CN105181427B - The detection method and characterizing method of the micropore shape defect of solid drawn tube - Google Patents
The detection method and characterizing method of the micropore shape defect of solid drawn tube Download PDFInfo
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- CN105181427B CN105181427B CN201510487607.1A CN201510487607A CN105181427B CN 105181427 B CN105181427 B CN 105181427B CN 201510487607 A CN201510487607 A CN 201510487607A CN 105181427 B CN105181427 B CN 105181427B
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Abstract
The present invention relates to a kind of detection method and ranking method of solid drawn tube defect, belongs to the metal material field that metallurgical industry produces.The present invention provides a kind of detection method of solid drawn tube micropore shape defect, comprises the following steps：1) one section of horizontal pipeline section is cut on solid drawn tube, its longitudinal length is not less than 40 millimeters, takes the metallographic specimen of 4~8 reservation inner and outer surfaces every 45 °~90 ° in the pipeline section transverse direction, and its longitudinal length is not less than 30 millimeters；A sample cut from the most thin region of solid drawn tube wall thickness is comprised at least in metallographic specimen；2) ground, polished using the longitudinal check face of metallographic specimen as inspection face and to it；3) the inspection face of micro- Microscopic observation metallographic specimen, the hole being distributed on inspection face is micropore shape defect.The inventive method can rapidly and accurately detect the distribution situation of solid drawn tube center portion micropore shape defect, and its quality condition is assessed.
Description
Technical field
The present invention relates to a kind of detection method and ranking method of solid drawn tube defect, belongs to metallurgical industry production
Metal material field.
Background technology
In the production process of solid drawn tube, if pipe is annealed without annealing or tempering heat treatment and pipe
Or the ineffective of tempering heat treatment, pickling, phosphatization, saponification is ineffective, cold-drawing technology parameter is improper, thickness of steel pipe is uneven,
Micropore shape defect may be formed in the center portion between solid drawn tube inside and outside wall.
The center portion of solid drawn tube not only causes the fault location stress concentration high, easy shape there is micropore shape defect
Into tired source or formation of crack, and the extension of micropore shape fault location can also reduce with mechanical properties such as impact flexibility, and serious is micro-
Poroid defect will also cause cold-drawn product premature failure.Thus the micropore shape defect of solid drawn tube center portion detect non-
It is often necessary.
At present, the detection method and judgment criteria of such solid drawn tube center portion micropore shape defect be there is no.
The content of the invention
The purpose of the present invention is aiming at deficiency of the prior art, there is provided a kind of solid drawn tube center portion micropore shape lacks
Sunken inspection and ranking method, it can rapidly and accurately detect the distribution situation of solid drawn tube center portion micropore shape defect,
And its quality condition is assessed.
Technical scheme：
The present invention provides a kind of detection method of solid drawn tube micropore shape defect, and the detection method includes following step
Suddenly：
1) one section of horizontal pipeline section is cut on solid drawn tube, its longitudinal length is not less than 40 millimeters, horizontal in the pipeline section
The metallographic specimen of 4~8 reservation inner and outer surfaces is taken every 45 °~90 ° upwards, and its longitudinal length is not less than 30 millimeters；Metallographic
A sample cut from the most thin region of solid drawn tube wall thickness is comprised at least in sample；
2) using the longitudinal check face of metallographic specimen as inspection face, the inspection face of each sample is by corase grind, washing and thin
Mill, the good metallographic specimen of fine grinding examine face to clean and carry out first time polishing using polishing agent on polishing machine, are polished to its table
Face light is seamless；Second is carried out after examining face clean polished metallographic specimen again on polishing machine to polish, second of throwing
Light is using silk as polishing fabric, clear water is used as polishing agent；Last metallographic specimen examines face to be cleaned successively with alcohol, hot water, blows
After dry；
3) the inspection face of micro- Microscopic observation metallographic specimen, the hole being distributed on inspection face is micropore shape defect.
Preferably, in step 1, the metallographic specimen of 4 reservation inner and outer surfaces is taken every 90 ° in the pipeline section transverse direction.
Further, step 2 is：By metallographic specimen inspection face polished on grinding machine, the sample polished after clear water rinses, then
Flour milling is successively placed on 280#-600#--800#--1000# each abrasive paper for metallograph and carries out fine grinding；During fine grinding, adjusting every time
When changing the thinner sand paper of No.1, sample should be rotated by 90 ° and be ground；Ground sample is eluted with water again, thrown
It is polished on ray machine using diamond polishing agent, it is seamless to its surface-brightening；Polished sample is eluted with water again, selected
Clean silk is polished, to remove the throwing adhered on sample as polishing fabric, clear water as polishing agent on polishing machine
The foreign matters such as photo etching, polishing fabric, the grains of sand；It is by test check ground drying with blowing with after alcohol, hot water washed samples successively again
Can.
Preferably, polishing agent described in step 2 is diamond dust.
Further, in step 3, microscopical multiplication factor is 12.5~100 times.
The characterizing method of the solid drawn tube micropore shape defect order of severity, comprises the following steps：
1) any one of the claims 1 to 3 detection method is used in a metallographic specimen of surveyed solid drawn tube
Inspection face on find two micropore shape defects closest to the metallographic specimen inner and outer surfaces respectively；By described two micro-
Poroid defect does two parallel lines parallel to sample outer surface respectively, using the distance between described two parallel lines as the examination
The maximum spacing of micropore shape defect area, is denoted as A on sample；The micropore shape that the solid drawn tube is characterized with L=A/B ratio lacks
The wall thickness of the sunken order of severity, wherein B=solid drawn tubes,
2) at least four metallographic specimen repeat steps 1 surveyed on solid drawn tube obtain corresponding L values, metallographic specimen
Middle maximum L values characterize the order of severity for the micropore shape defect for surveying solid drawn tube, and the L values are bigger, then surveyed cold-drawn without
The micropore shape defect for stitching steel pipe is more serious.
Further, used for ordinary construction, trandfer fluid solid drawn tube, if L >=3/4, survey seamless steel pipe
Micropore shape defect it is very serious, surveying seamless steel pipe can not use；For the cold-drawn applied under high temperature, high pressure or particular surroundings
Seamless steel pipe, if L >=1/2, survey that the micropore shape defect of seamless steel pipe is very serious, and surveying seamless steel pipe can not use.
Beneficial effects of the present invention：
The present invention can rapidly and accurately determine solid drawn tube center portion micropore shape defect and its order of severity is carried out
Characterize, the desired value of its order of severity and its mechanical property exist it is certain associate, therefore by detecting micropore shape defect and right
Its order of severity is characterized the On Quality Examining Problems that just can efficiently solve solid drawn tube, is met the needs of production.
Brief description of the drawings
Fig. 1 is to cut one section of horizontal pipeline section 2 on solid drawn tube；L1≥40mm.
Fig. 2 by position view of the interception metallographic specimen on horizontal pipeline section, L2 >=30mm.
Fig. 3 is the location map that metallographic specimen is intercepted on horizontal pipeline section section；L3 is taken transverse length, and α is 45 ° and arrived
90°。
Fig. 4 is the structural representation of metallographic specimen.
Fig. 5 is the location map for intercepting metallographic specimen on horizontal pipeline section every 90 °.
Indicated in figure：1- solid drawn tubes, 2- transverse direction pipeline sections, 3- metallographic specimens, 4- horizontal checks face, 5- longitudinal checks
Face.
Embodiment
The present invention provides a kind of detection method of solid drawn tube micropore shape defect, and the detection method includes following step
Suddenly：
1) one section of horizontal pipeline section 2 is cut on solid drawn tube 1, its longitudinal length L1 is not less than 40 millimeters, in the pipe
The metallographic specimens 3 of 4~8 reservation inner and outer surfaces are taken on section is horizontal every 45 °~90 °, and its longitudinal length L2 is not less than 30 millis
Rice；A sample cut from the most thin region of solid drawn tube wall thickness is comprised at least in metallographic specimen；
2) using the longitudinal check face of metallographic specimen as inspection face, the inspection face of each sample is by corase grind, washing and thin
Mill, the good metallographic specimen of fine grinding examine face to clean and carry out first time polishing using polishing agent on polishing machine, are polished to its table
Face light is seamless；Second is carried out after examining face clean polished metallographic specimen again on polishing machine to polish, second of throwing
Light is using silk as polishing fabric, clear water is used as polishing agent；Last metallographic specimen examines face to be cleaned successively with alcohol, hot water, blows
After dry；
3) the inspection face of micro- Microscopic observation metallographic specimen, microscopical multiplication factor is 12.5~100 times, on inspection face
The hole of distribution is micropore shape defect.
Preferably, in step 1, the metallographic specimen of 4 reservation inner and outer surfaces is taken every 90 ° in the pipeline section transverse direction.
In step 1, the longitudinal length for all metallographic specimens being finally process all should be not less than 30 millimeters, and it is longitudinally long
Spend it is small be possible to missing inspection, its longitudinal length is long to be ground, polishes inconvenience.
Further, step 2 is：By metallographic specimen inspection face polished on grinding machine, the sample polished after clear water rinses, then
Flour milling is successively placed on 280#-600#--800#--1000# each abrasive paper for metallograph and carries out fine grinding；During fine grinding, adjusting every time
When changing the thinner sand paper of No.1, sample should be rotated by 90 ° and be ground；Ground sample is eluted with water again, polished
It is polished on machine using diamond polishing agent, it is seamless to its surface-brightening；Polished sample is eluted with water again, from dry
Net silk is polished, to remove the polishing adhered on sample as polishing fabric, clear water as polishing agent on polishing machine
The foreign matters such as agent, polishing fabric, the grains of sand；It is by test check ground drying with blowing with after alcohol, hot water washed samples successively again
Can.
The model of abrasive paper for metallograph is more big thinner, and 280# (i.e. No. 280) is generally referred to as 280 mesh, and number (or a mesh) refers to abrasive material
Thickness and abrasive material quantity per square inch, number higher, abrasive material is thinner.Mesh is defined as：There are 256 on area per square inch
Eye, each eye is a mesh.
The characterizing method of the solid drawn tube micropore shape defect order of severity, comprises the following steps：
1) any one of the claims 1 to 3 detection method is used in a metallographic specimen of surveyed solid drawn tube
Inspection face on find two micropore shape defects closest to the metallographic specimen inner and outer surfaces respectively；By described two micro-
Poroid defect does two parallel lines parallel to sample outer surface respectively, using the distance between described two parallel lines as the examination
The maximum spacing of micropore shape defect area, is denoted as A on sample；The micropore shape that the solid drawn tube is characterized with L=A/B ratio lacks
The wall thickness of the sunken order of severity, wherein B=solid drawn tubes,
2) at least four metallographic specimen repeat steps 1 surveyed on solid drawn tube obtain corresponding L values, metallographic specimen
Middle maximum L values characterize the order of severity for the micropore shape defect for surveying solid drawn tube, and the L values are bigger, then surveyed cold-drawn without
The micropore shape defect for stitching steel pipe is more serious.
Micropore shape defect, which has following both sides on solid drawn tube, to be influenceed：
1) to the influence of mechanical properties of pipe, micropore shape defect is by the impact flexibility for causing steel pipe, elongation after fracture and breaks
Face shrinkage factor is remarkably decreased, and micropore shape defect is more serious, and the fall of impact flexibility, elongation after fracture and the contraction percentage of area is just
It is bigger；
2) influence of steel pipe Long-Term Properties, the center portion of solid drawn tube can be caused there is micropore shape defect
The fault location stress concentration is high, forms tired source or formation of crack, after long-term use of, fatigue fracture easily occurs；
In actual production, mainly judge whether solid drawn tube is qualified by mechanics properties testing at present, but steel pipe
The conventional mechanical property such as detection such as impact flexibility, elongation after fracture it is cumbersome, the detection cycles of Long-Term Properties is again very long,
In consideration of it, the present invention proposes a kind of characterizing method of the efficiently solid drawn tube micropore shape defect order of severity, by cold-drawn without
The order of severity for stitching the micropore shape defect of steel pipe to reflect indirectly the mechanical property and performance of steel pipe, so as to seamless cold
Whether steel pipe meets that requirement provides a kind of quite easily detection method；As the L of solid drawn tube》When 3/4, then directly
Connect and be considered as defective work, without detecting its mechanical property etc. again；As 1/4≤L ＜ 3/4, the survey of mechanical property can be aided with again
Test result determines whether gained solid drawn tube is qualified.
Those skilled in the art can also use the characterizing method of the micropore shape defect order of severity proposed by the present invention, with reference to
The mechanical property of some steel grade steel pipes and the experimental result of performance, sum up certain specific steel grade seamless steel pipe L values with
Whether the direct corresponding relation between qualified (national standard that mechanical property meets the steel grade steel pipe is i.e. qualified), as the present invention carries
Go out：Used for ordinary construction, trandfer fluid solid drawn tube, characterize the L values of the seamless steel pipe pore defect order of severity
It must is fulfilled for L ＜ 3/4；For the solid drawn tube applied under high temperature, high pressure or particular surroundings, characterize seamless steel pipe micropore and lack
The L values for falling into the order of severity must are fulfilled for L ＜ 1/2.Once obtain L values in specific steel grade and it is whether qualified between corresponding relation,
, only need to be first using the detection side of micropore shape defect of the invention so when producing the seamless steel pipe of the specific steel grade of new lot
Method and characterizing method obtain corresponding L values, you can judge whether the batch steel grade is qualified, without detecting its mechanical property etc. again
Index.
The regularity of distribution of the present invention applicant according to micropore shape defect and the influence degree to cold drawing steel tube service life and
Above-mentioned detection method and characterizing method have been formulated, can be quickly accurate using the detection method and characterizing method those skilled in the art
Really determine the micropore shape defect of solid drawn tube center portion and its order of severity is characterized, cold-drawn can be efficiently solved
The On Quality Examining Problems of seamless steel pipe, meet the needs of production.
The detection of solid drawn tube micropore shape defect has four key points：
(1) selection of sampling point, because in Cold Drawing Process, the most thin region of pipe wall thickness will be by other regions
Additional tension, therefore, micropore shape defect most easily appears in the most thin region of solid drawn tube wall thickness；To ensure to sample
Position is representative, the middle sample that must include the most thin region of wall thickness of materialsing；
(2) examine face selection, due to micropore shape defect on solid drawn tube along steel pipe Longitudinal extending, so, with
The horizontal face of selection sample is compared, and is selected the longitudinal surface of sample and can be played increase test samples quantity as inspection face, improve inspection
Test the effect of precision；
(3) preparation of sample, typically after polishing, polishing, certain amount is inevitably dispersed with sample flour milling
Pockmark, and the foreign matters such as polishing agent, polishing fabric, the grains of sand are often dispersed with pockmark, these foreign matters are stronger with basal body binding force, adopt
It is not easy to clean up with conventional method, when so being observed under the microscope, above-mentioned pockmark is easily obscured with micropore shape defect,
So as to influence checkability and quality；To solve the above problems, applicant of the present invention is knitted from clean silk as polishing
Thing, as polishing agent, the sample after first preceding step is polished is polished clear water on polishing machine, is removed on sample and in pockmark
Polishing agent, polishing fabric, the foreign matter such as the grains of sand of portion's attachment, then wash with alcohol, hot water the grease on sample and inside pockmark
Afterwards, pockmark has just obtained more thoroughly cleaning, and its bottom is shinny when being observed under the microscope, and micropore shape defect is aobvious
Bottom blacks when being observed under micro mirror, thus easily differentiates between pockmark and micropore shape defect, so as to improve detection effect
Rate, it ensure that detection quality.
The characterizing method of the micropore shape defect order of severity, according to research of the applicant of the present invention to micropore shape defect, hair
Micropore shape defect on existing solid drawn tube has following characteristics：1) regional area of the defect on solid drawn tube is in
Longitudinally oriented strip zonal distribution, the region are mostly the most thin region of solid drawn tube wall thickness；2) longitudinal direction of micropore shape defect and horizontal stroke
It is irregular hole to form, the size of single micropore is typically between 5um and 30um；3) micropore shape defect is formed at cold
Pull out in the middle part of the wall thickness of seamless steel pipe, with the increase of additional tension, the quantity increase of micropore shape defect, its distributed areas also to
Inner and outer surfaces are spread around；Therefore, the solid drawn tube micropore shape defect can be weighed with the size of micropore shape defect area
The order of severity.
According to the formation mechenism of micropore shape defect, distribution characteristics and its shadow to solid drawn tube product performance
Ring, the present invention is serious as micropore shape defect is characterized with the ratio of whole wall thickness width using the maximum spacing of micropore shape defect area
The foundation of degree, and find the characterization value L and its mechanical property of the part solid drawn tube product micropore shape defect order of severity
It is whether qualified certain association to be present.
The embodiment of the present invention is further described with reference to embodiment, therefore not limited the present invention
System is among described scope of embodiments.
The specification of embodiment 1 is25Mn ordinary constructions with the detection of solid drawn tube micropore shape defect and its
The grading of micropore shape defect
Comprise the following steps that：
A, one section of horizontal pipeline section is cut on solid drawn tube, its longitudinal length is not less than 40 millimeters, horizontal in the pipeline section
The metallographic specimen of a reservation inner and outer surfaces is taken every 90 degree upwards, takes 4 samples altogether, its longitudinal length is not less than 30 millimeters,
Sample includes the sample cut from the most thin region of solid drawn tube wall thickness；
B, the longitudinal surface of sample is used as inspection face；
C, sample is tentatively polished on grinding machine, the sample polished is successively placed on 280#- after clear water rinses, then flour milling
Fine grinding is carried out on 600#--800#--1000# each abrasive paper for metallograph；Every time under exchange during the thinner sand paper of No.1, Ying Jiang
Sample, which is rotated by 90 °, to be ground；Ground sample is eluted with water again, carried out on polishing machine using diamond polishing agent
Polishing, it is seamless to its surface-brightening；Polished sample is eluted with water again, from clean silk as polishing fabric, clearly
Water is polished, to remove the foreign matters such as the polishing agent adhered on sample, polishing fabric, the grains of sand as polishing agent on polishing machine；
Sample is dried up with blowing with after alcohol, hot water washed samples successively again；
D, with the inspection face of metallography microscope sem observation aforementioned four sample, find on each test check face and most connect respectively
The micropore shape defect of nearly inner and outer surfaces, two are done respectively parallel to the flat of sample outer surface by above-mentioned two micropore shape defect
Line, the maximum spacing using the distance between above-mentioned two parallel lines as micropore shape defect area on the sample；
Found after observation, the maximum spacing of four sample micropore shape defect areas is respectively 0,0,0,4.2 millimeter, L difference
For 0,0,0,0.525, i.e. L=0.525 in the steel pipe.
Corresponding Mechanics Performance Testing is carried out to the steel pipe again, found for ordinary construction solid drawn tube (at least
Carry out the matching test between three groups of L values and mechanical property), its mechanical property of L ＜ 3/4 product is qualified.Consequently found that profit
It can directly verify whether the mechanical property of produced steel pipe is up to standard with the method for the present invention.For ordinary construction steel pipe,
As long as L ＜ 3/4 show that its is qualified.
The specification of embodiment 2 is30CrMo gas cylinder seamless steel pipe micropore shape defects detection and its micropore shape
The grading of defect
Comprise the following steps that：
A, one section of horizontal pipeline section is cut on cold drawing steel tube, its longitudinal length is not less than 40 millimeters, in the pipeline section transverse direction
The metallographic specimen of a reservation inner and outer surfaces is taken every 90 degree, takes 4 samples altogether, its longitudinal length is not less than 30 millimeters, sample
Include the sample cut from the most thin region of solid drawn tube wall thickness；
B, the longitudinal check face that face is sample is examined；
C, sample is tentatively polished on grinding machine, the sample polished is successively placed on 280#- after clear water rinses, then flour milling
Fine grinding is carried out on 600#--800#--1000# each abrasive paper for metallograph；It will should be tried during the thinner sand paper of No.1 under exchange every time
Sample, which is rotated by 90 °, to be ground；Ground sample is eluted with water again, thrown on polishing machine using diamond polishing agent
Light, it is seamless to its surface-brightening；Polished sample is eluted with water again, from clean silk as polishing fabric, clear water
As polishing agent, it is polished on polishing machine, to remove the foreign matters such as the polishing agent adhered on sample, polishing fabric, the grains of sand；Again
Successively with after alcohol, hot water washed samples, sample is dried up with blowing.
D, with the inspection face of metallography microscope sem observation aforementioned four sample, found respectively on test check face closest
The micropore shape defect of inner and outer surfaces, two parallel lines parallel to sample outer surface are done by above-mentioned micropore shape defect respectively, will
Maximum spacing of the distance between above-mentioned two parallel lines as micropore shape defect area on the sample.
Found after observation, the maximum spacing of four sample micropore shape defect areas is respectively 0,0,0,8.2 millimeter, L difference
For 0,0,0,0.456, i.e. L=0.456 in the steel pipe.
Corresponding Mechanics Performance Testing is carried out to the steel pipe again, finds (at least to have carried out three groups of L for gas cylinder seamless steel pipe
Matching test between value and mechanical property), its mechanical property of L ＜ 1/2 product is qualified.Consequently found that utilize the present invention's
Method can directly verify whether the mechanical property of produced steel pipe is up to standard.For gas cylinder seamless steel pipe, as long as the tables of L ＜ 1/2
It is bright that its is qualified.
Embodiment 3, specification are30CrMo gas cylinder seamless steel pipe micropore shape defects detection and its micropore shape
The grading of defect
Comprise the following steps that：
A, one section of horizontal pipeline section is cut on cold drawing steel tube, its longitudinal length is not less than 40 millimeters, in the pipeline section transverse direction
The metallographic specimen of a reservation inner and outer surfaces is taken every 90 degree, takes 4 samples altogether, its longitudinal length is not less than 30 millimeters, sample
Include the sample cut from the most thin region of cold drawing steel tube wall thickness；
B, the longitudinal check face that face is sample is examined；
C, sample is tentatively polished on grinding machine, the sample polished is successively placed on 280#- after clear water rinses, then flour milling
Fine grinding is carried out on 600#--800#--1000# each abrasive paper for metallograph；It will should be tried during the thinner sand paper of No.1 under exchange every time
Sample, which is rotated by 90 °, to be ground；Ground sample is eluted with water again, thrown on polishing machine using diamond polishing agent
Light, it is seamless to its surface-brightening；Polished sample is eluted with water again, from clean silk as polishing fabric, clear water
As polishing agent, it is polished on polishing machine, to remove the foreign matters such as the polishing agent adhered on sample, polishing fabric, the grains of sand；Again
Successively with after alcohol, hot water washed samples, sample is dried up with blowing.
D, with the inspection face of metallography microscope sem observation aforementioned four sample, found respectively on test check face closest
The micropore shape defect of inner and outer surfaces, two parallel lines parallel to sample outer surface are done by above-mentioned micropore shape defect respectively, will
Maximum spacing of the distance between above-mentioned two parallel lines as micropore shape defect area on the sample.
Found after observation, the maximum spacing of four sample micropore shape defect areas is 0,0,2.5,3.6 millimeter, and L is respectively
0th, 0,0.417,0.6, i.e. L=0.6 in the steel pipe.
Corresponding Mechanics Performance Testing is carried out to the steel pipe again, finds (at least to have carried out three groups of L for gas cylinder seamless steel pipe
Matching test between value and mechanical property), its mechanical property of L ＜ 1/2 product is qualified, and its L value is 0.6 in the present invention,
Therefore this batch of steel pipe is unqualified.
As can be seen here, the present invention can rapidly and accurately determine solid drawn tube center portion micropore shape defect and serious to its
Degree is characterized, the desired value of its order of severity and its mechanical property exist it is certain associate, therefore by detecting micropore shape
Defect is simultaneously characterized the On Quality Examining Problems that just can efficiently solve solid drawn tube to its order of severity, meets production
Needs.
Claims (9)
1. the characterizing method of the solid drawn tube micropore shape defect order of severity, it is characterised in that comprise the following steps：
1) using solid drawn tube micropore shape defect detection method surveyed solid drawn tube a metallographic specimen
Two micropore shape defects closest to the metallographic specimen inner and outer surfaces are found on inspection face respectively；Pass through described two micropores
Shape defect does two parallel lines parallel to sample outer surface respectively, using the distance between described two parallel lines as the sample
The maximum spacing of upper micropore shape defect area, is denoted as A；The micropore shape defect of the solid drawn tube is characterized with L=A/B ratio
The order of severity, wherein B=solid drawn tubes wall thickness；
2) at least four metallographic specimen repeat steps 1 surveyed on solid drawn tube obtain corresponding L values, in metallographic specimen most
Big L values characterize the order of severity for the micropore shape defect for surveying solid drawn tube, and the L values are bigger, then surveyed seamless cold steel
The micropore shape defect of pipe is more serious；
Wherein, the detection method of the solid drawn tube micropore shape defect comprises the following steps：
(1) one section of horizontal pipeline section is cut on surveyed solid drawn tube, its longitudinal length is not less than 40 millimeters, horizontal in the pipeline section
The metallographic specimen of 4~8 reservation inner and outer surfaces is taken every 45 °~90 ° upwards, and its longitudinal length is not less than 30 millimeters；Metallographic
A sample cut from the most thin region of solid drawn tube wall thickness is comprised at least in sample；
(2) corase grind, washing and fine grinding are passed through using the longitudinal check face of metallographic specimen as inspection face, the inspection face of each sample,
The good metallographic specimen of fine grinding examines face to clean and carries out first time polishing using polishing agent on polishing machine, is polished to its surface light
It is bright seamless；Examine face to carry out second on polishing machine after cleaning polished metallographic specimen again to polish, second of polishing with
Silk is as polishing fabric, clear water as polishing agent；Last metallographic specimen examines face to be cleaned successively with alcohol, hot water, after drying
；
(3) the inspection face of micro- Microscopic observation metallographic specimen, the hole being distributed on inspection face is micropore shape defect.
2. the characterizing method of the solid drawn tube micropore shape defect order of severity according to claim 1, it is characterised in that
In the step of detection method (1), the metallographic specimen of 4 reservation inner and outer surfaces is taken every 90 ° in the pipeline section transverse direction.
3. the characterizing method of the solid drawn tube micropore shape defect order of severity according to claim 1 or 2, its feature exist
(2) are in, the detection method the step of：Metallographic specimen inspection face is polished on grinding machine, the sample polished rinses through clear water
Afterwards, then flour milling is successively placed on 280#~600#~800#~1000# each abrasive paper for metallograph and carries out fine grinding；During fine grinding, often
During the thinner sand paper of the secondary No.1 under exchange, sample should be rotated by 90 ° and be ground；Ground sample is eluted with water again,
It is polished on polishing machine using polishing agent, it is seamless to its surface-brightening；Polished sample is eluted with water again, from dry
Net silk is polished, then cleaned successively with alcohol, hot water as polishing fabric, clear water as polishing agent on polishing machine
After sample, with blowing by test check ground drying.
4. the characterizing method of the solid drawn tube micropore shape defect order of severity according to claim 1 or 2, its feature exist
Polishing agent is diamond dust described in (2) in, the detection method the step of.
5. the characterizing method of the solid drawn tube micropore shape defect order of severity according to claim 3, it is characterised in that
Polishing agent described in the step of detection method (2) is diamond dust.
6. the characterizing method of the solid drawn tube micropore shape defect order of severity according to claim 1,2 or 5 any one,
Characterized in that, in the step of detection method (3), microscopical multiplication factor is 12.5~100 times.
7. the characterizing method of the solid drawn tube micropore shape defect order of severity according to claim 3, it is characterised in that
In the step of detection method (3), microscopical multiplication factor is 12.5~100 times.
8. the characterizing method of the solid drawn tube micropore shape defect order of severity according to claim 4, it is characterised in that
In the step of detection method (3), microscopical multiplication factor is 12.5~100 times.
9. the characterizing method of the solid drawn tube micropore shape defect order of severity according to claim 1, it is characterised in that
Used for ordinary construction, trandfer fluid solid drawn tube, if L >=3/4, survey the micropore shape defect of seamless steel pipe very
Seriously, surveying seamless steel pipe can not use；For the solid drawn tube applied under high temperature, high pressure or particular surroundings, if L >=1/
2, then the micropore shape defect of surveyed seamless steel pipe is very serious, and surveying seamless steel pipe can not use.
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| CN109580683B (en) * | 2018-11-23 | 2021-03-02 | 广东工业大学 | Manufacturing method of glass fiber reinforced PTFE plate half-hole section |
| CN111006949B (en) * | 2019-12-12 | 2020-11-17 | 河海大学 | Defect quantitative characterization and bursting strength prediction method for defect geomembrane |
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