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Method for avoiding abnormal fractures of X90/X100 pipeline steel drop hammer sample

A technology of X90 and pipeline steel, which is applied in the direction of testing the strength of materials with a single impact force, to avoid abnormal fractures, increase the speed of crack propagation, and eliminate abnormal fractures.

Active Publication Date: 2019-05-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For X90 / X100 steel pipes, due to the further improvement of its smelting process and purity, even in the case of thin wall thickness (below 21.4mm) and low toughness (below 300J), there will still be a large number of abnormal fractures

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  • Method for avoiding abnormal fractures of X90/X100 pipeline steel drop hammer sample
  • Method for avoiding abnormal fractures of X90/X100 pipeline steel drop hammer sample
  • Method for avoiding abnormal fractures of X90/X100 pipeline steel drop hammer sample

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Embodiment Construction

[0035] The invention provides a method for avoiding the abnormal fracture of the X90 / X100 pipeline steel drop weight sample. Firstly, the ordinary DWTT sample is processed according to the general standard, and then the initial crack is prefabricated at the root of the sample gap, and a back groove is added on the back of the sample. , increase the hammering energy during the DWTT test to ensure that the fracture morphology of the X90 / X100 steel pipe DWTT sample is a normal fracture.

[0036] The invention discloses a method for avoiding abnormal fractures of X90 / X100 pipeline steel drop hammer samples, comprising the following steps:

[0037] S1, DWTT sample processing

[0038] According to Q / SY GJX 101 "General Technical Conditions for Gas Transmission Steel Pipes", cut out the standard DWTT sample 1 (305mm in length, 76.2mm in width, and the wall thickness is the original wall thickness of the steel pipe), and press it with a special tool with a cutting edge angle of 45° T...

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Abstract

The invention discloses a method for avoiding abnormal fractures of an X90 / X100 pipeline steel drop hammer sample. The method comprises the following steps: processing a DWTT sample according to a general standard, prefabricating a crack at the notch root of the DWTT sample, adding a back groove in the back of the DWTT sample to ensure that the fracture morphology of the X90 / X100 steel pipe DWTT sample is a normal fracture, and carrying out a DWTT test. The DWTT sample prepared by the method has the characteristics of brittleness first and toughness second, and can effectively eliminate abnormal fractures.

Description

technical field [0001] The invention belongs to the technical field of material toughness testing, and in particular relates to a method for avoiding abnormal fractures of X90 / X100 pipeline steel drop hammer samples. Background technique [0002] Natural gas is a kind of clean energy, and it is also a flammable and explosive dangerous medium. Once the high-pressure natural gas pipeline cracks for a long time, it will cause huge disasters and losses. Therefore, the safety of the pipeline must be guaranteed. In order to improve the economics of pipeline transportation, the development trend of natural gas pipelines is to develop in the direction of high-grade steel (high-strength grade). Since 2000, Canada has taken the lead in carrying out the full-scale blasting test of the X100 pipeline in the world, and built the X100 test section. Since 2012, PetroChina has set up a major special project of "Research on Key Technologies of the Third-Generation Large-Transportation Natura...

Claims

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Application Information

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IPC IPC(8): G01N3/30
Inventor 李鹤池强封辉陈宏达邵晓东章传国黄卫锋
Owner BC P INC CHINA NAT PETROLEUM CORP
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