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Method and apparatus for testing fracture toughness of pipeline steel in hydrogen-containing synthetic natural gas environment

A coal-to-natural gas and fracture toughness technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of inability to respond to service conditions, waste of pipeline steel performance, and fast hydrogen diffusion, and achieve accurate and accurate experimental results. Reliable, easy-to-operate results

Inactive Publication Date: 2018-04-27
CHINA UNIV OF PETROLEUM (BEIJING) +1
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Problems solved by technology

Existing evaluation techniques for the fracture toughness of pipeline steel in coal-to-natural gas often use electrochemical hydrogen filling technology and autoclave hydrogen filling technology to test the fracture toughness after the pipeline steel contains a certain amount of hydrogen, but the diffusion of hydrogen is extremely fast, and It cannot reflect the actual service conditions, resulting in great dispersion of test results, causing great waste or underestimation of the performance of pipeline steel

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  • Method and apparatus for testing fracture toughness of pipeline steel in hydrogen-containing synthetic natural gas environment
  • Method and apparatus for testing fracture toughness of pipeline steel in hydrogen-containing synthetic natural gas environment
  • Method and apparatus for testing fracture toughness of pipeline steel in hydrogen-containing synthetic natural gas environment

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Embodiment 1

[0053] This embodiment provides a test device for the fracture toughness of pipeline steel in the hydrogen-containing coal-to-natural gas environment, and its structure is as follows figure 1 As shown, the test device includes: test equipment and environmental chamber;

[0054] Wherein, the test equipment includes a fatigue testing machine 1 and an extensometer test assembly;

[0055] The environmental box is provided with an air inlet connection port 4, a pressure gauge connection port 5, an extensometer connection port 7, a vacuum pump connection port 10, a first gas outlet 12 and a second gas outlet 13;

[0056] The main material of the environmental chamber of the environmental chamber is 316L, which is fixed in the fatigue testing machine 1, and the fatigue testing machine is fixed on the testing machine frame 3;

[0057] The crack opening displacement extensometer 6 is arranged inside the environmental box, and the signal of the crack opening displacement extensometer 6...

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Abstract

The invention provides a method and an apparatus for testing fracture toughness of pipeline steel in a hydrogen-containing synthetic natural gas environment. The testing method comprises the followingsteps: initial cracks are prefabricated in air; under a condition environment, a stretching test is carried out, in order to obtain a test crack expansion amount; a curve of J-integration-test crackpropagation amount is drafted, in order to complete test of the fracture toughness of pipeline steel in the hydrogen-containing synthetic natural gas environment. The invention also provides the testing apparatus of the testing method. The testing apparatus and the testing method can be used for practically reflecting practical service performance of the pipeline steel, and the apparatus and the method have the advantages of simple and easy operation, accurate result, and reliability.

Description

technical field [0001] The invention relates to a testing device and a method for fracture toughness of materials in a coal-to-natural gas environment, and belongs to the technical field of fracture toughness measurement. Background technique [0002] As the strength level of pipeline steel increases, the requirements for strength and toughness also increase. However, when high-strength pipeline steel serves in a hydrogen-containing environment, the probability of cracks caused by gaseous hydrogen is greatly increased. Accurate evaluation of fracture toughness in hydrogen medium is of great significance to the safe operation of pipeline steel. [0003] The hydrogen content in coal-to-gas (combustible component gas obtained by desulfurization and purification after pressurized gasification of coal as raw material) is 2%-5% of the total pressure (12MPa) of coal-to-gas. Existing evaluation techniques for the fracture toughness of pipeline steel in coal-to-natural gas often use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/10
Inventor 郑树启安腾张帅李树杰宋卫臣姜志阳辛萌付国强
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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