is monitored and the hydrogen embrittlement sensitivity evaluation data is recorded, and a hydrogen embrittlement sensitivity evaluation database for pipeline steel samples is established; wherein the hydrogen embrittlement sensitivity evaluation database is used to evaluate the hydrogen embrittlement sensitivity of pipeline steel samples.

[0080] According to one embodiment of the present application, before controlling the hydrogen supply system, the loading system and the evaluation data measurement system based on the control system, the method may further include the following steps: setting the test parameters of the pipeline steel hydrogen embrittlement sensitivity test based on the control system.

[0081] According to an embodiment of the present application, the test device further comprises a hydrogen emission safety protection system. The method may further comprise the following steps: based on the hydrogen emission safety protection system, controlling the emission and circulation of hydrogen according to a control system.

[0082] It should be noted that the specific implementation principle of this embodiment has been described in the above embodiments and will not be repeated here.

[0083] The embodiments of the present application provide a pipeline steel hydrogen embrittlement sensitivity testing device and method. A hydrogen supply system fills hydrogen into a hydrogen-doped sealed cabin. A loading system stretches the pipeline steel sample to be tested until it breaks. An evaluation data measurement system measures the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested under different hydrogen partial pressures and temperature conditions. A control system monitors the test process and records the hydrogen embrittlement sensitivity evaluation data, and establishes a hydrogen embrittlement sensitivity evaluation database for evaluating the hydrogen embrittlement sensitivity of the pipeline steel sample.

[0084] The present application scheme can measure and obtain hydrogen embrittlement sensitivity evaluation data not only in normal temperature or low-pressure hydrogen environment, but also in high-temperature and high-pressure hydrogen environment, thereby evaluating the safety of hydrogen-doped pipelines. It can accurately evaluate the hydrogen embrittlement sensitivity of pipeline steel in complex environments, improve the reliability and applicability of pipeline steel hydrogen embrittlement sensitivity testing, and has strong ease of use and practicality.

[0085] This application scheme integrates advanced high-temperature control technology and hydrogen supply system, which can accurately measure the changes in mechanical properties of pipeline steel under different hydrogen partial pressures and high temperature environments, and establish a comprehensive hydrogen embrittlement sensitivity evaluation database. It not only fills the gap in existing technologies, but also provides a scientific basis for the material selection and design of pipeline steel, and provides reliable data support for pipeline design, which helps to improve the safety and reliability of pipeline systems in complex environments.

[0086] The present application scheme realizes the testing of hydrogen embrittlement sensitivity of pipeline steel under different hydrogen partial pressures and high temperature conditions, can simulate actual application scenarios, and evaluate the hydrogen embrittlement sensitivity of pipeline steel under different hydrogen partial pressures under high temperature conditions.

[0087] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0088] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0089] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0090] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A pipeline steel hydrogen embrittlement sensitivity testing device, characterized in that: The device comprises: The hydrogen supply system is used to fill the hydrogen-doped sealed cabin with hydrogen of different preset hydrogen partial pressures and control the hydrogen concentration within the preset concentration range; the pipeline steel sample to be tested is placed in the hydrogen-doped sealed cabin; A loading system, used for applying a tensile force to the pipeline steel sample to be tested, and performing stress stretching until the pipeline steel sample to be tested breaks; An evaluation data measurement system is used to measure and obtain hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when fracture occurs under different hydrogen partial pressures and different temperatures; A control system, used to control the hydrogen supply system, the loading system and the evaluation data measurement system, monitor the test process and record the hydrogen embrittlement sensitivity evaluation data, and establish a hydrogen embrittlement sensitivity evaluation database for pipeline steel samples; The hydrogen embrittlement sensitivity evaluation database is used to evaluate the hydrogen embrittlement sensitivity of pipeline steel samples.

2. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 1 is characterized in that: The hydrogen supply system includes: a hydrogen cylinder, a pressure reducing valve, a flow controller and a piping system; The hydrogen cylinder is used to store hydrogen, the pressure reducing valve is used to reduce the pressure of hydrogen, the flow controller is used to control the flow of hydrogen filled into the hydrogen-doped sealed cabin, and the pipeline system is used to transport hydrogen from the hydrogen cylinder to the hydrogen-doped sealed cabin.

3. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 1, characterized in that: The loading system is also used to adjust in real time the tensile force applied to the pipeline steel sample to be tested, as well as the strain rate and loading rate during the tensile process.

4. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 1, characterized in that: The loading system comprises: a driving device and a stretching device; The driving device is used to drive the stretching device based on the control of the control system; The stretching device is used to apply a stretching force to the pipeline steel sample to be tested under the drive of the driving device to perform stress stretching until the pipeline steel sample to be tested breaks.

5. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 1, characterized in that: The hydrogen embrittlement sensitivity evaluation data include: elongation at break, tensile force at break, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index; the evaluation data measurement system includes: a displacement measurement system and a mechanical property measurement system; The displacement measurement system is used to measure the elongation of the pipeline steel sample to be tested during the stretching process, calculate the elongation at break based on the elongation of the pipeline steel sample to be tested when it breaks, and record the deformation of the pipeline steel sample to be tested; The mechanical property measurement system is used to monitor and record the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when the sample fractures.

6. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 5, characterized in that: The displacement measurement system includes: an extensometer or an optical displacement sensor; the mechanical property measurement system includes: a force sensor and a data acquisition system; The force sensor is used to monitor the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index in real time; the data acquisition system is used to collect the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index.

7. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 1, characterized in that: The control system is also used to set test parameters for pipeline steel hydrogen embrittlement sensitivity testing.

8. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 1, characterized in that: The testing device also includes: a main frame structure, an induction heating furnace, a sample clamping device, a hydrogen-doped sealed cabin, and a hydrogen emission safety protection system; A main frame structure, used to support and fix the test device; an induction heating furnace, used to heat the pipeline steel sample to be tested to different preset temperatures based on the control of the control system; a sample clamping device, used to fix the pipeline steel sample to be tested; A hydrogen-doped sealed cabin is used to contain hydrogen-doped gas and place the pipeline steel sample to be tested; a hydrogen emission safety protection system is used to control the emission and circulation of hydrogen based on the control system.

9. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 8, characterized in that: The temperature range of the induction heating furnace is from room temperature to 100 °C, the preset temperature is between room temperature and 100 °C, and the temperature control accuracy is ±1 °C.

10. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 8, characterized in that: The hydrogen emission safety protection system includes: a safety valve, a pressure relief device and a gas monitor; The safety valve is used to control the hydrogen partial pressure of the hydrogen-doped sealed cabin to not exceed a preset value; the pressure relief device is used to discharge a preset amount of hydrogen to reduce the hydrogen partial pressure of the hydrogen-doped sealed cabin; the gas monitor is used to monitor the hydrogen-doped gas in the hydrogen-doped sealed cabin.

11. The pipeline steel hydrogen embrittlement sensitivity testing device according to any one of claims 1 to 10, characterized in that: The preset hydrogen partial pressure range of the hydrogen supply system is 0.1-20 MPa, and the hydrogen partial pressure of the hydrogen filled into the hydrogen-doped sealed cabin is a constant value during the pipeline steel hydrogen embrittlement sensitivity test.

12. A method for testing hydrogen embrittlement sensitivity of pipeline steel, characterized in that: Based on the pipeline steel hydrogen embrittlement sensitivity testing device described in any one of claims 1 to 11; the method comprises: Based on the hydrogen supply system, hydrogen with different preset hydrogen partial pressures is filled into the hydrogen-doped sealed cabin, and the hydrogen concentration is controlled within the preset concentration range; the pipeline steel sample to be tested is placed in the hydrogen-doped sealed cabin; Applying a tensile force to the pipeline steel sample to be tested based on a loading system to perform stress stretching until the pipeline steel sample to be tested breaks; Based on the evaluation data measurement system, under different hydrogen partial pressure and temperature conditions, the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested is measured when fracture occurs; Based on the control system, the hydrogen supply system, the loading system and the evaluation data measurement system are controlled, the test process is monitored and the hydrogen embrittlement sensitivity evaluation data is recorded, and a hydrogen embrittlement sensitivity evaluation database of pipeline steel samples is established; The hydrogen embrittlement sensitivity evaluation database is used to evaluate the hydrogen embrittlement sensitivity of pipeline steel samples.

13. The method for testing hydrogen embrittlement sensitivity of pipeline steel according to claim 12, characterized in that: The testing device further includes: an induction heating furnace, a sample clamping device, and a hydrogen-doped sealed cabin; before filling the hydrogen-doped sealed cabin with hydrogen having different preset hydrogen partial pressures based on a hydrogen supply system, the method further includes: Placing the pipeline steel sample to be tested in a hydrogen-doped sealed cabin, and fixing the pipeline steel sample to be tested based on a sample clamping device; Based on the control system, the induction heating furnace is controlled to start, and the pipeline steel sample to be tested is heated to different preset temperatures.

14. The method for testing hydrogen embrittlement sensitivity of pipeline steel according to claim 12, characterized in that: The loading system comprises: a driving device and a stretching device; applying a tensile force to the pipeline steel sample to be tested based on the loading system to perform stress stretching until the pipeline steel sample to be tested breaks, including: Based on the driving device, driving the stretching device according to the control of the control system; Based on the stretching device, a tensile force is applied to the pipeline steel sample to be tested under the drive of the driving device to perform stress stretching until the pipeline steel sample to be tested breaks.

15. The method for testing hydrogen embrittlement sensitivity of pipeline steel according to claim 12, characterized in that: The method further comprises: Based on the loading system, the tensile force applied to the pipeline steel sample to be tested, as well as the strain rate and loading rate during the tensile process are adjusted in real time.

16. The method for testing hydrogen embrittlement sensitivity of pipeline steel according to claim 12, characterized in that: The hydrogen embrittlement sensitivity evaluation data include: elongation at break, tensile force at break, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index; the evaluation data measurement system includes: a displacement measurement system and a mechanical property measurement system; based on the evaluation data measurement system, the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when fracture occurs is measured under different hydrogen partial pressure and temperature conditions, including: Based on the displacement measurement system, the elongation of the pipeline steel sample to be tested during the stretching process is measured, and the elongation at break is calculated according to the elongation of the pipeline steel sample to be tested when it breaks, and the deformation of the pipeline steel sample to be tested is recorded; At the same time, based on the mechanical property measurement system, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested are monitored and recorded when the sample breaks.

17. The method for testing hydrogen embrittlement sensitivity of pipeline steel according to claim 16, characterized in that: The mechanical property measurement system includes: a force sensor and a data acquisition system; based on the mechanical property measurement system, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when fracture occurs are monitored and recorded, including: Based on the force sensor, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index are monitored in real time; based on the data acquisition system, the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index are collected.

18. The method for testing hydrogen embrittlement sensitivity of pipeline steel according to claim 12, characterized in that: Before controlling the hydrogen supply system, the loading system and the evaluation data measurement system based on the control system, the method further includes: Based on the control system, test parameters for the pipeline steel hydrogen embrittlement sensitivity test are set.

19. The method for testing hydrogen embrittlement sensitivity of pipeline steel according to any one of claims 12 to 18, characterized in that: The testing device also includes a hydrogen emission safety protection system; the method also includes: Based on the hydrogen emission safety protection system, the emission and circulation of hydrogen are controlled according to the control system.

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