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Method for preparing specimens used in testing of mechanical properties of thin-walled and small-diameter petroleum and natural gas pipelines

A technology for oil and gas sample preparation, which is applied in the field of preparation of oil and gas thin-walled small-diameter pipeline mechanical performance samples, which can solve the problems that it is difficult to meet the sample size requirements such as tensile, impact, fracture toughness, and crack growth rate. , to achieve the effect of saving materials and improving utilization

Active Publication Date: 2014-06-25
湖州双林建设发展有限公司
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Problems solved by technology

[0003] When testing and evaluating the mechanical properties of oil and gas thin-walled small-diameter pipelines, the size of the samples taken from the pipelines is difficult to meet the requirements of tensile, impact, fracture toughness, crack growth rate and other sample sizes in the mechanical performance test standards.

Method used

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  • Method for preparing specimens used in testing of mechanical properties of thin-walled and small-diameter petroleum and natural gas pipelines
  • Method for preparing specimens used in testing of mechanical properties of thin-walled and small-diameter petroleum and natural gas pipelines
  • Method for preparing specimens used in testing of mechanical properties of thin-walled and small-diameter petroleum and natural gas pipelines

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Embodiment Construction

[0053] The present invention will be further described in detail below in conjunction with specific embodiments.

[0054] This embodiment detects the in-service natural gas pipeline of PetroChina Changqing Oilfield Gas Production No. 1 Plant: the material is 20# steel, and the pipeline size is φ114mm×6mm. Tensile, impact, CTOD fracture toughness and crack growth rate tests are required. The specific implementation steps of sample preparation include:

[0055] (1) Cut the sample in the circumferential direction of the pipeline to be tested, and the size is: 150mm×20mm×5mm.

[0056] (2) Laser deep penetration welding to widen the sample. Select welding material Q-235, the size is: 120mm×75mm×6mm. Grind and polish the surface of both sides of the material to be laser welded, and use a laser welder: YLS-4000 to perform laser welding on 20# steel and Q-235 with similar tensile strength. The prepared mechanical properties samples were as 4a- Figure 7b shown.

[0057] Determin...

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Abstract

The present invention discloses a method for preparing specimens used in testing mechanical properties of thin-walled and small-diameter petroleum and natural gas pipelines, which comprises the following steps: (1) cutting specimens having width of W mm and thickness of B mm from the circumferential direction of thin-walled and small-diameter petroleum and natural gas pipelines to be tested; and (2) carrying out laser welding on two lengthening blocks on both sides of specimens to obtain test specimens, wherein the width of the lengthening block is L, the thickness of the lengthening block is larger than or equal to B, the sum of L, W and L is greater than or equal to the minimum length of the test specimens required for testing the tensile, impact, CTOD (crack tip opening displacement) fracture toughness or crack propagation rate. Mechanical properties data, which are uneasily acquired by conventional methods, can be measured by virtue of the method disclosed by the invention and have an important practical significance on improvement of the safety evaluation of petroleum and natural gas pipelines. The laser penetration fusion welding technology is applied in preparation of small specimens to effectively increase the utilization rate of specimens, thereby saving materials, saving energy and reducing consumption. The method disclosed by the invention has a nature of green manufacture.

Description

【Technical field】 [0001] The invention belongs to the field of material mechanical performance testing, and relates to a method for preparing a mechanical performance sample of oil and gas thin-walled small-diameter pipelines. 【Background technique】 [0002] With the rapid development of the oil and gas industry, more and more pipelines are spread in every corner of the town. However, once a gas pipeline leaks, oil and gas are easily ignited, causing explosions and fires, accompanied by poisoning and environmental pollution, posing serious safety hazards. Accidents are often caused by pipeline defects, welding defects, corrosion and external force damage. According to statistics, in recent years, the average accident rate of gas pipelines in European and American countries is 0.5, while the accident rate of 12 gas pipelines in Sichuan in my country is as high as 4.3. At present, the length of my country's gas pipelines has exceeded 30,000 kilometers, and some long-distance...

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Application Information

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IPC IPC(8): G01N1/28
Inventor 张建勋李喆朱彤李振岗周涛魏文澜张兴军
Owner 湖州双林建设发展有限公司
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