CN109883836A - A kind of pipe line steel magnetic force property detection method - Google Patents
A kind of pipe line steel magnetic force property detection method Download PDFInfo
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Abstract
The present invention provides a kind of pipe line steel magnetic force property detection method, step 1: design sample: the pipe line steel pole sample of multiple groups difference production batch is selected, every group is cut into five, is respectively used to five kinds of operating condition of test such as microstructure electron-microscope scanning, B-H loop measurement, magnetizing parameters determination, magnetic flux-tensile force test, magnetic flux-pressure stress test；Step 2: using card DMI3000M/DFC450 inverted metallurgic microscope is come, the micro- metallographic of microstructure microstructure observing: has been carried out into map analysis under the conditions of amplifying 200 times to test sample；Step 3: magnetization curve is drawn: at normal temperature, being loaded magnetic field with the rate of 100Oe/s, is obtained the corresponding relationship of magnetic field strength and magnetic moment, then inverse goes out B-H relation curve i.e. magnetization curve；Step 4: parameter is returned to magnetic hysteresis using Jiles Atherton model and carries out physical interpretation, and test measured data is combined to be modified, the intensity of magnetization is solved to the differential equation of rate of change of magnetic using Matlab software self-compiling program, establishes the magnetomechanics constitutive model of pipe line steel.
Description
Technical field
The invention belongs to pipe magnetic detection technique fields, and in particular to a kind of pipe line steel magnetic force property detection method.
Background technique
The shadow that natural gas line changes in construction, operation by complicated factors such as load, material, dielectric corrosion, environment
It rings, occurs different degrees of damage in service phase duct wall, lead to actual stress state and different design, it is even up to or super
Limiting design value is crossed, great engineering safety accident is caused, it is related studies have shown that the main needle of natural gas line detection technique both at home and abroad
Develop to etch pit, defect, residual wall thickness and leakage, and towards the direction of more Data Detections, currently, Magnetic Flux Leakage Inspecting technology and
Equipment in China's natural gas pipe detection field relative maturity, meanwhile, scholars have also carried out supersonic guide-wave, impulse eddy current, remote
The theoretical basis research of the detections such as field vortex, ray, electromagnetism and thermal imaging, health monitoring of the natural gas line in service phase are
The problem of academia's extensive concern, wherein the on-line checking of working stress is one of difficulties.Natural gas line steel is typical
Ferrimagnet, domestic and foreign scholars achieve more in defect of pipeline magnetic detecting technique and ferromagnetic material stress detection field
Achievement, but not specifically for common pipe line steel magnetomechanical effect and the research of application.
Summary of the invention
The present invention provides a kind of pipe line steel magnetic force property detection method, proposes magnetic coupling stress detection and is tried
Research is tested, the magnetomechanics constitutive model and application method of pipe line steel are established.
The technical scheme is that a kind of pipe line steel magnetic force property detection method,
Step 1: design sample: selecting the pipe line steel pole sample of multiple groups difference production batch, and every group is cut into five,
It is respectively used to microstructure electron-microscope scanning, B-H loop measurement, magnetizing parameters determination, magnetic flux-tensile force test, magnetic flux-
Five kinds of operating condition of test such as pressure stress test select the pipe line steel pole sample of different wall thickness, different-diameter to verify wall thickness, caliber pair
The influence of the increment changing rule of induced flux under different operating pressure；
Step 2: microstructure observing: using coming card DMI3000M/DFC450 inverted metallurgic microscope, to test sample,
Under the conditions of amplifying 200 times, the micro- metallographic of microstructure has been carried out into map analysis；
Step 3: magnetization curve is drawn: at normal temperature, being loaded magnetic field with the rate of 100Oe/s, is obtained magnetic field strength and magnetic
The corresponding relationship of square, then inverse goes out B-H relation curve i.e. magnetization curve；
Step 4: parameter is returned to magnetic hysteresis using Jiles Atherton model and carries out physical interpretation, and combines test actual measurement
Data are modified, and have solved the intensity of magnetization to the differential equation of rate of change of magnetic using Matlab software self-compiling program；
Step 5: magnetic flux-tensile force test: tensile sample is all made of the sample of Φ 12.5mm, is given using DC power supply
Magnet exciting coil is powered, and tension specimen length is 400mm, carries out Uniform Tension, rate of loading 3.5kN/s, laboratory Indoor Temperature
At 23 DEG C ± 5 DEG C, repetition test obtains magnetic flux-stress relation curve of tension sample for degree control；
Step 6: magnetic flux-pressure stress test: sample is all made of the sample of Φ 12.5mm, using DC power supply to excitation
Coil is powered, and compression specimen length is 200mm, carries out homogeneous compaction, rate of loading 2.5kN/s, laboratory room temperature control
For system at 23 DEG C ± 5 DEG C, repetition test obtains magnetic flux-stress relation curve of compression sample；
Step 7: pressure-stress relation test is carried out for different tube diameters, wall thickness.
Scheme further, takes manual progress to the cutting of finished product sample in the step 1, is caused with reducing hot melt
Material internal structure variation to magnetic influence, for the ease of carrying out magnetomechanics performance test.
Scheme further, selects 4 groups of samples in the step 1, every group of test sample is cut into 5 examinations using same root
Test sample, every group of test sample is that 5 root long degree are cut by 2500mm finished product is that 500mm is formed.
Further, microstructure observing process is successively to be polished by coarse plain emery wheel, fine grinding wheel to scheme in the step 2,
Polished roughness control is in Ra0.04 hereinafter, the erosion processing for finally carrying out sample is seen under the conditions of amplifying 200 times
It examines to obtain microstructure morphology's metallographic microscope.
Scheme further, separately designs different wall thickness same diameter sample, different-diameter same wall in the step 7
Thick sample carries out magnetic flux-pressure stress test, obtains magnetic flux-stress relation curve.
The invention has the advantages that the present invention establishes different technologies grade pipe line steel by theory analysis and experimental study
Magnetomechanics constitutive model establishes oil-gas pipeline tube wall stress-induction magnetic parametric analysis method of various factors coupling, has verified pipe
The increment changing rule of induced flux, different duct wall affecting laws, pipe diameter affecting laws under road different operating pressure
With temperature change affecting laws, the stress mornitoring utility model with highly linear is proposed.
Detailed description of the invention
Fig. 1 is the micro- metallographic of microstructure in step 2 of the present invention into figure；
Fig. 2 is excitation field intensity when being 1.2T, pipeline work pressure and induced flux relational graph；
Specific embodiment
Clear and complete description is done to the present invention with reference to the accompanying drawing, so that those skilled in the art is not needing to make
Under conditions of creative work, it can sufficiently implement the present invention.
A specific embodiment of the invention: a kind of pipe line steel magnetic force property detection method,
Step 1: design sample: the X80 pipe line steel pole sample of 4 groups of difference production batch is selected, every group is cut into five
Root is respectively used to microstructure electron-microscope scanning, B-H loop measurement, magnetizing parameters determination, magnetic flux-tensile force test, magnetic flux
Five kinds of operating condition of test such as amount-pressure stress test select pipe line steel pole sample verifying wall thickness, the pipe of different wall thickness, different-diameter
Influence of the diameter to the increment changing rule of induced flux under different operating pressure；
Step 2: microstructure observing: using coming card DMI3000M/DFC450 inverted metallurgic microscope, to test sample,
Under the conditions of amplifying 200 times, the micro- metallographic of microstructure has been carried out into map analysis, organization chart is as shown in Figure 1 from micro- metallographic microscope
In as can be seen that in the microstructure morphology of X80 pipeline steel curved beam, be mainly made of ferrite and pearlite, grain size
It is relatively uniform, meet the requirement of pipe line steel institutional framework.According to image analysis, pearlite 12.45%, ferrite is
87.55%, pearlite average diameter is about 64 μm, in addition, by the study found that the mechanical property of pipe line steel has with constituent content
Certain rule is presented in certain relationship in terms of microstructure, and content of pearlite in alloy is higher, and corresponding intensity and hardness are also got over
Height, but the magnetic conductivity of pipeline steel curved beam decreases；
Step 3: magnetization curve is drawn: at normal temperature, being loaded magnetic field with the rate of 100Oe/s, is obtained magnetic field strength and magnetic
The corresponding relationship of square, then inverse goes out B-H relation curve i.e. magnetization curve；
Step 4: parameter is returned to magnetic hysteresis using Jiles Atherton model and carries out physical interpretation, and combines test actual measurement
Data are modified, and have solved the intensity of magnetization to the differential equation of rate of change of magnetic using Matlab software self-compiling program；
Step 5: magnetic flux-tensile force test: tensile sample is all made of the sample of Φ 12.5mm, is given using DC power supply
Magnet exciting coil is powered, and tension specimen length is 400mm, carries out Uniform Tension, rate of loading 3.5kN/s, laboratory Indoor Temperature
At 23 DEG C ± 5 DEG C, repetition test obtains magnetic flux-stress relation curve of tension sample for degree control；
Step 6: magnetic flux-pressure stress test: sample is all made of the sample of Φ 12.5mm, using DC power supply to excitation
Coil is powered, and compression specimen length is 200mm, carries out homogeneous compaction, rate of loading 2.5kN/s, laboratory room temperature control
For system at 23 DEG C ± 5 DEG C, repetition test obtains magnetic flux-stress relation curve of compression sample；
Step 7: pressure-stress relation test is carried out for different tube diameters, wall thickness.
Further, manual progress is taken to the cutting of finished product sample in the step 1, heats caused material to reduce
Internal structure change is expected to magnetic influence, for the ease of carrying out magnetomechanics performance test.
Further, every group of test sample uses same root to be cut into 5 test samples, every group of test examination in the step 1
Sample is that 5 root long degree are cut by 2500mm finished product is that 500mm is formed.
Further, microstructure observing process is successively to be polished by coarse plain emery wheel, fine grinding wheel in the step 2, through throwing
The control of light roughness is in Ra0.04 hereinafter, the erosion processing for finally carrying out sample observe under the conditions of amplifying 200 times
To microstructure morphology's metallographic microscope.
Further, different wall thickness same diameter sample, the identical wall thickness examination of different-diameter are separately designed in the step 7
Sample carries out magnetic flux-pressure stress test, and when excitation field intensity is 1.2T, pipeline work pressure and inducting flux magnitude relation are such as
Shown in Fig. 2.
Presently preferred embodiments of the present invention is described above, it should be pointed out that the invention is not limited to above-mentioned
Particular implementation, devices and structures not described in detail herein should be understood as gives reality with the common mode in this field
It applies；Anyone skilled in the art, without departing from the scope of the technical proposal of the invention, technology according to the present invention
Essence any simple modifications, equivalents, and modifications made to the above embodiment still fall within technical solution of the present invention protection
In the range of.
Claims (5)
1. a kind of pipe line steel magnetic force property detection method, which is characterized in that
Step 1: design sample: selecting the pipe line steel pole sample of multiple groups difference production batch, and every group is cut into five, respectively
It is answered for microstructure electron-microscope scanning, B-H loop measurement, magnetizing parameters determination, magnetic flux-tensile force test, magnetic flux-pressure
Five kinds of operating condition of test such as power test select different wall thickness, the pipe line steel pole sample verifying wall thickness of different-diameter, caliber to difference
The influence of the increment changing rule of induced flux under operating pressure；
Step 2: it microstructure observing: using card DMI3000M/DFC450 inverted metallurgic microscope is come, to test sample, is putting
Under the conditions of big 200 times, the micro- metallographic of microstructure has been carried out into map analysis；
Step 3: magnetization curve is drawn: at normal temperature, being loaded magnetic field with the rate of 100Oe/s, is obtained magnetic field strength and magnetic moment
Corresponding relationship, then inverse goes out B-H relation curve i.e. magnetization curve；
Step 4: parameter is returned to magnetic hysteresis using Jiles Atherton model and carries out physical interpretation, and combines test measured data
It is modified, the intensity of magnetization has been solved to the differential equation of rate of change of magnetic using Matlab software self-compiling program；
Step 5: magnetic flux-tensile force test: tensile sample is all made of the sample of Φ 12.5mm, using DC power supply to excitation
Coil is powered, and tension specimen length is 400mm, carries out Uniform Tension, rate of loading 3.5kN/s, laboratory room temperature control
For system at 23 DEG C ± 5 DEG C, repetition test obtains magnetic flux-stress relation curve of tension sample；
Step 6: magnetic flux-pressure stress test: sample is all made of the sample of Φ 12.5mm, using DC power supply to magnet exciting coil
It is powered, compression specimen length is 200mm, carries out homogeneous compaction, rate of loading 2.5kN/s, and room temperature control in laboratory exists
23 DEG C ± 5 DEG C, repetition test obtains magnetic flux-stress relation curve of compression sample；
Step 7: pressure-stress relation test is carried out for different tube diameters, wall thickness.
2. a kind of pipe line steel magnetic force property detection method according to claim 1, which is characterized in that right in the step 1
Manual progress is taken in the cutting of finished product sample, to reduce the influence for heating caused material internal structure variation to magnetism, in order to
It is convenient for magnetomechanics performance test.
3. a kind of pipe line steel magnetic force property detection method according to claim 1, which is characterized in that selected in the step 1
With 4 groups of samples, every group of test sample is cut into 5 test samples using same root, and every group of test sample is cut by 2500mm finished product
Being cut into 5 root long degree is that 500mm is formed.
4. a kind of pipe line steel magnetic force property detection method according to claim 1, which is characterized in that micro- in the step 2
Seeing structure observation process is successively to be polished by coarse plain emery wheel, fine grinding wheel, and polished roughness control is in Ra0.04 hereinafter, most laggard
The erosion of row sample is handled, and under the conditions of amplifying 200 times, is observed to obtain microstructure morphology's metallographic microscope.
5. a kind of pipe line steel magnetic force property detection method according to claim 1, which is characterized in that divide in the step 7
Not She Ji different wall thickness same diameter sample, the identical wall thickness sample of different-diameter, carry out magnetic flux-pressure stress test, obtain magnetic
Flux-stress relation curve.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040265644A1 (en) * | 2003-06-30 | 2004-12-30 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| CN101963567A (en) * | 2010-09-21 | 2011-02-02 | 中国兵器工业第五二研究所 | Method and device for testing magnetic viscosity of magnetic liquid |
| CN103278558A (en) * | 2012-12-10 | 2013-09-04 | 重庆交通大学 | Anchoring system nondestructive test apparatus and method based on magnetic induced shrinkage or elongation |
| CN205404778U (en) * | 2016-03-07 | 2016-07-27 | 翁光远 | Steel stress detection device |
| CN106568538A (en) * | 2016-10-17 | 2017-04-19 | 翁光远 | Portable in-service steel bridge stress detector based on magnetic flux technology |
-
2019
- 2019-03-22 CN CN201910221870.4A patent/CN109883836B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040265644A1 (en) * | 2003-06-30 | 2004-12-30 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| CN101963567A (en) * | 2010-09-21 | 2011-02-02 | 中国兵器工业第五二研究所 | Method and device for testing magnetic viscosity of magnetic liquid |
| CN103278558A (en) * | 2012-12-10 | 2013-09-04 | 重庆交通大学 | Anchoring system nondestructive test apparatus and method based on magnetic induced shrinkage or elongation |
| CN205404778U (en) * | 2016-03-07 | 2016-07-27 | 翁光远 | Steel stress detection device |
| CN106568538A (en) * | 2016-10-17 | 2017-04-19 | 翁光远 | Portable in-service steel bridge stress detector based on magnetic flux technology |
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