CN105181427A - Detection method and characterization method of microporous defects of cold-drawn seamless steel pipe - Google Patents
Detection method and characterization method of microporous defects of cold-drawn seamless steel pipe Download PDFInfo
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Abstract
The present invention relates to a detection method and a rating method of microporous defects of a cold-drawn seamless steel pipe, and belongs to the field of metal materials in metallurgical industry production. The present invention provides a detection method of microporous defects of cold-drawn seamless steel pipe. The method comprises the steps of: 1) cutting a transverse section with longitudinal length of not less than 40 mm from the cold-drawn seamless pipe, taking 4-8 metallographic samples, with reserved internal and external surfaces and longitudinal length of not less than 30 mm, every 45-90 DEG on the pipe section, wherein the metallurgical samples contain at least one cut from the thinnest area on the cold-drawn seamless steel pipe wall; 2) using a longitudinal test surface of the metallographic test sample surface as the test surface, grinding and polishing; 3) observing the test surface of the metallographic test sample under microscope, wherein the holes on the test surface are microporous defects. The method of the present invention can quickly and accurately detect the distribution of microporous defects in the core of the cold-drawn seamless pipe, and assess its quality status.
Description
Technical field
The present invention relates to a kind of detection method and ranking method of solid drawn tube defect, belong to the metal material field that metallurgical industry is produced.
Background technology
In the production run of solid drawn tube, if pipe without annealing or tempering heat treatment and pipe annealing or tempering heat treatment poor effect, pickling, phosphatization, saponification poor effect, cold-drawing technology parameter is improper, thickness of steel pipe is uneven, just may heart portion formation micropore shape defect between solid drawn tube inside and outside wall.
The heart portion of solid drawn tube also exists micropore shape defect, not only cause this fault location stress concentration high, the tired source of easy formation or formation of crack, and the mechanical property such as the extension of micropore shape fault location and impact flexibility also can reduce, and serious micropore shape defect also will cause cold-drawn product premature failure.Thus detect very necessary to the micropore shape defect in solid drawn tube heart portion.
At present, there is no detection method and the judgment criteria of such solid drawn tube heart portion micropore shape defect.
Summary of the invention
Object of the present invention is exactly for deficiency of the prior art, inspection and the ranking method of a kind of solid drawn tube heart portion micropore shape defect are provided, it can detect the distribution situation of solid drawn tube heart portion micropore shape defect rapidly and accurately, and assesses its quality condition.
Technical scheme of the present invention:
The invention provides a kind of detection method of solid drawn tube micropore shape defect, described detection method comprises the following steps:
1) on solid drawn tube, cut one section of horizontal pipeline section, its longitudinal length is not less than 40 millimeters, transversely get every 45 ° ~ 90 ° the metallographic specimen that 4 ~ 8 retain inside and outside surface, and its longitudinal length is not less than 30 millimeters at this pipeline section; A sample cut from the thinnest region of solid drawn tube wall thickness is at least comprised in metallographic specimen;
2) using the longitudinal check face of metallographic specimen as inspection face, the inspection face of each sample is through corase grind, washing and fine grinding, the metallographic specimen inspection face that fine grinding is good is cleaned and on buffing machine, uses brilliant polish to carry out first time polishing, is polished to its surface-brightening seamless; On buffing machine, carry out second time polishing after being cleaned in polished metallographic specimen inspection face again, for the second time polishing using silk as polishing fabric, clear water is as brilliant polish; Last metallographic specimen inspection face is cleaned, after drying up with alcohol, hot water successively;
3) the inspection face of basis of microscopic observation metallographic specimen, the hole that inspection face distributes is micropore shape defect.
Preferably, in step 1, transversely get every 90 ° the metallographic specimen that 4 retain inside and outside surface at this pipeline section.
Further, step 2 is: check face to polish on grinding machine metallographic specimen, and the sample polished after clear water rinses, then each abrasive paper for metallograph flour milling being successively placed on 280#-600#--800#--1000# carries out fine grinding; During fine grinding, at every turn when the sand paper that exchange next number is thinner, sample 90-degree rotation should be ground; Again ground sample is washed, buffing machine uses diamond polishing agent carry out polishing, seamless to its surface-brightening; Washed by polished sample, select clean silk as polishing fabric, clear water, as brilliant polish, buffing machine carries out polishing, to remove the foreign matter such as brilliant polish, polishing fabric, the grains of sand that sample adheres to; After using alcohol, hot water washed samples more successively, with blowing by test check ground drying.
Preferably, brilliant polish described in step 2 is emery.
Further, in step 3, microscopical enlargement factor is 12.5 ~ 100 times.
The characterizing method of the solid drawn tube micropore shape defect order of severity, comprises the steps:
1) adopt detection method described in any one of claims 1 to 3 on the inspection face of a metallographic specimen of surveyed solid drawn tube, find two micropore shape defects closest to the inside and outside surface of described metallographic specimen respectively; Do by described two micropore shape defects the parallel lines that two are parallel to sample outside surface respectively, using the maximum spacing of the distance between described two parallel lines as micropore shape defect area on this sample, be denoted as A; The order of severity of the micropore shape defect of this solid drawn tube is characterized, the wherein wall thickness of B=solid drawn tube with the ratio of L=A/B,
2) at least four metallographic specimens surveyed on solid drawn tube repeat steps 1 and obtain corresponding L value, L value maximum in metallographic specimen characterize survey the order of severity of the micropore shape defect of solid drawn tube, this L value is larger, then the micropore shape defect of surveyed solid drawn tube is more serious.
Further, for ordinary construction, conveying fluid solid drawn tube, if L >=3/4, then the micropore shape defect of surveyed weldless steel tube is very seriously, survey weldless steel tube and 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 weldless steel tube is very serious, survey weldless steel tube and can not use.
Beneficial effect of the present invention:
The present invention can measure solid drawn tube heart portion micropore shape defect rapidly and accurately and characterize its order of severity, certain associating is there is in the desired value of its order of severity with its mechanical property, therefore by detecting micropore shape defect and its order of severity being characterized to the On Quality Examining Problems that just effectively can solve solid drawn tube, meet the needs of production.
Accompanying drawing explanation
Fig. 1 solid drawn tube cuts one section of horizontal pipeline section 2; L1 >=40mm.
Fig. 2 by the position view of intercepting metallographic specimen on horizontal pipeline section, L2 >=30mm.
Fig. 3 is the location map horizontal pipeline section cross section intercepting metallographic specimen; L3 is taken transverse length, and α is 45 ° to 90 °.
Fig. 4 is the structural representation of metallographic specimen.
Fig. 5 is the location map horizontal pipeline section intercepting metallographic specimen every 90 °.
Indicate in figure: 1-solid drawn tube, the horizontal pipeline section of 2-, 3-metallographic specimen, 4-horizontal check face, 5-longitudinal check face.
Embodiment
The invention provides a kind of detection method of solid drawn tube micropore shape defect, described detection method comprises the following steps:
1) on solid drawn tube 1, cut one section of horizontal pipeline section 2, its longitudinal length L1 is not less than 40 millimeters, transversely get every 45 ° ~ 90 ° the metallographic specimen 3 that 4 ~ 8 retain inside and outside surface, and its longitudinal length L2 is not less than 30 millimeters at this pipeline section; A sample cut from the thinnest region of solid drawn tube wall thickness is at least comprised in metallographic specimen;
2) using the longitudinal check face of metallographic specimen as inspection face, the inspection face of each sample is through corase grind, washing and fine grinding, the metallographic specimen inspection face that fine grinding is good is cleaned and on buffing machine, uses brilliant polish to carry out first time polishing, is polished to its surface-brightening seamless; On buffing machine, carry out second time polishing after being cleaned in polished metallographic specimen inspection face again, for the second time polishing using silk as polishing fabric, clear water is as brilliant polish; Last metallographic specimen inspection face is cleaned, after drying up with alcohol, hot water successively;
3) the inspection face of basis of microscopic observation metallographic specimen, microscopical enlargement factor is 12.5 ~ 100 times, and the hole that inspection face distributes is micropore shape defect.
Preferably, in step 1, transversely get every 90 ° the metallographic specimen that 4 retain inside and outside surface at this pipeline section.
In step 1, the longitudinal length of all metallographic specimens finally processed all should be not less than 30 millimeters, and its longitudinal length is too small likely undetected, and its longitudinal length is long to be ground, polishing inconvenience.
Further, step 2 is: check face to polish on grinding machine metallographic specimen, and the sample polished after clear water rinses, then each abrasive paper for metallograph flour milling being successively placed on 280#-600#--800#--1000# carries out fine grinding; During fine grinding, at every turn when the sand paper that exchange next number is thinner, sample 90-degree rotation should be ground; Again ground sample is washed, buffing machine uses diamond polishing agent carry out polishing, seamless to its surface-brightening; Washed by polished sample, select clean silk as polishing fabric, clear water, as brilliant polish, buffing machine carries out polishing, to remove the foreign matter such as brilliant polish, polishing fabric, the grains of sand that sample adheres to; After using alcohol, hot water washed samples more successively, with blowing by test check ground drying.
The model of abrasive paper for metallograph is more large thinner, generally claims 280# (namely No. 280) to be 280 orders, and number (or order) refers to thickness and the abrasive material quantity per square inch of abrasive material, number higher, and abrasive material is thinner.Order is defined as: per square inch area has 256 eyes, each eye is in an order.
The characterizing method of the solid drawn tube micropore shape defect order of severity, comprises the steps:
1) adopt detection method described in any one of claims 1 to 3 on the inspection face of a metallographic specimen of surveyed solid drawn tube, find two micropore shape defects closest to the inside and outside surface of described metallographic specimen respectively; Do by described two micropore shape defects the parallel lines that two are parallel to sample outside surface respectively, using the maximum spacing of the distance between described two parallel lines as micropore shape defect area on this sample, be denoted as A; The order of severity of the micropore shape defect of this solid drawn tube is characterized, the wherein wall thickness of B=solid drawn tube with the ratio of L=A/B,
2) at least four metallographic specimens surveyed on solid drawn tube repeat steps 1 and obtain corresponding L value, L value maximum in metallographic specimen characterize survey the order of severity of the micropore shape defect of solid drawn tube, this L value is larger, then the micropore shape defect of surveyed solid drawn tube is more serious.
The impact of following two aspects is there is in micropore shape defect on solid drawn tube:
1) on the impact of mechanical properties of pipe, micropore shape defect significantly declines causing the impact flexibility of steel pipe, elongation after fracture and reduction of area, and micropore shape defect is more serious, and the fall of impact flexibility, elongation after fracture and reduction of area is larger;
2) on the impact of steel pipe Long-Term Properties, the heart portion of solid drawn tube also exists micropore shape defect, this fault location stress concentration can be caused high, form tired source or formation of crack, after Long-Time Service, easily fatigue break occurs;
In actual production, judge that whether solid drawn tube is qualified mainly through mechanics properties testing at present, but the conventional mechanical property of steel pipe is as impact flexibility, elongation after fracture etc. detect more loaded down with trivial details, the sense cycle of Long-Term Properties is very long again, Given this, the present invention proposes a kind of characterizing method of the micropore of the solid drawn tube efficiently shape defect order of severity, mechanical property and the usability of steel pipe is indirectly reflected by the order of severity of the micropore shape defect of solid drawn tube, thus whether request for utilization is met to solid drawn tube provide one detection method quite easily, L when solid drawn tube " 3/4 time, then be directly considered as unacceptable product, and without the need to detecting its mechanical property etc. again, as 1/4≤L < 3/4, the test result that can be aided with mechanical property again judges that whether gained solid drawn tube is qualified further.
The characterizing method of the micropore shape defect order of severity that those skilled in the art also can adopt the present invention to propose, in conjunction with the mechanical property of some steel grade steel pipe and the experimental result of usability, sum up the L value of the weldless steel tube of certain specific steel grade and the direct corresponding relation whether between qualified (mechanical property meet the national standard of this steel grade steel pipe and qualified), as the present invention proposes: use for ordinary construction, carry fluid solid drawn tube, the L value characterizing the weldless steel tube pore defect order of severity must meet L < 3/4; For the solid drawn tube applied under high temperature, high pressure or particular surroundings, the L value characterizing the weldless steel tube pore defect order of severity must meet L < 1/2.Once obtain L value in specific steel grade and whether qualified between corresponding relation, so when producing the weldless steel tube of the specific steel grade of new lot, only the detection method of micropore shape defect of the present invention and characterizing method need be first adopted to obtain corresponding L value, can judge that whether this batch of steel grade be qualified, and without the need to detecting the indexs such as its mechanical property again.
Present invention applicant has formulated above-mentioned detection method and characterizing method according to the regularity of distribution of micropore shape defect and to the influence degree in cold drawing steel tube serviceable life, utilize this detection method and characterizing method those skilled in the art can measure the micropore shape defect in solid drawn tube heart portion rapidly and accurately and characterize its order of severity, effectively can solve the On Quality Examining Problems of solid drawn tube, meet the needs of production.
The detection of solid drawn tube micropore shape defect has four key points:
(1) selection of sampling point, due in Cold Drawing Process, the region that pipe wall thickness is the thinnest will be subject to the additional potential stress in other regions, and therefore, micropore shape defect the most easily appears at the thinnest region of solid drawn tube wall thickness; For ensure sampling point representative, the middle sample that must comprise the thinnest region of wall thickness of materialsing;
(2) selection in face is checked, because micropore shape defect is extending longitudinally along steel pipe on solid drawn tube, so, compared with selecting the athwartship plane of sample, select the longitudinal surface of sample can play the effect increasing test samples quantity, improve testing accuracy as inspection face;
(3) preparation of sample, generally after polishing, polishing, sample flour milling is inevitably dispersed with the pockmark of some, and in pockmark, be often dispersed with the foreign matters such as brilliant polish, polishing fabric, the grains of sand, these foreign matters and basal body binding force are comparatively strong, adopt conventional method not easily to clean up, when observing so under the microscope, above-mentioned pockmark easily and micropore shape defect obscure, thus affect checkability and quality, for solving the problem, applicant of the present invention selects clean silk as polishing fabric, clear water is as brilliant polish, first the sample after front step polishing is carried out polishing on buffing machine, remove on sample and the inner brilliant polish adhered to of pockmark, polishing fabric, the foreign matters such as the grains of sand, use alcohol again, hot water wash on sample and pockmark inside grease after, pockmark just obtains and cleans comparatively thoroughly, shinny bottom it when observing under the microscope, and micropore shape defect when observing under the microscope bottom turn black, so just distinguish pockmark and micropore shape defect easily, thus improve detection efficiency, ensure that Detection job.
The characterizing method of the micropore shape defect order of severity, applicant according to the present invention is to the research of micropore shape defect, find that the micropore shape defect on solid drawn tube has following characteristics: 1) regional area of this defect on solid drawn tube is the distribution of longitudinal band shape, and this region mostly is the thinnest region of solid drawn tube wall thickness; 2) longitudinal direction of micropore shape defect and horizontal form are irregular hole, and the size of single micropore is generally between 5um and 30um; 3) micropore shape defect is formed in the middle part of the wall thickness of solid drawn tube, and along with the increase of additional potential stress, the quantity of micropore shape defect increases, and its distributed areas are inside, proximity expansion also; Therefore, the order of severity of this solid drawn tube micropore shape defect can be weighed by the size of micropore shape defect area.
According to the formation mechenism of micropore shape defect, distribution characteristics and the impact on solid drawn tube product usability thereof, the ratio of the maximum spacing of micropore shape defect area and whole wall thickness width as the foundation characterizing the micropore shape defect order of severity, and is found that the characterization value L of the part solid drawn tube product micropore shape defect order of severity exists certain associating with whether qualified its mechanical property is by the present invention.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1 specification is
the detection of 25Mn ordinary construction by solid drawn tube micropore shape defect and the grading of micropore shape defect
Concrete steps are as follows:
A, on solid drawn tube, cut one section of horizontal pipeline section, its longitudinal length is not less than 40 millimeters, transversely get every 90 degree the metallographic specimen that retains inside and outside surface at this pipeline section, get 4 samples altogether, its longitudinal length is not less than 30 millimeters, and sample comprises the sample cut from the thinnest region of solid drawn tube wall thickness;
The longitudinal surface of b, sample is as inspection face;
C, tentatively polished on grinding machine by sample, the sample polished after clear water rinses, then each abrasive paper for metallograph flour milling being successively placed on 280#-600#--800#--1000# carries out fine grinding; At every turn when the sand paper that exchange next number is thinner, sample 90-degree rotation should be ground; Again ground sample is washed, buffing machine uses diamond polishing agent carry out polishing, seamless to its surface-brightening; Washed by polished sample, select clean silk as polishing fabric, clear water, as brilliant polish, buffing machine carries out polishing, to remove the foreign matter such as brilliant polish, polishing fabric, the grains of sand that sample adheres to; After using alcohol, hot water washed samples more successively, with blowing, sample is dried up;
The inspection face of d, above-mentioned four samples of use metallography microscope sem observation, each test check face is found micropore shape defect closest to inside and outside surface respectively, the parallel lines that two are parallel to sample outside surface are done respectively, using the maximum spacing of the distance between above-mentioned two parallel lines as micropore shape defect area on this sample by above-mentioned two micropore shape defects;
Find after observing, the maximum spacing of four sample micropore shape defect areas is respectively 0,0,0,4.2 millimeter, and L is respectively 0,0,0,0.525, the L=0.525 namely in this steel pipe.
Again corresponding Mechanics Performance Testing is carried out to this steel pipe, find that its mechanical property of the product of L < 3/4 is all qualified for ordinary construction solid drawn tube (at least having carried out the matching test between three groups of L values and mechanical property).Therefore find, whether the mechanical property of produced steel pipe is up to standard to utilize method of the present invention directly to verify.For ordinary construction steel pipe, as long as L < 3/4 shows that it is qualified.
Embodiment 2 specification is
the detection of 30CrMo gas cylinder weldless steel tube micropore shape defect and the grading of micropore shape defect
Concrete steps are as follows:
A, on cold drawing steel tube, cut one section of horizontal pipeline section, its longitudinal length is not less than 40 millimeters, transversely get every 90 degree the metallographic specimen that retains inside and outside surface at this pipeline section, get 4 samples altogether, its longitudinal length is not less than 30 millimeters, and sample comprises the sample cut from the thinnest region of solid drawn tube wall thickness;
B, inspection face are the longitudinal check face of sample;
C, tentatively polished on grinding machine by sample, the sample polished after clear water rinses, then each abrasive paper for metallograph flour milling being successively placed on 280#-600#--800#--1000# carries out fine grinding; At every turn when the sand paper that exchange next number is thinner, sample 90-degree rotation should be ground; Again ground sample is washed, buffing machine uses diamond polishing agent carry out polishing, seamless to its surface-brightening; Washed by polished sample, select clean silk as polishing fabric, clear water, as brilliant polish, buffing machine carries out polishing, to remove the foreign matter such as brilliant polish, polishing fabric, the grains of sand that sample adheres to; After using alcohol, hot water washed samples more successively, with blowing, sample is dried up.
The inspection face of d, above-mentioned four samples of use metallography microscope sem observation, test check face is found micropore shape defect closest to inside and outside surface respectively, the parallel lines that two are parallel to sample outside surface are done respectively, using the maximum spacing of the distance between above-mentioned two parallel lines as micropore shape defect area on this sample by above-mentioned micropore shape defect.
Find after observing, the maximum spacing of four sample micropore shape defect areas is respectively 0,0,0,8.2 millimeter, and L is respectively 0,0,0,0.456, the L=0.456 namely in this steel pipe.
Again corresponding Mechanics Performance Testing is carried out to this steel pipe, find that its mechanical property of the product of L < 1/2 is all qualified for gas cylinder weldless steel tube (at least having carried out the matching test between three groups of L values and mechanical property).Therefore find, whether the mechanical property of produced steel pipe is up to standard to utilize method of the present invention directly to verify.For gas cylinder weldless steel tube, as long as L < 1/2 shows that it is qualified.
Embodiment 3, specification are
the detection of 30CrMo gas cylinder weldless steel tube micropore shape defect and the grading of micropore shape defect
Concrete steps are as follows:
A, on cold drawing steel tube, cut one section of horizontal pipeline section, its longitudinal length is not less than 40 millimeters, transversely get every 90 degree the metallographic specimen that retains inside and outside surface at this pipeline section, get 4 samples altogether, its longitudinal length is not less than 30 millimeters, and sample comprises the sample cut from the thinnest region of cold drawing steel tube wall thickness;
B, inspection face are the longitudinal check face of sample;
C, tentatively polished on grinding machine by sample, the sample polished after clear water rinses, then each abrasive paper for metallograph flour milling being successively placed on 280#-600#--800#--1000# carries out fine grinding; At every turn when the sand paper that exchange next number is thinner, sample 90-degree rotation should be ground; Again ground sample is washed, buffing machine uses diamond polishing agent carry out polishing, seamless to its surface-brightening; Washed by polished sample, select clean silk as polishing fabric, clear water, as brilliant polish, buffing machine carries out polishing, to remove the foreign matter such as brilliant polish, polishing fabric, the grains of sand that sample adheres to; After using alcohol, hot water washed samples more successively, with blowing, sample is dried up.
The inspection face of d, above-mentioned four samples of use metallography microscope sem observation, test check face is found micropore shape defect closest to inside and outside surface respectively, the parallel lines that two are parallel to sample outside surface are done respectively, using the maximum spacing of the distance between above-mentioned two parallel lines as micropore shape defect area on this sample by above-mentioned micropore shape defect.
Find after observing, the maximum spacing of four sample micropore shape defect areas is 0,0,2.5,3.6 millimeter, and L is respectively 0,0,0.417,0.6, the L=0.6 namely in this steel pipe.
Again corresponding Mechanics Performance Testing is carried out to this steel pipe, find for gas cylinder weldless steel tube (at least having carried out the matching test between three groups of L values and mechanical property), its mechanical property of the product of L < 1/2 is all qualified, and its L value is 0.6 in the present invention, therefore this batch of steel pipe is defective.
As can be seen here, the present invention can measure solid drawn tube heart portion micropore shape defect rapidly and accurately and characterize its order of severity, certain associating is there is in the desired value of its order of severity with its mechanical property, therefore by detecting micropore shape defect and its order of severity being characterized to the On Quality Examining Problems that just effectively can solve solid drawn tube, meet the needs of production.
Claims (7)
1. the detection method of solid drawn tube micropore shape defect, is characterized in that, described detection method comprises the following steps:
1) on surveyed solid drawn tube, cut one section of horizontal pipeline section, its longitudinal length is not less than 40 millimeters, transversely get every 45 ° ~ 90 ° the metallographic specimen that 4 ~ 8 retain inside and outside surface, and its longitudinal length is not less than 30 millimeters at this pipeline section; A sample cut from the thinnest region of solid drawn tube wall thickness is at least comprised in metallographic specimen;
2) using the longitudinal check face of metallographic specimen as inspection face, the inspection face of each sample is through corase grind, washing and fine grinding, the metallographic specimen inspection face that fine grinding is good is cleaned and on buffing machine, uses brilliant polish to carry out first time polishing, is polished to its surface-brightening seamless; On buffing machine, carry out second time polishing after being cleaned in polished metallographic specimen inspection face again, for the second time polishing using silk as polishing fabric, clear water is as brilliant polish; Last metallographic specimen inspection face is cleaned, after drying up with alcohol, hot water successively;
3) the inspection face of basis of microscopic observation metallographic specimen, the hole that inspection face distributes is micropore shape defect.
2. the detection method of solid drawn tube micropore shape defect according to claim 1, is characterized in that, in step 1, transversely gets every 90 ° the metallographic specimen that 4 retain inside and outside surface at this pipeline section.
3. the detection method of solid drawn tube micropore shape defect according to claim 1 and 2, it is characterized in that, step 2 is: check face to polish on grinding machine metallographic specimen, the sample polished after clear water rinses, then each abrasive paper for metallograph flour milling being successively placed on 280# ~ 600# ~ 800# ~ 1000# carries out fine grinding; During fine grinding, at every turn when the sand paper that exchange next number is thinner, sample 90-degree rotation should be ground; Again ground sample is washed, buffing machine uses diamond polishing agent carry out polishing, seamless to its surface-brightening; Washed by polished sample, select clean silk as polishing fabric, clear water, as brilliant polish, buffing machine carries out polishing, then after using alcohol, hot water washed samples successively, with blowing by test check ground drying.
4. the detection method of the solid drawn tube micropore shape defect according to any one of claims 1 to 3, it is characterized in that, brilliant polish described in step 2 is emery.
5. the detection method of the solid drawn tube micropore shape defect according to any one of Claims 1 to 4, is characterized in that, in step 3, microscopical enlargement factor is 12.5 ~ 100 times.
6. the characterizing method of the solid drawn tube micropore shape defect order of severity, is characterized in that, comprise the steps:
1) adopt detection method described in any one of Claims 1 to 5 on the inspection face of a metallographic specimen of surveyed solid drawn tube, find two micropore shape defects closest to the inside and outside surface of described metallographic specimen respectively; Do by described two micropore shape defects the parallel lines that two are parallel to sample outside surface respectively, using the maximum spacing of the distance between described two parallel lines as micropore shape defect area on this sample, be denoted as A; The order of severity of the micropore shape defect of this solid drawn tube is characterized, the wherein wall thickness of B=solid drawn tube with the ratio of L=A/B;
2) at least four metallographic specimens surveyed on solid drawn tube repeat steps 1 and obtain corresponding L value, L value maximum in metallographic specimen characterize survey the order of severity of the micropore shape defect of solid drawn tube, this L value is larger, then the micropore shape defect of surveyed solid drawn tube is more serious.
7. the characterizing method of the solid drawn tube micropore shape defect order of severity according to claim 6, it is characterized in that, ordinary construction is used, carry fluid solid drawn tube, if L >=3/4, then the micropore shape defect of surveyed weldless steel tube is very serious, survey weldless steel tube and 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 weldless steel tube is very serious, survey weldless steel tube and can not use.
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| CN111006949A (en) * | 2019-12-12 | 2020-04-14 | 河海大学 | Defect quantitative characterization and bursting strength prediction method for defect geomembrane |
| CN112268730A (en) * | 2020-09-07 | 2021-01-26 | 柳州钢铁股份有限公司 | Sampling method for multi-line cutting of reinforcing steel bars |
| CN113109371A (en) * | 2021-04-12 | 2021-07-13 | 宝武杰富意特殊钢有限公司 | Bearing steel micro-pore detection method |
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