Test method and evaluation method for hydrogen-induced cracking of small-diameter thin-walled pipes

An evaluation method and technology for thin-walled tubes, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as very sensitive crack thickness rate, obvious differences in crack geometric dimensions, and no unified regulations on the definition of crack length and thickness. , to achieve the effect of expanding the scope of inspection and improving the possibility of finding cracks

Active Publication Date: 2021-11-23
HEFEI GENERAL MACHINERY RES INST +1
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Problems solved by technology

Irregular cracks are closely related to the placement of the sample in the measurement of geometric dimensions. The same crack, observed from different angles, shows obvious differences in the geometric dimensions of cracks, and thin-walled pipes are very sensitive to the crack thickness ratio. The definition of crack length and thickness will affect the judgment of the final result, but there is currently no uniform regulation for the definition of hydrogen-induced cracking crack length and thickness of small-diameter thin-walled pipes for reference and implementation

Method used

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  • Test method and evaluation method for hydrogen-induced cracking of small-diameter thin-walled pipes
  • Test method and evaluation method for hydrogen-induced cracking of small-diameter thin-walled pipes
  • Test method and evaluation method for hydrogen-induced cracking of small-diameter thin-walled pipes

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Embodiment 1

[0034] The test method for hydrogen-induced cracking of small-diameter thin-walled pipes includes the following steps:

[0035] S1. The small-diameter thin-walled pipe is treated with the outer wall 101 and the inner wall 103 to remove the oxide layer or rust layer, to ensure the set wall thickness of the small-diameter thin-walled pipe, and then cut into three rings with a unit length of 100±1mm along the length direction. The pipe section is used as the original sample pipe; the three samples are respectively labeled as 10(HSC)-HIC-11, 10(HSC)-HIC-12, and 10(HSC)-HIC-13.

[0036] In the scheme, the small-diameter thin-walled pipe adopts 10 (HSC) steel pipe resistant to hydrogen sulfide corrosion. The specification is Φ25*2.5mm. After the inner wall 103 and the outer wall 101 are finished, a pipe section of 100±1 mm is cut, and the length direction is along the rolling direction of the steel pipe. Use 320# sandpaper to grind the surface of the sample in one direction to for...

Embodiment 2

[0066] The difference from Example 1 is that the sample in this example is a circular weld sample 21 . When obtaining the metallographic inspection surface, such as figure 2 As shown, the girth weld sample 21 is divided into three equal sections in the length direction to form three weld sample sub-sections, and the equal section is the sample section 213; each weld sample sub-section is parallel to the axially cut The upper surface is used as the metallographic inspection surface 212 , that is, three metallographic inspection surfaces 212 are obtained. The distance from each metallographic inspection surface 212 to the upper surface of the corresponding weld sample subsection is different. In this embodiment, the distances from the metallographic inspection surface 212 to the upper surface of the corresponding weld sample subsection are D / 4, D / 2, 3D / 4. A total of 9 inspection surfaces were obtained for the three samples, which were respectively labeled as 111, 112, 113, 1...

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Abstract

A test method and evaluation method for hydrogen-induced cracking of small-diameter thin-walled pipes. The test method includes the following steps: S1. Small-diameter thin-walled pipes are cut along the length direction into several ring-shaped pipe sections as original pipes; S2. Before the test, each The geometric dimensions of the original sample tube, and perform degreasing treatment; S3, place the original sample tube in the sample container, and fix the original sample tube; S4, perform test treatment on the sample in the test container, and record the sample The surface condition of the original pipe after test treatment; S5, obtain the metallographic surface; S6, mark each crack and calculate the crack rate. The invention solves the problems that it is difficult to make samples and metallographic inspection surfaces; it clarifies the identification method of hydrogen-induced cracking cracks and the crack size measurement method of small-diameter thin-walled steel pipes; the steel pipes that are not within the scope of application of the standard refer to the present invention The test method is used for testing and crack statistics, so that it is applicable to the existing standard evaluation system.

Description

technical field [0001] The invention relates to the field of material detection, in particular to a test method and evaluation method for hydrogen-induced cracking of small-diameter thin-walled pipes. Background technique [0002] With the rapid development of the national economy, the demand for energy is increasing, and the country's requirements for environmental protection are also getting higher and higher. The energy structure has gradually changed, and the consumption of oil and natural gas has increased year by year. Trends in major energy sources. As the main transportation carrier of oil and natural gas resources, the use of pipeline steel is increasing year by year. However, with the development of oil and gas fields and the continuous increase in the processing of imported high-sulfur crude oil, the corrosion damage of hydrogen sulfide medium has penetrated into the drilling, transportation and production of oil and natural gas. processing industry. More and mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 张强陈学东范志超孔韦海胡盼万章刘燕
Owner HEFEI GENERAL MACHINERY RES INST
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