CN110174402A - A method of distinguishing hot-rolled steel red oxidization skin and red corrosion product - Google Patents
A method of distinguishing hot-rolled steel red oxidization skin and red corrosion product Download PDFInfo
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- CN110174402A CN110174402A CN201910400868.3A CN201910400868A CN110174402A CN 110174402 A CN110174402 A CN 110174402A CN 201910400868 A CN201910400868 A CN 201910400868A CN 110174402 A CN110174402 A CN 110174402A
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- polarizer
- rolled steel
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- 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
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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
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- 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
- G01N2001/2873—Cutting or cleaving
Abstract
The invention discloses a kind of methods for distinguishing hot-rolled steel red oxidization skin and red corrosion product, include the following steps: sample preparation: having red hot-rolled steel to be cut into individual sample on surface；Target area is searched using directional light: being observed using the microscope with the polarizer and analyzer, extract the polarizer when observation out, stop using the polarizer and analyzer, microscope is switched into light field imaging pattern, observe specimen surface or section, adjusting microscope imaging mode is colour, and adjustment amplification factor finds target area；Using polarised light object observing region: the polarizer is pushed into microscope bottom, the polarizer and analyzer are enabled, microscope is switched into polaroid imaging mode, the microscope polarizer is adjusted and analyzer is orthogonal state, using crossed polarized light photographic subjects region, polarisation picture is obtained；As a result classify.This method can quickly distinguish the type of surface red material, and the testing time is short.
Description
Technical field
The present invention relates to steel analysis method, in particular to a kind of differentiation hot-rolled steel red oxidization skin and red corrosion
The method of product.
Background technique
Hot-rolled steel can generate corrosion in shipping or storage process, and wherein surface scale has matrix corrosion resistance larger
Influence, this and oxide skin itself microstructure and chemical substance composition etc. it is closely related.Studies have shown that oxide skin object mutually by
It is interior to be followed successively by FeO, Fe to outer3O4And Fe2O3, color state is blue, black, red.If oxide skin is the red of high temperature generation
Color Fe2O3Oxide skin, while hot-rolled steel contacts or forms in wet air placement process yellow or red with production water
The corrosion product of color, then be not easily distinguishable red material Producing reason.Hot-rolled steel when leaving the factory, generally there is stringent surface quality
It is required that being usually not intended to see rubescent oxide skin.In addition, studies have shown that surface is easy to generate the hot-rolled steel of corrosion product
Corrosion resistance of the oxide skin in storage and transportation environment is very poor.For the surface quality for improving hot-rolled steel, improve with oxide skin
Hot-rolled steel corrosion resistance in storage and transportation environment, needs to control the structure type of oxide skin.Therefore it is red to distinguish hot-rolled steel
Color substance is that oxide skin or corrosion product are meaningful for the structure for controlling oxide skin.Currently, mostly using X-ray diffraction method
Test section dividend color substance is oxide skin or corrosion product, but can be damaged to original sample when sample preparation, not can be carried out
In-situ study.And sample preparation is cumbersome, and test analysis process is longer.
Summary of the invention
Goal of the invention: it is an object of the present invention to provide that can carry out, in-situ study, the testing time is short, differentiation easy to operate is hot
The method of steel rolling red oxidization skin and red corrosion product.
To solve technical solution: the present invention provides a kind of method for distinguishing hot-rolled steel red oxidization skin and red corrosion product,
Include the following steps:
(1) sample preparation: there is red hot-rolled steel to be cut into individual sample on surface, keep specimen surface not damaged；
(2) target area is searched using directional light: sample is seen using the microscope with the polarizer and analyzer
It examines, when observation extracts the polarizer out, stops using the polarizer and analyzer, microscope is switched to light field imaging pattern, using flat
Row light observes specimen surface or section, then adjusts microscope imaging mode as colour, adjusts amplification factor as needed and finds mesh
Mark region；
(3) it uses polarised light object observing region: the polarizer being pushed into microscope bottom, enables the polarizer and analyzer,
Microscope is switched into polaroid imaging mode, the microscope polarizer is adjusted and analyzer is orthogonal state, using crossed polarized light
Photographic subjects region obtains polarisation picture；
(4) classify: distinguishing oxide skin and corrosion product according to the different colours of picture.
Further, step (1) hot-rolled steel is cut using gas flame cuttiug or machine cuts.Step (1) heat
Steel rolling is cut into length and is less than the sample of 100mm, thickness less than 30mm less than 100mm, width.Step (2) amplification factor
It is 100 times or 200 times.The microscope is metallographic microscope.
The method of the present invention uses reflecting type polarizing microscope, is because petrographic microscope identifying a certain substance is unirefringence
(isotropism) or birefringence (anisotropy) are very useful, and steel substrate is unable to light transmission, thus using it is reflective without
It is transmission-type petrographic microscope.The oxide skin that hot-rolled steel reacts generation at high temperature is usually amorphous, has isotropism,
It is in extinction state under orthogonal polarizing microscope, and the outer substance of corrosion product is generally the FeOOH of crystalline state, in cross-polarized light shape
In yellow or the light state of red under state.Although high temperature generates red oxidization skin and is difficult to differentiate with corrosion product naked eyes, inclined
It can but be distinguished under light microscope.Using orthoscopic observation sample, fast and easy finds target area.General oxide skin is being put
It is 100 times big~200 times can see optimal visual field effect, so amplification factor generally selects 100 times~200 times.
The utility model has the advantages that the present invention can quickly distinguish the type of hot-rolled steel surface red material, surface quality is found out in time and is gone out
The reason of problem, very valuable to the surface quality for improving hot-rolled steel, reduce production product sentences useless rate, brings direct economy
Benefit；The method of the present invention is easy to operate, and the testing time is short, completes a sample testing and probably needs 3~20 minutes.
Detailed description of the invention
Fig. 1 is X65 hot rolling steel surface polarisation picture；
Fig. 2 is AH36 hot-rolled steel section polarisation picture.
Specific embodiment
Embodiment 1
The X65 Pipeline Steel Plate produced using hot rolling cooling controlling and rolling controlling process, steel plate thickness 16mm, steel plate rubicundity.It utilizes
ZEISS Axio Imager M2m metallographic microscope equipped with the polarizer and analyzer distinguishes red material class using this method
Type includes the following steps:
(1) sample preparation.By the rubescent X65 steel in surface using the sample for being mechanically cut into 30 × 30 × 16mm, keep sample former
Beginning surface state is not damaged.
(2) orthoscopic observation sample is used.The polarizer and analyzer are deactivated, extracts the polarizer out, switches to light field imaging mould
Formula, using microscope orthoscopic observation specimen surface, adjusting microscope imaging mode is colour, adjusts amplification factor as needed
It is 100 times, finds the target area to be observed；
(3) sample is observed using polarised light.Using the polarizer and analyzer, the polarizer is pushed into bottom, switches to polarisation
Imaging pattern adjusts the microscope polarizer and analyzer and is orthogonal state, using the picture in crossed polarized light photographic subjects region,
As shown in Figure 1；
(4) judge red material type.The color for analyzing the above surface mass of polarisation picture steel matrix, if in polarisation picture
Being shown as dead color is oxide skin, is displayed in red in polarisation picture or yellow is corrosion product.
As shown in Figure 1, which is collectively constituted by oxide skin and corrosion product, and rubescent position is (relatively bright in figure
Color) it is corrosion product, dark-coloured area is high-temperature red oxide skin.
Embodiment 2
The AH36 ship steel produced using hot rolling technology, steel plate thickness 16mm are placed 60 days in warehouse.Using being furnished with
The ZEISS Axio Imager M2m metallographic microscope of inclined device and analyzer distinguishes red material type using this method, including
Following steps:
(1) sample preparation.The rubescent X65 steel surface in surface is sealed with epoxy resin, keep sample initial surface state not by
It destroys, using the sample for being mechanically cut into 30 × 30 × 16mm.
(2) orthoscopic observation sample is used.The polarizer and analyzer are deactivated, extracts the polarizer out, switches to light field imaging mould
Formula, using microscope orthoscopic observation specimen surface, adjusting microscope imaging mode is colour, adjusts amplification factor as needed
It is 200 times, finds the target area to be observed；
(3) sample is observed using polarised light.Using the polarizer and analyzer, the polarizer is pushed into bottom, switches to polarisation
Imaging pattern adjusts the microscope polarizer and analyzer and is orthogonal state, using the picture in crossed polarized light photographic subjects region,
As shown in Fig. 2, wherein picture top blue region is epoxy resin, centre is oxide skin (relatively dark-colored) and corrosion product (phase
To light tone), lower part black region is steel matrix；
(4) judge red material type.The color for analyzing the above surface mass of polarisation picture steel matrix, if in polarisation picture
Being shown as dead color is oxide skin, is displayed in red in polarisation picture or yellow is corrosion product.
As shown in Figure 2, there is corrosion product on the surface of oxide skin and steel matrix.
Claims (5)
1. a kind of method for distinguishing hot-rolled steel red oxidization skin and red corrosion product, characterized by the following steps:
(1) sample preparation: there is red hot-rolled steel to be cut into individual sample on surface, keep specimen surface not damaged；
(2) target area is searched using directional light: sample is observed using the microscope with the polarizer and analyzer, seen
It extracts the polarizer when examining out, stops using the polarizer and analyzer, microscope is switched into light field imaging pattern, is seen using directional light
Specimen surface or section are examined, then adjusts microscope imaging mode as colour, amplification factor is adjusted as needed and finds target area；
(3) it uses polarised light object observing region: the polarizer being pushed into microscope bottom, the polarizer and analyzer is enabled, will show
Micro mirror switches to polaroid imaging mode, adjusts the microscope polarizer and analyzer is orthogonal state, shot using crossed polarized light
Target area obtains polarisation picture；
(4) classify: distinguishing oxide skin and corrosion product according to the different colours of picture.
2. the method according to claim 1 for distinguishing hot-rolled steel red oxidization skin and red corrosion product, it is characterised in that:
Step (1) hot-rolled steel is cut using gas flame cuttiug or machine cuts.
3. the method according to claim 1 for distinguishing hot-rolled steel red oxidization skin and red corrosion product, it is characterised in that:
Step (1) hot-rolled steel is cut into length and is less than the sample of 100mm, thickness less than 30mm less than 100mm, width.
4. the method according to claim 1 for distinguishing hot-rolled steel red oxidization skin and red corrosion product, it is characterised in that:
Step (2) amplification factor is 100 times or 200 times.
5. the method according to claim 1 for distinguishing hot-rolled steel red oxidization skin and red corrosion product, it is characterised in that:
The microscope is metallographic microscope.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910400868.3A CN110174402B (en) | 2019-05-14 | 2019-05-14 | Method for distinguishing red oxide skin and red corrosion product of hot rolled steel |
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| CN201910400868.3A CN110174402B (en) | 2019-05-14 | 2019-05-14 | Method for distinguishing red oxide skin and red corrosion product of hot rolled steel |
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| CN110174402A true CN110174402A (en) | 2019-08-27 |
| CN110174402B CN110174402B (en) | 2021-07-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442961A (en) * | 2020-04-25 | 2020-07-24 | 广东石油化工学院 | Method for analyzing distribution and transportation route of xanthone compounds in pummelo peel |
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| JP2005342770A (en) * | 2004-06-04 | 2005-12-15 | Sumitomo Metal Ind Ltd | Method for manufacturing hot-rolled steel sheet |
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2019
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| CN101012528A (en) * | 2007-01-25 | 2007-08-08 | 鞍钢股份有限公司 | Surface iron scale control method for middle sheet billet continuous casting and rolling steel plate |
| CN103406368A (en) * | 2013-08-16 | 2013-11-27 | 武汉钢铁(集团)公司 | Rolling method for optimizing surface quality of hot rolled steel plate |
| CN103769424A (en) * | 2014-01-08 | 2014-05-07 | 南京钢铁股份有限公司 | Method for controlling red oxide scale on surface of steckel mill steel plate |
| JP2017200701A (en) * | 2016-05-06 | 2017-11-09 | 株式会社神戸製鋼所 | Manufacturing method of steel material |
| CN106053471A (en) * | 2016-08-04 | 2016-10-26 | 南京钢铁股份有限公司 | Method for showing austenite crystal boundary of micro-alloyed steel in vacuum hot-corrosion condition |
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| CN111442961A (en) * | 2020-04-25 | 2020-07-24 | 广东石油化工学院 | Method for analyzing distribution and transportation route of xanthone compounds in pummelo peel |
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