Device and method for testing hydrogen embrittlement susceptibility of pipeline steels

Abstract

The application provides a pipeline steel hydrogen embrittlement sensitivity test device and method, and belongs to the technical field of material mechanical property testing. 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 the hydrogen concentration is controlled within a preset concentration range; a loading system is used for applying a tensile force to a pipeline steel sample to be tested, performing stress stretching, and until the pipeline steel sample to be tested is fractured; an evaluation data measurement system is used for measuring hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when the pipeline steel sample to be tested is fractured under different hydrogen partial pressures and different temperature conditions; a control system is used for controlling the hydrogen supply system, the loading system and the evaluation data measurement system, monitoring the test process and recording the hydrogen embrittlement sensitivity evaluation data, and establishing a hydrogen embrittlement sensitivity evaluation database of the pipeline steel sample. The application scheme can improve the reliability and applicability of the pipeline steel hydrogen embrittlement sensitivity test.

Description

TECHNICAL FIELD

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

[0002] Pipeline steel is the core material for long-distance transportation of oil and natural gas, and its mechanical properties and use reliability are crucial for the safe operation of the pipeline. However, in actual service, especially in high pressure, high temperature and hydrogen environment, pipeline steel faces serious hydrogen embrittlement problem.

[0003] At present, most of the existing hydrogen embrittlement testing 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 testing methods can reflect part of the hydrogen embrittlement behavior, due to the difference between the testing conditions and the actual application environment, the reliability and applicability of the test results are limited. Therefore, it is impossible to accurately evaluate the hydrogen embrittlement sensitivity of pipeline steel in complex environment, and it is also impossible to 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 a problem to be solved. SUMMARY

[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, the embodiments of the present application provide a pipeline steel hydrogen embrittlement sensitivity testing device, which comprises:

[0007] A hydrogen supply system for charging hydrogen gas with different preset hydrogen partial pressures into a hydrogen-doped sealed cabin and controlling the hydrogen concentration within a preset concentration range; the pipeline steel sample to be tested is placed in the hydrogen-doped sealed cabin;

[0008] A loading system for applying tensile force to the pipeline steel sample to be tested for stress stretching until the pipeline steel sample to be tested breaks;

[0009] An evaluation data measurement system for measuring the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when it breaks under different hydrogen partial pressures and different temperature conditions;

[0010] A control system for controlling the hydrogen supply system, the loading system and the evaluation data measurement system, monitoring the testing process and recording the hydrogen embrittlement sensitivity evaluation data, and establishing a hydrogen embrittlement sensitivity evaluation database of the pipeline steel sample;

[0011] The hydrogen embrittlement sensitivity evaluation database is used to evaluate the hydrogen embrittlement sensitivity of the pipeline steel sample.

[0012] In a possible implementation of the first aspect, the hydrogen supply system comprises 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 the hydrogen; the flow controller is used to control the flow of the hydrogen filled into the hydrogen-doped sealed cabin; and the pipeline system is used to deliver the hydrogen from the hydrogen cylinder to the hydrogen-doped sealed cabin.

[0013] In a possible implementation of the first aspect, the loading system is further configured to adjust the tensile force applied to the pipeline steel sample to be tested, the strain rate, and the loading rate in real time.

[0014] In a possible implementation of the first aspect, the loading system comprises a driving device and a stretching device; the driving device is configured to drive the stretching device based on the control of the control system; and the stretching device is configured to apply the tensile force to the pipeline steel sample to be tested under the driving of the driving device, perform stress stretching, and break the pipeline steel sample to be tested.

[0015] In a possible implementation of the first aspect, the hydrogen embrittlement sensitivity evaluation data comprises a fracture elongation, a fracture tensile force, a fracture stress, a fracture toughness index, and a hydrogen embrittlement sensitivity index; and the evaluation data measurement system comprises a displacement measurement system and a mechanical property measurement system.

[0016] The displacement measurement system is configured to measure the elongation of the pipeline steel sample to be tested in the stretching process, calculate the fracture elongation based on the elongation of the pipeline steel sample to be tested when the pipeline steel sample to be tested breaks, and record the deformation of the pipeline steel sample to be tested; and the mechanical property measurement system is configured to monitor and record the fracture tensile force, the fracture stress, the fracture toughness index, and the hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when the pipeline steel sample to be tested breaks.

[0017] In a possible implementation of the first aspect, the displacement measurement system comprises an extensometer or an optical displacement sensor; and the mechanical property measurement system comprises a force sensor and a data acquisition system; the force sensor is configured to monitor the fracture tensile force, the fracture stress, the fracture toughness index, and the hydrogen embrittlement sensitivity index in real time; and the data acquisition system is configured to acquire the fracture tensile force, the fracture stress, the fracture toughness index, and the hydrogen embrittlement sensitivity index.

[0018] In a possible implementation of the first aspect, the control system is further configured to set test parameters of the pipeline steel hydrogen embrittlement sensitivity test.

[0019] In a possible implementation of the first aspect, the test device further comprises a main rack structure, an induction heating furnace, a sample clamping device, a hydrogen-doped sealed cabin, and a hydrogen discharge safety protection system.

[0020] The main rack structure is used for supporting and fixing the testing device; the induction heating furnace is used for heating the pipeline steel sample to be tested to different preset temperatures based on the control of the control system; the sample clamping device is used for fixing the pipeline steel sample to be tested; the hydrogen-doped sealed cabin is used for accommodating the hydrogen-doped gas and placing the pipeline steel sample to be tested; and the hydrogen discharge safety protection system is used for controlling the discharge and circulation of hydrogen based on the control system.

[0021] In a possible implementation of the first aspect, the temperature range of the induction heating furnace is room temperature to 100 ℃, the preset temperature is between room temperature and 100 ℃, and the temperature control accuracy is ±1 ℃.

[0022] In a possible implementation of the first aspect, the hydrogen discharge safety protection system comprises a safety valve, a pressure relief device, and a gas monitor.

[0023] The safety valve is used for controlling the hydrogen partial pressure of the hydrogen-doped sealed cabin to be less than a preset value; the pressure relief device is used for discharging a preset amount of hydrogen to reduce the hydrogen partial pressure of the hydrogen-doped sealed cabin; and the gas monitor is used for monitoring the hydrogen-doped gas in the hydrogen-doped sealed cabin.

[0024] In a possible implementation of the first aspect, the preset hydrogen partial pressure of the hydrogen supply system ranges from 0.1 MPa to 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.

[0025] In the second aspect, the embodiments of the present application provide a pipeline steel hydrogen embrittlement sensitivity test method, which is implemented based on the pipeline steel hydrogen embrittlement sensitivity test device of any one of the first aspect; the method comprises the following steps.

[0026] 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 a preset concentration range; and the pipeline steel sample to be tested is placed in the hydrogen-doped sealed cabin.

[0027] Based on the loading system, a tensile force is applied to the pipeline steel sample to be tested for stress stretching until the pipeline steel sample to be tested is broken;

[0028] Based on the evaluation data measurement system, hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when broken are measured under different hydrogen partial pressures and temperature conditions;

[0029] 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 are recorded, and a hydrogen embrittlement sensitivity evaluation database of the pipeline steel sample is established.

[0030] The hydrogen embrittlement sensitivity evaluation database is used for evaluating the hydrogen embrittlement sensitivity of the pipeline steel sample.

[0031] In a possible implementation of the second aspect, the testing device further comprises an induction heating furnace, a sample clamping device, and a hydrogen-doped sealed cabin; before the hydrogen gas supply system fills the hydrogen-doped sealed cabin with hydrogen gas at different preset hydrogen partial pressures, the method further comprises:

[0032] placing the pipeline steel sample to be tested in the hydrogen-doped sealed cabin and fixing the pipeline steel sample to be tested based on the sample clamping device; starting the induction heating furnace based on the control system to heat the pipeline steel sample to be tested to different preset temperatures.

[0033] In a possible implementation of the second aspect, the loading system comprises a driving device and a stretching device; the pipeline steel sample to be tested is subjected to stress stretching by applying a stretching force based on the loading system until the pipeline steel sample to be tested is broken, comprising:

[0034] the stretching device is driven based on the driving device according to the control of the control system; the pipeline steel sample to be tested is subjected to stress stretching by applying a stretching force based on the stretching device under the driving of the driving device until the pipeline steel sample to be tested is broken.

[0035] In a possible implementation of the second aspect, the method further comprises adjusting the stretching force applied to the pipeline steel sample to be tested, and the strain rate and loading rate during the stretching in real time based on the loading system.

[0036] In a possible implementation of the second aspect, the hydrogen embrittlement sensitivity evaluation data comprises a fracture elongation, a fracture tensile force, a fracture stress, a fracture toughness index, and a hydrogen embrittlement sensitivity index; the evaluation data measurement system comprises a displacement measurement system and a mechanical property measurement system; the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when broken is measured under different hydrogen partial pressures and temperature conditions based on the evaluation data measurement system, comprising:

[0037] the elongation of the pipeline steel sample to be tested during the stretching is measured based on the displacement measurement system, the fracture elongation is calculated according to the elongation of the pipeline steel sample to be tested when broken, and the deformation of the pipeline steel sample to be tested is recorded; at the same time, the fracture tensile force, the fracture stress, the fracture toughness index, and the hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when broken are monitored and recorded based on the mechanical property measurement system.

[0038] In a possible implementation of the second aspect, the mechanical property measurement system comprises a force sensor and a data acquisition system; the fracture tensile force, the fracture stress, the fracture toughness index, and the hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when broken are monitored and recorded based on the mechanical property measurement system, comprising:

[0039] The fracture tensile force, the fracture stress, the fracture toughness index and the hydrogen embrittlement sensitivity index are monitored in real time based on the force sensor; and the fracture tensile force, the fracture stress, the fracture toughness index and the hydrogen embrittlement sensitivity index are collected based on the data collection system.

[0040] In a possible implementation of the second aspect, before the control system controls the hydrogen supply system, the loading system and the evaluation data measurement system, the method further includes: setting, by the control system, test parameters of the hydrogen embrittlement sensitivity test of the pipeline steel.

[0041] In a possible implementation of the second aspect, the test device further includes a hydrogen discharge safety protection system; and the method further includes: controlling, by the hydrogen discharge safety protection system, discharge and circulation of the hydrogen according to the control system.

[0042] According to the scheme, the hydrogen supply system fills the 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 pressures and temperatures, the control system monitors the test process and records the hydrogen embrittlement sensitivity evaluation data, and a hydrogen embrittlement sensitivity evaluation database for evaluating the hydrogen embrittlement sensitivity of the pipeline steel sample is established.

[0043] The scheme can measure the hydrogen embrittlement sensitivity evaluation data not only in a normal-temperature or low-pressure hydrogen environment but also in a high-temperature and high-pressure hydrogen environment, can accurately evaluate the hydrogen embrittlement sensitivity of the pipeline steel in a complex environment, improves the reliability and applicability of the hydrogen embrittlement sensitivity test of the pipeline steel, and has strong ease of use and practicality.

[0044] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0046] Figure 1 is a schematic diagram of the overall structure of the pipeline steel hydrogen embrittlement sensitivity test device provided by the embodiments of the present application;

[0047] Figure 2 is a schematic diagram of the structure of the pipeline steel sample to be tested provided by the embodiments of the present application;

[0048] Figure 3 is a specific structural schematic diagram of a pipeline steel hydrogen embrittlement sensitivity test device provided by an embodiment of the present application;

[0049] Figure 4 is a step schematic diagram of a pipeline steel hydrogen embrittlement sensitivity test method provided by an embodiment of the present application. DETAILED DESCRIPTION

[0050] In the following description, for the purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the embodiments of the application. However, it will be apparent to those skilled in the art that the application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the application.

[0051] It should be understood that the term "comprises" when used in this specification and accompanying claims, indicates the presence of the stated features, integers, steps, operations, elements, and / or components but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0052] It should also be understood that the terms used in the specification and the appended claims are intended to describe particular embodiments and do not intend to limit the present application. As used in the specification and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0053] It should further be understood that the term "and / or" as used in the specification and the appended claims, means any one or more of the associated listed items, as well as all possible combinations of the items.

[0054] As used in the specification and the appended claims, the term "if' can be construed to mean "when" or "once" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can be construed to mean "once it is determined" or "in response to determining" or "once [the described condition or event] is detected" or "in response to detecting [a described condition or event]," depending on the context.

[0055] In addition, in the description of the present application, the terms "first," "second," "third," etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0056] Reference to "one embodiment" or "some embodiments" or "one implementation" or "some implementations" or "one example" or "some examples" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment or implementation of the application. The appearances of the phrase "in one embodiment" or "in some embodiments" or "in one implementation" or "in some implementations" or "in one example" or "in some examples" in various places in the specification are not necessarily all referring to the same embodiment or implementation, but can refer to different embodiments or implementations, unless otherwise indicated.

[0057] Pipeline steels, as the core material for long-distance transportation of oil and natural gas, their mechanical properties and reliability of use are crucial for the safe operation of pipelines. However, in actual service, especially in high pressure, high temperature and hydrogen environment, pipeline steels face serious hydrogen embrittlement problems.

[0058] Hydrogen embrittlement phenomenon refers to the hydrogen gas permeating into the steel, which leads to a significant decrease in strength and toughness, thereby increasing the risk of brittle fracture of the material. This phenomenon is more prominent in high-pressure hydrogen environment, which may cause sudden pipe rupture accidents, seriously threatening the safety of energy transportation.

[0059] Currently, most existing hydrogen embrittlement test methods are carried out at room temperature or low pressure conditions, which cannot effectively simulate the actual service state of pipeline steels in high-temperature and high-pressure hydrogen environment. Although these traditional test methods can reflect some hydrogen embrittlement behaviors, due to the difference between the test conditions and the actual application environment, the reliability and applicability of the test results are limited. Therefore, it is impossible to accurately evaluate the hydrogen embrittlement sensitivity of pipeline steels in complex environments, nor can it provide strong technical support for pipeline design and material selection.

[0060] With the rapid development of hydrogen energy technology and the increasing application of hydrogen, the market and research field have put forward higher demands for test methods that can accurately control the hydrogen partial pressure under high temperature conditions and systematically study the hydrogen embrittlement behavior. Therefore, how to improve the reliability and applicability of the hydrogen embrittlement sensitivity test of pipeline steels has become a problem to be solved.

[0061] In view of the above defects, the embodiments of the present application provide a pipeline steel hydrogen embrittlement sensitivity test device and method. 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 pressures and temperature conditions, the control system monitors the test process and records the hydrogen embrittlement sensitivity evaluation data, and a hydrogen embrittlement sensitivity evaluation database for evaluating the hydrogen embrittlement sensitivity of the pipeline steel sample is established.

[0062] The hydrogen embrittlement sensitivity evaluation data can be measured in a high-temperature and high-pressure hydrogen environment, and the safety of the hydrogen-doped pipeline can be evaluated, the hydrogen embrittlement sensitivity of the pipeline steel in a complex environment can be accurately evaluated, the reliability and applicability of the hydrogen embrittlement sensitivity test of the pipeline steel are improved, and the hydrogen embrittlement sensitivity test of the pipeline steel has strong ease of use and practicality.

[0063] The advanced high-temperature control technology and the hydrogen supply system are integrated, the mechanical property change of the pipeline steel can be accurately measured in different hydrogen partial pressures and high-temperature environments, and a comprehensive hydrogen embrittlement sensitivity evaluation database is established. Not only the blank of the prior art is filled, but also scientific basis is provided for material selection and design of the pipeline steel, reliable data support is provided for pipeline design, and the safety and reliability of the pipeline system in a complex environment are improved.

[0064] The specific process implemented by the present application will be described below through specific embodiments.

[0065] Please refer to Figure 1 , Figure 1 is the overall structure schematic diagram of the pipeline steel hydrogen embrittlement sensitivity test device 100 provided by the present application. As Figure 1 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.

[0066] In some embodiments, the hydrogen supply system is used to fill hydrogen with different preset hydrogen partial pressures into the hydrogen-doped sealed cabin (hydrogen-filled sealed cabin), and control the hydrogen concentration within a preset concentration range. Wherein, 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.

[0067] Wherein, the preset hydrogen partial pressure and the preset concentration range can be determined according to the specific situation in the actual application scene, which is not limited here. In order to ensure safety, the hydrogen supply system needs strict sealing and explosion-proof design. In an embodiment, the structure schematic diagram of the pipeline steel sample to be tested is as shown in Figure 2 . Taking X52 pipeline steel as an example, it is made into a sample according to Figure 2 size and placed in the hydrogen-doped sealed cabin.

[0068] 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 is broken. In an embodiment, the loading system can slowly stretch the pipeline steel sample to be tested by slow stress stretching, and the stress of the pipeline steel sample to be tested slowly changes during the stretching process.

[0069] 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 fixed value, and the tensile force will change during the stretching of the pipeline steel sample to be tested.

[0070] In some embodiments, the evaluation data measurement system is used to measure the hydrogen embrittlement susceptibility evaluation data of the pipeline steel sample to be tested when the pipeline steel sample to be tested is broken under different hydrogen partial pressures and different temperature conditions, and the hydrogen embrittlement susceptibility evaluation data is input into the control system. A plurality of tests are performed under different hydrogen partial pressures and different temperature conditions to obtain the hydrogen embrittlement susceptibility evaluation data of the pipeline steel under different environmental conditions.

[0071] 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 susceptibility evaluation data, and establish a hydrogen embrittlement susceptibility evaluation database of the pipeline steel sample. The hydrogen embrittlement susceptibility evaluation database is used to evaluate the hydrogen embrittlement susceptibility of the pipeline steel sample.

[0072] Please refer to Figure 3 , Figure 3 is a specific structural schematic diagram of the pipeline steel hydrogen embrittlement susceptibility testing device provided by the embodiments of the present application. As Figure 3 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 the 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 deliver the hydrogen from the hydrogen cylinder to the hydrogen-doped sealed cabin.

[0073] The loading system needs to have high precision and controllability. According to an embodiment of the present application, the loading system is also used to adjust the tensile force applied to the pipeline steel sample to be tested in real time, and the strain rate and loading rate during the stretching process.

[0074] Please continue to refer to Figure 3 , according to an 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 tensile force to the pipeline steel sample to be tested under the driving of the driving device, perform stress stretching, and until the pipeline steel sample to be tested is broken. The driving device includes a servo motor or a hydraulic cylinder.

[0075] According to an embodiment of the present application, the hydrogen embrittlement susceptibility evaluation data includes elongation at break, tensile force at break, stress at break, toughness index at break and hydrogen embrittlement susceptibility index. Please continue to refer to Figure 3 , the evaluation data measurement system includes a displacement measurement system and a mechanical property measurement system.

[0076] The displacement measurement system is used to measure the elongation of the pipeline steel sample to be tested during the tensile process, calculate the fracture elongation based on the elongation of the pipeline steel sample to be tested when the fracture occurs, and accurately 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 fracture occurs.

[0077] Please continue to see Figure 3 According to an embodiment of the present application, the displacement measurement system comprises an extensometer or an optical displacement sensor. The mechanical property measurement system comprises 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, and the data acquisition system is used to acquire the fracture tensile force, fracture stress, fracture toughness index and hydrogen embrittlement sensitivity index.

[0078] According to an embodiment of the present application, the control system is also used to set the test parameters of the pipeline steel hydrogen embrittlement sensitivity test, such as hydrogen partial pressure, temperature, tensile force, stress, strain rate and loading rate.

[0079] Please continue to see Figure 3 According to an embodiment of the present application, the test device further comprises a main frame structure, an induction heating furnace, a sample clamping device, a hydrogen-doped sealed cabin and a hydrogen gas discharge safety protection system.

[0080] The main frame structure is used to support and fix the frame structure of the whole test device, and 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, which provides a device for heating the sample to a preset high temperature. The high-temperature furnace needs to control the temperature accurately and can maintain uniform temperature distribution.

[0081] The sample clamping device is used to fix the pipeline steel sample to be tested, which can be a clamp, and is usually required to be stable under high temperature and high pressure to avoid slipping or stress concentration. The hydrogen-doped sealed cabin is used to contain hydrogen-doped gas and place the pipeline steel sample to be tested, which can seal the hydrogen gas from leaking.

[0082] The hydrogen gas discharge safety protection system is used to control the discharge and circulation of hydrogen gas based on the control system, and prevent hydrogen gas from leaking during the test. It is a safety device that can ensure the safety of the operator and the stable operation of the equipment. After the test is completed, the hydrogen gas is discharged safely through the hydrogen gas discharge safety protection system.

[0083] According to an embodiment of the present application, the temperature range of the induction heating furnace is room temperature to 100 DEG C, and the preset temperature of the induction heating furnace for heating the pipeline steel sample to be tested is between room temperature and 100 DEG C. The temperature control accuracy is ± 1 DEG C, that is, the difference between the actual temperature of the induction heating furnace and the preset temperature is not more than 1 DEG C. In one embodiment, the induction heating furnace heats the pipeline steel sample to be tested to 40 DEG C.

[0084] Please continue to see Figure 3 According to an embodiment of the present application, the hydrogen discharge safety protection system comprises a safety valve, a pressure relief device, and a gas monitor.

[0085] The safety valve is used to control the hydrogen partial pressure of the hydrogen-doped sealed cabin to be not more than 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, and the gas monitor is used to monitor the hydrogen-doped gas of the hydrogen-doped sealed cabin.

[0086] According to an embodiment of the present application, the preset hydrogen partial pressure of the hydrogen supply system is 0.1-20 MPa. 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, and is kept constant to maintain a stable hydrogen environment. In one embodiment, the preset hydrogen partial pressure is 4 MPa.

[0087] Please see Figure 4 , Figure 4 is a schematic diagram of the steps of the pipeline steel hydrogen embrittlement sensitivity test method provided by the embodiments of the present application. The method is realized based on the pipeline steel hydrogen embrittlement sensitivity test device shown in Figure 1 may comprise the following steps:

[0088] S401, 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 a preset concentration range; the pipeline steel sample to be tested is placed in the hydrogen-doped sealed cabin.

[0089] It should be noted that the specific implementation principles of the present embodiment have been described in the above embodiments, and will not be described here.

[0090] According to an embodiment of the present application, the test device further comprises an induction heating furnace, a sample clamping device, and a hydrogen-doped sealed cabin. Before the hydrogen with different preset hydrogen partial pressures is filled into the hydrogen-doped sealed cabin based on the hydrogen supply system, the method can further comprise the following steps:

[0091] The pipeline steel sample to be tested is placed in the hydrogen-doped sealed cabin, and the pipeline steel sample to be tested is fixed based on the sample clamping device. Based on the control system, the induction heating furnace is started to heat the pipeline steel sample to be tested to different preset temperatures.

[0092] In one embodiment, the pipeline steel sample to be tested is placed in a hydrogen-doped sealed cabin, and the sample is clamped using a clamp. A high-temperature furnace is started to heat the sample, and the hydrogen-doped sealed cabin is filled with hydrogen gas at a preset pressure.

[0093] S402, based on the loading system, the tensile force is applied to the pipeline steel sample to be tested, stress stretching is performed until the pipeline steel sample to be tested is broken.

[0094] According to one embodiment of the present application, the loading system comprises a driving device and a stretching device. Based on the loading system, the tensile force is applied to the pipeline steel sample to be tested, stress stretching is performed until the pipeline steel sample to be tested is broken, which can include the following steps:

[0095] Based on the driving device, the stretching device is driven according to the control of the control system. Based on the stretching device, the tensile force is applied to the pipeline steel sample to be tested under the driving of the driving device, stress stretching is performed until the pipeline steel sample to be tested is broken.

[0096] According to one embodiment of the present application, the method can further include the following steps: based on the loading system, the tensile force applied to the pipeline steel sample to be tested is adjusted in real time, and the strain rate and loading rate during the stretching process.

[0097] It should be noted that the specific implementation principles of the present embodiment have been described in the above embodiments, which will not be described here.

[0098] S403, based on the evaluation data measurement system, the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested when it is broken is measured under different hydrogen partial pressures and temperature conditions.

[0099] According to one embodiment of the present application, the hydrogen embrittlement sensitivity evaluation data includes fracture elongation, fracture tensile force, 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 it is broken is measured under different hydrogen partial pressures and temperature conditions, which can include the following steps:

[0100] Based on the displacement measurement system, the elongation of the pipeline steel sample to be tested during the stretching process is measured, the fracture elongation is calculated according to the elongation of the pipeline steel sample to be tested when it is broken, 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 is broken are monitored and recorded.

[0101] According to an embodiment of the present application, the mechanical property measuring system comprises a force sensor and a data acquisition system. Based on the mechanical property measuring system, the fracture tensile force, the fracture stress, the fracture toughness index and the hydrogen embrittlement sensitivity index of the pipeline steel sample to be tested when the fracture occurs are monitored and recorded, which can include the following steps:

[0102] Based on the force sensor, the fracture tensile force, the fracture stress, the fracture toughness index and the hydrogen embrittlement sensitivity index are monitored in real time. Based on the data acquisition system, the fracture tensile force, the fracture stress, the fracture toughness index and the hydrogen embrittlement sensitivity index are collected.

[0103] It should be noted that the specific implementation principles of the present embodiment have been described in the above embodiments, and will not be repeated here.

[0104] S404, based on the control system, the hydrogen supply system, the loading system and the evaluation data measuring system are controlled, the test process is monitored and the hydrogen embrittlement sensitivity evaluation data is recorded, and the hydrogen embrittlement sensitivity evaluation database of the pipeline steel sample is established; wherein the hydrogen embrittlement sensitivity evaluation database is used to evaluate the hydrogen embrittlement sensitivity of the pipeline steel sample.

[0105] According to an embodiment of the present application, before the control system controls the hydrogen supply system, the loading system and the evaluation data measuring system, the method can further include the following steps: based on the control system, setting the test parameters of the pipeline steel hydrogen embrittlement sensitivity test.

[0106] According to an embodiment of the present application, the test device further comprises a hydrogen discharge safety protection system. The method can further include the following steps: based on the hydrogen discharge safety protection system, discharging and circulating the hydrogen according to the control system.

[0107] It should be noted that the specific implementation principles of the present embodiment have been described in the above embodiments, and will not be repeated here.

[0108] The pipeline steel hydrogen embrittlement sensitivity test device and method provided by the present application, 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 measuring system measures the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample to be tested under different hydrogen partial pressures and temperature conditions, the control system monitors the test process and records the hydrogen embrittlement sensitivity evaluation data, and establishes the hydrogen embrittlement sensitivity evaluation database for evaluating the hydrogen embrittlement sensitivity of the pipeline steel sample.

[0109] The hydrogen embrittlement sensitivity evaluation data can be measured in a high-temperature and high-pressure hydrogen environment, and the safety of the hydrogen-doped pipeline can be evaluated, the hydrogen embrittlement sensitivity of the pipeline steel in a complex environment can be accurately evaluated, the reliability and applicability of the hydrogen embrittlement sensitivity test of the pipeline steel are improved, and the method has strong ease of use and practicality.

[0110] The method can accurately measure the mechanical property changes of the pipeline steel under different hydrogen partial pressures and high-temperature environments by integrating advanced high-temperature control technology and a hydrogen supply system, and a comprehensive hydrogen embrittlement sensitivity evaluation database can be established. The method not only fills the gap in the prior art, but also provides a scientific basis for material selection and design of the pipeline steel, provides reliable data support for pipeline design, and helps to improve the safety and reliability of the pipeline system in a complex environment.

[0111] The method realizes testing of the hydrogen embrittlement sensitivity of the pipeline steel under different hydrogen partial pressures and high-temperature conditions, can simulate actual application scenarios, and evaluates the hydrogen embrittlement sensitivity of the pipeline steel under different hydrogen partial pressures under high-temperature conditions.

[0112] It should be understood that the size of the serial number of each step in the above embodiments does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the application.

[0113] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional units and module blocks is taken as an example for illustration, and in actual application, the above functions can be completed by different functional units and module blocks according to needs, that is, the internal structure of the device is divided into different functional units or module blocks to complete all or part of the functions described above. Each functional unit and module block in the embodiments can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module block are only for easy distinction, and do not limit the protection scope of the application. The specific working process of the unit and module block in the above system can be referred to the corresponding process in the foregoing method embodiments, which will not be described here.

[0114] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0115] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the technical solutions recorded in the above examples can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A device for testing the hydrogen embrittlement sensitivity of pipeline steel, characterized in that, The device includes: The hydrogen supply system is used to fill the hydrogen-doped sealed chamber with hydrogen at different preset hydrogen partial pressures and control the hydrogen concentration within a preset range; the pipeline steel sample to be tested is placed in the hydrogen-doped sealed chamber. The loading system is used to apply tensile force to the pipeline steel sample to be tested, and to perform stress tension until the pipeline steel sample to be tested breaks. The evaluation data measurement system is used to measure the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample under test when it fractures under different hydrogen partial pressures and different temperatures. The control system is 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. 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, characterized in that, The hydrogen supply system includes: hydrogen cylinders, pressure reducing valves, flow controllers, and piping systems; 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 rate of hydrogen entering the hydrogen-blended sealed chamber, and the pipeline system is used to transport hydrogen from the hydrogen cylinder to the hydrogen-blended sealed chamber.

3. The pipeline steel hydrogen embrittlement sensitivity testing device according to claim 1, characterized in that, The loading system is also used to adjust the tensile force applied to the pipeline steel specimen under test in real time, 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 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 tensile device is used to apply tensile force to the pipeline steel sample to be tested under the drive of the driving device, and to perform stress tensile testing 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 includes: elongation at break, tensile force at break, stress at break, 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 under test during the tensile process, calculate the elongation at break based on the elongation of the pipeline steel sample under test when it breaks, and record the deformation of the pipeline steel sample under test. 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 under test when it 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 the test parameters for the hydrogen embrittlement sensitivity test of pipeline steel.

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 chamber, and a hydrogen emission safety protection system. The main frame structure is used to support and fix the testing device; 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; and the sample clamping device is used to fix the pipeline steel sample to be tested. A hydrogen-doped sealed chamber is used to contain hydrogen-doped gas and place the steel sample of the pipeline 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 ℃, the preset temperature is between room temperature and 100 ℃, and the temperature control accuracy is ±1 ℃.

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; A safety valve is used to control the hydrogen partial pressure in the hydrogen-blended sealed chamber to not exceed a preset value; a pressure relief device is used to release a preset amount of hydrogen gas to reduce the hydrogen partial pressure in the hydrogen-blended sealed chamber; and a gas monitor is used to monitor the hydrogen-blended gas in the hydrogen-blended sealed chamber.

11. The pipeline steel hydrogen embrittlement sensitivity testing device according to any one of claims 1-10, 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 chamber is a constant value during the hydrogen embrittlement sensitivity test of the pipeline steel.

12. A method for testing the hydrogen embrittlement sensitivity of pipeline steel, characterized in that, The method is implemented based on the pipeline steel hydrogen embrittlement sensitivity testing device according to any one of claims 1-11; the method includes: Hydrogen gas with different preset hydrogen partial pressures is introduced into the hydrogen-doped sealed chamber through a 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 chamber. The loading system applies tensile force to the pipeline steel sample under test, and performs stress tension until the pipeline steel sample under test breaks. Based on the evaluation data measurement system, the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample under test was obtained under different hydrogen partial pressures and temperatures. The hydrogen supply system, loading system, and evaluation data measurement system are controlled by the control system to monitor the test process and record the hydrogen embrittlement sensitivity evaluation data, thereby establishing 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.

13. The method for testing the hydrogen embrittlement sensitivity of pipeline steel according to claim 12, characterized in that, The testing apparatus further includes: an induction heating furnace, a sample clamping device, and a hydrogen-doped sealed chamber; before filling the hydrogen-doped sealed chamber with hydrogen at 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 chamber and fixed using a sample clamping device. The control system controls the induction heating furnace to start, heating the pipeline steel sample to be tested to different preset temperatures.

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

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

16. The method for testing the hydrogen embrittlement sensitivity of pipeline steel according to claim 12, characterized in that, The hydrogen embrittlement sensitivity evaluation data includes: elongation at break, tensile force at break, stress at break, 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 under different hydrogen partial pressures and temperatures, the hydrogen embrittlement sensitivity evaluation data of the pipeline steel sample under test at the time of fracture is measured, including: Based on the displacement measurement system, the elongation of the pipeline steel sample under test during the tensile process is measured. Based on the elongation of the pipeline steel sample under test when it breaks, the elongation at break is calculated, and the deformation of the pipeline steel sample under test is recorded. Simultaneously, based on the aforementioned mechanical property measurement system, the fracture tensile force, fracture stress, fracture toughness index, and hydrogen embrittlement sensitivity index of the pipeline steel sample under test are monitored and recorded when fracture occurs.

17. The method for testing the 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, it monitors and records the fracture tensile force, fracture stress, fracture toughness index, and hydrogen embrittlement susceptibility index of the pipeline steel sample under test when it fractures, 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 the hydrogen embrittlement sensitivity of pipeline steel according to claim 12, characterized in that, Before controlling the hydrogen supply system, loading system, and evaluation data measurement system based on the control system, the method further includes: Based on the control system, test parameters for the hydrogen embrittlement sensitivity test of pipeline steel are set.

19. The method for testing the hydrogen embrittlement sensitivity of pipeline steel according to any one of claims 12-18, characterized in that, The testing apparatus also includes a hydrogen emission safety protection system; the method further 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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