CN112268902A - Detection method of cord steel GBC - Google Patents
Detection method of cord steel GBC Download PDFInfo
- Publication number
- CN112268902A CN112268902A CN202011062006.3A CN202011062006A CN112268902A CN 112268902 A CN112268902 A CN 112268902A CN 202011062006 A CN202011062006 A CN 202011062006A CN 112268902 A CN112268902 A CN 112268902A
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- Prior art keywords
- gbc
- sample
- detecting
- cord steel
- polishing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000005498 polishing Methods 0.000 claims abstract description 18
- 238000005204 segregation Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005260 corrosion Methods 0.000 claims abstract 2
- 230000007797 corrosion Effects 0.000 claims abstract 2
- 238000005530 etching Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- ZVUUCUFDAHKLKT-UHFFFAOYSA-M sodium;2,4,6-trinitrophenolate Chemical group [Na+].[O-]C1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O ZVUUCUFDAHKLKT-UHFFFAOYSA-M 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 244000137852 Petrea volubilis Species 0.000 claims description 2
- 239000002436 steel type Substances 0.000 description 3
- 238000003556 assay Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a method for detecting a cord steel GBC, which sequentially comprises a sample grinding step, a sample polishing step, a sample corrosion step and a sample detection step. The sample detection step includes finding the segregation point at a magnification of 100 times by the microscope, then switching the microscope to 500 times, detecting the GBC in the segregation point region and grading. The method is simple and quick, solves the problems that the cord wire GBC is difficult to detect and the detection time is long, and provides a method for accurately and quickly detecting the cord wire steel GBC.
Description
Technical Field
The invention relates to a rapid inspection method of cord steel GBC, belonging to the technical field of steel detection.
Background
The steel cord is mainly applied to the meridian of a tire, not only has high strength, but also needs to be drawn to be very thin, needs to be drawn to be 0.15-0.38 mm from phi 5.5mm, then is stranded, can draw 2000km of 1 ton of steel for the tire steel wire with the diameter of 0.15-0.30 mm, and does not allow the end to be broken for 2 times. The metallographic structure of the cord steel is mainly sorbite (fine pearlite), and the GBC of the reticular cementite in the cord steel wire rod is strictly controlled to prevent the fracture in the subsequent drawing or stranding process. The GBC area of the cord steel is small, the detection speed of the conventional full-field detection method is low, and the detection is easy to miss.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the detection method for simply, quickly and accurately detecting the GBC of the cord steel is provided.
The technical scheme is as follows: and (3) grinding the sample, polishing, corroding and detecting the sample.
The invention further defines the technical scheme as follows:
further, in the grinding step, the sample is ground to be flat by 180#, 600#, 1200# water sand paper along the cross section in sequence.
Further, after the polishing step is finished, polishing is carried out by adopting a polishing agent of 0.25-0.5 um.
Further, in the etching step, the sodium picrate solution is used for etching for 30-35 min.
Further, the detection step is that the segregation point is found under the microscope at a magnification of 100, then the microscope is switched to 500, and the GBC is detected in the segregation point area and is graded.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the method is simple and easy to implement, is less interfered by human factors, is quicker and more accurate than the traditional inspection method of the cord steel GBC, and provides powerful guarantee for the quality control and product judgment of the cord steel.
Drawings
FIGS. 1-3 are gold phase diagrams of GBC assays of examples 1-3 of the invention.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
Example 1
Example 1 the steel type is cord steel, the cross section of the sample is taken as an observation surface, and the sample is treated according to the following steps:
(1) and (3) grinding the cross section of the sample by 180#, 600# and 1200# water sandpaper in sequence.
(2) And after the polishing step is finished, polishing by adopting a 0.5um polishing agent.
(3) The sample was etched with sodium picrate solution for 33 min. The segregation areas appear black after etching.
(4) And (4) detecting the sample, finding a segregation point in a central area of the sample under the condition that the microscope is 100 times, switching the microscope to be 500 times, detecting GBC in a segregation point area, and grading.
Example 2
Example 2 the steel type is cord steel, the cross section of the sample is taken as an observation surface, and the sample is treated according to the following steps: (1) and (3) grinding the cross section of the sample by 180#, 600# and 1200# water sandpaper in sequence.
(2) And after the polishing step is finished, polishing by adopting a 0.25um polishing agent.
(3) And corroding the sample with a sodium picrate solution for 30 min. The segregation areas appear black after etching.
(4) And (4) detecting the sample, finding a segregation point in a central area of the sample under the condition that the microscope is 100 times, switching the microscope to be 500 times, detecting GBC in a segregation point area, and grading.
Example 3
Example 3 the steel type is cord steel, the cross section of the sample is taken as an observation surface, and the sample is treated according to the following steps: (1) and (3) grinding the cross section of the sample by 180#, 600# and 1200# water sandpaper in sequence.
(2) And after the polishing step is finished, polishing by adopting a 0.5um polishing agent.
(3) The sample was corroded and corroded with sodium picrate solution for 35 min. The segregation areas appear black after etching.
(4) And (4) detecting the sample, finding a segregation point in a central area of the sample under the condition that the microscope is 100 times, switching the microscope to be 500 times, detecting GBC in a segregation point area, and grading.
TABLE 1 GBC assay results of examples 1 to 3
| Thickness of | Example 1 | Example 2 | Example 3 | |
| Detecting items | GBC | GBC | GBC | |
| Require that | 5.5 | ≤24 | ≤24 | ≤24 |
| The result of the detection | 5.5 | 4 | 4 | 32 |
As can be seen from the data in the table and the attached drawings, by applying the detection method disclosed by the invention, the metallographic structure of the sample is clear, the GBC of the cord steel can be quickly detected, and the quality condition of the material can be accurately reflected.
Claims (5)
1. A method for detecting a cord steel GBC comprises a sample grinding step, a sample polishing step, a sample corrosion step and a sample detection step in sequence, and is characterized in that the sample detection step comprises the following steps: in the central area of the sample, the microscope finds the segregation point at 100 times, then the microscope is switched to 500 times, and the GBC is detected and graded in the segregation point area.
2. The method for detecting a GBC of a cord steel according to claim 1, wherein: in the grinding step, the sample is ground to be flat by 180#, 600#, 1200# water sand paper along the cross section in sequence.
3. The method for detecting GBC of cord steel according to claim 2, wherein: after the polishing step is completed, polishing is performed with a 0.25-0.5 μm polishing agent.
4. The method for detecting a GBC of a cord steel according to claim 1, wherein: in the etching step, the etchant is a sodium picrate solution.
5. The method for detecting a GBC of a cord steel according to claim 1, wherein: in the etching step, the etching time is 30-35min, or until the segregation point can be clearly seen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011062006.3A CN112268902A (en) | 2020-09-30 | 2020-09-30 | Detection method of cord steel GBC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011062006.3A CN112268902A (en) | 2020-09-30 | 2020-09-30 | Detection method of cord steel GBC |
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| Publication Number | Publication Date |
|---|---|
| CN112268902A true CN112268902A (en) | 2021-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011062006.3A Pending CN112268902A (en) | 2020-09-30 | 2020-09-30 | Detection method of cord steel GBC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112268902A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102374990A (en) * | 2010-08-26 | 2012-03-14 | 天津荣程联合钢铁集团有限公司 | Network carbide rating method of wire rod for prestressed steel stranded wire |
| CN103308514A (en) * | 2013-05-09 | 2013-09-18 | 中原特钢股份有限公司 | Method for detecting carbide nonuniformity of tool steel by annealed room-temperature etching method |
| CN104133083A (en) * | 2014-07-09 | 2014-11-05 | 河冶科技股份有限公司 | Method for quantitative detection of MC carbide in high-V high-speed steel |
-
2020
- 2020-09-30 CN CN202011062006.3A patent/CN112268902A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102374990A (en) * | 2010-08-26 | 2012-03-14 | 天津荣程联合钢铁集团有限公司 | Network carbide rating method of wire rod for prestressed steel stranded wire |
| CN103308514A (en) * | 2013-05-09 | 2013-09-18 | 中原特钢股份有限公司 | Method for detecting carbide nonuniformity of tool steel by annealed room-temperature etching method |
| CN104133083A (en) * | 2014-07-09 | 2014-11-05 | 河冶科技股份有限公司 | Method for quantitative detection of MC carbide in high-V high-speed steel |
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Application publication date: 20210126 |