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Reliable method for inspecting and researching HIC (hydrogen-induced cracking) sample cracks

A crack and reliable technology, which is applied in the preparation of test samples, material inspection products, test metals, etc., can solve the problems of inability to judge the source of cracks and ensure the reliability of HIC crack research, and achieve the effect of avoiding missed detection

Active Publication Date: 2018-05-04
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the entire crack morphology cannot be observed, and important features such as the crack source cannot be judged at the same time, the reliability of studying the mechanism of HIC cracks cannot be guaranteed.

Method used

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  • Reliable method for inspecting and researching HIC (hydrogen-induced cracking) sample cracks
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  • Reliable method for inspecting and researching HIC (hydrogen-induced cracking) sample cracks

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Experimental program
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Embodiment Construction

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0051] Taking X52MS acid-resistant pipeline steel as the detection object, the chemical composition of the test coil C: 0.05; Si: 0.24; Mn: 1.14; P: 0.009; S: 0.0008; Cr: ≤0.30; Cr+Cu: 0.29; Cr+Mo+Mn: 1.37; the rest is Fe, of which CEpcm: 0.19; Ceq: 0.30; the wall thickness of the steel pipe is 12mm. The HIC test procedure of the X52MS steel grade LSAW pipe in this embodiment is as follows:

[0052] 1. Processing HIC samples.

[0053] 1.1 Sample size;

[0054] It shall be 100 ± 1 mm long and 20 ± 1 mm wide, and the wall thickness of the specimen shall be the entire wall thickness of the pipe, up to 30 mm. A maximum of 1 mm is allowed to be removed from the inner and outer surfaces, and the specimen blank shall not be leveled. For small diameter, thin wall electric resistance welded pipe and seamless line pipe, the thickness of the test pie...

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Abstract

The invention relates to a reliable method for inspecting and researching HIC (hydrogen-induced cracking) sample cracks. The method comprises the main experiment procedures as follows: (1) processingof an HIC sample; (2) cleaning and storage of the sample; (3) sample soaking; (4) oxygen removal and H2S introduction; (5) pH value determination; (6) continuous testing for 96 h in an H2S saturated state; (7) taking out of the sample; (8) nondestructive testing; (9) sample cutting; (10) grinding, polishing and sample section cutting; (11) evaluation of the sample; (12) selection of an auxiliary welding part; (13) welding; (14) snapping; (15) removal of an auxiliary part; (16) cleaning of the cracked sample and measurement of the depth and width of the cracking surfaces under a metallurgic microscope; (17) deep research of the section. The morphology of the cracking surfaces, including cracking and extension processes, can be directly observed. Dyeing of primary cracking surfaces can be realized through the heating process in a welding technology, and primary cracking surfaces and secondary cracking surfaces can be distinguished. All cracking surfaces can be displayed, missing detection of cracks is avoided, and the morphology and size of the cracking surfaces can be reflected completely.

Description

technical field [0001] The invention relates to the field of material HIC (Hydrogen-Induced Cracking) testing, and belongs to the technical field of material testing. Background technique [0002] HIC has been associated with hydrogen bubbling since the 1940s through the handling of containers for acidic products. Shortly thereafter, pipeline steel HIC was also widely accepted as a potential problem. When steel is in a wet hydrogen sulfide environment, the corrosion effect of hydrogen absorption depends on the performance of the steel, environmental characteristics and other factors. One of the adverse effects on pipeline steel and pressure vessel steel is that it will produce cracks along the rolling direction. Planar cracks tend to connect cracks in adjacent layers, resulting in stepped cracks along the thickness. These cracks reduce the effective wall thickness until the pipeline steel or pressure vessel is overstressed in service or fails. Sometimes cracks appear simu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/20G01N1/28
CPCG01N1/28G01N33/20
Inventor 刘振伟孙鸣华孙宪进杨烽李曜余道军陈若进鲍雪君
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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