CN101349635B - Method for testing reinforcing steel bar center martensite structure - Google Patents
Method for testing reinforcing steel bar center martensite structure Download PDFInfo
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- CN101349635B CN101349635B CN2008100485365A CN200810048536A CN101349635B CN 101349635 B CN101349635 B CN 101349635B CN 2008100485365 A CN2008100485365 A CN 2008100485365A CN 200810048536 A CN200810048536 A CN 200810048536A CN 101349635 B CN101349635 B CN 101349635B
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Abstract
The invention relates to a method for testing martensitic structure in the center of a steel reinforcement, which comprises the following steps: firstly, cutting two segments of longitudinal test samples of steel reinforcements, connecting two steel reinforcement samples with the same diameter in a tangential way to form a mosaic block, secondly, removing the mosaic block from the central portion near the upper portion of the cross section, using the mosaic block whose lower portion is bigger than a semi circle to be a test sample, thirdly, burnishing the cut surface of the test sample till no gap exists between the two segments of the steel reinforcement samples, namely the central portion has no gap, fourthly, corroding the cut surface which is polished by nitric acid alcohol solution, and finally, observing the central portion of the steel reinforcements by a metalloscope, and the central white bright vitta band is the martensitic structure band. The method can rapidly test and evaluate martensitic structure in the center of a steel reinforcement, can effectively solve the quality inspection problem of steel reinforcements, and can satisfy the production requirements.
Description
Technical field
The present invention relates to a kind of quality inspection method of steel, the method for inspection of specifically a kind of reinforcing bar center martensitic stucture.
Background technology
High-carbon hypereutectoid steel gren rod (also claiming reinforcing bar) produces martensitic stucture at the center because of segregation in process of production easily, martensitic stucture is zonal arrangement when serious, cause reinforcing bar when drawing or use, to rupture easily, thereby it is very necessary that reinforcing bar center martensitic stucture is tested.
The check of center martensitic stucture has two key points: the preparation of (1) longitudinal test piece, check wire rod center martensite must adopt longitudinal test piece, but the center of determining longitudinal test piece is difficult, if the sample position not at the center or off-center far away, then can't observe the center martensitic stucture.Now general method for making sample be with a reinforcing bar with the good size of dipstick metering after, cut a part of longitudinal test piece in advance near the center, corrosion of limit edging and observation then, come and go the position that repeatedly could determine the center martensitic stucture, sample preparation efficient is very low, causes very longly influence production proving time.(2) grading of center martensitic stucture is carried out classification and evaluation if misalign the order of severity of heart martensitic stucture, just can't judge its order of severity, also can't pass judgment on the quality of wire rod, does not still have the ranking method of center martensitic stucture at present.Therefore invent the check and the ranking method of a kind of reinforcing bar center martensitic stucture, be highly profitable to meet the needs of production.
Summary of the invention
Purpose of the present invention is exactly the defective at prior art, and the method for inspection of a kind of reinforcing bar center martensitic stucture is provided, and it can check the distribution situation of reinforcing bar center martensitic stucture rapidly and accurately.
Technical scheme of the present invention is achieved in that it may further comprise the steps:
A. cut two sections reinforcing bar longitudinal test pieces, with the tangent mosaic block that links together into of the reinforcing bar sample of two same diameters;
B. with mosaic block slightly top excision from the cross-section center position, the bottom greater than semicircular mosaic block as test sample;
C. the cut surface with test sample polishes, and does not have the slit to be the center between two sections reinforcing bar samples;
D. corrode with the cut surface of nital polishing;
E. observe the reinforcing bar centre with metaloscope then, middle core white light tone band is the martensitic stucture band.
Wherein said nital is to be mixed by nitric acid and the alcohol volume ratio by 3: 97.
With reference to the grading principle of this method, center martensitic stucture band is graded
Table 1
| Rank | Tissue signature's (enlargement factor 100 *) |
| 0 | No martensite band |
| 1 | Fine strip shape martensite is interrupted shape and distributes, and accounts for 1/2nd of field number |
| 2 | Fine strip shape martensite accounts for 2/3rds of field number |
| 3 | Fine strip shape martensite runs through whole visual field |
| 4 | Thick strip martensite runs through whole visual field |
The present invention can fast measuring reinforcing bar center martensitic stucture and it is evaluated, and can effectively solve the quality testing problem of reinforcing bar, meets the needs of production.
Description of drawings
Fig. 1-5 detects for martensitic stucture band of the present invention and grading figure; Fig. 1-Fig. 5 is respectively 0--4 level grading figure.
Fig. 6 is the cutting synoptic diagram of test sample of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is further described:
The present invention includes following steps:
A. cut the long reinforcing bar longitudinal test piece of two sections 20mm, with the tangent mosaic block that links together into of the reinforcing bar sample of two same diameters;
B. with mosaic block slightly top excision from the cross-section center position, the bottom greater than semicircular mosaic block as test sample; As shown in Figure 6.
C. the cut surface with test sample polishes, and does not have the slit to be the center between a, the b of two sections reinforcing bar samples point; As shown in Figure 6.
D. corrode with the cut surface of nital polishing; Wherein said nital is to be mixed by nitric acid and the alcohol volume ratio by 3: 97.
E. observe the reinforcing bar centre with metaloscope then, middle core white light tone band is the martensitic stucture band.Shown in Fig. 1-5.
Can grade to reinforcing bar center martensitic stucture easily according to figure and table 1.The inventive method can accurately prepare wire rod center martensite band, guarantees that the martensite band can omission, can judge the order of severity of center martensite band by the grading standard of this method.
Claims (2)
1. the method for inspection of a reinforcing bar center martensitic stucture, it may further comprise the steps:
A. reinforcing bar is radially cut into two sections as sample, with the tangent mosaic block that links together into of the reinforcing bar sample of two same diameters;
B. with mosaic block from the cross-section center position slightly upper shaft to excision, the bottom greater than semicircular mosaic block as test sample;
C. the axial cut surface with test sample polishes, and does not have the slit to be the bar cross section center between two sections reinforcing bar samples;
D. corrode with the axial cut surface of nital polishing;
E. observe the centre of the axial cut surface of reinforcing bar then with metaloscope, middle core white light tone band is the martensitic stucture band.
2. the method for inspection of a kind of reinforcing bar according to claim 1 center martensitic stucture, wherein said nital are to be mixed by nitric acid and the alcohol volume ratio by 3: 97.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100485365A CN101349635B (en) | 2008-07-24 | 2008-07-24 | Method for testing reinforcing steel bar center martensite structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100485365A CN101349635B (en) | 2008-07-24 | 2008-07-24 | Method for testing reinforcing steel bar center martensite structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101349635A CN101349635A (en) | 2009-01-21 |
| CN101349635B true CN101349635B (en) | 2010-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100485365A Expired - Fee Related CN101349635B (en) | 2008-07-24 | 2008-07-24 | Method for testing reinforcing steel bar center martensite structure |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102954976A (en) * | 2011-08-19 | 2013-03-06 | 鞍钢股份有限公司 | Method for quantitatively examining center segregations of wire rod |
| CN105092437B (en) * | 2015-09-22 | 2018-05-01 | 中国第一重型机械股份公司 | Ultra supercritical martensite heat resisting cast steel original austenite grains degree display methods |
| CN105424702A (en) * | 2015-12-10 | 2016-03-23 | 东南大学 | Method for dynamically analyzing cracking failure of carbides in high speed steels |
| CN105466748B (en) * | 2015-12-31 | 2018-12-25 | 中铝西南铝冷连轧板带有限公司 | PS plate primary surface jail-bar detection approach |
| CN110567885B (en) * | 2019-08-28 | 2021-12-10 | 中国航发成都发动机有限公司 | Inspection method based on surface grinding burn of quenched steel part |
| CN112816277A (en) * | 2020-11-30 | 2021-05-18 | 中国第一汽车股份有限公司 | Method for evaluating internal quality of core region of hot-rolled round bar steel |
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2008
- 2008-07-24 CN CN2008100485365A patent/CN101349635B/en not_active Expired - Fee Related
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| CN101349635A (en) | 2009-01-21 |
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Granted publication date: 20100811 Termination date: 20160724 |