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Method and device for determining sample toughness in pipeline steel drop weight tear test

A technology of falling weight tearing and pipeline steel, which is applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve the problem of shear area ratio deviation and achieve the effect of improving accuracy

Inactive Publication Date: 2014-10-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the drop weight tearing test of pipeline steel, a ductile-brittle mixed zone often appears on the fracture surface (generally presented as a triangular zone with a ductile-brittle mixed morphology, such as figure 1 Regions 1 and 2 in ), in the prior art, the entire ductile-brittle mixed region is generally treated as a brittle surface or a ductile surface, however, this approach will lead to a large deviation in the final shear area ratio

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  • Method and device for determining sample toughness in pipeline steel drop weight tear test
  • Method and device for determining sample toughness in pipeline steel drop weight tear test
  • Method and device for determining sample toughness in pipeline steel drop weight tear test

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Embodiment 1

[0044] The embodiment of the present invention provides a method for determining the toughness of a sample in a pipeline steel drop weight tearing test, such as figure 2 As shown, the processing flow of the method may include the following steps:

[0045] Step 201, in the region to be evaluated on the fracture surface of the pipeline steel sample, determine the area of ​​the ductile surface in the ductile-brittle mixed region, and determine the area of ​​the ductile surface in the non-ductile-brittle mixed region. Wherein, the ductile-brittle mixed region is a triangular-like region in which the tough surface and the brittle surface are distributed in stripes at intervals.

[0046] Step 202, according to the area of ​​the tough surface in the ductile-brittle mixed region in the region to be evaluated, the area of ​​the ductile surface in the non-ductile and brittle mixed region in the region to be evaluated, and the total area of ​​the region to be evaluated, determine the sh...

Embodiment 2

[0049] The embodiment of the present invention provides a method for determining the toughness of a sample in a pipeline steel drop weight tearing test, which will be described in conjunction with specific implementation methods below figure 2 The processing flow shown will be described in detail, and the specific content may be as follows.

[0050] Step 201, in the region to be evaluated on the fracture surface of the pipeline steel sample, determine the area of ​​the ductile surface in the ductile-brittle mixed region, and determine the area of ​​the ductile surface in the non-ductile-brittle mixed region.

[0051] Among them, X80 (pipeline steel type) pipeline steel can be used for 0°C pipeline steel drop weight tearing test. The area to be evaluated can be as figure 1 The region where the middle width of the fracture surface of the pipeline steel sample is taken is 33mm. The ductile-brittle mixed region in the area to be evaluated is figure 1 Areas 1, 2 in . The non-d...

Embodiment 3

[0067] Based on the same technical idea, the embodiment of the present invention also provides a device for determining the toughness of a sample in a pipeline steel drop weight tear test, such as Figure 6 As shown, the device includes:

[0068] The first determination module 610 is used to determine the area of ​​the ductile surface in the ductile-brittle mixed region and determine the area of ​​the ductile surface in the non-ductile-brittle mixed region in the area to be evaluated on the fracture surface of the pipeline steel sample, wherein the ductile The brittle mixed area is a triangular area in which the ductile surface and the brittle surface are distributed in stripes at intervals;

[0069] The second determining module 620 is used for determining the area of ​​the tough surface in the ductile-brittle mixed region in the region to be evaluated and the area of ​​the ductile surface in the non-ductile and brittle mixed region in the region to be evaluated, and the area...

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Abstract

The invention discloses a method and a device for determining sample toughness in a pipeline steel drop weight tear test, belonging to the field of pipeline steel judgment. The method comprises the following steps: determining the area of a tough surface in a tough-brittle mixing area in a to-be-evaluated area of the fracture surface of a pipeline steel sample, and determining the area of a tough surface in a non-tough-brittle mixing area, wherein the tough-brittle mixing area is a triangular-like area in which the tough surface and the brittle surface are distributed in a stripe shape at intervals; and determining the shear area ratio in the to-be-evaluated area according to the area of the tough surface in the tough-brittle mixing area in the to-be-evaluated area, the area of the tough surface in the non-tough-brittle mixing area in the to-be-evaluated area and the total area of the to-be-evaluated area. With the adoption of the method and the device, the accuracy of the shear area ratio obtained in the pipeline steel drop weight tear test can be improved.

Description

technical field [0001] The invention relates to the field of evaluation of pipeline steel, in particular to a method and equipment for determining the toughness of a sample in a drop weight tearing test of pipeline steel. Background technique [0002] With the development of science and technology, the requirements for the toughness of steel are constantly increasing in some engineering applications. In the Second West-East Gas Pipeline Project, in order to improve the safety index of the pipeline, the toughness requirements for the pipeline steel used to manufacture the pipeline are very high. [0003] In the prior art, the toughness of the pipeline steel is evaluated by the pipeline steel drop hammer tearing test. In the experiment, the pipeline steel sample is fractured by the drop hammer, and then the fracture surface of the sample is analyzed to determine the toughness of the sample. The fracture surface generally includes a brittle surface ( figure 1 in region 3) and...

Claims

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Application Information

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IPC IPC(8): G01N3/00
Inventor 宫少涛吉玲康赵新伟李为卫陈宏远熊庆人池强
Owner BC P INC CHINA NAT PETROLEUM CORP
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